0000045876-24-000010 | 10-K | XBRL Viewer

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Debt and Credit Agreements - Narrative (Details) $ in Thousands		1 Months Ended		3 Months Ended		12 Months Ended
	Aug. 29, 2022	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2024	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2024	Jun. 30, 2023 USD ($)
Line of Credit Facility [Line Items]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities							$ 101,500	$ 73,400	$ 60,900
Loss on early extinguishment of debt							0	2,254	$ (2,668)
Short-term borrowings		$ 7,751					$ 14,871	$ 7,751
Short-term Debt, Weighted Average Interest Rate, at Point in Time		4.65%					6.10%	4.65%
Senior Unsecured Notes 5.75%, Due 2027 [Member] \| Senior Notes
Line of Credit Facility [Line Items]
Debt Instrument, Repurchased Face Amount											$ 25,000
Debt Instrument, Interest Rate, Stated Percentage											5.75%
Debt Instrument, Repurchase Amount											$ 22,400
Loss on early extinguishment of debt			$ 2,300
Write off of Deferred Debt Issuance Cost			$ 300
Senior Secured Credit Facility
Line of Credit Facility [Line Items]
Net Debt to Consolidated Adjusted EBITDA Ratio							4.14
Consolidated Adjusted EBITDA To Consolidated Interest Charges Ratio							3.03
Increase to net debt							$ 439,800
Decrease to adjusted EBITDA							29,800
Increase to interest expense							$ 10,800
Revolving Credit Facility
Line of Credit Facility [Line Items]
Net debt to consolidated adjusted EBITDA ratio covenant											5.50
Net debt to consolidated adjusted EBITDA ratio covenant, quarterly increase (decrease)							0.25
Debt Instrument, Basis Spread On Variable Rate, Floor							0.00%
Revolving Credit Facility \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate							0.114%
Revolving Credit Facility \| Minimum
Line of Credit Facility [Line Items]
Threshold net debt to consolidated adjusted EBITDA ratio covenant							3.0
Revolving Credit Facility \| Minimum \| Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate							0.50%
Revolving Credit Facility \| Minimum \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate							1.614%
Revolving Credit Facility \| Maximum
Line of Credit Facility [Line Items]
Net debt to consolidated adjusted EBITDA ratio covenant							5.50
Threshold net debt to consolidated adjusted EBITDA ratio covenant							4.00
Revolving Credit Facility \| Maximum \| Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate							1.75%
Revolving Credit Facility \| Maximum \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate							2.864%
Revolving Credit Facility \| Senior Secured Credit Facility \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Floor Interest Rate	0.00%
Revolving Credit Facility \| Senior Secured Credit Facility \| Line of Credit [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.114%
Revolving Credit Facility \| Senior Secured Credit Facility \| Line of Credit [Member] \| Minimum \| Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Revolving Credit Facility \| Senior Secured Credit Facility \| Line of Credit [Member] \| Minimum \| London Interbank Offered Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.50%
Revolving Credit Facility \| Senior Secured Credit Facility \| Line of Credit [Member] \| Minimum \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate		0.614%
Revolving Credit Facility \| Senior Secured Credit Facility \| Line of Credit [Member] \| Maximum \| Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.75%
Revolving Credit Facility \| Senior Secured Credit Facility \| Line of Credit [Member] \| Maximum \| London Interbank Offered Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate	2.75%
Revolving Credit Facility \| Senior Secured Credit Facility \| Line of Credit [Member] \| Maximum \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate		2.864%
Revolving Credit Facility \| New Term Loan \| Line of Credit [Member] \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate		2.364%
Revolving Credit Facility \| Forecast
Line of Credit Facility [Line Items]
Net debt to consolidated adjusted EBITDA ratio covenant					4.00	4.00
Net debt to consolidated adjusted EBITDA ratio covenant, quarterly increase (decrease)					0.25
Net debt to consolidated adjusted EBITDA ratio covenant, increase (decrease) related to divesture of business										0.50
Threshold Consolidated Adjusted EBITDA To Consolidated Interest Charges Ratio Covenant				3.00		2.75
Revolving Credit Facility \| Forecast \| Senior Secured Credit Facility \| Line of Credit [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Consolidated Interest Charge To Consolidated Adjusted EBITDA						3.00
Account Receivable Securitization Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity											$ 150,000

Capital Stock (Details 3) - shares shares in Thousands	12 Months Ended
Capital Stock (Details 3) - shares shares in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Restricted stock units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	1,219	672	0
Stock Appreciation Rights (SARs)
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	2,303	2,092	826
Performance Shares [Member]
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	1,341	1,040	865

Summary of Significant Accounting Policies (Details 2) - Self-insurance - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Decrease in pre-tax insurance expense due to retrospective insurance reserve adjustments from continuing operations	$ (0.7)	$ 1.0	$ 0.2
Liabilities for asserted and unasserted claims	31.5	32.4
Liabilities covered by insurance carriers	$ 6.5	$ 4.0

Summary of Significant Accounting Policies	12 Months Ended
Summary of Significant Accounting Policies	Dec. 31, 2023
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Consolidation The consolidated financial statements include all accounts of Enviri Corporation (the "Company"), all entities in which the Company has a controlling voting interest and variable interest entities required to be consolidated in accordance with U.S. GAAP. Intercompany accounts and transactions have been eliminated among consolidated entities. The Company's management has evaluated all activity of the Company and concluded that subsequent events are properly reflected in the Company's consolidated financial statements and the accompanying notes as required by U.S. GAAP. Liquidity The Company's cash flow forecasts, combined with existing cash and cash equivalents and borrowings available under the Senior Secured Credit Facilities, indicate sufficient liquidity to fund the Company's operations for at least the next twelve months. As such, the Company's consolidated financial statements have been prepared on the basis that it will continue as a going concern for a period extending beyond twelve months from the date the consolidated financial statements are issued. This assessment includes the expected ability to meet required financial covenants and the continued ability to draw down on the Senior Secured Credit Facilities (see Note 8, Debt and Credit Agreements). Out-of-Period Adjustments During 2023, the Company recorded out-of-period adjustments that had the net effect of increasing loss from discontinued businesses on the Company’s Consolidated Statements of Operations by $5.1 million. The adjustments are primarily the result of identified errors relating to value added taxes and inventory. The Company assessed the individual and aggregate impact of these adjustments on the current year and all prior periods and determined that the cumulative effect of the adjustments was not material to the full-year 2023 results, and did not result in a material misstatement to any previously issued annual or quarterly financial statements. Consequently, the Company recorded the adjustment during 2023 and has not revised any previously issued amounts in the Company’s Consolidated Financial Statements. Cash and Cash Equivalents Cash and cash equivalents include cash on hand, demand deposits and short-term investments that are highly liquid in nature and have an original maturity of three months or less. Restricted Cash The Company had restricted cash of $3.4 million and $3.8 million at December 31, 2023 and 2022, respectively, and the restrictions are primarily related to collateral provided for certain guarantees of the Company’s performance. Accounts Receivable Accounts receivable are stated at net realizable value, which represents the face value of the receivable, less an allowance for expected credit losses. The allowance for expected credit losses is maintained for expected lifetime losses resulting from the inability of customers to make required payments. The Company’s expected credit loss allowance methodology for accounts receivable is developed using historical collection experience, current and future economic and market conditions and a review of the current status of customers' trade accounts receivables. When required, the Company adjusts the loss-rate methodology to account for current conditions and reasonable and supportable expectations of future economic and market conditions. The Company generally assesses future economic conditions for a period which corresponds with the contractual life of its accounts receivable. Additionally, specific allowance amounts are established to record the appropriate provision for customers that have a higher probability of default. Accounts Receivable Securitization Facility Under the AR Facility, the Company and its subsidiaries continuously sell their trade receivables as they are originated to the Company’s SPE. The Company controls and, therefore, consolidates the SPE in its consolidated financial statements. The SPE transfers ownership and control of qualifying receivables to the banking counterparty to the AR Facility up to the maximum purchase commitment. The Company and its related subsidiaries have no continuing involvement in the transferred accounts receivable, other than collection and administrative responsibilities, and, once sold, the receivables are no longer available to satisfy creditors of the Company or the related subsidiaries. The Company accounts for receivables sold to the banking counterparty as a sale of financial assets and derecognizes the trade receivables from the Company's Consolidated Balance Sheets. Fees incurred for the AR Facility are deferred and are expensed over the term of the agreement. Unamortized costs are included in Other assets in the Company's Consolidated Balance Sheets and the related recognized expense is recorded in Facility fees and debt-related income (expense) on the Consolidated Statements of Operations. Inventories Inventories are accounted for using the average cost, first-in, first-out ("FIFO") or last-in, first-out ("LIFO") method. Inventory accounted for under the average cost and FIFO methods are stated at the lower of cost or net realizable value. Inventory accounted for under the LIFO method is stated at the lower of cost or market. See Note 5, Inventories for additional information. Property, Plant and Equipment Property, plant and equipment ("PP&E") is recorded at cost and depreciated over the estimated useful lives of the assets using, principally, the straight-line method. When PP&E is retired from service, the cost of the retirement is charged to the allowance for depreciation to the extent of the accumulated depreciation and the balance is charged to income. Long-lived assets to be disposed of by sale are not depreciated while they are classified as held-for-sale. Leases The Company leases certain property and equipment under noncancelable lease agreements. The Company determines if a contract or arrangement contains a lease at inception. All leases are evaluated and classified as either an operating or finance lease. A lease is classified as a finance lease if any of the following criteria are met: (i) ownership of the underlying asset transfers to the Company by the end of the lease term; (ii) the lease contains an option to purchase the underlying asset that the Company is reasonably expected to exercise; (iii) the lease term is for a major part of the remaining economic life of the underlying asset; (iv) the present value of the sum of lease payments and any residual value guaranteed by the Company equals or exceeds substantially all of the fair value of the underlying asset; or (v) the underlying asset is of a specialized nature that it is expected to have no alternative use to the lessor at the end of the lease term. A lease that does not meet any of the finance lease classification criteria is classified as an operating lease. Operating leases are included as Right-of-use assets, net, Current portion of operating lease liabilities, and Operating lease liabilities on the Consolidated Balance Sheets. ROU assets and operating lease liabilities are recognized based on the present value of the future lease payments over the lease term at the commencement date. As most of the Company’s leases do not provide an implicit rate for use in determining the present value of future payments, the Company uses an incremental borrowing rate. This incremental borrowing rate reflects the creditworthiness of the Company for a lending period commensurate to the term of the lease, the standard lending practices related to such loans in the respective jurisdiction where the underlying assets are located and the local currency in which the lease is denominated. ROU assets also include any lease payments made prior to or at the lease commencement date and initial direct costs incurred, and may be reduced by any lease incentives received by the lessor. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term, including rent abatement periods and rent holidays. Certain of the Company's leases are subject to annual changes in an index or are subject to adjustments for which the amounts are not readily determinable at lease inception. While lease liabilities are not remeasured as a result of changes to these costs, changes are treated as variable lease payments and recognized in the period in which the obligation for those payments were incurred. Finance leases are included as PP&E, net; Current maturities of long-term debt and Long-term debt on the Consolidated Balance Sheets. Finance lease costs are split between depreciation expense related to the asset and interest expense on the lease liability, using the effective rate charged by the lessor. The Company has lease agreements with both lease and non-lease components, which the Company has elected to account for as a single lease component. Additionally, the Company has elected not to record short-term leases, those with expected terms of twelve months or less, on the Company's Consolidated Balance Sheets. See Note 8, Debt and Credit Agreements and Note 9, Leases for additional information on leases. Goodwill In accordance with U.S. GAAP, goodwill is not amortized and is tested for impairment at least annually or more frequently if indicators of impairment exist or if a decision is made to dispose of a business. Goodwill is allocated among and evaluated for impairment at the reporting unit level, which is defined as an operating segment or one level below an operating segment for which discrete financial information is available. A significant amount of judgment is involved in determining if an indicator of impairment has occurred. Such indicators may include declining cash flows or operating losses at the reporting unit level, a significant adverse change in legal factors or in the business climate, an adverse action or assessment by a regulator, unanticipated competition, a loss of key personnel or a more likely than not expectation that a reporting unit or a significant portion of a reporting unit will be sold or otherwise disposed of, among others. In applying the goodwill impairment test, the Company has the option to perform a qualitative test, a quantitative test or both. Under the qualitative test, the Company assesses qualitative factors to determine whether it is more likely than not that the fair value of the reporting units is less than its carrying value. Qualitative factors may include, but are not limited to, economic conditions, industry and market considerations, cost factors, overall financial performance of the reporting unit and other entity and reporting unit specific events. If after assessing these qualitative factors, the Company determines it is “more-likely-than-not” that the fair value of the reporting unit is less than the carrying value, the Company would perform a quantitative test. The quantitative approach of testing for goodwill impairment involves comparing the current fair value of each reporting unit to the carrying value, including goodwill. The Company uses a discounted cash flow model (“DCF model”) to estimate the current fair value of reporting units, as the Company's management believes forecasted operating cash flows are the best indicator of current fair value. A number of significant assumptions and estimates are involved in the preparation of DCF models including future revenues and operating margin growth, the weighted-average cost of capital (“WACC”), tax rates, capital spending, pension funding, the impact of business initiatives and working capital projections. These assumptions and estimates may vary significantly among reporting units. DCF models are based on approved long-range plans for the early years and historical relationships and projections for later years. WACC rates are derived from internal and external factors including, but not limited to, the average market price of the Company's stock, shares outstanding, book value of the Company's debt, the long-term risk-free interest rate, and both market and size-specific risk premiums. Due to the many variables noted above and the relative size of the Company's goodwill, differences in assumptions may have a material impact on the results of the Company's annual goodwill impairment testing. If the net book value of a reporting unit were to exceed the Company's determination of the current fair value, then an impairment charge would be recognized as the difference between the fair value and the carrying value. See Note 7, Goodwill and Other Intangible Assets for additional information. Long-Lived Assets Impairments (Other than Goodwill) Long-lived assets or asset groups are reviewed for impairment when events and circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. Long-lived assets or asset groups are reviewed for impairment when events and circumstances indicate the book value of an asset or asset group may be impaired. The Company's policy is to determine if an impairment loss exists when it is determined that the carrying amount of the asset or asset group exceeds the sum of the expected undiscounted future cash flows resulting from use of the asset or asset group and its eventual disposition. Impairment losses are measured as the amount by which the carrying amount of the asset or asset group exceeds its fair value, normally as determined in either open market transactions or through the use of a DCF model. Long-lived assets or asset groups to be disposed of are reported at the lower of the carrying amount or fair value less cost to sell. See Note 7, Goodwill and Other Intangible Assets and Note 18, Other (Income) Expenses, N e t for additional information. Deferred Financing Costs The Company has incurred debt issuance costs, which are recognized as a reduction of Long-term debt on the Consolidated Balance Sheets. Debt issuance costs are amortized and recognized over the contractual term of the related indebtedness or shorter period, if appropriate, based upon contractual terms in Interest expense on the Consolidated Statements of Operations. Whenever indebtedness is modified from its original terms, an evaluation is made whether an accounting modification or extinguishment has occurred in order to determine the accounting treatment for debt issuance costs related to the debt modification. If the evaluation results in a gain (loss) on extinguishment of debt, the amount would be included in Facility fees and debt-related income (expense) on the Consolidated Statements of Operations. If the evaluation results in a modification of debt, unamortized costs would be amortized over the new contractual term. Revenue Recognition The Company recognizes revenues to depict the transfer of promised services and products to customers in an amount that reflects the consideration the Company expects to receive in exchange for those services or products. Revenues from continuing operations include service revenues from the Company's HE and CE Segments and product revenues from the Company's HE Segment. Revenue from the Rail business is included in Income (loss) from discontinued businesses. Harsco Environmental - This Segment provides on-site services, under long-term contracts which may contain multiple performance obligations, for material logistics; product quality improvement and resource recovery from iron, steel and metals manufacturing; manufactures and sells industrial abrasives and roofing granule products; and manufactures aluminum dross and scrap processing systems. •Service revenues are recognized over time as the customer simultaneously receives the benefits provided by the Company's performance. The Company utilizes an output method based on work performed (liquid steel tons processed, weight of material handled, etc.) to measure progress, which is deemed to best depict the transfer of value to the customer and revenue earned by the Company. Transaction prices are based on contractual terms, which may include both fixed and variable portions. The fixed portion is recognized as earned (normally monthly) over the contractual period. The variable portion is recognized as services are performed and differs based on the volume of services performed. Given the long-term nature of these arrangements, most contracts permit periodic adjustment of either the variable or both the fixed and variable portions based on the changes in macroeconomic indicators, including changes in commodity prices. Transaction prices, when the standalone selling price is not directly observable, are allocated to performance obligations utilizing an expected cost plus a margin approach. Amounts are typically billed and payable on a monthly basis as services are performed. •Product revenues are recognized at the point when control transfers to the customer. Control generally transfers at the point of shipment for domestic orders and in accordance with the international commercial terms included in contracts for export sales. Transaction prices are based on contractual terms, which are generally fixed and when the standalone selling price is not directly observable, allocated to performance obligations utilizing an adjusted market assessment approach. Amounts are billed and payable upon completion of each transaction. •Product revenues in the aluminum dross and scrap process systems business are generally recognized over time as control is transferred to the customer. Control transfers over time because aluminum dross and scrap systems are customized, have no alternate use and the Company has an enforceable right to payment. The Company utilizes an input method based on costs incurred ("cost-to-cost method") to measure progress, which is deemed to best depict the transfer of value to the customer and revenue earned by the Company. Transaction prices are based on contractual terms, which are generally fixed, and when the standalone selling price is not directly observable, allocated to performance obligations utilizing an adjusted market assessment approach. The Company may receive periodic payments associated with key milestones with any remaining consideration billed and payable upon completion of the transaction. Clean Earth - This Segment provides specialty waste processing and beneficial reuse solutions for hazardous wastes, and soil and dredged materials. •Revenues are recognized over time as the customer simultaneously receives the benefits provided by the Company's performance. The Company utilizes an output method based on the amount of materials received for processing to measure progress, which is deemed to best depict the transfer of value to the customer and revenue earned by the Company. Transaction prices are based on contractual terms, which are principally variable based on volume and recognized as services are performed. Amounts are typically billed and payable on a monthly basis. Harsco Rail - This business sells railway track maintenance equipment, after-market parts, Protran/safety equipment and provides railway track maintenance services. Certain contracts may contain multiple performance obligations, such as a sale of equipment with services and spare parts. •For standard railway track maintenance equipment sales, revenue is recognized at the point when control transfers to the customer. Control generally transfers at the point of shipment for domestic orders and in accordance with the international commercial terms included in contracts for export sales. In certain railway track maintenance equipment sales, revenue is recognized over time because such equipment is highly customized, has no alternate use and the Company has an enforceable right to payment. Rail uses the cost-to-cost method to measure progress because it is the measure that best depicts the transfer of control to the customer, which occurs as costs are incurred under the contracts. Under the cost-to-cost method, the extent of progress towards completion is based on the ratio of costs incurred to total estimated costs at completion, which includes both actual costs already incurred and the estimated costs to complete. Accounting for contracts with customers using the cost-to-cost method requires significant judgment relative to assessing risks; estimating contract revenues (including estimates of variable consideration, if applicable, as well as estimating any liquidating damages or penalties related to performance); estimating contract costs (including estimating engineering costs to design the machine and the material, labor and overhead manufacturing costs to build the machine); making assumptions for schedule and technical items; properly executing the engineering and design phases consistent with customer expectations; the availability and costs of labor and material resources; productivity; and evaluating whether a significant financing component is present. Due to the number of years it may take to complete certain contracts and the scope and nature of the work required to be performed on those contracts, estimating total revenues and costs at completion is inherently complicated and subject to many variables. Transaction prices are based on contracted terms, which are generally fixed, and when the standalone selling price is not directly observable, allocated to performance obligations utilizing either the adjusted market assessment or expected cost plus a margin approach. For certain transactions, the Company receives periodic payments associated with key milestones. In limited instances, those payments are intended to provide financing, with such transactions being treated as including a significant financing component. Any remaining consideration is billed and payable upon completion of the transaction. Railway track maintenance equipment revenue of approximately $70.9 million was recognized using the cost-to-cost method in 2023, the net profit or loss of which is included in Income (loss) from discontinued businesses in the Company's Consolidated Statements of Operations. •For after-market parts sales and Protran/safety equipment, revenue is recognized at the point when control transfers to the customer. Control generally transfers to the customer at the point of shipment for domestic orders and in accordance with the international commercial terms included in contracts for export sales. Transaction prices are based on contracted terms, which are generally fixed, and when the standalone selling price is not directly observable, allocated to performance obligations utilizing an adjusted market assessment approach. Amounts are billed and payable upon completion of each contract. •For railway track maintenance services, revenue is recognized over time as the customer simultaneously receives the benefits provided by the Company's performance. The Company utilizes an appropriate output method based on work performed (feet, miles, shifts worked, etc.) to measure progress, which is deemed to best depict the transfer of value to the customer and revenue earned by the Company. Transaction prices are based on contracted terms, which are generally variable. The variable portion is recognized as services are performed and differs based on the value of services. Given the long-term nature of these arrangements, most contracts permit periodic adjustment based on the changes in macroeconomic indicators. Transaction prices, when the standalone selling price is not directly observable, are allocated to performance obligations utilizing an expected cost plus a margin approach. Amounts are typically billed and payable on a monthly basis as services are performed. The Company has elected to utilize the following practical expedients on an ongoing basis: •The Company has not adjusted the promised amount of consideration for the effects of a significant financing component if the Company expects, at contract inception, that the period between when the Company transfers the promised good or services to the customer and when the customer pays for that good or service would be one year or less; and •The Company has elected to exclude disclosures related to unsatisfied performance obligations where the related contract has a duration of one year or less; or where the consideration is entirely variable. Accordingly, the Company's disclosure related to unsatisfied performance obligations is limited to the fixed portion of fees related to metals services in HE. Taxes assessed by governmental authorities that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the Company from a customer, are excluded from revenue. Additionally, in certain contracts, the Company facilitates shipping and handling activities after control has transferred to the customer. The Company has elected to record all shipping and handling activities as costs to fulfill a contract. In situations where the shipping and handling costs have not been incurred at the time revenue is recognized, the respective shipping and handling costs are accrued. Income Taxes The Company accounts for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of the events that have been included in the consolidated financial statements. Under this method, deferred tax assets and liabilities are determined based on the differences between the consolidated financial statements and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. The Company records deferred tax assets to the extent that the Company believes that these assets will more likely than not be realized. In making such determinations, the Company considers all available positive and negative evidence, including future reversals of existing deferred tax liabilities, projected future taxable income, tax planning strategies and recent financial results. If the Company determines that it will not be able to realize deferred income tax assets in the future, a valuation allowance is recorded. If sufficient positive evidence arises in the future indicating that all or a portion of the deferred tax assets meet the more likely than not standard for realization, the valuation allowance would be reduced accordingly in the period that such a conclusion is reached. The Company prepares and files tax returns based on interpretation of tax laws and regulations and records its provision for income taxes based on these interpretations. Uncertainties may exist in estimating the Company's tax provisions and in filing tax returns in the many jurisdictions in which the Company operates, and as a result these interpretations may give rise to an uncertain tax position. The tax benefit from an uncertain tax position is recognized when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, based on its technical merits. Each subsequent period, the Company determines if existing or new uncertain tax positions meet a more likely than not recognition threshold and adjusts accordingly. The Company recognizes interest and penalties related to unrecognized tax benefits within Income tax expense in the accompanying Consolidated Statements of Operations. Liabilities for uncertain tax positions are included in Other liabilities on the Consolidated Balance Sheets. The significant assumptions and estimates described in the preceding paragraphs are important contributors to the effective tax rate each year. See Note 11, Income Taxes, for additional information. Accrued Insurance and Loss Reserves The Company retains a significant portion of the risk for certain U.S. workers' compensation, U.K. employers' liability, automobile, general and product liability losses. Insurance reserves have been recorded that reflect the undiscounted estimated liabilities including claims incurred but not reported. When a recognized liability is covered by third-party insurance, the Company records an insurance claim receivable to reflect the covered liability. Changes in the estimates of the reserves are included in net income (loss) in the period determined. During 2023, the Company recorded insurance reserve adjustments that increased pre-tax insurance expense from continuing operations for self-insured programs by $0.7 million, During 2022 and 2021, the Company recorded insurance reserve adjustments that decreased pre-tax insurance expense from continuing operations for self-insured programs by $1.0 million and $0.2 million, respectively. At December 31, 2023 and 2022, the Company has recorded liabilities of $31.5 million and $32.4 million, respectively, related to both asserted as well as unasserted insurance claims. Included in the balances at December 31, 2023 and 2022 were $6.5 million and $4.0 million, respectively, of recognized liabilities covered by insurance carriers. Amounts estimated to be paid within one year have been included in Other current liabilities, with the remainder included in Other liabilities, on the Company's Consolidated Balance Sheets. Foreign Currency Translation The financial statements of the Company's subsidiaries outside the U.S., except for Turkey and Argentina which are located in highly inflationary economies and those entities for which the U.S. dollar is the functional currency, are measured using the local currency as the functional currency. Assets and liabilities of these subsidiaries are translated at the exchange rates at the balance sheet date. Resulting translation adjustments are recorded in the cumulative translation adjustment account, a separate component of AOCI, on the Consolidated Balance Sheets. Income and expense items are translated at average monthly exchange rates. Gains and losses from foreign currency transactions are included in Operating income from continuing operations. For subsidiaries operating in highly inflationary economies, and those entities for which the U.S. dollar is the currency of the primary economic environment in which the entity operates, gains and losses on foreign currency transactions and balance sheet translation adjustments are included in Operating income from continuing operations. Financial Instruments and Hedging The Company has operations throughout the world that are exposed to fluctuations in related foreign currencies in the normal course of business. The Company seeks to reduce exposure to foreign currency fluctuations through the use of forward exchange contracts. The Company does not hold or issue financial instruments for trading purposes, and it is the Company's policy to prohibit the use of derivatives for speculative purposes. The Company has a Foreign Currency Risk Management Committee that meets periodically to monitor foreign currency risks. The Company executes foreign currency exchange forward contracts to hedge transactions for firm purchase commitments, to hedge variable cash flows of forecasted transactions and for export sales denominated in foreign currencies. These contracts are generally for 90 days or less; however, where appropriate, longer-term contracts may be utilized. For those contracts that are designated as qualified cash flow hedges, gains or losses are recorded in AOCI on the Consolidated Balance Sheets. The Company uses interest rate swaps in conjunction with certain debt issuances in order to secure a fixed interest rate. The interest rate swaps are recorded on the Consolidated Balance Sheets at fair value, with changes in value attributed to the effect of the swaps’ interest spread and changes in the credit worthiness of the counter-parties recorded in AOCI. Amounts recorded in AOCI on the Consolidated Balance Sheets are reclassified into income in the same period or periods during which the hedged forecasted transaction affects income. The cash flows from these contracts are classified consistent with the cash flows from the transaction being hedged (e.g., the cash flows related to contracts to hedge the purchase of fixed assets are included in cash flows from investing activities, etc.). The Company also enters into certain forward exchange contracts that are not designated as hedges. Gains and losses on these contracts are recognized in the Consolidated Statements of Operations based on changes in fair market value. For fair value hedges of a firm commitment, the gain or loss on the derivative and the offsetting gain or loss on the hedged firm commitment are recognized concurrently in the Consolidated Statements of Operations. See Note 15, Financial Instruments, for additional information. Earnings Per Share Basic earnings per share are calculated using the weighted-average shares of common stock outstanding, while diluted earnings per share reflect the dilutive effects of stock-based compensation. Dilutive securities are not included in the computation of loss per share when the Company reports a net loss from continuing operations, as the impact would be anti-dilutive. All share and per share amounts are restated for any stock splits and stock dividends that occur prior to the issuance of the financial statements. See Note 13, Capital Stock, for additional information. Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses. Actual results could differ from those estimates.

Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Summary of revenues by primary geographical markets

A summary of the Company's revenues by primary geographical markets as well as by key product and service groups for the years ended December 31, 2023, 2022 and 2021 is as follows:


	Year Ended December 31, 2023
(In thousands)	Harsco Environmental Segment		Clean Earth Segment		Consolidated Totals
Primary Geographical Markets (a):
North America	$	318,574	$	928,321	$	1,246,895
Western Europe	431,893		—		431,893
Latin America (b)	170,194		—		170,194
Asia-Pacific	113,800		—		113,800
Middle East and Africa	86,867		—		86,867
Eastern Europe	19,576		—		19,576
Total Revenues	$	1,140,904	$	928,321	$	2,069,225

Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing; and related logistical services	$	950,961	$	—	$	950,961
Ecoproducts	162,291		—		162,291
Environmental systems for aluminum dross and scrap processing	27,652		—		27,652
Hazardous waste processing solutions	—		767,338		767,338
Soil and dredged materials processing and reuse solutions	—		160,983		160,983

Total Revenues	$	1,140,904	$	928,321	$	2,069,225


	Year Ended December 31, 2022
(In thousands)	Harsco Environmental Segment		Clean Earth Segment		Consolidated Totals
Primary Geographical Markets (a):
North America	$	297,544	$	827,826	$	1,125,370
Western Europe	389,713		—		389,713
Latin America (b)	155,235		—		155,235
Asia-Pacific	119,433		—		119,433
Middle East and Africa	79,562		—		79,562
Eastern Europe	19,752		—		19,752
Total Revenues	$	1,061,239	$	827,826	$	1,889,065
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing; and related logistical services	$	900,426	$	—	$	900,426
Ecoproducts	145,911		—		145,911
Environmental systems for aluminum dross and scrap processing	14,902		—		14,902
Hazardous waste processing solutions	—		681,804		681,804
Soil and dredged materials processing and reuse solutions	—		146,022		146,022

Total Revenues	$	1,061,239	$	827,826	$	1,889,065


	Year Ended December 31, 2021
(In thousands)	Harsco Environmental Segment		Clean Earth Segment		Consolidated Totals
Primary Geographical Markets (a):
North America	$	281,125	$	780,316	$	1,061,441
Western Europe	442,286		—		442,286
Latin America (b)	132,349		—		132,349
Asia-Pacific	110,790		—		110,790
Middle East and Africa	81,337		—		81,337
Eastern Europe	20,196		—		20,196
Total Revenues	$	1,068,083	$	780,316	$	1,848,399
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing; and related logistical services	$	920,580	$	—	$	920,580
Ecoproducts	132,389		—		132,389
Environmental systems for aluminum dross and scrap processing	15,114		—		15,114
Hazardous waste processing solutions	—		639,233		639,233
Soil and dredged materials processing and reuse solutions	—		141,083		141,083

Total Revenues	$	1,068,083	$	780,316	$	1,848,399

(a) Revenues are attributed to individual countries based on the location of the facility generating the revenue.

(b) Includes Mexico.

Stock-Based Compensation (Stock Appreciation Rights) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended							12 Months Ended
	May 31, 2023	Mar. 31, 2023	Dec. 31, 2022	Oct. 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2023
Number of Shares
Stock appreciation rights exercised (in shares)									(16,671)	(28,789)
Weighted Average Exercise Price
Options vested, outstanding (in shares)								1,704,714
Options non-vested (in shares)								598,304
Weighted Average Exercise Price Per Share (in dollars per share)								$ 13.01
Weighted-Average Remaining Contractual Life in Years								5 years 1 month 17 days
Number of exercisable options (in shares)								1,704,714
Weighted average exercise price per share (in dollars per share)								$ 14.30
$5.02 - $13.70
Weighted Average Exercise Price
Options vested, outstanding (in shares)								961,955
Options non-vested (in shares)								559,029
Weighted Average Exercise Price Per Share (in dollars per share)								$ 9.42
Weighted-Average Remaining Contractual Life in Years								6 years 2 months 23 days
Number of exercisable options (in shares)								961,955
Weighted average exercise price per share (in dollars per share)								$ 9.85
$16.53 - $22.70
Weighted Average Exercise Price
Options vested, outstanding (in shares)								569,276
Options non-vested (in shares)								39,275
Weighted Average Exercise Price Per Share (in dollars per share)								$ 18.65
Weighted-Average Remaining Contractual Life in Years								3 years 8 months 19 days
Number of exercisable options (in shares)								569,276
Weighted average exercise price per share (in dollars per share)								$ 18.65
$23.25 - $26.92
Weighted Average Exercise Price
Options vested, outstanding (in shares)								173,483
Options non-vested (in shares)								0
Weighted Average Exercise Price Per Share (in dollars per share)								$ 24.69
Weighted-Average Remaining Contractual Life in Years								5 months 15 days
Number of exercisable options (in shares)								173,483
Weighted average exercise price per share (in dollars per share)								$ 24.69
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)								3 years
Expiration period (in years)								10 years
Fair value assumptions
Risk-free interest rate (as a percent)	3.48%	4.20%	3.75%	4.10%	3.56%	1.67%	0.91%
Dividend yield (as a percent)	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Expected life	6 years	6 years	6 years	6 years	6 years	6 years	6 years
Volatility (as a percent)	63.00%	62.60%	62.40%	61.30%	60.60%	60.30%	61.90%
SAR grant price (usd per share)	$ 9.31	$ 7.45		$ 5.26		$ 12.65	$ 18.58	$ 6.15			$ 5.02
Number of Shares
Outstanding at beginning of period (in shares)								2,091,862
Granted (in shares)								453,021
Forfeited (in shares)								(241,865)
Outstanding at end of period (in shares)			2,091,862					2,303,018	2,091,862
Weighted Average Exercise Price
Outstanding at beginning of period (usd per share)								$ 14.68
Granted (usd per share)								7.65
Forfeited/expired (usd per share)								17.37
Outstanding at end of period			$ 14.68					$ 13.01	$ 14.68
Outstanding - Aggregate Intrinsic Value			$ 0					$ 1,300	$ 0
Total intrinsic value of SARs								0	0	$ 600
Recognized stock-based compensation expense								1,500	$ 1,500	1,800
Unrecognized stock-based compensation expense								$ 2,100
Unrecognized stock-based compensation expense, period of recognition								1 year 10 months 24 days
Unvested activity
Nonvested at the beginning of the period (in shares)								470,471
Granted (in shares)								453,021
Vested (in shares)								(276,566)
Forfeited								(48,622)
Nonvested at the end of the period (in shares)			470,471					598,304	470,471
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)								$ 6.16
Granted (in dollars per share)	$ 5.64	$ 4.56	$ 3.72	$ 3.17	$ 2.97	$ 7.20	$ 10.48	4.68
Vested (in dollars per share)								5.19
Forfeited (in dollars per share)								5.76
Nonvested at the end of the period (in dollars per share)			$ 6.16					5.51	$ 6.16
Stock Appreciation Rights (SARs) \| $5.02 - $13.70
Weighted Average Exercise Price
Range of Exercisable Prices, low end of range (in dollars per share)								5.02
Range of Exercisable Prices, high end of range (in dollars per share)								13.70
Stock Appreciation Rights (SARs) \| $16.53 - $22.70
Weighted Average Exercise Price
Range of Exercisable Prices, low end of range (in dollars per share)								16.53
Range of Exercisable Prices, high end of range (in dollars per share)								22.70
Stock Appreciation Rights (SARs) \| $23.25 - $26.92
Weighted Average Exercise Price
Range of Exercisable Prices, low end of range (in dollars per share)								23.25
Range of Exercisable Prices, high end of range (in dollars per share)								$ 26.92
Performance Shares [Member]
Fair value assumptions
Risk-free interest rate (as a percent)	3.75%	4.67%				1.59%	0.25%
Dividend yield (as a percent)	0.00%	0.00%				0.00%	0.00%
Expected life	2 years 7 months 24 days	2 years 9 months 25 days				2 years 9 months 29 days	2 years 9 months 29 days
Weighted Average Exercise Price
Recognized stock-based compensation expense								$ 5,800	$ 4,200	5,100
Unrecognized stock-based compensation expense								$ 7,200
Unrecognized stock-based compensation expense, period of recognition								1 year 8 months 12 days
Unvested activity
Nonvested at the beginning of the period (in shares)								661,952
Granted (in shares)	29,337	758,965				500,624	316,959	788,302
Vested (in shares)								(225,667)
Forfeited								(116,331)
Nonvested at the end of the period (in shares)			661,952					1,108,256	661,952
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)								$ 19.94
Granted (in dollars per share)	$ 15.24	$ 10.91				$ 16.54	$ 25.38	11.07
Vested (in dollars per share)								25.38
Forfeited (in dollars per share)								16.63
Nonvested at the end of the period (in dollars per share)			$ 19.94					$ 12.87	$ 19.94
Performance period								3 years
Restricted stock units
Weighted Average Exercise Price
Recognized stock-based compensation expense								$ 4,352	$ 4,335	$ 4,819
Unrecognized stock-based compensation expense								$ 6,200
Unrecognized stock-based compensation expense, period of recognition								2 years
Unvested activity
Nonvested at the beginning of the period (in shares)								671,584
Granted (in shares)								1,006,715
Vested (in shares)								(364,241)
Forfeited								(94,737)
Nonvested at the end of the period (in shares)			671,584					1,219,321	671,584
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)								$ 12.51
Granted (in dollars per share)								7.25
Vested (in dollars per share)								11.34
Forfeited (in dollars per share)								10.87
Nonvested at the end of the period (in dollars per share)			$ 12.51					$ 8.63	$ 12.51
Restricted stock units \| Non-employee
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)								1 year
Restricted stock units \| Officers And Key Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)								3 years
2013 Equity and Incentive Compensation Plan \| Stock Appreciation Rights (SARs)
Unvested activity
Granted (in shares)	48,427	404,594	10,000	10,000	10,000	312,987	184,641

Income Taxes (Details 4) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details 4) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
U.S.	$ 28,658	$ 152,602	$ 34,462
Interest and penalties recognized	0	400	$ (400)
Asset
Depreciation and amortization	0	0
Deferred Tax Assets. Right-of-use assets	0	0
Deferred Tax Liability, Operating lease liabilities	0	0
Operating lease liabilities	24,222	25,024
Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals	0	0
Expense accruals	33,790	28,758
Deferred Tax Liabilities, Inventory	0	0
Inventories	3,704	4,011
Deferred Tax Liability, Tax Deferred Expense, Reserve and Accrual, Accounts Receivable, Allowance for Credit Loss	0	0
Provision for receivables	3,801	2,781
Deferred Tax Assets, Deferred Income	6,377	4,484
Deferred Tax Liability, Operating loss carryforwards	0	0
Operating loss carryforwards	54,935	54,237
Deferred Tax Liability, Tax credit carryforwards	0	0
Tax credit carryforwards	15,298	21,443
Pensions	0	5,171
Deferred Tax Liabilities, Unrealized Currency Loss	754	3,330
Currency adjustments	0	0
Section 163(j) disallowed interest expense	25,937	13,869
Deferred Tax Liabilities, Deferred Expense, Capitalized Research and Development Costs	0	0
Research and development	6,014	2,795
Deferred Tax Liability, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost	0	0
Stock based compensation	7,387	6,580
Other	0	0
Subtotal	181,465	169,153
Deferred Tax Liability, Valuation Allowance	0	0
Valuation allowance	(112,905)	(89,234)
Total deferred income taxes	68,560	79,919
Liability
Depreciation and amortization	55,004	61,145
Right-of-use assets	23,887	24,826
Deferred revenue	0	0
Deferred Tax Liabilities, Other	1,823	3,198
Total deferred income taxes	82,048	92,499
Valuation Allowance, Deferred Tax Asset, Decrease From Pension Adjustment	12,700
Increase from unrealized current year losses in foreign jurisdictions	9,300
Foreign Currency Translation Adjustment, Valuation Allowance Reduction, Reduction to Deferred Tax Assets	$ 2,300
Dividend Received Deduction, Tax Act, Percent	100.00%
Deferred Tax Liability, Tax Deferred Expense, Compensation and Benefits, Pensions	$ 580	0
Deferred Tax Liability, Disallowed Interest Expense	0	$ 0
Capital Loss Carryforward
Liability
Tax Credit Carryforward, Amount	1,100,000
International operations
Operating Loss Carryforwards [Line Items]
Operating losses subject to expiration	4,300
Operating loss carryforwards not subject to expiration	39,600
Asset
Operating loss carryforwards	43,900
U.S. state
Asset
Operating loss carryforwards	11,000
U.S. state \| Tax Years 2021 Through 2025 [Member]
Asset
Operating loss carryforwards	2,300
U.S. state \| Tax Years 2026 Through 2030 [Member]
Asset
Operating loss carryforwards	1,700
U.S. state \| Tax Years 2031 Through 2035 [Member]
Asset
Operating loss carryforwards	3,100
U.S. state \| Tax Years 2036 Through 2040 [Member]
Asset
Operating loss carryforwards	$ 3,900

Components of Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2023

Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]

Components of accumulated other comprehensive loss

The components of AOCI, net of the effect of income taxes, and activity for the years ended December 31, 2023 and 2022 are as follows:


	Components of AOCI - Net of Tax
(In thousands)	Cumulative Foreign Exchange Translation Adjustments			Effective Portion of Derivatives Designated as Hedging Instruments			Cumulative Unrecognized Actuarial Losses on Pension Obligations			Unrealized Gain (Loss) on Marketable Securities		Total


Balance at December 31, 2021	$	(134,889)		$	(3,024)		$	(422,248)		$	22	$	(560,139)
OCI before reclassifications	(82,325)		(a)	1,642		(b)	50,378		(c)	(12)		(30,317)
Amounts reclassified from AOCI, net of tax	—			1,539			17,171			—		18,710
Total OCI	(82,325)			3,181			67,549			(12)		(11,607)
Less: OCI attributable to noncontrolling interests	4,110			—			—			—		4,110
OCI attributable to Enviri Corporation	(78,215)			3,181			67,549			(12)		(7,497)
Balance at December 31, 2022	(213,104)			157			(354,699)			10		(567,636)
OCI before reclassifications	29,495		(a)	64		(b)	(19,265)		(c)	5		10,299
Amounts reclassified from AOCI, net of tax	(507)			(691)			18,224			—		17,026
Total OCI	28,988			(627)			(1,041)			5		$	27,325
Less: OCI attributable to noncontrolling interests	617			—			—			—		617
OCI attributable to Enviri Corporation	29,605			(627)			(1,041)			5		27,942
Balance at December 31, 2023	$	(183,499)		$	(470)		$	(355,740)		$	15	$	(539,694)

(a) Principally foreign currency fluctuation.

(b) Principally net change from periodic revaluations.

Amounts reclassified out of accumulated other comprehensive loss

Amounts reclassified from AOCI for 2023 and 2022 are as follows:


	Year Ended December 31, 2023		Year Ended December 31, 2022		Affected Caption on the Consolidated Statements of Operations
(In thousands)
Amortization of defined benefit pension items (d):
Actuarial losses	$	18,917	$	17,792	Defined benefit pension income (expense)

Prior-service costs	519		534		Defined benefit pension income (expense)

Settlement/curtailment loss (gain)	—		96		Income (loss) from discontinued businesses
Settlement/curtailment gain	(42)		(33)		Defined benefit pension income (expense)
Total before tax	19,394		18,389
Tax benefit	(1,170)		(1,218)
Total reclassification of defined benefit pension items, net of tax	$	18,224	$	17,171



Amortization of cash flow hedging instruments(e):
Foreign currency exchange forward contracts	$	1,638	$	(1,746)	Income (loss) from discontinued businesses


Interest rate swaps	(2,576)		4,245		Interest expense

Total before tax	(938)		2,499
Tax benefit	247		(960)
Total reclassification of cash flow hedging instruments	$	(691)	$	1,539
Recognition of cumulative foreign exchange translation adjustments:
Gain on substantial liquidation of subsidiaries(f)	$	(507)	$	—	Other (income) expenses, net

Total reclassification of cumulative foreign exchange translation adjustments	$	(507)	$	—

(d) These AOCI components are included in the computation of NPPC. See Note 10, Employee Benefit Plans, for additional information.

(e) See Note 15, Financial Instruments for additional information.

(f) No tax impact

Employee Benefit Plans (Details 3) - Pension Plan $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) market shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Expected long-term rates of return on plan assets for next year (as a percent)	5.70%
Expected long-term rates of return on plan assets	5.50%	4.70%	5.10%
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 209,200	$ 209,200
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]
Projected benefit obligation	209,200	209,200
Accumulated benefit obligation	209,200	209,200
Fair value of plan assets	$ 180,900	$ 177,000
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Number of capital market results simulated in the model for expected return on plan assets \| market	1,000
Period for which results of capital markets are simulated	20 years
Expected long-term rates of return on plan assets for next year (as a percent)	7.00%
Expected long-term rates of return on plan assets	7.00%	6.30%	6.80%
Number of shares of Company's common stock included in plan assets \| shares	310,000	310,000
Fair values of plan assets	$ 180,927	$ 177,044	$ 232,947
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	177,044	232,947
Employer contributions	1,674	1,706
Fair value of plan assets at end of year	$ 180,927	$ 177,044	$ 232,947
U.S. Plans \| Domestic equity securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31	10.70%	21.00%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	$ 2,791	$ 1,951
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,951
Fair value of plan assets at end of year	$ 2,791	1,951
U.S. Plans \| Domestic equity securities \| Minimum
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)	6.00%
U.S. Plans \| Domestic equity securities \| Maximum
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)	16.00%
U.S. Plans \| Domestic mutual funds—equities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	$ 16,583	35,177
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	35,177
Fair value of plan assets at end of year	$ 16,583	$ 35,177
U.S. Plans \| International equity securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31	24.30%	22.20%
U.S. Plans \| International equity securities \| Minimum
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)	22.00%
U.S. Plans \| International equity securities \| Maximum
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)	32.00%
U.S. Plans \| International equities—mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	$ 43,994	$ 39,287
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	39,287
Fair value of plan assets at end of year	$ 43,994	$ 39,287
U.S. Plans \| Harsco common stock
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31	1.50%	1.10%
U.S. Plans \| Fixed income securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31	52.80%	44.60%
U.S. Plans \| Fixed income securities \| Minimum
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)	51.00%
U.S. Plans \| Fixed income securities \| Maximum
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)	61.00%
U.S. Plans \| U.S. Treasuries and collateralized securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	$ 13,920
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at end of year	13,920
U.S. Plans \| Mutual funds - bonds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	81,634	$ 78,943
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	78,943
Fair value of plan assets at end of year	$ 81,634	$ 78,943
U.S. Plans \| Other
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31	11.30%	11.20%
U.S. Plans \| Other \| Minimum
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)	1.00%
U.S. Plans \| Other \| Maximum
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)	11.00%
U.S. Plans \| Other mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	$ 4,913	$ 6,699
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	6,699
Fair value of plan assets at end of year	$ 4,913	$ 6,699
U.S. Plans \| Cash and cash equivalents
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31	0.90%	1.00%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	$ 1,661	$ 1,780
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,780
Fair value of plan assets at end of year	$ 1,661	1,780
U.S. Plans \| Cash and cash equivalents \| Maximum
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)	5.00%
U.S. Plans \| Partnership [Member]
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	$ 15,431	13,207
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	13,207
Fair value of plan assets at end of year	15,431	13,207
U.S. Plans \| Defined Benefit Plan, Equity Securities, Common Stock, Employer, Related Party [Member]
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Value of shares of Company's common stock included in plan assets	2,800	2,000
U.S. Plans \| Level 1
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	165,496	163,837
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	163,837
Fair value of plan assets at end of year	165,496	163,837
U.S. Plans \| Level 1 \| Domestic equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	2,791	1,951
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,951
Fair value of plan assets at end of year	2,791	1,951
U.S. Plans \| Level 1 \| Domestic mutual funds—equities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	16,583	35,177
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	35,177
Fair value of plan assets at end of year	16,583	35,177
U.S. Plans \| Level 1 \| International equities—mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	43,994	39,287
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	39,287
Fair value of plan assets at end of year	43,994	39,287
U.S. Plans \| Level 1 \| U.S. Treasuries and collateralized securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	13,920
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at end of year	13,920
U.S. Plans \| Level 1 \| Mutual funds - bonds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	81,634	78,943
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	78,943
Fair value of plan assets at end of year	81,634	78,943
U.S. Plans \| Level 1 \| Other mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	4,913	6,699
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	6,699
Fair value of plan assets at end of year	4,913	6,699
U.S. Plans \| Level 1 \| Cash and cash equivalents
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	1,661	1,780
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,780
Fair value of plan assets at end of year	1,661	1,780
U.S. Plans \| Level 1 \| Partnership [Member]
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
U.S. Plans \| Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	15,431	13,207
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	13,207
Fair value of plan assets at end of year	15,431	13,207
U.S. Plans \| Fair Value Measured at Net Asset Value Per Share [Member] \| Domestic equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
U.S. Plans \| Fair Value Measured at Net Asset Value Per Share [Member] \| Domestic mutual funds—equities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
U.S. Plans \| Fair Value Measured at Net Asset Value Per Share [Member] \| International equities—mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
U.S. Plans \| Fair Value Measured at Net Asset Value Per Share [Member] \| U.S. Treasuries and collateralized securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at end of year	0
U.S. Plans \| Fair Value Measured at Net Asset Value Per Share [Member] \| Mutual funds - bonds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
U.S. Plans \| Fair Value Measured at Net Asset Value Per Share [Member] \| Other mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
U.S. Plans \| Fair Value Measured at Net Asset Value Per Share [Member] \| Cash and cash equivalents
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
U.S. Plans \| Fair Value Measured at Net Asset Value Per Share [Member] \| Partnership [Member]
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	15,431	13,207
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	13,207
Fair value of plan assets at end of year	15,431	13,207
International Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	636,400	593,400
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]
Projected benefit obligation	27,800	25,300
Accumulated benefit obligation	24,100	22,600
Fair value of plan assets	$ 9,700	$ 9,400
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Expected long-term rates of return on plan assets for next year (as a percent)	5.30%
Expected long-term rates of return on plan assets	5.10%	4.40%	4.70%
Fair values of plan assets	$ 667,524	$ 607,234	$ 973,252
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	607,234	973,252
Employer contributions	24,715	22,614
Fair value of plan assets at end of year	$ 667,524	$ 607,234	$ 973,252
International Plans \| Equity Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31	10.80%	24.80%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)	16.00%
International Plans \| Mutual funds - equities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	$ 71,755	$ 150,813
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	150,813
Fair value of plan assets at end of year	$ 71,755	$ 150,813
International Plans \| Fixed income securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31	83.30%	65.50%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)	78.00%
International Plans \| Mutual funds - bonds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	$ 551,701	$ 392,960
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	392,960
Fair value of plan assets at end of year	551,701	392,960
International Plans \| Insurance contracts
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	4,631	4,636
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	4,636
Fair value of plan assets at end of year	$ 4,631	$ 4,636
International Plans \| Other
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31	5.40%	8.20%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)	6.00%
International Plans \| Other mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	$ 36,188	$ 49,805
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	49,805
Fair value of plan assets at end of year	$ 36,188	$ 49,805
International Plans \| Cash and cash equivalents
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31	0.50%	1.50%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)	0.00%
Fair values of plan assets	$ 3,249	$ 9,020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	9,020
Fair value of plan assets at end of year	3,249	9,020
International Plans \| Level 1
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	3,249	9,020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	9,020
Fair value of plan assets at end of year	3,249	9,020
International Plans \| Level 1 \| Mutual funds - equities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
International Plans \| Level 1 \| Mutual funds - bonds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
International Plans \| Level 1 \| Insurance contracts
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
International Plans \| Level 1 \| Other mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	0	0
International Plans \| Level 1 \| Cash and cash equivalents
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	3,249	9,020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	9,020
Fair value of plan assets at end of year	3,249	9,020
International Plans \| Level 2
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	664,275	598,214
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	598,214
Fair value of plan assets at end of year	664,275	598,214
International Plans \| Level 2 \| Mutual funds - equities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	71,755	150,813
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	150,813
Fair value of plan assets at end of year	71,755	150,813
International Plans \| Level 2 \| Mutual funds - bonds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	551,701	392,960
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	392,960
Fair value of plan assets at end of year	551,701	392,960
International Plans \| Level 2 \| Insurance contracts
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	4,631	4,636
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	4,636
Fair value of plan assets at end of year	4,631	4,636
International Plans \| Level 2 \| Other mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	36,188	49,805
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	49,805
Fair value of plan assets at end of year	36,188	49,805
International Plans \| Level 2 \| Cash and cash equivalents
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets	0	0
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0
Fair value of plan assets at end of year	$ 0	$ 0
International, Other Than United Kingdom [Member]
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Pension plan assets as a percentage of international plan assets	6.00%
United Kingdom
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Expected long-term rates of return on plan assets for next year (as a percent)	5.30%	5.00%
Pension plan assets as a percentage of international plan assets	94.00%

Capital Stock (Details) - $ / shares	Dec. 31, 2023	Dec. 31, 2022
Equity [Abstract]
Common stock authorized (in shares)	150,000,000
Preferred stock authorized (in shares)	4,000,000
Common stock, par value (usd per share)	$ 1.25	$ 1.25
Preferred stock authorized, par value (in dollars per share)	$ 1.25
Preferred stock, shares issued (in shares)	0

Goodwill and Other Intangible Assets- Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Line Items]
Goodwill, Impairment Loss			$ 104,580
Goodwill		$ 767,952	759,253	$ 883,109
Impaired asset write-downs		88	641	1,005
Clean Earth
Goodwill [Line Items]
Goodwill, Impairment Loss	$ 104,600		104,580
Goodwill		379,299	379,299	483,879
Impaired asset write-downs		0	59	63
Harsco Environmental
Goodwill [Line Items]
Goodwill, Impairment Loss			0
Goodwill		388,653	379,954	399,230
Impaired asset write-downs		88	582	$ 942
Altek Group
Goodwill [Line Items]
Impaired asset write-downs		15,000
Asset Impairment Charges, Carrying Value		$ 14,200	$ 15,300

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482548/350-20-55-24

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1A

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-2

+ Details

Stock-Based Compensation

12 Months Ended

Dec. 31, 2023

Share-Based Payment Arrangement [Abstract]

Stock-Based Compensation

The 2013 Equity and Incentive Plan as amended (the "2013 Plan") authorizes the issuance of up to 12.1 million shares of the Company's common stock for use in paying incentive compensation awards in the form of stock options or other equity awards such as restricted stock, restricted stock units ("RSUs"), stock appreciation rights ("SARs") or performance share units ("PSUs"). Of the 12.1 million shares authorized, a maximum of 8.1 million shares may be issued for awards other than option rights or SARs, as defined in the 2013 Plan. The 2016 Non-Employee Directors' Long-Term Equity Compensation Plan, as amended (the "2016 Plan"), authorizes the issuance of up to 800 thousand shares of the Company's common stock for equity awards. Both plans have been approved by the Company's stockholders. At December 31, 2023, there were 3.1 million shares available for granting equity awards under the 2013 Plan, of which 1.9 million shares were available for awards other than option rights or SARs. At December 31, 2023, there were 181 thousand shares available for granting equity awards under the 2016 Plan.

Restricted Stock Units

The Board approves the granting of performance-based RSUs as the long-term equity component of director, officer and certain key employee compensation. The RSUs require no payment from the recipient and compensation cost is measured based on the market price of the Company's common stock on the grant date and is generally recorded over the vesting period. RSUs granted to officers and certain key employees in 2021, 2022 and 2023 either vest on a pro-rata basis over three years or upon obtainment of specified retirement or years of service criteria. The vesting period for RSUs granted to non-employee directors is one year and each RSU is exchanged for an equal number of shares of the Company's common stock upon vesting for awards issued under the 2016 and 2013 Plans. There is no option for cash payment.

The following table summarizes RSUs issued and the compensation expense from continuing operations recorded for the years ended December 31, 2023, 2022, and 2021:


	RSUs (a)	Weighted Average Fair Value	Expense
(Dollars in thousands, except per unit)			2023		2022		2021
Directors:










2020	34,986	10.29	—		—		120
2021	23,224	21.53	—		167		333
2022	63,696	7.85	167		333		—
2023	80,705	9.03	516		—		—
Employees:










2018	242,791	19.93	—		—		142
2019	270,864	22.25	—		314		1,239
2020	522,087	8.22	91		741		1,093
2021	343,125	18.62	910		1,294		1,892
2022	450,915	12.36	1,040		1,486		—
2023	926,010	7.09	1,628		—		—
Total			$	4,352	$	4,335	$	4,819

(a) Represents number of awards originally issued.

RSU activity for the year ended December 31, 2023 was as follows:



	Number of Shares	Weighted Average Grant-Date Fair Value












Non-vested at December 31, 2022	671,584	$	12.51
Granted	1,006,715	7.25
Vested	(364,241)	11.34
Forfeited	(94,737)	10.87
Non-vested at December 31, 2023	1,219,321	$	8.63

At December 31, 2023, the total unrecognized compensation expense related to non-vested RSUs was $6.2 million, which will be recognized over a weighted-average period of 2.0 years.

The total fair value of RSU's vested in 2023, 2022 and 2021 was $4.1 million, $5.1 million and $4.1 million, respectively.

Stock Appreciation Rights

The Board approves the granting of SARs to officers and certain key employees under the 2013 Plan. The SARs generally vest on a pro-rata three-year basis from the grant date or upon specified retirement or years of service criteria and expire no later than ten years after the grant date. The exercise price of the SARs is equal to the fair value of Enviri common stock on the grant date. Upon exercise, shares of the Company's common stock are issued based on the increase in the fair value of the Company's common stock over the exercise price of the SAR. SARs do not have an option for cash payment.

The table below summarizes the total SARs granted and the fair value of each grant estimated on the grant date using a Black-Scholes pricing model with the following assumptions:



	Number of Shares Granted	Risk-free Interest Rate		Dividend Yield		Expected Life (Years)	Volatility		SAR Grant Price	Fair Value of SAR
March 2021 Grant	184,641	0.91	%	—	%	6.0	61.9	%	18.58	10.48
March 2022 Grant	312,987	1.67	%	—	%	6.0	60.3	%	12.65	7.20
September 2022 Grant	10,000	3.56	%	—	%	6.0	60.6	%	5.02	2.97
October 2022 Grant	10,000	4.10	%	—	%	6.0	61.3	%	5.26	3.17
December 2022 Grant	10,000	3.75	%	—	%	6.0	62.4	%	6.15	3.72
March 2023 Grant	404,594	4.20	%	—	%	6.0	62.6	%	7.45	4.56
May 2023 Grant	48,427	3.48	%	—	%	6.0	63.0	%	9.31	5.64

SARs activity for the year ended December 31, 2023 was as follows:



	Number of Shares	Weighted Average Exercise Price		Aggregate Intrinsic Value (in millions) (b)
















Outstanding, December 31, 2022	2,091,862	$	14.68	$	0.0
Granted	453,021	7.65

Forfeited/Expired	(241,865)	17.37
Outstanding, December 31, 2023	2,303,018	$	13.01	$	1.3

(b) Intrinsic value is defined as the difference between the current market value and the exercise price, for those SARs where the market price exceeds the exercise price.

There were no SARs exercised in 2023. The was no intrinsic value for the SARs exercised in 2022, as the exercisable price exceeded the market value. The intrinsic value for SARS exercised in 2021 was $0.6 million.

The following table summarizes information related to outstanding and exercisable SARs at December 31, 2023:


	SARs Outstanding					SARs Exercisable
Range of Exercisable Prices	Vested	Non-vested	Weighted-Average Exercise Price per Share		Weighted-Average Remaining Contractual Life in Years	Number Exercisable	Weighted-Average Exercise Price per Share
$5.02 - $13.70	961,955	559,029	$	9.42	6.23	961,955	$	9.85
$16.53 - $22.70	569,276	39,275	18.65		3.72	569,276	18.65
$23.25 - $26.92	173,483	—	24.69		0.46	173,483	24.69
	1,704,714	598,304	$	13.01	5.13	1,704,714	$	14.30

Total compensation expense from continuing operations related to SARs was $1.5 million, $1.5 million and $1.8 million for the years ended December 31, 2023, 2022 and 2021, respectively. At December 31, 2023, total unrecognized compensation expense related to non-vested SARs was $2.1 million, which will be recognized over a weighted average period of 1.9 years.

Weighted-average grant date fair value of non-vested SARs for the year ended December 31, 2023 was as follows:


	Number of Shares	Weighted-Average Grant Date Fair Value


















Non-vested shares, December 31, 2022	470,471	$	6.16
Granted	453,021	4.68
Vested	(276,566)	5.19
Forfeited	(48,622)	5.76
Non-vested shares, December 31, 2023	598,304	$	5.51

Performance Share Units

The Board approves the granting of PSUs to officers and certain key employees that may be earned based on the Company's total shareholder return over the three-year performance period. PSUs are paid out at the end of each performance period based on the Company’s performance, which is measured by determining the percentile rank of the total shareholder return of the Company's common stock in relation to the total shareholder return of a specific peer group of companies. The peer group of companies utilized is the S&P Smallcap 600 Industrials Index. The payment of PSUs following the performance period will be based in accordance with the scale set forth in the PSU agreements, and may range from 0% to 200% of the initial grant. PSUs do not have an option for cash payment.

Under the 2013 Plan, the Company granted the following shares presented in the table below and estimated the fair value of these grants on the grant date using a Monte Carlo pricing model with the following assumptions:


	PSUs Issued
	Number of Shares Granted	Risk-free Interest rate		Dividend Yield		Expected Life (Years)	Volatility		Fair Value per PSU
March 2021 Grant	316,959	0.25	%	—	%	2.83	50.7	%	$	25.38
March 2022 Grant	500,624	1.59	%	—	%	2.83	50.4	%	$	16.54
March 2023 Grant	758,965	4.67	%	—	%	2.82	43.9	%	$	10.91
May 2023 Grant	29,337	3.75	%	—	%	2.65	41.5	%	$	15.24

Total compensation expense from continuing operations related to PSUs was $5.8 million, $4.2 million and $5.1 million for the years ended December 31, 2023, 2022 and 2021, respectively. At December 31, 2023, total unrecognized compensation expense related to non-vested PSUs was $7.2 million, which will be recognized over a weighted average period of 1.7 years.

A summary of the Company's non-vested PSU activity during the year ending December 31, 2023 was as follows:



	Number of Shares	Weighted-Average Grant Date Fair Value




























Non-vested shares, December 31, 2022	661,952	$	19.94
Granted	788,302	11.07
Vested, not issued (a)	(225,667)	25.38


Forfeited	(116,331)	16.63
Non-vested shares, December 31, 2023	1,108,256	$	12.87

(a) The measurement period for PSUs issued in 2021 ended on December 31, 2023 and these shares vested but will not be issued until the Board certifies the measurement period results in early 2024. A total of 0 shares are expected to be issued.

Other Stock Grants

In connection with the Company's appointment of its interim Senior Vice President and Chief Financial Officer ("ICFO") in August 2022, a monthly common stock grant equal to $0.1 million determined at the closing price of the Company's common stock on the last trading day of each month was issued as part of the ICFO's compensation through the end of his service date in October 2023. During the year ended December 31, 2023, the Company issued 124,106 shares at a weighted average price of $7.64 per share and total compensation expense of $0.9 million.

Accounts Receivable and Note Receivable - Schedule of Changes in Provisions For Allowance For Credit Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Receivables [Abstract]
Provision for expected credit losses related to trade accounts receivable	$ 7,039	$ 403	$ 589

Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 491,762	$ 487,737
Accumulated Amortization	166,901	135,577
Intangible assets, net	324,861	352,160
Amortization expense for intangible assets	28,600	31,100	$ 32,200
Estimated amortization expense for the next five years
2024	28,000
2025	27,800
2026	25,900
2027	24,600
2028	23,000
Customer related
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	97,963	95,573
Accumulated Amortization	64,040	54,482
Permits
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	309,679	309,177
Accumulated Amortization	66,733	50,703
Technology related
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	21,803	20,800
Accumulated Amortization	17,001	15,491
Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	30,409	30,212
Accumulated Amortization	11,816	9,198
Air rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	26,139	26,139
Accumulated Amortization	3,281	2,411
Patents
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	206	189
Accumulated Amortization	178	155
Non-compete agreement
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,500	2,500
Accumulated Amortization	2,344	1,718
Other
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	3,063	3,147
Accumulated Amortization	$ 1,508	$ 1,419

Commitments and Contingencies (Details) R$ in Millions			1 Months Ended	3 Months Ended		12 Months Ended
Commitments and Contingencies (Details) R$ in Millions	Dec. 06, 2018 USD ($)	Jun. 04, 2018 USD ($)	Aug. 31, 2005 USD ($)	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) claim case	Dec. 31, 2023 BRL (R$) claim	Mar. 22, 2022 USD ($)	Feb. 25, 2022 EUR (€)	Nov. 23, 2021 USD ($)	Oct. 14, 2021 EUR (€)	Dec. 30, 2020 USD ($)
Commitments and Contingencies
Proposed civil penalty				$ 775,000						$ 390,092
Payments for environmental loss				$ 700,000	$ 270,000
Accrual for Environmental Loss Contingencies						$ 5,300,000
Penalties per day								$ 3,000,000	€ 5,000		€ 100,000
Malpractice Insurance, Deductible						$ 5,000,000
EnvironmentalLossContingencyStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag						Company’s results of operations
Penalty Liability						$ 600,000
Penalties						$ 6,600,000	R$ 32.0
Other
Commitments and Contingencies
Number of pending claims \| claim						17,000	17,000
Loss provision						$ 0
Loss Contingency, Claims Dismissed, Number \| case						28,500
Sao Paulo State Revenue Authority \| Value-Added Tax Assessments January 2004 To May 2005
Commitments and Contingencies
Loss Contingency, Damages Sought, Principal Amount		$ 1,300,000				$ 1,300,000
Estimated claims or assessment, additional amount		$ 7,600,000				19,100,000
Sao Paulo State Revenue Authority \| Value-Added Tax Assessments January 2002 To December 2003
Commitments and Contingencies
Loss Contingency, Damages Sought, Principal Amount			$ 1,200,000
Estimated claims or assessment, additional amount	$ 5,700,000		4,000,000
Loss Contingency, Damages Sought, Value	$ 600,000		$ 5,200,000
Loss provision						0
Brazil
Commitments and Contingencies
Loss Contingencies, Unpaid Service Taxes												$ 2,200,000
Loss Contingencies, Overall Liability						$ 5,900,000

Acquisitions and Dispositions - Schedule of Balance Sheet from Disposal of Harsco Rail Segment (Details) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total Rail liabilities included in Liabilities of assets held-for-sale	$ 172,036	$ 159,004
Discontinued Operations, Held-for-sale \| Harsco Rail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Trade accounts receivable, net	57,415	41,049
Other receivables	6,708	4,037
Inventories	103,077	105,256
Current portion of contract assets	56,341	84,848
Other current assets	31,692	30,950
Property, plant and equipment, net	44,749	41,004
Right-of-use assets, net	7,050	5,635
Goodwill	13,026	13,026
Intangible assets, net	2,486	2,746
Deferred income tax assets	827	6,887
Noncurrent portion of contract assets	22,048	0
Other assets	744	807
Total Rail assets included in Assets held-for-sale	346,163	336,245
Accounts payable	44,703	49,083
Accrued compensation	6,056	1,211
Current portion of operating lease liabilities	3,656	2,635
Other current liabilities	32,912	45,037
Reserve for contracts	52,725	32,246
Current portion of advances on contracts	31,984	28,793
Operating lease liabilities	3,331	3,121
Deferred tax liabilities	204	5,480
Other liabilities	494	861
Total Rail liabilities included in Liabilities of assets held-for-sale	$ 176,065	$ 168,467

Audit Information	12 Months Ended
Audit Information	Dec. 31, 2023
Auditor Information [Abstract]
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Philadelphia, Pennsylvania
Auditor Firm ID	238

Components of Accumulated Other Comprehensive Loss (Details 2) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Revenues		$ 2,069,225	$ 1,889,065	$ 1,848,399
Interest expense		(103,872)	(75,156)	(63,235)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax				(25,863)
Total costs and expenses		1,958,211	1,946,408	1,760,023
Income from continuing operations before income taxes		(18,550)	(122,958)	37,506
Income Tax Expense (Benefit)		28,185	10,381	9,089
Income (loss) from discontinued businesses	$ 5,100
Net income (loss)		88,098	176,431	$ (2,729)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Actuarial losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Pension and Other Postretirement Benefits Cost (Reversal of Cost)		18,917	17,792
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Total costs and expenses		19,394	18,389
Income Tax Expense (Benefit)		(1,170)	(1,218)
Net income (loss)		18,224	17,171
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Pension and Other Postretirement Benefits Cost (Reversal of Cost)		519	534
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Settlement/curtailment gain
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Pension and Other Postretirement Benefits Cost (Reversal of Cost)		(42)	(33)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Settlement/curtailment gain \| Discontinued Operations
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Pension and Other Postretirement Benefits Cost (Reversal of Cost)		0	96
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income Tax Expense (Benefit)		247	(960)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Accumulated Foreign Currency Adjustment Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income (loss) from discontinued businesses		(507)	0
Net income (loss)		(507)	0
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Foreign currency exchange forward contracts \| Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Revenues		1,638	(1,746)
Income from continuing operations before income taxes		(938)	2,499
Net income (loss)		(691)	1,539
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Interest rate swaps \| Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Interest expense		$ 2,576	$ (4,245)

Accounts Receivable and Note Receivable - AR Facility (Details) - P N C Member - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Upon execution in June 2022	$ 0	$ 120,000
Additional proceeds	5,000	25,000
Total received	$ 5,000	$ 145,000

Leases (Tables)

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Lease, Cost [Table Text Block]

The components of lease expense were as follows:


(In thousands)	2023		2022		2021
Finance leases:
Depreciation expense	$	7,957	$	3,938	$	2,510
Interest on lease liabilities	2,036		784		495
Operating leases	34,735		33,773		32,544
Variable and short-term leases	52,200		49,811		47,780
Sublease income	(7)		(6)		(53)
Total lease expense from continuing operations	$	96,921	$	88,300	$	83,276

Supplemental cash flow information related to leases was as follows:


(In thousands)	2023		2022		2021
Cash paid for amounts included in the measurement of lease liabilities:
Cash flows used by operating activities - Operating leases (a)	$	37,880	$	34,420	$	33,645
Cash flows used by operating activities - Finance leases	1,914		798		517
Cash flows used by financing activities - Finance leases	7,736		3,975		2,330
ROU assets obtained in exchange for lease obligations:
Operating leases	$	27,951	$	32,817	$	42,442
Finance leases	27,128		11,175		11,495

(a) Cash flows include cash paid for operating leases of discontinued operations.

Supplemental balance sheet information related to leases was as follows:


(In thousands)	2023		2022
Operating Leases:
Operating lease ROU assets	$	95,841	$	101,253
Current portion of operating lease liabilities	25,119		25,521
Operating lease liabilities	72,145		75,246
Finance Leases:
Property, plant and equipment, net	$	43,151	$	23,671
Current maturities of long-term debt	9,723		5,562
Long-term debt	33,911		18,832

Supplemental additional information related to leases was as follows:


	2023		2022
Other information:
Weighted average remaining lease term - Operating leases (in years)	7.36		7.42
Weighted average remaining lease term - Finance leases (in years)	5.33		5.35
Weighted average incremental borrowing rate - Operating leases	6.3	%	6.0	%
Weighted average incremental borrowing rate - Finance leases	6.4	%	5.2	%

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

Maturities of lease liabilities were as follows:


(In thousands)	Operating Leases		Finance Leases
Year Ending December 31:
2024	$	30,134	$	12,154
2025	23,486		10,531
2026	17,774		9,197
2027	11,740		7,426
2028	7,209		5,542
After 2028	34,524		6,869
Total lease payments	124,867		51,719
Less: Imputed interest	(27,603)		(8,085)
Total lease liabilities	$	97,264	$	43,634

Finance Lease, Liability, Maturity [Table Text Block]

Maturities of lease liabilities were as follows:


(In thousands)	Operating Leases		Finance Leases
Year Ending December 31:
2024	$	30,134	$	12,154
2025	23,486		10,531
2026	17,774		9,197
2027	11,740		7,426
2028	7,209		5,542
After 2028	34,524		6,869
Total lease payments	124,867		51,719
Less: Imputed interest	(27,603)		(8,085)
Total lease liabilities	$	97,264	$	43,634

Employee Benefit Plans (Details) - Pension Plan - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
U.S. Plans
Defined Contribution Plan [Abstract]
Discretionary contributions	$ 0	$ 0	$ 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0	0	0
Interest cost	10,173,000	5,716,000	4,813,000
Expected return on plan assets	(7,000,000)	(10,795,000)	(12,199,000)
Recognized prior service costs	0	0	0
Recognized losses	4,601,000	4,732,000	5,538,000
Settlement/curtailment loss (gain)	0	0	0
Defined benefit plans pension cost	7,774,000	(347,000)	(1,848,000)
Multiemployer plans	595,000	642,000	640,000
Defined contribution plans	6,656,000	5,401,000	5,660,000
Net periodic pension cost, U.S. Plans	$ 15,025,000	5,696,000	4,452,000
U.S. Plans \| Maximum
Defined Contribution Plan [Abstract]
Employer matching contribution (as a percent)	4.00%
International Plans
Defined Contribution Plan [Abstract]
Additional contribution towards insurance and administrative costs (as a percent)	2.00%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 1,221,000	1,867,000	1,805,000
Interest cost	30,166,000	16,500,000	12,652,000
Expected return on plan assets	(31,198,000)	(38,891,000)	(45,018,000)
Recognized prior service costs	519,000	534,000	582,000
Recognized losses	14,316,000	13,060,000	18,119,000
Settlement/curtailment loss (gain)	(42,000)	(33,000)	(6,000)
Defined benefit plans pension cost	14,982,000	(6,963,000)	(11,866,000)
Multiemployer plans	1,209,000	1,114,000	1,035,000
Defined contribution plans	4,123,000	4,122,000	4,196,000
Net periodic pension cost, International Plans	$ 20,314,000	$ (1,727,000)	$ (6,635,000)
International Plans \| Maximum
Defined Contribution Plan [Abstract]
Employer matching contribution (as a percent)	6.00%

Acquisitions and Dispositions - Summary of Cash Flow Information from Disposal of Harsco Rail Segment (Details) - Discontinued Operations, Held-for-sale - Harsco Rail - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Depreciation and amortization	$ 0	$ 0	$ 4,329
Purchases of property, plant and equipment	$ 2,453	$ 1,618	$ 1,406

Inventories (Tables)

12 Months Ended

Dec. 31, 2023

Inventory Disclosure [Abstract]

Schedule of inventories

Inventories consist of the following:



(In thousands)	December 31 2023		December 31 2022
Finished goods	$	15,565	$	11,809
Work-in-process	1,114		2,030
Raw materials and purchased parts	23,542		27,946
Stores and supplies	46,071		39,590
Total inventories	$	86,292	$	81,375
Valued at lower of cost or market:
LIFO basis	$	10,532	$	15,473
FIFO basis	9,265		8,826
Average cost basis	66,495		57,076
Total inventories	$	86,292	$	81,375

Other Expenses (Tables)

12 Months Ended

Dec. 31, 2023

Other Income and Expenses [Abstract]

Schedule of other expenses (income)

The major components of this Consolidated Statements of Operations caption, broken out by operating segment, are as follows:



(In thousands)	2023		2022		2021
Net gains
Harsco Environmental Segment	$	(250)	$	(1,869)	$	(8,902)
Clean Earth Segment	—		(1,512)		—
Corporate	—		(632)		—
Total net gains	(250)		(4,013)		(8,902)
Employee termination benefit costs
Harsco Environmental Segment	1,977		4,998		2,852
Clean Earth Segment	1,399		1,786		433
Corporate	275		(294)		1,481
Total employee termination benefit costs	3,651		6,490		4,766
Other costs (income) to exit activities
Harsco Environmental Segment	(7,810)		39		640
Clean Earth Segment	—		—		23
Corporate	2,692		1,407		—
Total other costs (income) to exit activities	(5,118)		1,446		663
Asset impairments
Harsco Environmental Segment	88		582		942
Clean Earth Segment	—		59		63

Total asset impairments	88		641		1,005
Contingent consideration adjustments

Clean Earth Segment	—		(827)		—
Corporate	(848)		—		—
Total contingent consideration adjustments	(848)		(827)		—
Other (income) expense	(742)		1,000		(1,254)
Total other (income) expenses, net	$	(3,219)	$	4,737	$	(3,722)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, deferred income taxes	$ 3,162	$ (6,752)	$ (23)
Net gains (losses) on cash flow hedging instruments, deferred income taxes	138	(1,284)	(797)
Pension liability adjustments, deferred income taxes	(2,693)	(2,590)	(5,409)
Unrealized gain (loss) on marketable securities, deferred income taxes	$ (2)	$ 4	$ (12)

Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair value of outstanding derivative contracts recorded as assets and liabilities

The fair value of outstanding derivative contracts recorded as assets and liabilities on the Company's Consolidated Balance Sheets was as follows:


(In thousands)	Balance Sheet Location	Fair Value of Derivatives Designated as Hedging Instruments		Fair Value of Derivatives Not Designated as Hedging Instruments		Total Fair Value
December 31, 2023
Asset derivatives (Level 2):
Foreign currency exchange forward contracts	Other current assets	$	77	$	1,597	$	1,674
Interest rate swaps	Other current assets	1,443		—		1,443

Total		$	1,520	$	1,597	$	3,117
Liability derivatives (Level 2):
Foreign currency exchange forward contracts	Other current liabilities	$	561	$	8,064	$	8,625

Interest rate swaps	Other liabilities	2,150		—		2,150
Total		$	2,711	$	8,064	$	10,775
December 31, 2022
Asset derivatives (Level 2):
Foreign currency exchange forward contracts	Other current assets	$	1,042	$	2,154	$	3,196




Total		$	1,042	$	2,154	$	3,196
Liability derivatives (Level 2):
Foreign currency exchange forward contracts	Other current liabilities	$	577	$	4,796	$	5,373


Total		$	577	$	4,796	$	5,373

Derivative Instruments, Gain (Loss) [Table Text Block]

The effect of derivative instruments on the Company's Consolidated Statements of Operations and the Consolidated Statements of Comprehensive Income (Loss) was as follows:

Derivatives Designated as Hedging Instruments


	Amount Recognized in OCI on Derivatives						Amount Reclassified from AOCI into Income - Effective Portion or Equity
(In thousands)	2023		2022		2021		2023		2022		2021

Foreign currency exchange forward contracts	$	(1,696)	$	1,966	$	309	$	1,638	$	(1,746)	$	(129)

Interest rate swaps	1,869		—		(42)		(2,576)		4,245		3,474

	$	173	$	1,966	$	267	$	(938)	$	2,499	$	3,345

Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]

The locations and amounts of gain (loss) recognized on the Consolidated Statements of Operations are as follows:


	2023
(in thousands)	Interest Expense		Income (Loss) from Discontinued Businesses
Total amounts in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded	$	(103,872)	$	(39,252)
Interest rate swaps:
Gain or (loss) reclassified from AOCI into income	2,576		—

Foreign exchange contracts:
Gain or (loss) reclassified from AOCI into income	—		(1,638)


	2022
(in thousands)	Interest Expense		Income (Loss) From Discontinued Businesses
Total amounts in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded	$	(75,156)	$	(50,301)
Interest rate swaps:
Gain or (loss) reclassified from AOCI into income	(4,245)		—
Amount recognized in earnings due to ineffectiveness	1,862		—
Foreign exchange contracts:
Gain or (loss) reclassified from AOCI into income	—		1,746


	2021
		Interest Expense		Income (Loss) From Discontinued Businesses
Total amounts in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded		$	(63,235)	$	(25,863)
Interest rate swaps:
Gain or (loss) reclassified from AOCI into income		(3,474)		—
Amount recognized in earnings due to ineffectiveness		89		—
Foreign exchange contracts:
Gain or (loss) reclassified from AOCI into income		—		129

Derivatives Not Designated as Hedging Instruments


	Location of Gain (Loss) Recognized in Income on Derivatives	Amount of Gain (Loss) Recognized in Income on Derivatives for the Twelve Months Ended December 31(a)
(In thousands)		2023		2022		2021
Foreign currency exchange forward contracts	Cost of sales	$	426	$	19,808	$	10,761

(a) These gains (losses) offset amounts recognized in cost of sales sold principally as a result of intercompany or third-party foreign currency exposures.

- Definition

Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item.

+ References + Details

Information by Segment and Geographic Area

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Information by Segment and Geographic Area

The Company reports information about operating segments using the "management approach," which is based on the way management organizes and reports the segments within the enterprise for making operating decisions and assessing performance. The Company's reportable segments are identified based upon differences in products, services and markets served. In 2023, the Company had two reportable segments. These segments and the types of products and services offered include the following:

Harsco Environmental

HE provides environmental services and material processing to the global steel and metals industries. HE partners with its global customer base to deliver production-critical on-site operational support and resource recovery services, through management of its customers’ primary waste or byproduct streams. HE's services support the metal manufacturing process, generating significant operational and financial efficiencies for its customers and allowing them to focus on their core steelmaking businesses. In addition, HE creates value-added downstream products from industrial waste streams.

Clean Earth

CE is one of the largest specialty waste processing companies in the U.S., providing processing and beneficial reuse solutions for hazardous wastes, and soil and dredged materials.

Other Information

The measurement basis of segment profit or loss is operating income. There are no significant inter-segment sales. Corporate assets, at December 31, 2023 and 2022, include principally cash, prepaid taxes, fair value of derivative instruments and U.S. deferred income taxes. Countries with revenues from unaffiliated customers or net PP&E of ten percent or more of the consolidated totals (in at least one period presented) are as follows:

Information by Geographic Area (a)


	Revenues from Unaffiliated Customers
	Years ended December 31
(In thousands)	2023		2022		2021
U.S.	$	1,191,369	$	1,075,355	$	1,008,689


All Other	877,856		813,710		839,710
Totals including Corporate	$	2,069,225	$	1,889,065	$	1,848,399

(a) Revenues are attributed to individual countries based on the location of the facility generating the revenue.


	Property, Plant and Equipment, Net
	December 31
(In thousands)	2023		2022
U.S.	$	303,839	$	283,864
China	69,691		96,095


All Other	289,754		276,916
Totals including Corporate	$	663,284	$	656,875

No customer provided in excess of 10% of the Company's consolidated revenues in 2023, 2022 and 2021.

In 2023, 2022 and 2021, HE had one customer that provided in excess of 10% of its revenues under multiple long-term contracts at several mill sites. Should additional consolidations occur involving some of the steel industry's larger companies which are customers of the Company, it would result in an increase in concentration of credit risk for the Company. The loss of any one of the contracts would not have a material adverse effect upon the Company's financial position or cash flows; however, it could have a significant effect on quarterly or annual results of operations.

In 2023, 2022, and 2021, CE had one customer that provided in excess of 10% of its revenue. The loss of this customer would not have a material adverse impact on the Company's financial positions or cash flows; however, it could have a material effect on quarterly or annual results of operations.

Operating Information by Segment:



	Years ended December 31
(In thousands)	2023		2022		2021
Revenues
Harsco Environmental	$	1,140,904	$	1,061,239	$	1,068,083
Clean Earth	928,321		827,826		780,316

Total Revenues	$	2,069,225	$	1,889,065	$	1,848,399
Operating Income (Loss)
Harsco Environmental	$	77,635	$	59,559	$	103,402
Clean Earth	76,974		(81,785)		25,639
Corporate	(43,595)		(35,117)		(40,665)
Total Operating Income (Loss)	$	111,014	$	(57,343)	$	88,376
Total Assets
Harsco Environmental	$	1,417,278	$	1,416,717	$	1,386,087
Clean Earth	981,723		980,774		1,278,472
Corporate	109,388		57,118		56,086
Discontinued Operations	346,163		336,245		333,263
Total Assets	$	2,854,552	$	2,790,854	$	3,053,908
Depreciation
Harsco Environmental	$	113,571	$	108,880	$	105,830
Clean Earth	23,252		18,836		19,672
Corporate	2,133		1,996		1,900
Total Depreciation	$	138,956	$	129,712	$	127,402
Amortization
Harsco Environmental	$	4,030	$	6,809	$	8,052
Clean Earth	24,583		24,299		24,180
Corporate (b)	3,795		3,029		2,710
Total Amortization	$	32,408	$	34,137	$	34,942
Capital Expenditures
Harsco Environmental	$	104,045	$	109,508	$	137,228
Clean Earth	32,100		21,996		18,403
Corporate	427		4,038		1,289
Total Capital Expenditures	$	136,572	$	135,542	$	156,920

(b) Amortization expense on Corporate relates to the amortization of deferred financing costs.

Reconciliation of Segment Operating Income to Consolidated Income (Loss) From Continuing Operations Before Income Taxes and Equity Income:



	Years ended December 31
(In thousands)	2023		2022		2021
Segment operating income (loss)	$	154,609	$	(22,226)	$	129,041
General Corporate expense	(43,595)		(35,117)		(40,665)
Operating income (loss) from continuing operations	111,014		(57,343)		88,376
Interest income	6,670		3,559		2,231
Interest expense	(103,872)		(75,156)		(63,235)
Defined benefit pension income (expense)	(21,600)		8,938		15,640
Facility fees and debt-related income (expense)	(10,762)		(2,956)		(5,506)
Income (loss) from continuing operations before income taxes and equity income	$	(18,550)	$	(122,958)	$	37,506

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-15

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-31

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-42

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-40

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//280/tableOfContent

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 26
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-26

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-34

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

+ Details

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income (loss)	$ (88,098)	$ (176,431)	$ 2,729
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Depreciation	138,956	129,712	131,449
Amortization	32,408	34,137	35,224
(Gain) loss on early extinguishment of debt	0	(2,254)	2,668
Deferred income tax expense (benefit)	1,066	(12,029)	(16,930)
Equity (income) loss of unconsolidated entities, net	761	178	302
Dividends from unconsolidated entities	0	526	269
Goodwill and other intangible asset impairment charges	0	119,580	0
Property, plant and equipment impairment charge	14,099	0	0
Other, net	10,167	(427)	2,062
Changes in assets and liabilities:
Accounts receivable	(38,889)	94,317	(19,781)
Income tax refunds receivable from acquisition, reimbursable to seller	0	7,687	2,870
Inventories	(3,410)	(16,798)	(7,783)
Contract assets	3,475	11,543	(43,510)
Right-of-use-assets	32,479	29,171	28,300
Accounts payable	(5,090)	19,264	14,118
Accrued interest payable	221	(643)	(411)
Accrued compensation	33,871	(3,945)	6,469
Advances on contracts and other customer advances	(14,160)	(11,347)	(14,311)
Operating lease liabilities	(30,698)	(28,374)	(27,307)
Retirement plan liabilities, net	(3,968)	(34,136)	(45,786)
Other assets and liabilities	31,258	(9,204)	21,556
Net cash provided (used) by operating activities	114,448	150,527	72,197
Cash flows from investing activities:
Purchases of property, plant and equipment	(139,025)	(137,160)	(158,326)
Purchase of businesses, net of cash acquired*	0	0	0
Proceeds from sales of assets	6,991	10,759	16,724
Expenditures for intangible assets	(503)	(184)	(358)
Proceeds from notes receivable	11,238	8,605	6,400
Payments for settlement of interest rate swaps	0	(2,304)	0
Net proceeds (payments) from settlement of foreign currency forward exchange contracts	4,251	20,950	10,940
Other investing activities, net	463	273	171
Net cash used by investing activities	(116,585)	(99,061)	(124,449)
Cash flows from financing activities:
Short-term borrowings, net	7,027	884	935
Current maturities and long-term debt:
Additions	201,997	224,445	540,663
Reductions	(164,475)	(256,310)	(464,848)
Dividends paid to noncontrolling interests	(5)	(4,841)	(3,103)
Sale of noncontrolling interests	0	1,901	0
Contributions from noncontrolling interests	1,654	0	0
Stock-based compensation - Employee taxes paid	(1,426)	(1,949)	(3,392)
Payment of contingent consideration	0	(6,915)	(1,588)
Deferred financing costs	0	0	(7,828)
Other financing activities, net	0	0	(601)
Net cash (used) provided by financing activities	44,772	(42,785)	60,238
Effect of exchange rate changes on cash, including restricted cash	(3,115)	(10,715)	(527)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	39,520	(2,034)	7,459
Cash and cash equivalents, including restricted cash, at beginning of period	85,094	87,128	79,669
Cash and cash equivalents, including restricted cash, at end of period	124,614	85,094	87,128
Supplemental Cash Flow Information [Abstract]
Change in accrual for purchases of property, plant and equipment included in accounts payable	(7,579)	10,845	4,253
Purchase of businesses, net of cash acquired
Working capital	0	0	532
Property, plant and equipment	0	0	823
Goodwill	0	0	(1,232)
Other noncurrent assets and liabilities, net	0	0	(123)
Net cash used to acquire businesses	$ 0	$ 0	$ 0

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Common stock, par value (usd per share)	$ 1.25	$ 1.25
Common stock, shares issued	116,884,011	116,358,520	115,906,393	115,430,042
Treasury stock (in shares)	37,049,176	36,868,880	36,690,847	36,505,672

Leases - Narrative (Details) $ in Thousands	12 Months Ended
Leases - Narrative (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Minimum
Operating Leased Assets [Line Items]
Operating And Finance Leases, Excluding Short Term Leases, Weighted-Average Remaining Lease Term	1 year
Maximum
Operating Leased Assets [Line Items]
Operating And Finance Leases, Excluding Short Term Leases, Weighted-Average Remaining Lease Term	27 years
Clean Earth
Operating Leased Assets [Line Items]
Finance lease obligations, not yet commenced	$ 49,000

Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenue from Contract with Customer [Abstract]
Total contract assets	$ 8,500	$ 5,300
Revenue recognized in excess of amounts reclassified to trade accounts receivable, net	5,600	6,800
Contract with Customer, Liability, Revenue Recognized	6,500
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	2,069,225	1,889,065	$ 1,848,399
Waste Processing and Reuse Solutions [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	767,338	681,804	639,233
Aluminum Dross and Scrap Processing Systems [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	27,652	14,902	15,114
Environmental services related to resource recovery for metals manufacturing; and related logistical services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	950,961	900,426	920,580
Applied Products [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	162,291	145,911	132,389
Soil and dredged material
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	160,983	146,022	141,083
Operating Segments [Member] \| Clean Earth
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	928,321	827,826	780,316
Operating Segments [Member] \| Harsco Environmental
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	1,140,904	1,061,239	1,068,083
Operating Segments [Member] \| Waste Processing and Reuse Solutions [Member] \| Clean Earth
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	767,338	681,804	639,233
Operating Segments [Member] \| Waste Processing and Reuse Solutions [Member] \| Harsco Environmental
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	0	0	0
Operating Segments [Member] \| Aluminum Dross and Scrap Processing Systems [Member] \| Clean Earth
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	0	0	0
Operating Segments [Member] \| Aluminum Dross and Scrap Processing Systems [Member] \| Harsco Environmental
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	27,652	14,902	15,114
Operating Segments [Member] \| Environmental services related to resource recovery for metals manufacturing; and related logistical services \| Clean Earth
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	0	0	0
Operating Segments [Member] \| Environmental services related to resource recovery for metals manufacturing; and related logistical services \| Harsco Environmental
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	950,961	900,426	920,580
Operating Segments [Member] \| Applied Products [Member] \| Clean Earth
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	0	0	0
Operating Segments [Member] \| Applied Products [Member] \| Harsco Environmental
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	162,291	145,911	132,389
Operating Segments [Member] \| Soil and dredged material \| Clean Earth
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	160,983	146,022	141,083
Operating Segments [Member] \| Soil and dredged material \| Harsco Environmental
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	$ 0	$ 0	$ 0

Other Expenses

12 Months Ended

Dec. 31, 2023

Other Income and Expenses [Abstract]

Other Expenses

Other (Income) Expenses, Net

The major components of this Consolidated Statements of Operations caption, broken out by operating segment, are as follows:



(In thousands)	2023		2022		2021
Net gains
Harsco Environmental Segment	$	(250)	$	(1,869)	$	(8,902)
Clean Earth Segment	—		(1,512)		—
Corporate	—		(632)		—
Total net gains	(250)		(4,013)		(8,902)
Employee termination benefit costs
Harsco Environmental Segment	1,977		4,998		2,852
Clean Earth Segment	1,399		1,786		433
Corporate	275		(294)		1,481
Total employee termination benefit costs	3,651		6,490		4,766
Other costs (income) to exit activities
Harsco Environmental Segment	(7,810)		39		640
Clean Earth Segment	—		—		23
Corporate	2,692		1,407		—
Total other costs (income) to exit activities	(5,118)		1,446		663
Asset impairments
Harsco Environmental Segment	88		582		942
Clean Earth Segment	—		59		63

Total asset impairments	88		641		1,005
Contingent consideration adjustments

Clean Earth Segment	—		(827)		—
Corporate	(848)		—		—
Total contingent consideration adjustments	(848)		(827)		—
Other (income) expense	(742)		1,000		(1,254)
Total other (income) expenses, net	$	(3,219)	$	4,737	$	(3,722)

Net Gains

Net gains result from the sales of redundant properties (primarily land, buildings and related equipment) and non-core assets. In 2023, gains related to assets sold principally in Western Europe. In 2022, gains related to assets sold principally in North America. In 2021, gains related to assets sold principally in Western Europe.

Employee Termination Benefit Costs

Costs and the related liabilities associated with involuntary termination benefit costs for one-time benefit arrangements provided as part of an exit or disposal activity are recognized when a formal plan for reorganization is approved at the appropriate level of management and is communicated to the affected employees. Additionally, costs associated with ongoing benefit arrangements, or in certain countries where statutory requirements dictate a minimum required benefit, are recognized when they are probable and estimable. The employee termination benefit costs in 2023 principally related to HE primarily in Western Europe and CE in North America. The employee termination benefit costs in 2022 principally related to HE primarily in Western Europe and CE in North America. The employee termination benefit costs in 2021 principally related to HE primarily in Western Europe and Asia-Pacific; and Corporate primarily in North America.

Other Costs to Exit Activities

Costs associated with exit or disposal activities include costs to terminate a contract and other costs associated with exit or disposal activities. Costs to terminate a contract are recognized when an entity terminates the contract or when an entity ceases using the right conveyed by the contract. This includes the costs to terminate the contract before the end of its term or the costs that will continue to be incurred under the contract for its remaining term without economic benefit to the entity. Other costs associated with exit or disposal activities (e.g., costs to consolidate or close facilities and relocate equipment or employees) are recognized and measured at their fair value in the period in which the liability is incurred. In 2023, exit income was incurred principally in HE, mostly due to a $8.1 million net gain in North America related to a lease modification that resulted in a lease incentive for the Company to relocate a site prior to the end of the expected lease term. In 2022, exit costs were incurred principally in HE, mostly in Middle East/Africa. In 2021, exit costs were incurred principally in HE, mostly in North America.

Asset Impairments

Asset impairments include impairment charges for long-lived assets, other than definite-lived intangibles, and are measured as the amount by which the carrying amount of assets exceeds their fair value. Fair value is estimated based upon the expected future realizable discounted cash flows including anticipated selling prices. Non-cash impaired asset write-downs, for long-lived assets other than definite-lived intangibles, are included in, Other, net, on the Consolidated Statements of Cash Flows as adjustments to reconcile net income (loss) to net cash provided by operating activities. In all years presented, impaired asset write-downs were incurred primarily in HE across several regions.

Contingent Consideration Adjustments

The Company acquired Clean Earth in 2019. Included in liabilities acquired was a contingent liability resulting from a prior Clean Earth acquisition. Each quarter, until settlement of the related contingencies, the Company assesses the likelihood that the acquired businesses will achieve performance goals and the resulting fair value of the contingent consideration and any future adjustments (increases or decreases) are included in operating results. In 2022, CE recorded an adjustment related to the contingent consideration to release the remaining liability. In 2023, the Company recorded an adjustment related to expected reimbursement of net operating losses that did not occur.

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock Issued	Treasury	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Balances at Dec. 31, 2020	$ 713,399	$ 144,288	$ (843,230)	$ 204,078	$ 1,797,759	$ (645,741)	$ 56,245
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	2,729				(3,249)		5,978
Cash dividends declared:
Noncontrolling interests	(3,116)						(3,116)
Total other comprehensive income (loss)	84,105					85,602	(1,497)
Stock appreciation rights exercised	(376)	58	(376)	(58)
Vesting of restricted stock units and other stock grants	(1,983)	382	(1,983)	(382)
Vesting of performance share units	(1,033)	155	(1,033)	(155)
Amortization of unearned stock-based compensation, net of forfeitures	12,045			12,045
Balances at Dec. 31, 2021	805,770	144,883	(846,622)	215,528	1,794,510	(560,139)	57,610
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(176,431)				(180,069)		3,638
Cash dividends declared:
Noncontrolling interests	(4,841)						(4,841)
Total other comprehensive income (loss)	(11,607)					(7,497)	(4,110)
Proceeds from (Payments to) Noncontrolling Interests	1,901						1,901
Strategic venture exit	(598)						(598)
Stock appreciation rights exercised	(66)	29	(66)	(29)
Vesting of restricted stock units and other stock grants	(1,882)	536	(1,882)	(536)
Amortization of unearned stock-based compensation, net of forfeitures	10,796			10,796
Balances at Dec. 31, 2022	623,042	145,448	(848,570)	225,759	1,614,441	(567,636)	53,600
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(88,098)				(86,121)		(1,977)
Cash dividends declared:
Noncontrolling interests	(5)						(5)
Total other comprehensive income (loss)	27,325					27,942	(617)
Purchase of subsidiary shares from noncontrolling interest	0			398			(398)
Proceeds from (Payments to) Noncontrolling Interests	1,654						1,654
Vesting of restricted stock units and other stock grants	(1,426)	657	(1,426)	(657)
Amortization of unearned stock-based compensation, net of forfeitures	12,916			12,916
Balances at Dec. 31, 2023	$ 575,408	$ 146,105	$ (849,996)	$ 238,416	$ 1,528,320	$ (539,694)	$ 52,257

Accounts Receivable and Note Receivable - Factoring Agreements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Receivables [Abstract]
Receivables Sold under Factoring Agreement	$ 16,100	$ 17,300
Receivables Sold under Factoring Agreement, Program Capacities	$ 32,600	$ 31,400

Inventories

12 Months Ended

Dec. 31, 2023

Inventory Disclosure [Abstract]

Inventories

Inventories consist of the following:



(In thousands)	December 31 2023		December 31 2022
Finished goods	$	15,565	$	11,809
Work-in-process	1,114		2,030
Raw materials and purchased parts	23,542		27,946
Stores and supplies	46,071		39,590
Total inventories	$	86,292	$	81,375
Valued at lower of cost or market:
LIFO basis	$	10,532	$	15,473
FIFO basis	9,265		8,826
Average cost basis	66,495		57,076
Total inventories	$	86,292	$	81,375

Inventories valued on a LIFO basis at December 31, 2023 and December 31, 2022 were approximately $13 million and $14 million, respectively, less than the amounts of such inventories valued at current costs. During 2023, there was a $1.2 million favorable impact to Cost of sales as a result of reducing certain inventory quantities valued on a LIFO basis. There was no significant impact during 2022 or 2021.

Capital Stock - Reconciliation of the average shares of common stock used to compute basic earnings per common share to the shares used to compute diluted earnings per common share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of the average shares of common stock used to compute basic earnings per common share to the shares used to compute diluted earnings per common share
Income (loss) from continuing operations attributable to Harsco Corporation common stockholders (in dollars)	$ (45,519)	$ (137,155)	$ 22,137
Weighted average shares of common stock outstanding	79,796	79,493	79,234
Dilutive effect of stock-based compensation (in shares)	0	0	1,055
Weighted-average shares outstanding—diluted (in shares)	79,796	79,493	80,289
Basic (in dollars per share)	$ (0.57)	$ (1.73)	$ 0.28
Diluted (in dollars per share)	$ (0.57)	$ (1.73)	$ 0.28

- Definition

Amount after tax of income (loss) from continuing operations attributable to the parent.

+ References

+ Details

- Definition

The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

- Definition

The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483443/250-10-50-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 260
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+ Details

Components of Accumulated Other Comprehensive Loss

12 Months Ended

Dec. 31, 2023

Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]

Components of Accumulated Other Comprehensive Loss

AOCI is included on the Consolidated Statements of Stockholders' Equity. The components of AOCI, net of the effect of income taxes, and activity for the years ended December 31, 2023 and 2022 are as follows:


	Components of AOCI - Net of Tax
(In thousands)	Cumulative Foreign Exchange Translation Adjustments			Effective Portion of Derivatives Designated as Hedging Instruments			Cumulative Unrecognized Actuarial Losses on Pension Obligations			Unrealized Gain (Loss) on Marketable Securities		Total


Balance at December 31, 2021	$	(134,889)		$	(3,024)		$	(422,248)		$	22	$	(560,139)
OCI before reclassifications	(82,325)		(a)	1,642		(b)	50,378		(c)	(12)		(30,317)
Amounts reclassified from AOCI, net of tax	—			1,539			17,171			—		18,710
Total OCI	(82,325)			3,181			67,549			(12)		(11,607)
Less: OCI attributable to noncontrolling interests	4,110			—			—			—		4,110
OCI attributable to Enviri Corporation	(78,215)			3,181			67,549			(12)		(7,497)
Balance at December 31, 2022	(213,104)			157			(354,699)			10		(567,636)
OCI before reclassifications	29,495		(a)	64		(b)	(19,265)		(c)	5		10,299
Amounts reclassified from AOCI, net of tax	(507)			(691)			18,224			—		17,026
Total OCI	28,988			(627)			(1,041)			5		$	27,325
Less: OCI attributable to noncontrolling interests	617			—			—			—		617
OCI attributable to Enviri Corporation	29,605			(627)			(1,041)			5		27,942
Balance at December 31, 2023	$	(183,499)		$	(470)		$	(355,740)		$	15	$	(539,694)

(a) Principally foreign currency fluctuation.

(b) Principally net change from periodic revaluations.

Amounts reclassified from AOCI for 2023 and 2022 are as follows:


	Year Ended December 31, 2023		Year Ended December 31, 2022		Affected Caption on the Consolidated Statements of Operations
(In thousands)
Amortization of defined benefit pension items (d):
Actuarial losses	$	18,917	$	17,792	Defined benefit pension income (expense)

Prior-service costs	519		534		Defined benefit pension income (expense)

Settlement/curtailment loss (gain)	—		96		Income (loss) from discontinued businesses
Settlement/curtailment gain	(42)		(33)		Defined benefit pension income (expense)
Total before tax	19,394		18,389
Tax benefit	(1,170)		(1,218)
Total reclassification of defined benefit pension items, net of tax	$	18,224	$	17,171



Amortization of cash flow hedging instruments(e):
Foreign currency exchange forward contracts	$	1,638	$	(1,746)	Income (loss) from discontinued businesses


Interest rate swaps	(2,576)		4,245		Interest expense

Total before tax	(938)		2,499
Tax benefit	247		(960)
Total reclassification of cash flow hedging instruments	$	(691)	$	1,539
Recognition of cumulative foreign exchange translation adjustments:
Gain on substantial liquidation of subsidiaries(f)	$	(507)	$	—	Other (income) expenses, net

Total reclassification of cumulative foreign exchange translation adjustments	$	(507)	$	—

(d) These AOCI components are included in the computation of NPPC. See Note 10, Employee Benefit Plans, for additional information.

(e) See Note 15, Financial Instruments for additional information.

(f) No tax impact

Leases - Supplemental Income Statement Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Finance Lease, Right-of-Use Asset, Amortization	$ 7,957	$ 3,938	$ 2,510
Finance Lease, Interest Expense	2,036	784	495
Operating Lease, Cost	34,735	33,773	32,544
Variable Lease, Cost	52,200	49,811	47,780
Sublease Income	(7)	(6)	(53)
Lease, Cost	$ 96,921	$ 88,300	$ 83,276

Accounts Receivable and Note Receivable (Tables)

12 Months Ended

Dec. 31, 2023

Receivables [Abstract]

Schedule of accounts receivable

Accounts receivable consist of the following:



(In thousands)	December 31 2023		December 31 2022
Trade accounts receivable	$	296,291	$	272,775
Less: Allowance for expected credit losses	(15,519)		(8,347)
Trade accounts receivable, net	$	280,772	$	264,428
Other receivables (a)	$	33,857	$	25,379

(a)Other receivables include employee receivables, insurance receivable, tax claims and refunds and other miscellaneous receivables not included in Trade accounts receivable, net.

The following table reflects proceeds the Company received from the AR Facility, which are included in cash flows from operating activities in the Consolidated Statements of Cash Flows:


	Year Ended December 31
(In millions)	2023		2022
Upon execution in June 2022	$	—	$	120.0
Additional proceeds	5.0		25.0
Total received	$	5.0	$	145.0

The following table reflects balances for net amounts sold and program capacities for the arrangements:


(In millions)	December 31 2023		December 31 2022
Net amounts sold under factoring arrangements	$	16.1	$	17.3
Program capacities	32.6		31.4


(In millions)	December 31 2023		December 31 2022
Note receivable, at amortized cost	$	14.0	$	23.9
Note receivable, at fair value	15.4		23.8

Schedule of provision for doubtful accounts related to trade accounts receivable

The provision for expected credit losses related to trade accounts receivable was as follows:


	Years Ended December 31
(In thousands)	2023		2022		2021
Provision for expected credit losses related to trade accounts receivable	$	7,039	$	403	$	589

Leases - Supplemental Lease Information (Details)	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating Lease, Weighted Average Remaining Lease Term	7 years 4 months 9 days	7 years 5 months 1 day
Finance Lease, Weighted Average Remaining Lease Term	5 years 3 months 29 days	5 years 4 months 6 days
Operating Lease, Weighted Average Discount Rate, Percent	6.30%	6.00%
Finance Lease, Weighted Average Discount Rate, Percent	6.40%	5.20%

Financial Instruments - Effect of Derivative Instruments on the Consolidated Statements of Operations and the Consolidated Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	$ (103,872)	$ (75,156)	$ (63,235)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax			(25,863)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(938)	2,499	(3,345)
Foreign currency exchange forward contracts \| Product revenues / Cost of services and products sold
Derivative Not Designated as Hedging Instruments
Amount of Gain (Loss) Recognized in Income on Derivative for the Twelve Months Ended December 31	426	19,808	10,761
Interest rate swaps \| Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	2,576	(4,245)	(3,474)
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net		1,862	89
Interest rate swaps \| Discontinued Operation, Gain (Loss) From Disposal Of Discontinued Operation [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	0	0
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net		0	0
Foreign Exchange Contract [Member] \| Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	0	0
Foreign Exchange Contract [Member] \| Cost of Goods and Service Benchmark [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ 1,638
Foreign Exchange Contract [Member] \| Discontinued Operation, Gain (Loss) From Disposal Of Discontinued Operation [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax		$ 1,746	$ 129

Information by Segment and Geographic Area (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 663,284	$ 656,875
Percent of Revenue , Unaffiliated Customer	10.00%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 303,839	283,864
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	69,691	96,095
All Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 289,754	$ 276,916

Debt and Credit Agreements

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Debt and Credit Agreements

The Company's long-term debt consists of the following:



(In thousands)	December 31 2023		December 31 2022
Senior Secured Credit Facilities (a):
New Term Loan with an interest rate of 7.72% and 6.69% at December 31, 2023 and 2022, respectively	$	487,500	$	492,500


Revolving Credit Facility with an average interest rate of 8.12% and 7.19% at December 31, 2023 and 2022, respectively	422,000		370,000
5.75% Senior Notes	475,000		475,000
Other financing payable (including finance leases) in varying amounts due principally through 2028 with a weighted-average interest rate of 6.11% and 5.00% at December 31, 2023 and 2022, respectively	44,469		26,661
Total debt obligations	1,428,969		1,364,161
Less: deferred financing costs	(11,974)		(15,172)
Total debt obligations, net of deferred financing costs	1,416,995		1,348,989
Less: current maturities of long-term debt	(15,558)		(11,994)
Long-term debt	$	1,401,437	$	1,336,995

(a) The current portion of long-term debt related to the Senior Secured Credit Facilities was $5.0 million with the remainder reflected as Long-term debt at December 31, 2023 and 2022.

The maturities of long-term debt for the four years following December 31, 2024 are as follows:


(In thousands)
2025	$	13,615
2026	434,768
2027	486,442
2028	472,443

Cash payments for interest on debt were $101.5 million, $73.4 million and $60.9 million in 2023, 2022 and 2021, respectively.

In February 2022, the Company amended its Credit Agreement to reset the levels of its Net Debt to Consolidated Adjusted EBITDA ratio covenant. As a result of this amendment, the total Net Debt to Consolidated Adjusted EBITDA ratio covenant was set at 5.50x for the quarter ending June 30, 2022, and decreases quarterly by 0.25x until reaching 4.00x for the quarter ending December 31, 2023 and thereafter. In addition, upon closing on the divestiture of Rail, the total Net Debt to Consolidated Adjusted EBITDA ratio covenant will decrease by an additional 0.25x, provided, however, it will not go below 4.00x and a minimum Consolidated Adjusted EBITDA to consolidated interest charges ratio covenant, which is not to be less than 3.0x will be maintained.

In June 2022, the Company repurchased $25.0 million of its 5.75% Senior Notes on the open market at a discount for $22.4 million. The Company recognized a gain on the extinguishment of debt of $2.3 million, net of the write-off of $0.3 million of previously recorded deferred financing costs, in the caption Facility fees and debt-related income (expense) on the Consolidated Statement of Operations.

In connection with entering into its AR Facility in June 2022, the Company amended its Senior Secured Credit Facilities to increase the permitted maximum outstanding amount of a securitization facility to $150.0 million. Certain other covenants and definitions were also modified to facilitate the AR Facility.

In August 2022, the Company amended its Revolving Credit Facility under its Credit Agreement to increase certain levels in the total net leverage covenant, temporarily reduce the ratio under the interest coverage covenant and add a new pricing level applicable to revolving credit loans. Revolving credit loans bear interest at a rate, depending on total net leverage, ranging from 50 to 175 basis points over base rate or 150 to 275 basis points over LIBOR, subject to a zero floor. The Company’s total net leverage is capped at 5.50x of Consolidated Adjusted EBITDA through the end of 2023; the maximum total net leverage ratio decreases quarterly thereafter, reaching 4.00x for the last quarter in 2024 and thereafter. The total net leverage ratio covenant applicable to the third quarter of 2024 and earlier is subject to a 0.50x decrease upon closing of the divestiture of Rail. The Company’s required coverage of consolidated interest charges is set at a minimum of 2.75x of Consolidated Adjusted EBITDA through the end of 2024 (subject to an increase to 3.00x upon closing of the divestiture of Rail), and leveling at 3.00x for the first quarter in 2025 and thereafter. Any principal amount outstanding under the Revolving Credit Facility remains due and payable on its maturity on March 10, 2026.

In December 2022, the Company amended its Senior Secured Credit Facilities to, among other things, change the base rate used in determining loan interest rates from LIBOR to SOFR. This change was in anticipation of the expected cessation of LIBOR in 2023 and in compliance with FASB guidance. In addition, a one-month benchmark adjustment of 11.4 basis points was added to the applicable margins for the Revolving Credit Facility and the New Term Loan, which modified them to 61.4 to 286.4 basis points over term SOFR for the Revolving Credit Facility and 236.4 basis points over term SOFR for the New Term Loan. The change did not have a material effect on the Company's consolidated financial statements.

At December 31, 2023, the Company was in compliance with all covenants for its Senior Secured Credit Facilities, as amended in August 2022, as the total Net Debt to Consolidated Adjusted EBITDA ratio was 4.14x and the total interest coverage ratio was 3.03x. Based on balances and covenants in effect at December 31, 2023, the Company could increase Net Debt by $439.8 million and still be in compliance with these debt covenants. Alternatively, Consolidated Adjusted EBITDA could decrease by $29.8 million or interest expense could increase by $10.8 million and the Company would remain in compliance with these covenants.

The Company believes it will continue to maintain compliance with all covenants over the next twelve months based on its current outlook. However, the Company’s estimates of compliance with these covenants could change in the future with a deterioration in economic conditions, higher than forecasted interest rate increases, or an inability to successfully execute its plans by quarter to sustain increased pricing and continue to execute cost reduction initiatives that substantially mitigate the impacts of inflation and other factors may adversely impact its realized operating margins.

The Company's Credit Agreement imposes certain restrictions including, but not limited to, restrictions as to types and amounts of debt of liens that may be incurred by the Company; limitations on increases in dividend payments; limitations on repurchases of the Company's stock and limitations on certain acquisitions by the Company.

With respect to the Senior Secured Credit Facilities, the obligations of the Company are guaranteed by substantially all of the Company’s current and future wholly-owned domestic subsidiaries (“Guarantors”). All obligations under the Senior Credit Facility, and the guarantees of those obligations, are secured, subject to certain exceptions, by substantially all of the Company’s assets and the assets of the Guarantors.

The Credit Agreement requires certain mandatory prepayments of the New Term Loan, subject to certain exceptions, based on net cash proceeds of certain sales or distributions of assets, as well as certain casualty and condemnation events, in some cases subject to reinvestment rights and certain other exceptions; net cash proceeds of any issuance of debt, excluding permitted debt issuances; and a percentage of excess cash flow, as defined by the Credit Agreement, during a fiscal year.

Facility Fees and Debt-Related Income (Expense)

The components of the Consolidated Statements of Operations caption Facility fees and debt-related income (expense) were as follows:


	Years Ended December 31
(In thousands)	2023		2022		2021
Gain (loss) on extinguishment of debt	$	—	$	2,254	$	(2,668)
Unused debt commitment and amendment fees	(12)		(1,696)		(2,838)
Securitization and factoring fees	(10,750)		(3,514)		—
Facility fees and debt-related income (expense)	$	(10,762)	$	(2,956)	$	(5,506)

Revolving Credit Facility

Borrowings under the U.S.-based Revolving Credit Facility bear interest at a rate per annum ranging from 50 to 175 basis points over base rate or 161.4 to 286.4 basis points over term SOFR, which includes a one-month SOFR adjustment of 11.4 basis points, subject to a 0% floor. Any principal amount outstanding under the Revolving Credit Facility is due and payable on its maturity on March 10, 2026.

The following table shows the amount outstanding under the Revolving Credit Facility and available credit at December 31, 2023.



	December 31, 2023
(In thousands)	Facility Limit		Outstanding Balance		Outstanding Letters of Credit		Available Credit
Revolving Credit Facility	$	700,000	$	422,000	$	30,817	$	247,183

Other

Short-term borrowings totaled $14.9 million and $7.8 million at December 31, 2023 and 2022, respectively. At December 31, 2023 and 2022, Short-term borrowings consisted primarily of bank overdrafts and other third-party debt. The weighted-average interest rate for short-term borrowings at December 31, 2023 and 2022 was 6.10% and 4.65%, respectively.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(c))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI https://asc.fasb.org//470/tableOfContent

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

+ Details

Revenue Recognition

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Revenue Recognition

Revenues

The Company recognizes revenues to depict the transfer of promised services and products to customers in an amount that reflects the consideration the Company expects to receive in exchange for those services or products. Revenues from continuing operations include service revenues from HE and CE and product revenues from HE. Revenue from Rail is included in Income (loss) from discontinued businesses. See Note 1, Summary of Significant Accounting Policies, Revenue Recognition, for additional information.

A summary of the Company's revenues by primary geographical markets as well as by key product and service groups for the years ended December 31, 2023, 2022 and 2021 is as follows:


	Year Ended December 31, 2023
(In thousands)	Harsco Environmental Segment		Clean Earth Segment		Consolidated Totals
Primary Geographical Markets (a):
North America	$	318,574	$	928,321	$	1,246,895
Western Europe	431,893		—		431,893
Latin America (b)	170,194		—		170,194
Asia-Pacific	113,800		—		113,800
Middle East and Africa	86,867		—		86,867
Eastern Europe	19,576		—		19,576
Total Revenues	$	1,140,904	$	928,321	$	2,069,225

Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing; and related logistical services	$	950,961	$	—	$	950,961
Ecoproducts	162,291		—		162,291
Environmental systems for aluminum dross and scrap processing	27,652		—		27,652
Hazardous waste processing solutions	—		767,338		767,338
Soil and dredged materials processing and reuse solutions	—		160,983		160,983

Total Revenues	$	1,140,904	$	928,321	$	2,069,225


	Year Ended December 31, 2022
(In thousands)	Harsco Environmental Segment		Clean Earth Segment		Consolidated Totals
Primary Geographical Markets (a):
North America	$	297,544	$	827,826	$	1,125,370
Western Europe	389,713		—		389,713
Latin America (b)	155,235		—		155,235
Asia-Pacific	119,433		—		119,433
Middle East and Africa	79,562		—		79,562
Eastern Europe	19,752		—		19,752
Total Revenues	$	1,061,239	$	827,826	$	1,889,065
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing; and related logistical services	$	900,426	$	—	$	900,426
Ecoproducts	145,911		—		145,911
Environmental systems for aluminum dross and scrap processing	14,902		—		14,902
Hazardous waste processing solutions	—		681,804		681,804
Soil and dredged materials processing and reuse solutions	—		146,022		146,022

Total Revenues	$	1,061,239	$	827,826	$	1,889,065


	Year Ended December 31, 2021
(In thousands)	Harsco Environmental Segment		Clean Earth Segment		Consolidated Totals
Primary Geographical Markets (a):
North America	$	281,125	$	780,316	$	1,061,441
Western Europe	442,286		—		442,286
Latin America (b)	132,349		—		132,349
Asia-Pacific	110,790		—		110,790
Middle East and Africa	81,337		—		81,337
Eastern Europe	20,196		—		20,196
Total Revenues	$	1,068,083	$	780,316	$	1,848,399
Key Product and Service Groups:
Environmental services related to resource recovery for metals manufacturing; and related logistical services	$	920,580	$	—	$	920,580
Ecoproducts	132,389		—		132,389
Environmental systems for aluminum dross and scrap processing	15,114		—		15,114
Hazardous waste processing solutions	—		639,233		639,233
Soil and dredged materials processing and reuse solutions	—		141,083		141,083

Total Revenues	$	1,068,083	$	780,316	$	1,848,399

(a) Revenues are attributed to individual countries based on the location of the facility generating the revenue.

(b) Includes Mexico.

The Company may receive payments in advance of earning revenue (advances on contracts), which are included in Other current liabilities and Other liabilities on the Consolidated Balance Sheets. The Company may recognize revenue in advance of being able to contractually invoice the customer (contract assets), which is included in Other current assets on the Consolidated Balance Sheets. Contract assets are transferred to Trade accounts receivable, net, when the right to payment becomes unconditional. Contract assets and advances on contracts are reported as a net position, on a contract-by-contract basis, at the end of each reporting period.

The Company had contract assets totaling $8.5 million and $5.3 million at December 31, 2023 and 2022, respectively. The increase is due principally to additional contract assets recognized in excess of the transfer of contract assets to accounts receivable. The Company had advances on contracts totaling $5.6 million and $6.8 million at December 31, 2023 and 2022, respectively. The decrease is due principally to recognition of revenue on previously received advances on contracts in excess of receipts of new advances on contracts during the period. During the year ended December 31, 2023, the Company recognized approximately $6.5 million of revenue related to amounts previously included in advances on contracts.

At December 31, 2023, HE had remaining, fixed, unsatisfied performance obligations, where the expected contract duration exceeds one year, totaling $60.6 million. Of this amount, $21.6 million is expected to be fulfilled by December 31, 2024, $19.3 million by December 31, 2025, $8.0 million by December 31, 2026, $5.2 million by December 31, 2027 and the remainder thereafter. These amounts exclude any variable fees, fixed fees subject to indexation and any performance obligations expected to be satisfied within one year.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-10

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-15

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-13

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org//606/tableOfContent

+ Details

Revenue Recognition - Summary of Revenues by Primary Geographical Markets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,069,225	$ 1,889,065	$ 1,848,399
Environmental services related to resource recovery for metals manufacturing; and related logistical services
Disaggregation of Revenue [Line Items]
Total revenues	950,961	900,426	920,580
Applied Products [Member]
Disaggregation of Revenue [Line Items]
Total revenues	162,291	145,911	132,389
Aluminum Dross and Scrap Processing Systems [Member]
Disaggregation of Revenue [Line Items]
Total revenues	27,652	14,902	15,114
Waste Processing and Reuse Solutions [Member]
Disaggregation of Revenue [Line Items]
Total revenues	767,338	681,804	639,233
Soil and dredged material
Disaggregation of Revenue [Line Items]
Total revenues	160,983	146,022	141,083
North America
Disaggregation of Revenue [Line Items]
Total revenues	1,246,895	1,125,370	1,061,441
Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	431,893	389,713	442,286
Latin America
Disaggregation of Revenue [Line Items]
Total revenues	170,194	155,235	132,349
Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	113,800	119,433	110,790
Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	86,867	79,562	81,337
Eastern Europe
Disaggregation of Revenue [Line Items]
Total revenues	19,576	19,752	20,196
Harsco Environmental \| Operating segments
Disaggregation of Revenue [Line Items]
Total revenues	1,140,904	1,061,239	1,068,083
Harsco Environmental \| Operating segments \| Environmental services related to resource recovery for metals manufacturing; and related logistical services
Disaggregation of Revenue [Line Items]
Total revenues	950,961	900,426	920,580
Harsco Environmental \| Operating segments \| Applied Products [Member]
Disaggregation of Revenue [Line Items]
Total revenues	162,291	145,911	132,389
Harsco Environmental \| Operating segments \| Aluminum Dross and Scrap Processing Systems [Member]
Disaggregation of Revenue [Line Items]
Total revenues	27,652	14,902	15,114
Harsco Environmental \| Operating segments \| Waste Processing and Reuse Solutions [Member]
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0
Harsco Environmental \| Operating segments \| Soil and dredged material
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0
Harsco Environmental \| Operating segments \| North America
Disaggregation of Revenue [Line Items]
Total revenues	318,574	297,544	281,125
Harsco Environmental \| Operating segments \| Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	431,893	389,713	442,286
Harsco Environmental \| Operating segments \| Latin America
Disaggregation of Revenue [Line Items]
Total revenues	170,194	155,235	132,349
Harsco Environmental \| Operating segments \| Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	113,800	119,433	110,790
Harsco Environmental \| Operating segments \| Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	86,867	79,562	81,337
Harsco Environmental \| Operating segments \| Eastern Europe
Disaggregation of Revenue [Line Items]
Total revenues	19,576	19,752	20,196
Clean Earth \| Operating segments
Disaggregation of Revenue [Line Items]
Total revenues	928,321	827,826	780,316
Clean Earth \| Operating segments \| Environmental services related to resource recovery for metals manufacturing; and related logistical services
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0
Clean Earth \| Operating segments \| Applied Products [Member]
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0
Clean Earth \| Operating segments \| Aluminum Dross and Scrap Processing Systems [Member]
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0
Clean Earth \| Operating segments \| Waste Processing and Reuse Solutions [Member]
Disaggregation of Revenue [Line Items]
Total revenues	767,338	681,804	639,233
Clean Earth \| Operating segments \| Soil and dredged material
Disaggregation of Revenue [Line Items]
Total revenues	160,983	146,022	141,083
Clean Earth \| Operating segments \| North America
Disaggregation of Revenue [Line Items]
Total revenues	928,321	827,826	780,316
Clean Earth \| Operating segments \| Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0
Clean Earth \| Operating segments \| Latin America
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0
Clean Earth \| Operating segments \| Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0
Clean Earth \| Operating segments \| Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	0	0	0
Clean Earth \| Operating segments \| Eastern Europe
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 0	$ 0

Employee Benefit Plans (Details 4) - USD ($) $ in Millions	12 Months Ended
Employee Benefit Plans (Details 4) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Retirement Benefits [Abstract]
Contributions By The Company	$ 1.9	$ 1.9	$ 1.7

Property, Plant and Equipment - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net		$ 663,284	$ 656,875
Property, plant and equipment impairment charge	$ 14,100	14,099	0	$ 0
China
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net		$ 69,691	$ 96,095

Capital Stock

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Capital Stock

The authorized capital stock of the Company consists of 150,000,000 shares of common stock and 4,000,000 shares of preferred stock, both having a par value of $1.25 per share. The preferred stock is issuable in series with terms as fixed by the Board. No preferred stock has been issued. The following table summarizes the Company's common stock activity during the period from January 1, 2021 to December 31, 2023:



	Shares Issued	Treasury Shares (a)	Outstanding Shares







Outstanding, January 1, 2021	115,430,042	36,505,672	78,924,370

Shares issued for vested restricted stock units	305,535	112,275	193,260
Shares issued for vested performance stock units	124,077	54,950	69,127
Stock appreciation rights exercised	46,739	17,950	28,789


Outstanding, December 31, 2021	115,906,393	36,690,847	79,215,546

Shares issued for vested restricted stock units	341,051	131,089	209,962

Shares issued for vested restricted stock awards	87,765	40,304	47,461
Stock appreciation rights exercised	23,311	6,640	16,671

Outstanding, December 31, 2022	116,358,520	36,868,880	79,489,640
Shares issued for vested restricted stock units	401,385	122,659	278,726


Shares issued for vested restricted stock awards	124,106	57,637	66,469
Outstanding, December 31, 2023	116,884,011	37,049,176	79,834,835

The following is a reconciliation of the average shares of common stock used to compute basic earnings per common share to the shares used to compute diluted earnings per common share as shown on the Consolidated Statements of Operations:


(In thousands, except per share data)	2023		2022		2021
Income (loss) from continuing operations attributable to Enviri Corporation common stockholders	$	(45,519)	$	(137,155)	$	22,137

Weighted-average shares outstanding—basic	79,796		79,493		79,234
Dilutive effect of stock-based compensation	—		—		1,055
Weighted-average shares outstanding—diluted	79,796		79,493		80,289
Income (loss) from continuing operations per common share, attributable to Enviri Corporation common stockholders:
Basic	$	(0.57)	$	(1.73)	$	0.28

Diluted	$	(0.57)	$	(1.73)	$	0.28

The following average outstanding stock-based compensation units were not included in the computation of diluted earnings per share because the effect was antidilutive or the market conditions for the performance share units were not met:


(In thousands)	2023	2022	2021
Restricted stock units	1,219	672	—

Stock appreciation rights	2,303	2,092	826
Performance share units	1,341	1,040	865

- Definition

The entire disclosure for equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-13

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-14

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481062/946-235-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481062/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481004/946-505-50-6

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-6

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(e)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-Name Accounting Standards Codification
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-URI https://asc.fasb.org//505/tableOfContent

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-13

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-13

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-13

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-14

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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-Section 50
-Paragraph 14
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-14

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-16

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-18

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
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-Name Accounting Standards Codification
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-Paragraph 18
-Subparagraph (b)
-Publisher FASB
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Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-18

+ Details

Debt and Credit Agreements - Schedule of Facility Fees and Debt-Related Income (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Facility Fees and Debt-Related Income [Line Items]
Loss on early extinguishment of debt	$ 0	$ 2,254	$ (2,668)
Facility fees and debt-related income (expense)	(10,762)	(2,956)	(5,506)
Facility Fees and Debt-Related Income (Expense)
Schedule of Facility Fees and Debt-Related Income [Line Items]
Loss on early extinguishment of debt	0	2,254	(2,668)
Unused Debt Commitment And Amendment Fees	(12)	(1,696)	(2,838)
Securitization And Factoring Fees	$ (10,750)	$ (3,514)	$ 0

Property, Plant and Equipment

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, Plant and Equipment, Net

PP&E consist of the following:


(In thousands)	Estimated Useful Lives	December 31 2023		December 31 2022
Land	—	$	72,099	$	72,020
Land improvements	5-20 years	17,149		16,750
Buildings and improvements (a)	10-30 years	218,877		217,926
Machinery and equipment (b)	3-20 years	1,652,562		1,513,238
Uncompleted construction	—	59,335		84,472
Gross property, plant and equipment		2,020,022		1,904,406
Less: Accumulated depreciation		(1,356,738)		(1,247,531)
Property, plant and equipment, net		$	663,284	$	656,875

(a) Buildings and improvements include leasehold improvements that are amortized over the shorter of their useful lives or the term of the lease.

(b) Includes information technology hardware and software.

In the third quarter of 2020, a customer of HE in China ceased steel making operations at its steel mill site in order to relocate the operations to a new site, as a result of a government mandate to improve environmental conditions of the area, which led to HE having idled equipment on-site. The Company continues to provide services to the same customer at the new site. The customer had entered into an agreement with the government where it will receive compensation for the losses the customer has incurred as a result of the forced shutdown, and the Company pursued similar compensation from the customer as well as seeking relief directly from the local government. During the quarter ended June 30, 2023, the Company determined that recovery was no longer probable and recorded an impairment charge of $14.1 million related to the now abandoned equipment at the previous site, which is included in the caption Property, plant and equipment impairment charge in the Condensed Consolidated Statements of Operations.

Income Taxes (Details 5) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details 5) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at the beginning of the period	$ 2,792	$ 3,127	$ 2,896
Additions for tax positions related to the current year (includes currency translation adjustment)	439	189	316
Additions for tax positions related to prior years (includes currency translation adjustment)			500
Statutes of limitations expirations	(1,106)	(524)	(585)
Balance at the end of the period	2,125	2,792	3,127
Reconciliation of Deferred Income Tax Benefits [Roll Forward]
Balance at beginning of period	(21)	(22)	(22)
Additions for tax positions related to the current year (includes currency translation adjustment)	(1)	(1)	(1)
Statutes of limitation expirations	5	2	1
Balance at the end of the period	(17)	(21)	(22)
Reconciliation of Net Unrecognized Tax Benefits [Roll Forward]
Balance at the beginning of the period	2,771	3,105	2,874
Additions for tax positions related to the current year (includes currency translation adjustment)	438	188	315
Additions for tax positions related to prior years (includes currency translation adjustment)			500
Statutes of limitation expirations	(1,101)	(522)	(584)
Balance at the end of the period	$ 2,108	$ 2,771	$ 3,105

Employee Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2023

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Net Benefit Costs

NPPC from continuing operations for U.S. and international plans for 2023, 2022 and 2021 is as follows:


	U.S. Plans						International Plans
(In thousands)	2023		2022		2021		2023		2022		2021
Net Periodic Pension Cost (Income):
Defined benefit pension plans:
Service cost	$	—	$	—	$	—	$	1,221	$	1,867	$	1,805
Interest cost	10,173		5,716		4,813		30,166		16,500		12,652
Expected return on plan assets	(7,000)		(10,795)		(12,199)		(31,198)		(38,891)		(45,018)
Recognized prior service costs	—		—		—		519		534		582
Recognized losses	4,601		4,732		5,538		14,316		13,060		18,119

Settlement/curtailment loss (gain)	—		—		—		(42)		(33)		(6)
Defined benefit pension plan cost (income)	7,774		(347)		(1,848)		14,982		(6,963)		(11,866)
Multiemployer pension plans	595		642		640		1,209		1,114		1,035
Defined contribution plans	6,656		5,401		5,660		4,123		4,122		4,196
Net periodic pension cost (income)	$	15,025	$	5,696	$	4,452	$	20,314	$	(1,727)	$	(6,635)

Schedule of Net Funded Status

The change in the financial status of the defined benefit pension plans and amounts recognized on the Consolidated Balance Sheets at December 31, 2023 and 2022 are as follows:


	U.S. Plans				International Plans
(In thousands)	2023		2022		2023		2022
Change in benefit obligation:
Benefit obligation at beginning of year	$	209,182	$	277,007	$	597,190	$	1,022,198
Service cost	—		—		1,221		1,867
Interest cost	10,173		5,716		30,166		16,500
Plan participants' contributions	—		—		13		14
Amendments	—		—		74		—
Actuarial (gain) loss	5,736		(57,841)		17,899		(299,841)
Settlements/curtailments	—		—		(203)		(132)
Benefits paid	(15,914)		(15,700)		(36,650)		(37,135)
Effect of foreign currency	—		—		31,785		(106,281)


Benefit obligation at end of year	$	209,177	$	209,182	$	641,495	$	597,190
Change in plan assets:
Fair value of plan assets at beginning of year	$	177,044	$	232,947	$	607,234	$	973,252
Actual return on plan assets	18,123		(41,909)		40,507		(250,002)
Employer contributions	1,674		1,706		24,715		22,614
Plan participants' contributions	—		—		13		14
Settlements/curtailments	—		—		(203)		(132)
Benefits paid	(15,914)		(15,700)		(36,650)		(37,135)
Effect of foreign currency	—		—		31,908		(101,377)


Fair value of plan assets at end of year	$	180,927	$	177,044	$	667,524	$	607,234

Funded status at end of year	$	(28,250)	$	(32,138)	$	26,029	$	10,044

Schedule of Amounts Recognized in Balance Sheet

Amounts recognized on the Consolidated Balance Sheets for defined benefit pension plans consist of the following at December 31, 2023 and 2022:


	U.S. Plans				International Plans
	December 31				December 31
(In thousands)	2023		2022		2023		2022
Noncurrent assets	$	—	$	—	$	44,241	$	26,033
Current liabilities	1,832		1,851		726		924
Noncurrent liabilities	26,418		30,287		17,486		15,065


AOCI	95,016		105,005		358,763		346,068

Schedule of Net Periodic Benefit Cost Not yet Recognized

Amounts recognized in AOCI for defined benefit pension plans consist of the following at December 31, 2023 and 2022:


	U.S. Plans				International Plans
(In thousands)	2023		2022		2023		2022
Net actuarial loss	$	95,016	$	105,005	$	350,601	$	337,849
Prior service cost	—		—		8,162		8,219

Total	$	95,016	$	105,005	$	358,763	$	346,068

Schedule of Expected Benefit Payments

Expected benefit payments for defined benefit pension plans over the next ten years are as follows:


(In millions)	2024		2025		2026		2027		2028		2029-2033
U.S. Plans	$	26.0	$	16.3	$	16.2	$	16.1	$	15.9	$	75.1
International Plans	37.2		37.8		38.8		39.8		41.3		221.3

Schedule of Assumptions Used

The weighted-average actuarial assumptions used to determine the defined benefit pension plan NPPC for 2023, 2022 and 2021 were as follows:


	U.S. Plans December 31						International Plans December 31						Global Weighted-Average December 31
	2023		2022		2021		2023		2022		2021		2023		2022		2021
Discount rates	5.3	%	2.7	%	2.4	%	5.1	%	1.9	%	1.4	%	5.1	%	2.1	%	1.6	%
Expected long-term rates of return on plan assets	7.0	%	6.3	%	6.8	%	5.1	%	4.4	%	4.7	%	5.5	%	4.7	%	5.1	%

The weighted-average actuarial assumptions used to determine the defined benefit pension plan obligations at December 31, 2023 and 2022 were as follows:


	U.S. Plans				International Plans				Global Weighted-Average
	December 31				December 31				December 31
	2023		2022		2023		2022		2023		2022
Discount rates	5.0	%	5.3	%	4.8	%	5.1	%	4.8	%	5.1	%

Schedule of Accumulated Benefit Obligations

The accumulated benefit obligation for all defined benefit pension plans at December 31, 2023 and 2022 was as follows:


	U.S. Plans				International Plans
	December 31				December 31
(In millions)	2023		2022		2023		2022
Accumulated benefit obligation	$	209.2	$	209.2	$	636.4	$	593.4

Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets

The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for defined benefit pension plans with accumulated benefit obligations in excess of plan assets at December 31, 2023 and 2022 were as follows:


	U.S. Plans				International Plans
	December 31				December 31
(In millions)	2023		2022		2023		2022
Projected benefit obligation	$	209.2	$	209.2	$	27.8	$	25.3
Accumulated benefit obligation	209.2		209.2		24.1		22.6
Fair value of plan assets	180.9		177.0		9.7		9.4

Schedule of Allocation of Plan Assets

The asset allocations attributable to the Company's international defined benefit pension plans at December 31, 2023 and 2022 and the long-term target allocation of plan assets, by asset category, are as follows:


International Plans Asset Category	Target Long-Term Allocation		Percentage of Plan Assets December 31
			2023		2022
Equity securities	16.0	%	10.8	%	24.8	%
Fixed income securities	78.0	%	83.3	%	65.5	%
Cash and cash equivalents	—		0.5	%	1.5	%
Other (b)	6.0	%	5.4	%	8.2	%

(b) Investments within this caption include diversified growth funds and real estate funds.

U.S. Plans | Pension Plan

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Allocation of Plan Assets

At December 31, 2023 and 2022, the asset allocations attributable to the Company's U.S. defined benefit pension plans and the long-term target allocation of plan assets, by asset category, are as follows:


	Target Long-Term Allocation	Percentage of Plan Assets December 31
U.S. Plans Asset Category		2023		2022
Domestic equity securities	6%-16%	10.7	%	21.0	%
International equity securities	22%-32%	24.3	%	22.2	%
Fixed income securities	51%-61%	52.8	%	44.6	%
Cash and cash equivalents	Less than 5%	0.9	%	1.0	%
Other (a)	1%-11%	11.3	%	11.2	%

(a) Investments within this caption include diversified global asset allocation funds and credit collection funds.

The fair values of the Company's U.S. defined benefit pension plans' assets at December 31, 2023 by asset class are as follows:


(In thousands)	Total		Level 1		Investments Valued at Net Asset Value (c)
Domestic equities:
Common stocks	$	2,791	$	2,791	$	—
Mutual funds—equities	16,583		16,583		—
International equities:

Mutual funds—equities	43,994		43,994		—
Fixed income investments:
U.S. Treasuries and collateralized securities	13,920		13,920		—

Mutual funds—bonds	81,634		81,634		—
Other—mutual funds	4,913		4,913		—
Cash and money market accounts	1,661		1,661		—
Other—partnerships/joint ventures	15,431		—		15,431
Total	$	180,927	$	165,496	$	15,431

The fair values of the Company's U.S. defined benefit pension plans' assets at December 31, 2022 by asset class are as follows:


(In thousands)	Total		Level 1		Investments Valued at Net Asset Value
Domestic equities:
Common stocks	$	1,951	$	1,951	$	—
Mutual funds—equities	35,177		35,177		—
International equities:

Mutual funds—equities	39,287		39,287		—
Fixed income investments:


Mutual funds—bonds	78,943		78,943		—
Other—mutual funds	6,699		6,699		—
Cash and money market accounts	1,780		1,780		—
Other - partnerships/joint ventures	13,207		—		13,207
Total	$	177,044	$	163,837	$	13,207

International Plans | Pension Plan

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Allocation of Plan Assets

The fair values of the Company's international defined benefit pension plans' assets at December 31, 2023 by asset class are as follows:


(In thousands)	Total		Level 1		Level 2
Equity securities:
Mutual funds—equities	$	71,755	$	—	$	71,755
Fixed income investments:
Mutual funds—bonds	551,701		—		551,701
Insurance contracts	4,631		—		4,631
Other:

Other mutual funds	36,188		—		36,188
Cash and money market accounts	3,249		3,249		—
Total	$	667,524	$	3,249	$	664,275

The fair values of the Company's international defined benefit pension plans' assets at December 31, 2022 by asset class are as follows:


(In thousands)	Total		Level 1		Level 2
Equity securities:
Mutual funds—equities	$	150,813	$	—	$	150,813
Fixed income investments:

Mutual funds—bonds	392,960		—		392,960
Insurance contracts	4,636		—		4,636
Other:

Other mutual funds	49,805		—		49,805
Cash and money market accounts	9,020		9,020		—
Total	$	607,234	$	9,020	$	598,214

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (88,098)	$ (176,431)	$ 2,729
Other comprehensive income (loss):
Foreign currency translation adjustments, net of deferred income taxes of $3,162, $(6,752) and $(23) in 2023, 2022 and 2021, respectively	28,988	(82,325)	(10,994)
Net gain (loss) on cash flow hedging instruments, net of deferred income taxes of $138, $(1,284) and $(797) in 2023, 2022 and 2021, respectively	(627)	3,181	2,816
Pension liability adjustments, net of deferred income taxes of $(2,693), $(2,590) and $(5,409) in 2023, 2022 and 2021, respectively	(1,041)	67,549	92,252
Unrealized gain (loss) on marketable securities, net of deferred income taxes of $(2), $4 and $(12) in 2023, 2022 and 2021, respectively	5	(12)	31
Other Comprehensive Income (Loss), Net of Tax, Total	27,325	(11,607)	84,105
Total comprehensive income (loss)	(60,773)	(188,038)	86,834
Less: Comprehensive (income) loss attributable to noncontrolling interests	2,594	472	(4,480)
Comprehensive income (loss) attributable to Enviri Corporation	$ (58,179)	$ (187,566)	$ 82,354

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Revenues from continuing operations:
Product revenues	$ 2,069,225	$ 1,889,065	$ 1,848,399
Costs and expenses from continuing operations:
Cost of sales	1,633,662	1,553,335	1,490,556
Selling, general and administrative costs	312,383	268,066	272,233
Research and development expenses	1,286	690	956
Goodwill and other intangible asset impairment charges	0	119,580	0
Property, plant and equipment impairment charge	14,099	0	0
Other expenses	(3,219)	4,737	(3,722)
Total costs and expenses	1,958,211	1,946,408	1,760,023
Operating income (loss) from continuing operations	111,014	(57,343)	88,376
Interest income	6,670	3,559	2,231
Interest expense	(103,872)	(75,156)	(63,235)
Facility fees and debt-related income (expense)	(10,762)	(2,956)	(5,506)
Defined benefit pension income (expense)	(21,600)	8,938	15,640
Income (loss) from continuing operations before income taxes and equity income	(18,550)	(122,958)	37,506
Income tax expense	(28,185)	(10,381)	(9,089)
Equity income (loss) of unconsolidated entities, net	(761)	(178)	(302)
Income (loss) from continuing operations	(47,496)	(133,517)	28,115
Discontinued operations:
Income (loss) from discontinued businesses	(39,252)	(50,301)	(25,863)
Income tax benefit (expense) from discontinued businesses	(1,350)	7,387	477
Income (loss) from discontinued operations, net of tax	(40,602)	(42,914)	(25,386)
Net income (loss)	(88,098)	(176,431)	2,729
Less: Net income attributable to noncontrolling interests	1,977	(3,638)	(5,978)
Net income (loss) attributable to Enviri Corporation	(86,121)	(180,069)	(3,249)
Amounts attributable to Harsco Corporation common stockholders:
Income (loss) from continuing operations, net of tax	(45,519)	(137,155)	22,137
Income (loss) from discontinued operations, net of tax	(40,602)	(42,914)	(25,386)
Net income (loss) attributable to Enviri Corporation common stockholders	$ (86,121)	$ (180,069)	$ (3,249)
Weighted average shares of common stock outstanding	79,796	79,493	79,234
Basic earnings (loss) per share attributable to Enviri Corporation common stockholders:
Continuing operations (in dollars per share)	$ (0.57)	$ (1.73)	$ 0.28
Discontinued operations (in dollars per share)	(0.51)	(0.54)	(0.32)
Basic earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ (1.08)	$ (2.27)	$ (0.04)
Diluted weighted average shares of stock outstanding	79,796	79,493	80,289
Diluted earnings (loss) per share attributable to Enviri Corporation common stockholders:
Continuing operations (in dollars per share)	$ (0.57)	$ (1.73)	$ 0.28
Discontinued operations (in dollars per share)	(0.51)	(0.54)	(0.32)
Diluted earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ (1.08)	$ (2.27)	$ (0.04)

Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative [Line Items]
Product revenues	$ 2,069,225	$ 1,889,065	$ 1,848,399
Foreign currency exchange forward contracts \| Maximum
Derivative [Line Items]
Maximum typical term of foreign currency forward exchange contracts (in days)	90 days

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147479806/606-10-50-4

+ Details

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Cash and cash equivalents	$ 121,239	$ 81,332
Restricted cash	3,375	3,762
Trade accounts receivable, net	280,772	264,428
Other receivables	33,857	25,379
Inventories	86,292	81,375
Prepaid Expense	29,926	30,583
Current portion of assets held-for-sale	255,428	266,335
Other current assets	16,467	14,541
Total current assets	827,356	767,735
Property, plant and equipment, net	663,284	656,875
Right-of-use assets, net	95,841	101,253
Goodwill	767,952	759,253
Intangible assets, net	324,861	352,160
Deferred income tax assets	15,322	17,489
Assets held-for-sale	90,930	70,105
Other assets	69,006	65,984
Total assets	2,854,552	2,790,854
Current liabilities:
Short-term borrowings	14,871	7,751
Current maturities of long-term debt	15,558	11,994
Accounts payable	198,576	205,577
Accrued compensation	73,553	43,595
Income taxes payable	6,133	3,640
Operating Lease, Liability, Current	25,119	25,521
Total Rail liabilities included in Liabilities of assets held-for-sale	172,036	159,004
Other current liabilities	149,387	140,199
Total current liabilities	655,233	597,281
Long-term debt	1,401,437	1,336,995
Retirement plan liabilities	45,087	46,601
Operating Lease, Liability, Noncurrent	72,145	75,246
Liabilities of assets held-for-sale	4,029	9,463
Accrued Environmental Loss Contingencies, Noncurrent	25,682	26,880
Deferred tax liabilities	28,810	30,069
Other liabilities	46,721	45,277
Total liabilities	2,279,144	2,167,812
COMMITMENTS AND CONTINGENCIES
HARSCO CORPORATION STOCKHOLDERS' EQUITY
Common stock, par value $1.25 (issued 116,884,011 and 116,358,520 shares at December 31, 2023 and 2022, respectively)	146,105	145,448
Additional paid-in capital	238,416	225,759
Accumulated other comprehensive loss	(539,694)	(567,636)
Retained earnings	1,528,320	1,614,441
Treasury stock, at cost (37,049,176 and 36,868,880 shares at December 31, 2023 and 2022, respectively)	(849,996)	(848,570)
Total Harsco Corporation stockholders' equity	523,151	569,442
Noncontrolling interests	52,257	53,600
Total equity	575,408	623,042
Total liabilities and equity	$ 2,854,552	$ 2,790,854

Discontinued Operations

12 Months Ended

Dec. 31, 2023

Business Combinations [Abstract]

Acquisitions and Dispositions

Discontinued Operations

Harsco Rail Segment

The Company is in the process of selling the Rail business. The intention to sell the business was first announced in the fourth quarter of 2021. The sale process was delayed due to certain macroeconomic conditions, including rising interest rates. Rail has historically been a separate reportable segment with primary operations in the United States, Europe and Asia Pacific.

Based on indicators of value obtained through the ongoing sale process as well as continuous evaluation of Rail’s business results, the Company performed a quantitative test to assess the recoverability of Rail’s asset group as of December 31, 2023. The Company used multiple methods to determine Rail’s fair value, including a discounted cash flow method, the guideline public company method and use of indicators of value obtained from the sale process. The performance of the recoverability test did not result in an impairment of the Rail asset group as of December 31, 2023. Changes to the stated assumptions, including the weighting between the methods applied and the assumptions within the various methods, could result in the recording of an impairment loss in future periods, which may be material.

Rail's balance sheet positions as of December 31, 2023 and 2022 are presented as Assets held-for-sale and Liabilities of assets held-for-sale in the Consolidated Balance Sheets and are summarized as follows:


(in thousands)	December 31 2023		December 31 2022
Trade accounts receivable, net	$	57,415	$	41,049
Other receivables	6,708		4,037
Inventories	103,077		105,256
Current portion of contract assets	56,341		84,848
Other current assets	31,692		30,950
Property, plant and equipment, net	44,749		41,004
Right-of-use assets, net	7,050		5,635
Goodwill	13,026		13,026
Intangible assets, net	2,486		2,746
Deferred income tax assets	827		6,887
Noncurrent portion of contract assets	22,048		—
Other assets	744		807
Total Rail assets included in Assets held-for-sale	$	346,163	$	336,245

Accounts payable	$	44,703	$	49,083
Accrued compensation	6,056		1,211
Current portion of operating lease liabilities	3,656		2,635
Current portion of advances on contracts	32,912		45,037
Reserve for contracts	52,725		32,246
Other current liabilities	31,984		28,793

Operating lease liabilities	3,331		3,121
Deferred tax liabilities	204		5,480
Other liabilities	494		861
Total Rail liabilities included in Liabilities of assets held-for-sale	$	176,065	$	168,467

The results of Rail are presented as discontinued operations and, as such, have been excluded from both continuing operations and segment results for the years ended December 31, 2023, 2022 and 2021. Certain key selected financial information included in Income (loss) from discontinued operations, net of tax, for Rail is as follows:


	Years Ended December 31
(In thousands)	2023		2022		2021
Amounts directly attributable to the former Harsco Rail Segment:
Service revenues	$	52,430	$	29,331	$	32,425
Product revenues (a)	244,365		215,585		266,221
Cost of services sold	34,552		19,550		17,272
Cost of products sold	247,917		223,034		251,897
Income (loss) from discontinued businesses	(30,546)		(40,898)		(19,967)
Additional amounts allocated to the former Harsco Rail Segment:
Selling, general and administrative expenses (b)	$	3,573	$	4,039	$	178

(a) The decrease in product revenues for 2022, as compared to 2021, is due in part to liquidated damages and penalties on certain long-term contracts, as discussed below.

(b) The Company includes costs to sell the Rail business in the caption Income (loss) from discontinued businesses in the Consolidated Statements of Operations.

The Company has retained corporate overhead expenses previously allocated to Rail of $4.2 million for each of the years ended December 31, 2023, 2022 and 2021 as part of Selling, general and administrative expenses on the Consolidated Statements of Operations.

Rail continues to manufacture highly-engineered equipment under large long-term fixed-price contracts with Network Rail, Deutsche Bahn, and two contracts with SBB. The Company has previously recognized estimated forward loss provisions related to these contracts of $44.5 million and $33.4 million for the years ended December 31, 2022 and 2021, respectively. These forward estimated loss provisions were due to several factors, such as material and labor cost inflation, supply chain delays including the bankruptcy of a key vendor and increased engineering efforts. These challenges continued into 2023 and the Company recorded an additional net forward loss provision of $32.8 million for these contracts for the year ended December 31, 2023, as discussed further below.

For Network Rail, in the second quarter of 2023, the Company reversed a portion of its estimated forward loss provision that was recorded in the previous years in the amount of $23.6 million. The favorable adjustment was the result of an amendment to the contract with Network Rail in 2023, which extended the delivery schedule for the machines and reduced the estimate of liquidated damages. Partially offsetting this were higher estimated material, engineering and labor costs. During the fourth quarter of 2023, a loss provision of $9.2 million was recorded due to increased estimated manufacturing costs including higher labor and decreased production efficiency. The increase in estimated costs is due principally to additional experience gained during the manufacturing process, including the restart of production at an idled manufacturing facility. The total net favorable forward loss provision adjustment recognized during 2023 was $14.4 million.

For the Deutsche Bahn contract, during 2023, additional estimated forward loss provisions of $39.9 million were recorded, with $8.3 million, $2.4 million and $29.2 million recorded in the second, third and fourth quarters, respectively. The main drivers of the additional forward loss provisions are increased estimated costs for components and engineering, as well as additional penalties recorded due to delivery delays. The increased costs include additional costs for new supply chain partners after a critical European-based supplier that filed for bankruptcy in 2022 had ceased operations during 2023.

For the second SBB contract, the Company recorded additional estimated forward loss provisions of $7.3 million for 2023, with $6.1 million and $1.2 million recorded in the second and fourth quarters, respectively. The additional loss provision was due to increased estimates for material, engineering and commissioning costs for the remaining vehicles.

The estimated forward loss provisions represent the Company's best estimate based on currently available information. It is possible that the Company's overall estimate of liquidated damages, penalties and costs to complete these contracts may change, which could result in an additional estimated forward loss provision at such time. The Company will continue to update its estimates to complete these contracts, which will include the effect of negotiations with the customers regarding price increases, change orders and extensions to delivery schedules.

The first contract with SBB is complete. As of December 31, 2023, based on costs incurred, the second contract with SBB is 85% complete and the contracts with Network Rail and Deutsche Bahn are 53% and 40% complete, respectively.

The following is selected financial information included on the Consolidated Statements of Cash Flows attributable to Rail:


	Years Ended December 31
(In thousands)	2023		2022		2021
Cash flows from operating activities (non-cash)
Depreciation and amortization	$	—	$	—	$	4,329
Cash flows from investing activities
Purchases of property, plant and equipment	2,453		1,618		1,406

Income Taxes

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Income Taxes

Current income tax expense or benefit represents the amounts expected to be reported on the Company's income tax returns, and deferred income tax expense or benefit represents the change in net deferred tax assets and liabilities. Deferred tax assets and liabilities are determined based on the difference between the financial statement and tax bases of assets and liabilities as measured by the enacted income tax rates that will be in effect when these differences reverse. Valuation allowances are recorded as appropriate to reduce deferred tax assets to the amount considered more likely than not to be realized.

Income (loss) from continuing operations before income taxes and equity income as reported on the Consolidated Statements of Operations consists of the following:


(In thousands)	2023		2022		2021
U.S.	$	(28,658)	$	(152,602)	$	(34,462)
International	10,108		29,644		71,968
Total income (loss) from continuing operations before income taxes and equity income	$	(18,550)	$	(122,958)	$	37,506

Income tax expense (benefit) as reported on the Consolidated Statements of Operations consists of the following:


(In thousands)	2023		2022		2021
Income tax expense (benefit):
Currently payable:

U.S. state	$	3,463	$	1,416	$	507
International	21,096		14,914		22,295
Total income taxes currently payable	24,559		16,330		22,802
Deferred U.S. federal	2,446		(6,219)		(4,594)
Deferred U.S. state	(1,163)		(2,274)		(18)
Deferred international	2,343		2,544		(9,101)
Total income tax expense (benefit) from continuing operations	$	28,185	$	10,381	$	9,089

Cash payments for income taxes were $20.1 million, $20.9 million and $21.7 million for 2023, 2022 and 2021, respectively. The cash payments for 2023 are relatively consistent with the payments for 2022 and for 2021.

A reconciliation of the normal expected statutory U.S. federal income tax expense (benefit) to the actual Income tax expense (benefit) from continuing operations as reported on the Consolidated Statements of Operations is as follows:


(In thousands)	2023		2022		2021
U.S. federal income tax expense (benefit), at statutory tax rate of 21%	$	(3,896)	$	(25,821)	$	7,877
U.S. state income taxes, net of federal income tax benefit	1,044		(929)		(310)
U.S. other domestic deductions and credits	(761)		(594)		(415)
Difference in effective tax rates on international earnings and remittances	13,311		5,779		4,488
Uncertain tax position contingencies and settlements	(768)		(290)		783
Changes in realization of deferred tax assets	14,498		8,263		(5,035)
U.S. non-deductible expenses	1,146		791		936
Nondeductible goodwill impairment	—		19,548		—
PP&E / Intangible asset impairment	2,961		3,150		—
State deferred tax rate changes	304		154		592
Foreign derived intangible income deduction	(785)		(938)		—
Share-based compensation	1,131		1,268		173

Total income tax expense (benefit) from continuing operations	$	28,185	$	10,381	$	9,089

At December 31, 2023, 2022 and 2021, the Company's annual effective income tax rate on income (loss) from continuing operations was (151.9)%, (8.4)% and 24.2%, respectively.

The Company’s international income from continuing operations before income taxes and equity income was $10.1 million and $29.6 million for 2023 and 2022, respectively. In 2022, the Company recorded a $15.0 million intangible assets impairment for the Altek business with no tax benefit. In 2023, the Company recorded a $14.1 million assets impairment for one of the HE sites in China with no tax benefit. At the same time that the write-off of PPE occurred, the forecast of future taxable income was revised, resulting in decision to record a $3.7 million income tax charge of prior year deferred tax assets in China. The Company's total international income tax expense increased from $17.5 million in 2022 to $23.4 million in 2023 primarily due to the China income tax charge and the change in mix of income.

The Company’s differences in income tax expense for 2023 and 2022 on international earnings and remittances were $13.3 million and $5.8 million, respectively, which included U.S income tax expense on international deemed remittances of $0.3 million and $0.1 million, respectively. The increase is primarily due to an increase in U.K. defined benefit pension expense related to the impact of higher discount rates applied to the Company's 2023 plan obligations and a lower return on plan assets in the current year with no tax benefit and the change in mix of income.

The Company's U.S. loss from continuing operations before income taxes and equity income was $28.7 million and $152.6 million for 2023 and 2022, respectively. The Company's total U.S. income tax increased from a $7.1 million benefit in 2022 to $4.7 million expense in 2023 primarily due to CE's business improvement, increased disallowed interest expense due to higher interest rates and a $3.0 million tax benefit recorded in 2022 on the deductible portion of the goodwill impairment for the Clean Earth business not recurring in 2023.

The income tax effects of the temporary differences giving rise to the Company's deferred tax assets and liabilities at December 31, 2023 and 2022 are as follows:


	2023 (a)				2022 (a)
(In thousands)	Asset		Liability		Asset		Liability
Depreciation and amortization	$	—	$	55,004	$	—	$	61,145
Right-of-use assets	—		23,887		—		24,826
Operating lease liabilities	24,222		—		25,024		—
Expense accruals	33,790		—		28,758		—
Inventories	3,704		—		4,011		—
Provision for receivables	3,801		—		2,781		—
Deferred revenue	6,377		—		4,484		—
Operating loss carryforwards	54,935		—		54,237		—
Tax credit carryforwards	15,298		—		21,443		—

Pensions	—		580		5,171		—
Currency adjustments	—		754		—		3,330

Section 163(j) disallowed interest expense	25,937		—		13,869		—
Research and development	6,014		—		2,795		—
Stock based compensation	7,387		—		6,580		—
Other	—		1,823		—		3,198
Subtotal	181,465		82,048		169,153		92,499
Valuation allowance	(112,905)		—		(89,234)		—
Total deferred income taxes	$	68,560	$	82,048	$	79,919	$	92,499

(a) Does not include approximately $1.1 billion of statutory loss carryforwards within Luxembourg for which the Company considers the utilization of these attributes remote and as such no deferred tax asset or corresponding valuation allowance has been recorded.

At December 31, 2023, the tax-effected amount of net operating losses ("NOLs") totaled $54.9 million. Tax-effected NOLs from international operations are $43.9 million. Of that amount, $39.6 million can be carried forward indefinitely and $4.3 million will expire at various times between 2024 and 2043. Tax-effected U.S. state NOLs are $11.0 million. Of that amount, $2.3 million expire at various times between 2024 and 2028, $1.7 million expire at various times between 2029 and 2033, $3.1 million expire at various times between 2034 and 2038 and $3.9 million expire at various times between 2039 and 2043.

Valuation allowances of $112.9 million and $89.2 million at December 31, 2023 and 2022, respectively, related principally to deferred tax assets for pension liabilities, NOLs, disallowed interest expense and foreign currency translation that are uncertain as to realizability. In 2023, the Company recorded a $12.7 million valuation allowance increase related to disallowed interest expense, a $9.3 million valuation allowance increase related to current year losses in certain foreign jurisdictions where the Company determined that it is more likely than not that these assets will not be realized, and a valuation allowance increase of $2.3 million from the effects of foreign currency translation adjustments.

The Tax Act introduced a transition tax and a territorial tax system, which was effective beginning in 2018. The territorial tax system impacts the Company's overall global capital and legal entity structure, working capital, and repatriation plan on a go-forward basis. The Company asserts that all foreign earnings will be indefinitely reinvested to meet local cash needs. The Company therefore intends to limit distributions to earnings previously taxed in the U.S., or earnings that would qualify for the 100 percent dividends received deduction provided for in the Tax Act, and earnings that would not result in any significant foreign taxes. Therefore, the Company has not recognized a deferred tax liability on its investment in foreign subsidiaries.

The Company recognizes accrued interest and penalty expense related to unrecognized income tax benefits in income tax expense or benefit. The Company recognized income tax benefit (expense) of $0.4 million and $(0.4) million during 2022 and 2021, respectively, for interest and penalties. There was no income tax benefit (expense) related to accrued interest and penalties during the year ended December 31, 2023. The Company has accrued $1.3 million, $1.3 million and $1.7 million for the payment of interest and penalties at December 31, 2023, 2022 and 2021, respectively.

A reconciliation of the change in the unrecognized income tax benefits balance from January 1, 2021 to December 31, 2023 is as follows:


(In thousands)	Unrecognized Income Tax Benefits		Deferred Income Tax Benefits		Unrecognized Income Tax Benefits, Net of Deferred Income Tax Benefits
Balances, January 1, 2021	$	2,896	$	(22)	$	2,874
Additions for tax positions related to the current year (includes currency translation adjustment)	316		(1)		315
Additions for tax positions related to prior years (includes currency translation adjustment)	500		—		500

Statutes of limitation expirations	(585)		1		(584)

Balance at December 31, 2021	3,127		(22)		3,105
Additions for tax positions related to the current year (includes currency translation adjustment)	189		(1)		188


Statutes of limitation expirations	(524)		2		(522)

Balance at December 31, 2022	2,792		(21)		2,771

Additions for tax positions related to the current year (includes currency translation adjustment)	439		(1)		438


Statutes of limitation expirations	(1,106)		5		(1,101)

Total unrecognized income tax benefits that, if recognized, would impact the effective income tax rate at December 31, 2023	$	2,125	$	(17)	$	2,108

Within the next twelve months, it is reasonably possible that up to $0.4 million of unrecognized income tax benefits will be recognized upon settlement of income tax examinations and the expiration of various statutes of limitations.

The Company files income tax returns as prescribed by the tax laws of the jurisdictions in which it operates. These tax returns are subject to examinations and possible challenges by the tax authorities. Positions challenged by the tax authorities may be settled or appealed to by the Company.

The tax years that remain subject to examination for the Company's major tax jurisdictions as of December 31, 2023 are shown below:


Jurisdiction						Earliest Open Year
Brazil						2019
China						2018
France						2021
United States:
Federal income tax						2020
State income tax						2017

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480990/946-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//740/tableOfContent

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-14

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-21

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482526/740-270-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-17

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I.5.Q1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
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-URI https://asc.fasb.org//1943274/2147479360/740-10-S99-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482603/740-30-50-2

+ Details

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 2,020,022	$ 1,904,406
Less: Accumulated depreciation	(1,356,738)	(1,247,531)
Property, plant and equipment, net	663,284	656,875
Land
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	72,099	72,020
Land improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 17,149	16,750
Land improvements \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	5 years
Land improvements \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	20 years
Buildings and improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 218,877	217,926
Buildings and improvements \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	10 years
Buildings and improvements \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	30 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 1,652,562	1,513,238
Machinery and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	3 years
Machinery and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Lives	20 years
Uncompleted construction
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 59,335	$ 84,472

Information by Segment and Geographic Area (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) segment Customer	Dec. 31, 2022 USD ($) Customer	Dec. 31, 2021 USD ($) Customer
Revenue, Major Customer [Line Items]
Revenues \| $	$ 2,069,225	$ 1,889,065	$ 1,848,399
Number of reportable segments \| segment	2
Number of major customers \| Customer	0	0	0
Harsco Environmental
Revenue, Major Customer [Line Items]
Number of major customers \| Customer	1	1	1
Clean Earth
Revenue, Major Customer [Line Items]
Number of major customers \| Customer	1
All Other
Revenue, Major Customer [Line Items]
Revenues \| $	$ 877,856	$ 813,710	$ 839,710
U.S. Plans
Revenue, Major Customer [Line Items]
Revenues \| $	$ 1,191,369	$ 1,075,355	$ 1,008,689

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

+ Details

Cover - USD ($)	12 Months Ended
Cover - USD ($)	Dec. 31, 2023	Feb. 16, 2024	Jun. 30, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Entity File Number	001-03970
Entity Registrant Name	ENVIRI CORPORATION
Entity Tax Identification Number	23-1483991
Entity Address, Address Line One	Two Logan Square100-120 North 18th Street, 17th Floor,
Entity Address, City or Town	Philadelphia,
Entity Address, State or Province	PA
Entity Address, Postal Zip Code	19103
City Area Code	267
Local Phone Number	857-8715
Title of 12(b) Security	Common stock, par value $1.25 per share
Trading Symbol	NVRI
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 763,077,089
Entity Common Stock, Shares Outstanding		79,834,835
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000045876
Document Period End Date	Dec. 31, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Amendment Flag	false
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Selected portions of the 2024 Proxy Statement are incorporated by reference into Part III of this Report.
Entity Incorporation, State or Country Code	DE

Stock-Based Compensation (Performance Stock Units) (Details) - Performance Stock Units - USD ($) $ / shares in Units, $ in Millions	1 Months Ended				12 Months Ended
	May 31, 2023	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period					3 years
Fair value assumptions
Risk-free interest rate (as a percent)	3.75%	4.67%	1.59%	0.25%
Dividend yield (as a percent)	0.00%	0.00%	0.00%	0.00%
Expected Life (Years)	2 years 7 months 24 days	2 years 9 months 25 days	2 years 9 months 29 days	2 years 9 months 29 days
Volatility	41.50%	43.90%	50.40%	50.70%
Fair value of award (in dollars per share)	$ 15.24	$ 10.91	$ 16.54	$ 25.38	$ 11.07
Recognized stock-based compensation expense					$ 5.8	$ 4.2	$ 5.1
Unrecognized stock-based compensation expense					$ 7.2
Unrecognized stock-based compensation expense, period of recognition					1 year 8 months 12 days
Unvested activity
Nonvested at the beginning of the period (in shares)					661,952
Granted (in shares)	29,337	758,965	500,624	316,959	788,302
Forfeited (in shares)					(116,331)
Vested (in shares)					(225,667)
Nonvested at the end of the period (in shares)					1,108,256	661,952
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)					$ 19.94
Granted (in dollars per share)	$ 15.24	$ 10.91	$ 16.54	$ 25.38	11.07
Forfeited (in dollars per share)					16.63
Vested (in dollars per share)					25.38
Nonvested at the end of the period (in dollars per share)					$ 12.87	$ 19.94
Shares expected to be issued (in shares)					0
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout of PSUs (percent of initial grant)					0.00%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout of PSUs (percent of initial grant)					200.00%

Accounts Receivable - Schedule of Fair Value of Notes Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Receivables [Abstract]
Receivable with Imputed Interest, Net Amount	$ 14,000	$ 23,900
Notes Receivable, Fair Value Disclosure	$ 15,400	$ 23,800

Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Balance at the beginning of the period		$ 759,253	$ 883,109
Goodwill, Impairment Loss			(104,580)
Foreign currency translation		8,699	(19,276)
Balance at the end of the period		767,952	759,253
Harsco Environmental
Goodwill [Roll Forward]
Balance at the beginning of the period		379,954	399,230
Goodwill, Impairment Loss			0
Foreign currency translation		8,699	(19,276)
Balance at the end of the period		388,653	379,954
Clean Earth
Goodwill [Roll Forward]
Balance at the beginning of the period		379,299	483,879
Goodwill, Impairment Loss	$ (104,600)		(104,580)
Foreign currency translation		0	0
Balance at the end of the period		$ 379,299	$ 379,299

- Definition

+ References + Details

Commitment and Contingencies (Tables)

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Schedule of Loss Contingencies by Contingency

The following table summarizes information related to the location and undiscounted amount of the Company's environmental liabilities:


(In thousands)	December 31 2023		December 31 2022
Current portion of environmental liabilities (a)	$	7,530	$	7,120
Long-term environmental liabilities	25,682		26,880
Total environmental liabilities	$	33,212	$	34,000

(a) The current portion of environmental liabilities is included in the caption Other current liabilities on the Consolidated Balance Sheets.

Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Right-of-use assets, net	$ 95,841	$ 101,253
Operating Lease, Liability, Current	25,119	25,521
Operating Lease, Liability, Noncurrent	$ 72,145	$ 75,246
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Property, Plant and Equipment, Net	Property, Plant and Equipment, Net
Finance Lease, Right-of-Use Asset	$ 43,151	$ 23,671
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current maturities of long-term debt	Current maturities of long-term debt
Finance Lease, Liability, Current	$ 9,723	$ 5,562
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt	Long-term debt
Finance Lease, Liability, Noncurrent	$ 33,911	$ 18,832

Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details 2) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Line Items]
Foreign earnings before tax	$ 10,108	$ 29,644	$ 71,968
Differences on international earnings and remittances	13,300	5,800
Income Tax Expense (Benefit)	28,185	10,381	9,089
Total international income tax expense	21,096	14,914	22,295
Operating loss carryforwards	54,935	54,237
Valuation Allowance	112,905	89,234
Interest and penalties recognized	0	400	(400)
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	1,300	1,300	1,700
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	400
Current Foreign Tax Expense (Benefit)	23,400	17,500
Impaired asset write-downs	88	641	1,005
Harsco Environmental
Income Tax Disclosure [Line Items]
Impaired asset write-downs	88	582	942
Clean Earth
Income Tax Disclosure [Line Items]
Income Tax Expense (Benefit)	3,000
Impaired asset write-downs	0	59	$ 63
Altek Group
Income Tax Disclosure [Line Items]
Income Tax Expense (Benefit)	0
Impaired asset write-downs	15,000
HE Sites
Income Tax Disclosure [Line Items]
Income Tax Expense (Benefit)	3,700
Impaired asset write-downs	14,100
International operations
Income Tax Disclosure [Line Items]
Operating loss carryforwards	43,900
Operating loss carryforwards not subject to expiration	39,600
Operating losses subject to expiration	4,300
U.S. state
Income Tax Disclosure [Line Items]
Operating loss carryforwards	11,000
United States
Income Tax Disclosure [Line Items]
Differences on international earnings and remittances	$ 300	$ 100

SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2023

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS

Continuing Operations

(In thousands)


			Additions (Deductions)
Description	Balance at Beginning of Period		Charged to Cost and Expenses		Foreign Currency Translation Adjustments		Other			Balance at End of Period
For the year ending December 31, 2023:
Allowance for Expected Credit Losses	$	8,347	$	7,039	$	(37)	$	170	(a)	$	15,519
Deferred Tax Assets—Valuation Allowance	89,234		26,031		2,268		(4,628)		(b)	112,905
For the year ending December 31, 2022:
Allowance for Expected Credit Losses	$	11,654	$	403	$	(110)	$	(3,600)	(a)	$	8,347
Deferred Tax Assets—Valuation Allowance	92,385		14,126		(6,448)		(10,829)		(b)	89,234
For the year ending December 31, 2021:
Allowance for Expected Credit Losses	$	7,488	$	589	$	(206)	$	3,783	(a)	$	11,654
Deferred Tax Assets—Valuation Allowance	108,563		(4,252)		(3,502)		(8,424)		(b)	92,385

(a)Includes the write-off of, net of collections, on previously reserved accounts receivable balances and changes in credit memo reserves reflected as adjustments to revenue.

(b)2023 includes decreases of $1.8 million related to pension adjustments recorded through AOCI and $1.8 million related to state tax rate reductions and state NOL expirations in the U.S. 2022 included decreases of $7.1 million related to pension adjustments recorded through AOCI and $4.3 million related to state tax rate reductions in the U.S. 2021 included a decrease of $19.3 million related to pension adjustments recorded through AOCI and an increase of $14.4 million related to a UK tax rate change.

Financial Instruments - Effect of Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	$ 173	$ 1,966
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax			$ 267
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	938	(2,499)	3,345
Foreign Exchange Forward Two [Member]
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	(1,696)	1,966
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax			309
Interest Rate Swap Two [Member]
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	1,869	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax			(42)
Discontinued Operation, Gain (Loss) From Disposal Of Discontinued Operation [Member] \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	0	0
Interest expense \| Interest rate swaps
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(2,576)	4,245	3,474
Discontinued Operations, Held-for-sale or Disposed of by Sale \| Foreign currency exchange forward contracts
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	$ (1,638)	$ 1,746	$ (129)

Debt and Credit Agreements (Tables)

12 Months Ended

Dec. 31, 2023

Debt Disclosure [Abstract]

Schedule of Line of Credit Facilities

The following table shows the amount outstanding under the Revolving Credit Facility and available credit at December 31, 2023.



	December 31, 2023
(In thousands)	Facility Limit		Outstanding Balance		Outstanding Letters of Credit		Available Credit
Revolving Credit Facility	$	700,000	$	422,000	$	30,817	$	247,183

Schedule of Long-term Debt Instruments

The Company's long-term debt consists of the following:



(In thousands)	December 31 2023		December 31 2022
Senior Secured Credit Facilities (a):
New Term Loan with an interest rate of 7.72% and 6.69% at December 31, 2023 and 2022, respectively	$	487,500	$	492,500


Revolving Credit Facility with an average interest rate of 8.12% and 7.19% at December 31, 2023 and 2022, respectively	422,000		370,000
5.75% Senior Notes	475,000		475,000
Other financing payable (including finance leases) in varying amounts due principally through 2028 with a weighted-average interest rate of 6.11% and 5.00% at December 31, 2023 and 2022, respectively	44,469		26,661
Total debt obligations	1,428,969		1,364,161
Less: deferred financing costs	(11,974)		(15,172)
Total debt obligations, net of deferred financing costs	1,416,995		1,348,989
Less: current maturities of long-term debt	(15,558)		(11,994)
Long-term debt	$	1,401,437	$	1,336,995

(a) The current portion of long-term debt related to the Senior Secured Credit Facilities was $5.0 million with the remainder reflected as Long-term debt at December 31, 2023 and 2022.

Schedule of Maturities of Long-term Debt

The maturities of long-term debt for the four years following December 31, 2024 are as follows:


(In thousands)
2025	$	13,615
2026	434,768
2027	486,442
2028	472,443

Schedule Of Facility Fees And Debt-Related Income (Expense)

The components of the Consolidated Statements of Operations caption Facility fees and debt-related income (expense) were as follows:


	Years Ended December 31
(In thousands)	2023		2022		2021
Gain (loss) on extinguishment of debt	$	—	$	2,254	$	(2,668)
Unused debt commitment and amendment fees	(12)		(1,696)		(2,838)
Securitization and factoring fees	(10,750)		(3,514)		—
Facility fees and debt-related income (expense)	$	(10,762)	$	(2,956)	$	(5,506)

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-Name Accounting Standards Codification
-Section 55
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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+ Details

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2023

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of restricted stock units issued and compensation expense

The following table summarizes RSUs issued and the compensation expense from continuing operations recorded for the years ended December 31, 2023, 2022, and 2021:


	RSUs (a)	Weighted Average Fair Value	Expense
(Dollars in thousands, except per unit)			2023		2022		2021
Directors:










2020	34,986	10.29	—		—		120
2021	23,224	21.53	—		167		333
2022	63,696	7.85	167		333		—
2023	80,705	9.03	516		—		—
Employees:










2018	242,791	19.93	—		—		142
2019	270,864	22.25	—		314		1,239
2020	522,087	8.22	91		741		1,093
2021	343,125	18.62	910		1,294		1,892
2022	450,915	12.36	1,040		1,486		—
2023	926,010	7.09	1,628		—		—
Total			$	4,352	$	4,335	$	4,819

(a) Represents number of awards originally issued.

Schedule of restricted stock unit activity

RSU activity for the year ended December 31, 2023 was as follows:



	Number of Shares	Weighted Average Grant-Date Fair Value












Non-vested at December 31, 2022	671,584	$	12.51
Granted	1,006,715	7.25
Vested	(364,241)	11.34
Forfeited	(94,737)	10.87
Non-vested at December 31, 2023	1,219,321	$	8.63

Schedule of Stock Appreciation Rights award activity

SARs activity for the year ended December 31, 2023 was as follows:



	Number of Shares	Weighted Average Exercise Price		Aggregate Intrinsic Value (in millions) (b)
















Outstanding, December 31, 2022	2,091,862	$	14.68	$	0.0
Granted	453,021	7.65

Forfeited/Expired	(241,865)	17.37
Outstanding, December 31, 2023	2,303,018	$	13.01	$	1.3

(b) Intrinsic value is defined as the difference between the current market value and the exercise price, for those SARs where the market price exceeds the exercise price.

Schedule of nonvested awards activity

The following table summarizes information related to outstanding and exercisable SARs at December 31, 2023:


	SARs Outstanding					SARs Exercisable
Range of Exercisable Prices	Vested	Non-vested	Weighted-Average Exercise Price per Share		Weighted-Average Remaining Contractual Life in Years	Number Exercisable	Weighted-Average Exercise Price per Share
$5.02 - $13.70	961,955	559,029	$	9.42	6.23	961,955	$	9.85
$16.53 - $22.70	569,276	39,275	18.65		3.72	569,276	18.65
$23.25 - $26.92	173,483	—	24.69		0.46	173,483	24.69
	1,704,714	598,304	$	13.01	5.13	1,704,714	$	14.30

Stock Appreciation Rights (SARs)

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of stock appreciation rights valuation assumptions

The table below summarizes the total SARs granted and the fair value of each grant estimated on the grant date using a Black-Scholes pricing model with the following assumptions:



	Number of Shares Granted	Risk-free Interest Rate		Dividend Yield		Expected Life (Years)	Volatility		SAR Grant Price	Fair Value of SAR
March 2021 Grant	184,641	0.91	%	—	%	6.0	61.9	%	18.58	10.48
March 2022 Grant	312,987	1.67	%	—	%	6.0	60.3	%	12.65	7.20
September 2022 Grant	10,000	3.56	%	—	%	6.0	60.6	%	5.02	2.97
October 2022 Grant	10,000	4.10	%	—	%	6.0	61.3	%	5.26	3.17
December 2022 Grant	10,000	3.75	%	—	%	6.0	62.4	%	6.15	3.72
March 2023 Grant	404,594	4.20	%	—	%	6.0	62.6	%	7.45	4.56
May 2023 Grant	48,427	3.48	%	—	%	6.0	63.0	%	9.31	5.64

Schedule of weighted-average grant-date fair value of unvested options

Weighted-average grant date fair value of non-vested SARs for the year ended December 31, 2023 was as follows:


	Number of Shares	Weighted-Average Grant Date Fair Value


















Non-vested shares, December 31, 2022	470,471	$	6.16
Granted	453,021	4.68
Vested	(276,566)	5.19
Forfeited	(48,622)	5.76
Non-vested shares, December 31, 2023	598,304	$	5.51

Performance Stock Units

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of stock appreciation rights valuation assumptions


	PSUs Issued
	Number of Shares Granted	Risk-free Interest rate		Dividend Yield		Expected Life (Years)	Volatility		Fair Value per PSU
March 2021 Grant	316,959	0.25	%	—	%	2.83	50.7	%	$	25.38
March 2022 Grant	500,624	1.59	%	—	%	2.83	50.4	%	$	16.54
March 2023 Grant	758,965	4.67	%	—	%	2.82	43.9	%	$	10.91
May 2023 Grant	29,337	3.75	%	—	%	2.65	41.5	%	$	15.24

Schedule of weighted-average grant-date fair value of unvested options

A summary of the Company's non-vested PSU activity during the year ending December 31, 2023 was as follows:



	Number of Shares	Weighted-Average Grant Date Fair Value




























Non-vested shares, December 31, 2022	661,952	$	19.94
Granted	788,302	11.07
Vested, not issued (a)	(225,667)	25.38


Forfeited	(116,331)	16.63
Non-vested shares, December 31, 2023	1,108,256	$	12.87

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
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-Section 35
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+ Details

Financial Instruments - Narrative (Details)	12 Months Ended
Financial Instruments - Narrative (Details)	Dec. 31, 2023 USD ($) country	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Jan. 31, 2023 USD ($)
Guarantor Obligations [Line Items]
Derivatives liability resulted from netting arrangement	$ 500,000	$ (100,000)
Pre-tax gains (losses)	1,100,000	(2,600,000)	$ 2,700,000
Fair value of long-term debt	1,394,500,000	1,227,600,000
Long-term Debt, Gross	1,428,969,000	$ 1,364,161,000
Term Loan
Guarantor Obligations [Line Items]
Principle amount	200,000,000			$ 300,000,000
London Interbank Offered Rate \| Fixed-Rate Term Loan \| Term Loan
Guarantor Obligations [Line Items]
Basis spread on variable rate		3.12%
Foreign currency exchange forward contracts
Guarantor Obligations [Line Items]
Notional amounts	$ 633,300,000	$ 573,800,000
Minimum
Guarantor Obligations [Line Items]
Number of countries in which entity has currency exposures \| country	30
Minimum \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Fixed-Rate Term Loan \| Term Loan
Guarantor Obligations [Line Items]
Basis spread on variable rate	4.16%
Maximum \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate \| Fixed-Rate Term Loan \| Term Loan
Guarantor Obligations [Line Items]
Basis spread on variable rate	4.21%
Stand by letters of credit, bonds and bank guarantees
Guarantor Obligations [Line Items]
Contingent liability outstanding	$ 489,600,000	500,400,000	519,400,000
Guarantee term	2 years
Stand by letters of credit, bonds and bank guarantees \| Minimum
Guarantor Obligations [Line Items]
Guarantee term	1 year
Fees paid to various banks and insurance companies on face amount of instruments (as a percent)	0.20%
Stand by letters of credit, bonds and bank guarantees \| Maximum
Guarantor Obligations [Line Items]
Guarantee term	5 years
Fees paid to various banks and insurance companies on face amount of instruments (as a percent)	3.00%
Indemnification Agreement
Guarantor Obligations [Line Items]
Recognition of potential future payment in the consolidated financial statements	$ 0
Discontinued Operation, Gain (Loss) From Disposal Of Discontinued Operation [Member] \| Interest rate swaps
Guarantor Obligations [Line Items]
Gain (Loss) on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring, Net		$ 0	$ 0

Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2023

Business Combinations [Abstract]

Disposal Groups, Including Discontinued Operations


(in thousands)	December 31 2023		December 31 2022
Trade accounts receivable, net	$	57,415	$	41,049
Other receivables	6,708		4,037
Inventories	103,077		105,256
Current portion of contract assets	56,341		84,848
Other current assets	31,692		30,950
Property, plant and equipment, net	44,749		41,004
Right-of-use assets, net	7,050		5,635
Goodwill	13,026		13,026
Intangible assets, net	2,486		2,746
Deferred income tax assets	827		6,887
Noncurrent portion of contract assets	22,048		—
Other assets	744		807
Total Rail assets included in Assets held-for-sale	$	346,163	$	336,245

Accounts payable	$	44,703	$	49,083
Accrued compensation	6,056		1,211
Current portion of operating lease liabilities	3,656		2,635
Current portion of advances on contracts	32,912		45,037
Reserve for contracts	52,725		32,246
Other current liabilities	31,984		28,793

Operating lease liabilities	3,331		3,121
Deferred tax liabilities	204		5,480
Other liabilities	494		861
Total Rail liabilities included in Liabilities of assets held-for-sale	$	176,065	$	168,467

Certain key selected financial information included in Income (loss) from discontinued operations, net of tax, for Rail is as follows:


	Years Ended December 31
(In thousands)	2023		2022		2021
Amounts directly attributable to the former Harsco Rail Segment:
Service revenues	$	52,430	$	29,331	$	32,425
Product revenues (a)	244,365		215,585		266,221
Cost of services sold	34,552		19,550		17,272
Cost of products sold	247,917		223,034		251,897
Income (loss) from discontinued businesses	(30,546)		(40,898)		(19,967)
Additional amounts allocated to the former Harsco Rail Segment:
Selling, general and administrative expenses (b)	$	3,573	$	4,039	$	178

(a) The decrease in product revenues for 2022, as compared to 2021, is due in part to liquidated damages and penalties on certain long-term contracts, as discussed below.

(b) The Company includes costs to sell the Rail business in the caption Income (loss) from discontinued businesses in the Consolidated Statements of Operations.

The following is selected financial information included on the Consolidated Statements of Cash Flows attributable to Rail:


	Years Ended December 31
(In thousands)	2023		2022		2021
Cash flows from operating activities (non-cash)
Depreciation and amortization	$	—	$	—	$	4,329
Cash flows from investing activities
Purchases of property, plant and equipment	2,453		1,618		1,406

- Definition

Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component.

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+ Details

Information by Segment and Geographic Area (Tables)

12 Months Ended

Dec. 31, 2023

Segment Reporting [Abstract]

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

Countries with revenues from unaffiliated customers or net PP&E of ten percent or more of the consolidated totals (in at least one period presented) are as follows:

Information by Geographic Area (a)


	Revenues from Unaffiliated Customers
	Years ended December 31
(In thousands)	2023		2022		2021
U.S.	$	1,191,369	$	1,075,355	$	1,008,689


All Other	877,856		813,710		839,710
Totals including Corporate	$	2,069,225	$	1,889,065	$	1,848,399

(a) Revenues are attributed to individual countries based on the location of the facility generating the revenue.

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]


	Property, Plant and Equipment, Net
	December 31
(In thousands)	2023		2022
U.S.	$	303,839	$	283,864
China	69,691		96,095


All Other	289,754		276,916
Totals including Corporate	$	663,284	$	656,875

Schedule of Segment Operating Information by Segment

Operating Information by Segment:



	Years ended December 31
(In thousands)	2023		2022		2021
Revenues
Harsco Environmental	$	1,140,904	$	1,061,239	$	1,068,083
Clean Earth	928,321		827,826		780,316

Total Revenues	$	2,069,225	$	1,889,065	$	1,848,399
Operating Income (Loss)
Harsco Environmental	$	77,635	$	59,559	$	103,402
Clean Earth	76,974		(81,785)		25,639
Corporate	(43,595)		(35,117)		(40,665)
Total Operating Income (Loss)	$	111,014	$	(57,343)	$	88,376
Total Assets
Harsco Environmental	$	1,417,278	$	1,416,717	$	1,386,087
Clean Earth	981,723		980,774		1,278,472
Corporate	109,388		57,118		56,086
Discontinued Operations	346,163		336,245		333,263
Total Assets	$	2,854,552	$	2,790,854	$	3,053,908
Depreciation
Harsco Environmental	$	113,571	$	108,880	$	105,830
Clean Earth	23,252		18,836		19,672
Corporate	2,133		1,996		1,900
Total Depreciation	$	138,956	$	129,712	$	127,402
Amortization
Harsco Environmental	$	4,030	$	6,809	$	8,052
Clean Earth	24,583		24,299		24,180
Corporate (b)	3,795		3,029		2,710
Total Amortization	$	32,408	$	34,137	$	34,942
Capital Expenditures
Harsco Environmental	$	104,045	$	109,508	$	137,228
Clean Earth	32,100		21,996		18,403
Corporate	427		4,038		1,289
Total Capital Expenditures	$	136,572	$	135,542	$	156,920

(b) Amortization expense on Corporate relates to the amortization of deferred financing costs.

Reconciliation of Operating Profit (Loss) from Segments to Consolidated

Reconciliation of Segment Operating Income to Consolidated Income (Loss) From Continuing Operations Before Income Taxes and Equity Income:



	Years ended December 31
(In thousands)	2023		2022		2021
Segment operating income (loss)	$	154,609	$	(22,226)	$	129,041
General Corporate expense	(43,595)		(35,117)		(40,665)
Operating income (loss) from continuing operations	111,014		(57,343)		88,376
Interest income	6,670		3,559		2,231
Interest expense	(103,872)		(75,156)		(63,235)
Defined benefit pension income (expense)	(21,600)		8,938		15,640
Facility fees and debt-related income (expense)	(10,762)		(2,956)		(5,506)
Income (loss) from continuing operations before income taxes and equity income	$	(18,550)	$	(122,958)	$	37,506

Accounts Receivable and Note Receivable - Schedule of Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Receivables [Abstract]
Trade accounts receivable	$ 296,291	$ 272,775
Less: Allowance for doubtful accounts	(15,519)	(8,347)
Trade accounts receivable, net	280,772	264,428
Other receivables	$ 33,857	$ 25,379

Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Other Intangible Assets

Goodwill by Segment

The following table reflects the changes in carrying amounts of goodwill by each reporting unit for the years ended December 31, 2023 and 2022:


(In thousands)	Harsco Environmental		Clean Earth		Consolidated Totals
Balance at December 31, 2021	$	399,230	$	483,879	$	883,109

Goodwill impairment	—		(104,580)		(104,580)
Foreign currency translation	(19,276)		—		(19,276)
Balance at December 31, 2022	379,954		379,299		759,253


Foreign currency translation	8,699		—		8,699
Balance at December 31, 2023	$	388,653	$	379,299	$	767,952

The Company's methodology for determining the fair value for its reporting units is described in Note 1, Summary of Significant Accounting Policies. The Company tests for goodwill impairment annually as of October 1, or more frequently if indicators of impairment exist or a decision is made to dispose of a business.

The performance of the Company's 2023 annual quantitative impairment tests did not result in any impairment of the Company's goodwill. In the second quarter of 2022, the Company determined that an interim test of goodwill was required for the Clean Earth reporting unit. The triggering event was principally due to lower earnings expectations due to the impacts of inflation. The Company used a DCF model to estimate the current fair value of the Clean Earth reporting unit (Level 3), which is defined as the Clean Earth segment. A number of significant assumptions and estimates are involved in the preparation of DCF models including future revenues, operating margin growth, the WACC, tax rates, capital spending, pension funding, the impact of business initiatives and working capital projections. The DCF model is based on approved forecasts for the early years and historical relationships and projections for later years. The WACC rate is derived from internal and external factors including, but not limited to, the average market price of the Company's stock, shares outstanding, book value of the Company's debt, the long-term risk-free interest rate, and both market and size-specific risk premiums. As a result of this testing, the Company recorded a goodwill impairment charge of $104.6 million for the Clean Earth reporting unit in the second quarter of 2022, which is included in Goodwill and other intangible asset impairment charges on the Consolidated Statement of Operations for the year-ended December 31, 2022. This charge had no impact on the Company's cash flows or compliance with debt covenants.

Intangible Assets

Net intangible assets totaled $324.9 million and $352.2 million at December 31, 2023 and 2022, respectively. The following table reflects these intangible assets by major category:


	December 31, 2023				December 31, 2022
(In thousands)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Customer related	$	97,963	$	64,040	$	95,573	$	54,482
Permits	309,679		66,733		309,177		50,703
Technology related	21,803		17,001		20,800		15,491
Trade names	30,409		11,816		30,212		9,198
Air rights	26,139		3,281		26,139		2,411
Patents	206		178		189		155
Non-compete agreement	2,500		2,344		2,500		1,718
Other	3,063		1,508		3,147		1,419
Total	$	491,762	$	166,901	$	487,737	$	135,577

Based on the current economic conditions, to include inflation and higher energy prices, the Company lowered its long-range projections for the Altek Group of the Harsco Environmental Segment. Due to the lower revenue projections, the Company tested the recoverability of Altek's asset group in the fourth quarter of 2022. The asset group primarily consists of technology and customer-related intangible assets. Undiscounted estimated cash flows of the Altek asset group were lower than the carrying value, therefore, the Company used a DCF model to estimate the current fair value of the Altek asset group (Level 3). A number of significant assumptions and estimates are involved in the preparation of DCF models including future revenues and operating margin growth, the WACC, capital spending, and the impact of business initiatives and working capital projections. The DCF model is based on approved forecasts for the early years and historical relationships and projections for later years. The WACC rate is based on the Company's WACC, adjusted for market participant assumptions. As a result of this testing, an impairment charge of $15.0 million was recorded, which is included in Goodwill and other intangible asset impairment charges on the Consolidated Statements of Operations for the year-ended December 31, 2022. The carrying value of Altek's intangible assets after the impairment charge was $14.2 million at December 31, 2023 and $15.3 million at December 31, 2022.

Amortization expense for intangible assets was $28.6 million, $31.1 million and $32.2 million for 2023, 2022 and 2021, respectively. Intangible assets are principally amortized using the straight-line method over the estimated useful life, except for the air rights, which are amortized based on usage. The following table shows the estimated amortization expense for the next five fiscal years based on current intangible assets.


(In thousands)	2024		2025		2026		2027		2028
Estimated amortization expense (a)	$	28,000	$	27,800	$	25,900	$	24,600	$	23,000

(a) These estimated amortization expense amounts do not reflect the potential effect of future foreign currency exchange rate fluctuations.

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pay vs Performance Disclosure
Net income (loss) attributable to Enviri Corporation common stockholders	$ (86,121)	$ (180,069)	$ (3,249)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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Reference 13: http://www.xbrl.org/2003/role/exampleRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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Reference 20: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 28: http://www.xbrl.org/2003/role/disclosureRef
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Reference 29: http://www.xbrl.org/2003/role/disclosureRef
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Reference 36: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Acquisitions and Dispositions - Schedule of Income (Loss) from Discontinued Operations Harsco Rail (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued businesses	$ 5,100
Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]		Income (loss) from discontinued businesses
Discontinued Operations, Held-for-sale \| Harsco Rail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (loss) from discontinued businesses		$ (30,546)	$ (40,898)	$ (19,967)
Selling, general and administrative expenses		3,573	4,039	178
Services \| Discontinued Operations, Held-for-sale \| Harsco Rail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue		52,430	29,331	32,425
Disposal Group, Including Discontinued Operation, Costs of Goods Sold		34,552	19,550	17,272
Product \| Discontinued Operations, Held-for-sale \| Harsco Rail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Revenue		244,365	215,585	266,221
Disposal Group, Including Discontinued Operation, Costs of Goods Sold		$ 247,917	$ 223,034	$ 251,897

Leases - Schedule of Future Lease Maturities (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 30,134
Finance Lease, Liability, Payments, Due Next Twelve Months	12,154
Lessee, Operating Lease, Liability, Payments, Due Year Two	23,486
Finance Lease, Liability, Payments, Due Year Two	10,531
Lessee, Operating Lease, Liability, Payments, Due Year Three	17,774
Finance Lease, Liability, Payments, Due Year Three	9,197
Lessee, Operating Lease, Liability, Payments, Due Year Four	11,740
Finance Lease, Liability, Payments, Due Year Four	7,426
Lessee, Operating Lease, Liability, Payments, Due Year Five	7,209
Finance Lease, Liability, Payments, Due Year Five	5,542
Lessee, Operating Lease, Liability, Payments, Due after Year Five	34,524
Finance Lease, Liability, Payments, Due after Year Five	6,869
Lessee, Operating Lease, Liability, Payments, Due	124,867
Finance Lease, Liability, Payment, Due	51,719
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(27,603)
Finance Lease, Liability, Undiscounted Excess Amount	(8,085)
Operating Lease, Liability	97,264
Finance Lease, Liability	$ 43,634

Accounts Receivable and Note Receivable (Notes)

12 Months Ended

Dec. 31, 2023

Receivables [Abstract]

Accounts Receivable and Note Receivable

Accounts receivable consist of the following:



(In thousands)	December 31 2023		December 31 2022
Trade accounts receivable	$	296,291	$	272,775
Less: Allowance for expected credit losses	(15,519)		(8,347)
Trade accounts receivable, net	$	280,772	$	264,428
Other receivables (a)	$	33,857	$	25,379

(a)Other receivables include employee receivables, insurance receivable, tax claims and refunds and other miscellaneous receivables not included in Trade accounts receivable, net.

The provision for expected credit losses related to trade accounts receivable was as follows:


	Years Ended December 31
(In thousands)	2023		2022		2021
Provision for expected credit losses related to trade accounts receivable	$	7,039	$	403	$	589

At December 31, 2023, $18.0 million of the Company's trade accounts receivable were past due by twelve months or more, with $11.3 million of this amount reserved. Included in these balances are amounts due from one of HE's steel mill customers located in the Middle East which has idled operations and missed contractual progress payments. Due to the Company's assessment of collectability, although the customer had indicated plans to either restart operations or sell to a third party, the Company recorded a reserve against their net remaining receivable balance of $5.3 million during the third quarter of 2023.

Accounts Receivable Securitization Facility

In June 2022, the Company and its SPE entered into an AR Facility with PNC Bank, National Association ("PNC") to accelerate cash flows from trade accounts receivable. The AR Facility has a three-year term. The maximum purchase commitment by PNC is $150.0 million.

The total outstanding balance of trade receivables that have been sold and derecognized by the SPE is $150.0 million as of December 31, 2023. The SPE owned $82.2 million and $69.7 million of the Company's trade receivables as of December 31, 2023 and 2022, respectively, which are included in the caption Trade accounts receivable, net, on the Consolidated Balance Sheets.

In 2022, the Company capitalized fees of $1.8 million related to the AR Facility, which are amortized into Facility fees and debt-related income (expense) on a straight-line basis over the AR Facility term on the Consolidated Statements of Operations. See Note 8, Debt and Credit Agreements, for facility expenses incurred.

The following table reflects proceeds the Company received from the AR Facility, which are included in cash flows from operating activities in the Consolidated Statements of Cash Flows:


	Year Ended December 31
(In millions)	2023		2022
Upon execution in June 2022	$	—	$	120.0
Additional proceeds	5.0		25.0
Total received	$	5.0	$	145.0

Factoring Arrangements

The Company maintains factoring arrangements with a financial institution to sell certain accounts receivable that are also accounted for as a sale of financial assets. The following table reflects balances for net amounts sold and program capacities for the arrangements:


(In millions)	December 31 2023		December 31 2022
Net amounts sold under factoring arrangements	$	16.1	$	17.3
Program capacities	32.6		31.4

Note Receivable

In January 2020, the Company sold IKG for $85.0 million including cash and a note receivable, subject to post-closing adjustments. The note receivable from the buyer has a face value of $40.0 million, bearing interest at 2.50%, that is paid in kind and matures on January 31, 2027. Any unpaid principal, along with any accrued but unpaid interest, is payable at maturity. Prepayment is required in case of a change in control or as a percentage of excess cash flow, as defined in the note receivable agreement. Because there are no scheduled payments under the terms of the note receivable, the balance is not classified as current and is included in the caption Other assets on the Consolidated Balance Sheets. The initial fair value of the note receivable was $34.3 million which was calculated using an average of various discounted cash flow scenarios based on anticipated timing of repayments (Fair Value Level 3 asset) and was a non-cash transaction. The note receivable is subsequently measured at amortized cost. Key inputs into the valuation model include: projected timing and amount of cash flows, pro forma debt rating, option-adjusted spread and the U.S. Treasury spot rate. The Company received payments of $11.2 million and $8.6 million during 2023 and 2022, respectively, related to excess cash flow.

The following table reflects the note receivable at amortized cost and at fair value:


(In millions)	December 31 2023		December 31 2022
Note receivable, at amortized cost	$	14.0	$	23.9
Note receivable, at fair value	15.4		23.8

Debt and Credit Agreements - Schedule of Maturities of Long Term Debt (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Maturities of Long-term Debt [Abstract]
2025	$ 13,615
2026	434,768
2027	486,442
2028	$ 472,443

Financial Instruments

12 Months Ended

Dec. 31, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Financial Instruments

Off-Balance Sheet Risk

As collateral for the Company's performance and to insurers, the Company is contingently liable under standby letters of credit, bonds, bank guarantees and performance guarantees in the amounts of $489.6 million, $500.4 million and $519.4 million at December 31, 2023, 2022 and 2021, respectively. The expiration periods of the standby letters of credit, bonds and bank guarantees range from less than 1 year to over 5 years, but the majority are generally in force for approximately 2 years. Certain issues have no scheduled expiration date. The Company pays fees to various banks and insurance companies that typically range from approximately 0.2% to 3.0% per annum of the instrument's face value. If the Company were required to obtain replacement standby letters of credit, bonds and bank guarantees at December 31, 2023 for those currently outstanding, it is the Company's opinion that the replacement costs would be within the present fee structure.

The Company has currency exposures in approximately 30 countries. The Company's primary foreign currency exposures during 2023 were in the European Union, the U.K., Brazil and China.

Off-Balance Sheet Risk—Third-Party Guarantees

Any liabilities related to the Company's obligation to stand ready to act on third-party guarantees are included in Other current liabilities or Other liabilities (as appropriate) on the Company's Consolidated Balance Sheets. Any recognition of these liabilities did not have a material impact on the Company's financial position or results of operations for 2023, 2022 or 2021.

In the normal course of business, legal indemnifications are provided related primarily to the performance of the Company's products and services and patent and trademark infringement of the products and services sold. These indemnifications generally relate to the performance (regarding function, not price) of the respective products or services and, therefore, no liability is recognized related to the fair value of such guarantees.

Derivative Instruments and Hedging Activities

The Company uses derivative instruments, including foreign currency exchange forward contracts and interest rate swaps, to manage certain foreign currency and interest rate exposures. Derivative instruments are viewed as risk management tools by the Company and are not used for trading or speculative purposes. All derivative instruments are recorded on the Company's Consolidated Balance Sheets at fair value. The accounting for changes in the fair value of derivatives depends on the intended use of the derivative, whether the Company has elected to designate a derivative in a hedging relationship and apply hedge accounting and whether the hedging relationship has satisfied the criteria necessary to apply hedge accounting. Derivatives designated and qualifying as a hedge of the exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges. Hedge accounting generally provides for the matching of the timing of gain or loss recognition on the hedging instrument with the recognition of the earnings effect of the hedged forecasted transactions in a cash flow hedge. The Company may enter into derivative contracts that are intended to economically hedge certain of its risks, even though hedge accounting does not apply, or the Company elects not to apply hedge accounting.

The Company primarily applies the market approach for recurring fair value measurements and endeavors to utilize the best available information. Accordingly, the Company utilizes valuation techniques that maximize the use of observable inputs, such as forward rates, interest rates, the Company’s credit risk and counterparties’ credit risks, and which minimize the use of unobservable inputs. The Company is able to classify fair value balances based on the ability to observe those inputs. Foreign currency exchange forward contracts and interest rate swaps are based upon pricing models using market-based inputs (Level 2). Model inputs can be verified and valuation techniques do not involve significant management judgment.

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (an exit price). The Company utilizes market data or assumptions that the Company believes market participants would use in valuing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique.

The fair value hierarchy distinguishes between (1) market participant assumptions developed based on market data obtained from independent sources (observable inputs), and (2) an entity’s own assumptions about market participant assumptions based on the best information available in the circumstances (unobservable inputs). The fair value hierarchy consists of three broad levels, which give the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1) and the lowest priority to unobservable inputs (Level 3).

The three levels of the fair value hierarchy are described below:

•Level 1—Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

•Level 2—Inputs, other than quoted prices included within Level 1, that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g., interest rates); and inputs that are derived principally from or corroborated by observable market data by correlation or other means.

•Level 3—Inputs that are both significant to the fair value measurement and unobservable.

In instances in which multiple levels of inputs are used to measure fair value, hierarchy classification is based on the lowest level input that is significant to the fair value measurement in its entirety. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and considers factors specific to the asset or liability.

The fair value of outstanding derivative contracts recorded as assets and liabilities on the Company's Consolidated Balance Sheets was as follows:


(In thousands)	Balance Sheet Location	Fair Value of Derivatives Designated as Hedging Instruments		Fair Value of Derivatives Not Designated as Hedging Instruments		Total Fair Value
December 31, 2023
Asset derivatives (Level 2):
Foreign currency exchange forward contracts	Other current assets	$	77	$	1,597	$	1,674
Interest rate swaps	Other current assets	1,443		—		1,443

Total		$	1,520	$	1,597	$	3,117
Liability derivatives (Level 2):
Foreign currency exchange forward contracts	Other current liabilities	$	561	$	8,064	$	8,625

Interest rate swaps	Other liabilities	2,150		—		2,150
Total		$	2,711	$	8,064	$	10,775
December 31, 2022
Asset derivatives (Level 2):
Foreign currency exchange forward contracts	Other current assets	$	1,042	$	2,154	$	3,196




Total		$	1,042	$	2,154	$	3,196
Liability derivatives (Level 2):
Foreign currency exchange forward contracts	Other current liabilities	$	577	$	4,796	$	5,373


Total		$	577	$	4,796	$	5,373

All of the Company's derivatives are recorded on the Consolidated Balance Sheets at gross amounts and not offset. All of the Company's interest rate swaps and certain foreign currency exchange forward contracts are transacted under ISDA documentation. Each ISDA master agreement permits the net settlement of amounts owed in the event of default. The Company's derivative assets and liabilities are subject to enforceable master netting arrangements which, if offset, would have resulted in a $0.5 million and $0.1 million net liability at December 31, 2023 and 2022, respectively.

The effect of derivative instruments on the Company's Consolidated Statements of Operations and the Consolidated Statements of Comprehensive Income (Loss) was as follows:

Derivatives Designated as Hedging Instruments


	Amount Recognized in OCI on Derivatives						Amount Reclassified from AOCI into Income - Effective Portion or Equity
(In thousands)	2023		2022		2021		2023		2022		2021

Foreign currency exchange forward contracts	$	(1,696)	$	1,966	$	309	$	1,638	$	(1,746)	$	(129)

Interest rate swaps	1,869		—		(42)		(2,576)		4,245		3,474

	$	173	$	1,966	$	267	$	(938)	$	2,499	$	3,345

The locations and amounts of gain (loss) recognized on the Consolidated Statements of Operations are as follows:


	2023
(in thousands)	Interest Expense		Income (Loss) from Discontinued Businesses
Total amounts in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded	$	(103,872)	$	(39,252)
Interest rate swaps:
Gain or (loss) reclassified from AOCI into income	2,576		—

Foreign exchange contracts:
Gain or (loss) reclassified from AOCI into income	—		(1,638)


	2022
(in thousands)	Interest Expense		Income (Loss) From Discontinued Businesses
Total amounts in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded	$	(75,156)	$	(50,301)
Interest rate swaps:
Gain or (loss) reclassified from AOCI into income	(4,245)		—
Amount recognized in earnings due to ineffectiveness	1,862		—
Foreign exchange contracts:
Gain or (loss) reclassified from AOCI into income	—		1,746


	2021
		Interest Expense		Income (Loss) From Discontinued Businesses
Total amounts in the Consolidated Statements of Operations in which the effects of cash flow hedges are recorded		$	(63,235)	$	(25,863)
Interest rate swaps:
Gain or (loss) reclassified from AOCI into income		(3,474)		—
Amount recognized in earnings due to ineffectiveness		89		—
Foreign exchange contracts:
Gain or (loss) reclassified from AOCI into income		—		129

Derivatives Not Designated as Hedging Instruments


	Location of Gain (Loss) Recognized in Income on Derivatives	Amount of Gain (Loss) Recognized in Income on Derivatives for the Twelve Months Ended December 31(a)
(In thousands)		2023		2022		2021
Foreign currency exchange forward contracts	Cost of sales	$	426	$	19,808	$	10,761

(a) These gains (losses) offset amounts recognized in cost of sales sold principally as a result of intercompany or third-party foreign currency exposures.

Foreign Currency Exchange Forward Contracts

The Company conducts business in multiple currencies and, accordingly, is subject to the inherent risks associated with foreign exchange rate movements. Foreign currency-denominated assets and liabilities are translated into U.S. dollars at the exchange rates existing at the respective balance sheet dates, and income and expense items are translated at the average monthly exchange rates during the respective periods.

The Company uses derivative instruments to hedge cash flows related to foreign currency fluctuations. The outstanding foreign currency exchange forward contracts are part of a worldwide program to minimize foreign currency exchange operating income and balance sheet exposure by offsetting foreign currency exposures of certain future payments between the Company and various subsidiaries, suppliers or customers. The unsecured contracts are with major financial institutions. The Company may be exposed to credit loss in the event of non-performance by the contract counterparties. The Company evaluates the creditworthiness of the counterparties and does not expect default by them. Foreign currency exchange forward contracts are used to hedge commitments, such as foreign currency debt, firm purchase commitments and foreign currency cash flows for certain export sales transactions.

Changes in the fair value of derivatives used to hedge foreign currency denominated balance sheet items are reported directly in earnings, along with offsetting transaction gains and losses on the items being hedged. Derivatives used to hedge forecasted cash flows associated with foreign currency commitments may be accounted for as cash flow hedges, as deemed appropriate, if the criteria for hedge accounting are met. Gains and losses on derivatives designated as cash flow hedges are deferred in AOCI, a separate component of equity, and reclassified to earnings in a manner that matches the timing of the earnings impact of the hedged transactions. The ineffective portion of all hedges, if any, is recognized currently in earnings.

The recognized gains and losses offset amounts recognized in cost of sales principally as a result of intercompany or third-party foreign currency exposures. At December 31, 2023 and December 31, 2022, the notional amounts of foreign currency exchange forward contracts were $633.3 million and $573.8 million, respectively. These contracts primarily hedge British pounds sterling and Euros against other currencies and mature through June 2025.

In addition to foreign currency exchange forward contracts, the Company designates certain loans as hedges of net investments in international subsidiaries. The Company recorded pre-tax net gain (loss) of $1.1 million, $(2.6) million and $2.7 million during 2023, 2022 and 2021, respectively, related to hedges of net investments in OCI.

Interest Rate Swaps

The Company uses interest rate swaps in conjunction with certain variable rate debt issuances in order to secure a fixed interest rate. Changes in the fair value attributed to the effect of the swaps’ interest spread and changes in the credit worthiness of the counter-parties are recorded in OCI.

The Company had a series of interest rate swaps that were in effect through 2022 and had the effect of converting $200.0 million of the New Term Loan from a floating interest rate to a fixed interest rate. The fixed rates provided by the swaps replaced the adjusted LIBOR rate in the interest calculation to 3.12% for 2022. In the fourth quarter of 2021, the interest rate swaps were deemed ineffective and, thus, the subsequent changes in fair value were recorded in earnings in the current period. The amounts previously recorded in OCI were amortized into earnings over the remaining maturity of the interest rate swap.

In January 2023, the Company entered into a new series of interest rate swaps with a scheduled maturity date of December 2025. The swaps have the effect of converting $300.0 million of the New Term Loan from a floating interest rate to a fixed interest rate. The fixed rates provided by the swaps replace the adjusted SOFR rate in the interest calculation, ranging from 4.16% to 4.21%.

Fair Value of Other Financial Instruments

The carrying amounts of cash and cash equivalents, accounts receivable, accounts payable, accrued liabilities and short-term borrowings approximate fair value due to the short-term maturities of these assets and liabilities. At December 31, 2023 and 2022, the total fair value of long-term debt, including current maturities, was $1,394.5 million and $1,227.6 million, respectively, compared with a carrying value of $1,429.0 million and $1,364.2 million, respectively. Fair values for debt are based upon pricing models using market-based inputs (Level 2) for similar issues or on the current rates offered to the Company for debt of the same remaining maturities.

Concentrations of Credit Risk

Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and accounts receivables. The Company places cash and cash equivalents with high-quality financial institutions and, by policy, limits the amount of credit exposure to any single institution.

Concentrations of credit risk with respect to accounts receivable exist in HE, which have several large customers throughout the world with significant accounts receivable balances. Consolidation in the global steel industry could result in an increase in concentration of credit risk for the Company. CE also has significant sales to several U.S. customers.

The Company generally does not require collateral or other security to support customer receivables. If a receivable from one or more of the Company's larger customers becomes uncollectible, it could have a material effect on the Company's results of operations or cash flows.

Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SBB
Business Acquisition [Line Items]
Contract estimated forward loss provision for Harsco Rail Segment				$ 32,800	$ 44,500	$ 33,400
SBB \| Contract 2
Business Acquisition [Line Items]
Percentage Complete	85.00%			85.00%
Contract estimated forward loss provision for Harsco Rail Segment	$ 1,200		$ 6,100	$ 7,300
Network Rail
Business Acquisition [Line Items]
Percentage Complete	53.00%			53.00%
Contract estimated forward loss provision for Harsco Rail Segment	$ 9,200			$ 14,400
Reversal of loss			(23,600)
Deutsche Bahn
Business Acquisition [Line Items]
Percentage Complete	40.00%			40.00%
Contract estimated forward loss provision for Harsco Rail Segment	$ 29,200	$ 2,400	$ 8,300	$ 39,900
Discontinued Operations, Held-for-sale
Business Acquisition [Line Items]
Disposal Group, Including Discontinued Operation, Corporate Overhead				$ 4,200

Financial Instruments - Fair Value of Outstanding Derivative Contracts Recorded as Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Asset derivatives (Level 2):	$ 3,117	$ 3,196
Liability derivatives (Level 2)	10,775	5,373
Foreign currency exchange forward contracts \| Other current assets
Derivatives, Fair Value [Line Items]
Asset derivatives (Level 2):	1,674	3,196
Foreign currency exchange forward contracts \| Other current liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives (Level 2)	8,625	5,373
Interest rate swaps \| Other current assets
Derivatives, Fair Value [Line Items]
Asset derivatives (Level 2):	1,443
Interest rate swaps \| Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives (Level 2)	2,150
Fair Value of Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset derivatives (Level 2):	1,520	1,042
Liability derivatives (Level 2)	2,711	577
Fair Value of Derivatives Designated as Hedging Instruments \| Foreign currency exchange forward contracts \| Other current assets
Derivatives, Fair Value [Line Items]
Asset derivatives (Level 2):	77	1,042
Fair Value of Derivatives Designated as Hedging Instruments \| Foreign currency exchange forward contracts \| Other current liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives (Level 2)	561	577
Fair Value of Derivatives Designated as Hedging Instruments \| Interest rate swaps \| Other current assets
Derivatives, Fair Value [Line Items]
Asset derivatives (Level 2):	1,443
Fair Value of Derivatives Designated as Hedging Instruments \| Interest rate swaps \| Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives (Level 2)	2,150
Fair Value of Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset derivatives (Level 2):	1,597	2,154
Liability derivatives (Level 2)	8,064	4,796
Fair Value of Derivatives Not Designated as Hedging Instruments \| Foreign currency exchange forward contracts \| Other current assets
Derivatives, Fair Value [Line Items]
Asset derivatives (Level 2):	1,597	2,154
Fair Value of Derivatives Not Designated as Hedging Instruments \| Foreign currency exchange forward contracts \| Other current liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives (Level 2)	8,064	$ 4,796
Fair Value of Derivatives Not Designated as Hedging Instruments \| Interest rate swaps \| Other current assets
Derivatives, Fair Value [Line Items]
Asset derivatives (Level 2):	0
Fair Value of Derivatives Not Designated as Hedging Instruments \| Interest rate swaps \| Other liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives (Level 2)	$ 0

Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2023

Property, Plant and Equipment [Abstract]

Schedule of property, plant and equipment

PP&E consist of the following:


(In thousands)	Estimated Useful Lives	December 31 2023		December 31 2022
Land	—	$	72,099	$	72,020
Land improvements	5-20 years	17,149		16,750
Buildings and improvements (a)	10-30 years	218,877		217,926
Machinery and equipment (b)	3-20 years	1,652,562		1,513,238
Uncompleted construction	—	59,335		84,472
Gross property, plant and equipment		2,020,022		1,904,406
Less: Accumulated depreciation		(1,356,738)		(1,247,531)
Property, plant and equipment, net		$	663,284	$	656,875

(a) Buildings and improvements include leasehold improvements that are amortized over the shorter of their useful lives or the term of the lease.

(b) Includes information technology hardware and software.

Capital Stock (Details 2) - shares	12 Months Ended
Capital Stock (Details 2) - shares	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Common Stock
Common Stock, Shares, Issued	116,358,520	115,906,393	115,430,042
Treasury stock, beginning balance (in shares)	36,868,880	36,690,847	36,505,672
Common Stock, Shares, Outstanding, Beginning Balance	79,489,640	79,215,546	78,924,370
Vested Restricted Stock Units (in shares)	124,106	87,765	305,535
Stock Issued During Period, Shares, Other			124,077
Stock issued during period, stock appreciation rights (in shares)		23,311	46,739
Shares outstanding at the end of the period	116,884,011	116,358,520	115,906,393
Treasury stock, ending balance (in shares)	37,049,176	36,868,880	36,690,847
Common Stock, Shares, Outstanding	79,834,835	79,489,640	79,215,546
Stock Issued During Period, Shares, Restricted Stock Award, Gross	401,385	341,051
Treasury
Common Stock
Vested Restricted Stock Units (in shares)	57,637	40,304	112,275
Stock Issued During Period, Shares, Other			54,950
Stock issued during period, stock appreciation rights (in shares)		6,640	17,950
Stock Issued During Period, Shares, Restricted Stock Award, Gross	122,659	131,089
Outstanding Shares
Common Stock
Vested Restricted Stock Units (in shares)	66,469	47,461	193,260
Stock Issued During Period, Shares, Other			69,127
Stock issued during period, stock appreciation rights (in shares)		16,671	28,789
Stock Issued During Period, Shares, Restricted Stock Award, Gross	278,726	209,962

Other Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
Other Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Net gains	$ (250)	$ (4,013)	$ (8,902)
Employee termination benefit costs	3,651	6,490	4,766
Costs to exit activities	(5,118)	1,446	663
Impaired asset write-downs	88	641	1,005
Contingent Consideration Adjustments	848	827	0
Other expense	(742)	1,000	(1,254)
Total	(3,219)	4,737	(3,722)
Net gain related to lease modification	(8,100)
Corporate
Segment Reporting Information [Line Items]
Net gains	0	(632)	0
Employee termination benefit costs	275	(294)	1,481
Costs to exit activities	2,692	1,407	0
Contingent Consideration Adjustments	(848)	0	0
Clean Earth
Segment Reporting Information [Line Items]
Net gains	0	(1,512)	0
Employee termination benefit costs	1,399	1,786	433
Costs to exit activities	0	0	23
Impaired asset write-downs	0	59	63
Contingent Consideration Adjustments	0	827	0
Harsco Environmental
Segment Reporting Information [Line Items]
Net gains	(250)	(1,869)	(8,902)
Employee termination benefit costs	1,977	4,998	2,852
Costs to exit activities	(7,810)	39	640
Impaired asset write-downs	$ 88	$ 582	$ 942

Capital Stock (Tables)

12 Months Ended

Dec. 31, 2023

Equity [Abstract]

Schedule of Common Stock Outstanding Roll Forward

The following table summarizes the Company's common stock activity during the period from January 1, 2021 to December 31, 2023:



	Shares Issued	Treasury Shares (a)	Outstanding Shares







Outstanding, January 1, 2021	115,430,042	36,505,672	78,924,370

Shares issued for vested restricted stock units	305,535	112,275	193,260
Shares issued for vested performance stock units	124,077	54,950	69,127
Stock appreciation rights exercised	46,739	17,950	28,789


Outstanding, December 31, 2021	115,906,393	36,690,847	79,215,546

Shares issued for vested restricted stock units	341,051	131,089	209,962

Shares issued for vested restricted stock awards	87,765	40,304	47,461
Stock appreciation rights exercised	23,311	6,640	16,671

Outstanding, December 31, 2022	116,358,520	36,868,880	79,489,640
Shares issued for vested restricted stock units	401,385	122,659	278,726


Shares issued for vested restricted stock awards	124,106	57,637	66,469
Outstanding, December 31, 2023	116,884,011	37,049,176	79,834,835

Schedule of Earnings Per Share, Basic and Diluted


(In thousands, except per share data)	2023		2022		2021
Income (loss) from continuing operations attributable to Enviri Corporation common stockholders	$	(45,519)	$	(137,155)	$	22,137

Weighted-average shares outstanding—basic	79,796		79,493		79,234
Dilutive effect of stock-based compensation	—		—		1,055
Weighted-average shares outstanding—diluted	79,796		79,493		80,289
Income (loss) from continuing operations per common share, attributable to Enviri Corporation common stockholders:
Basic	$	(0.57)	$	(1.73)	$	0.28

Diluted	$	(0.57)	$	(1.73)	$	0.28

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share


(In thousands)	2023	2022	2021
Restricted stock units	1,219	672	—

Stock appreciation rights	2,303	2,092	826
Performance share units	1,341	1,040	865

Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill

The following table reflects the changes in carrying amounts of goodwill by each reporting unit for the years ended December 31, 2023 and 2022:


(In thousands)	Harsco Environmental		Clean Earth		Consolidated Totals
Balance at December 31, 2021	$	399,230	$	483,879	$	883,109

Goodwill impairment	—		(104,580)		(104,580)
Foreign currency translation	(19,276)		—		(19,276)
Balance at December 31, 2022	379,954		379,299		759,253


Foreign currency translation	8,699		—		8,699
Balance at December 31, 2023	$	388,653	$	379,299	$	767,952

Schedule of Acquired Finite-Lived Intangible Assets by Major Class

The following table reflects these intangible assets by major category:


	December 31, 2023				December 31, 2022
(In thousands)	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization
Customer related	$	97,963	$	64,040	$	95,573	$	54,482
Permits	309,679		66,733		309,177		50,703
Technology related	21,803		17,001		20,800		15,491
Trade names	30,409		11,816		30,212		9,198
Air rights	26,139		3,281		26,139		2,411
Patents	206		178		189		155
Non-compete agreement	2,500		2,344		2,500		1,718
Other	3,063		1,508		3,147		1,419
Total	$	491,762	$	166,901	$	487,737	$	135,577

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

The following table shows the estimated amortization expense for the next five fiscal years based on current intangible assets.


(In thousands)	2024		2025		2026		2027		2028
Estimated amortization expense (a)	$	28,000	$	27,800	$	25,900	$	24,600	$	23,000

(a) These estimated amortization expense amounts do not reflect the potential effect of future foreign currency exchange rate fluctuations.

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 24
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482548/350-20-55-24

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
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-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
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-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Section 50
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Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (g)
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-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
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-URI https://asc.fasb.org//1943274/2147482573/350-20-50-1A

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482573/350-20-50-2

+ Details

Information by Segment and Geographic Area (Details 3) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) Customer	Dec. 31, 2022 USD ($) Customer	Dec. 31, 2021 USD ($) Customer
Segment Reporting Information [Line Items]
Revenues	$ 2,069,225	$ 1,889,065	$ 1,848,399
Operating income from continuing operations	111,014	(57,343)	88,376
Total assets	2,854,552	2,790,854	3,053,908
Depreciation	138,956	129,712	131,449
Depreciation Excluding Industrial Segment	138,956	129,712	127,402
Amortization	32,408	34,137	35,224
Amortization Excluding Deferred Financing Costs	32,408	34,137	34,942
Capital Expenditures	136,572	135,542	156,920
Interest income	6,670	3,559	2,231
Interest expense	(103,872)	(75,156)	(63,235)
Defined benefit pension income (expense)	(21,600)	8,938	15,640
Loss on early extinguishment of debt	(10,762)	(2,956)	(5,506)
Income (loss) from continuing operations before income taxes and equity income	$ (18,550)	$ (122,958)	$ 37,506
Number of major customers \| Customer	0	0	0
Harsco Environmental
Segment Reporting Information [Line Items]
Number of major customers \| Customer	1	1	1
Clean Earth
Segment Reporting Information [Line Items]
Operating income from continuing operations	$ 76,974	$ (81,785)	$ 25,639
Total assets	981,723	980,774	1,278,472
Depreciation	23,252	18,836	19,672
Amortization	24,583	24,299	24,180
Capital Expenditures	$ 32,100	21,996	18,403
Number of major customers \| Customer	1
Operating segments
Segment Reporting Information [Line Items]
Operating income from continuing operations	$ 154,609	(22,226)	129,041
Operating segments \| Harsco Environmental
Segment Reporting Information [Line Items]
Revenues	1,140,904	1,061,239	1,068,083
Operating income from continuing operations	77,635	59,559	103,402
Total assets	1,417,278	1,416,717	1,386,087
Depreciation	113,571	108,880	105,830
Amortization	4,030	6,809	8,052
Capital Expenditures	104,045	109,508	137,228
Operating segments \| Clean Earth
Segment Reporting Information [Line Items]
Revenues	928,321	827,826	780,316
Operating segments \| Harsco Industrial
Segment Reporting Information [Line Items]
Total assets	346,163	336,245	333,263
Corporate
Segment Reporting Information [Line Items]
Operating income from continuing operations	(43,595)	(35,117)	(40,665)
Total assets	109,388	57,118	56,086
Depreciation	2,133	1,996	1,900
Amortization	3,795	3,029	2,710
Capital Expenditures	$ 427	$ 4,038	$ 1,289

Debt and Credit Agreements - Outstanding Amounts Under Revolving Credit Facility (Details) - Line of Credit [Member] $ in Thousands	Dec. 31, 2023 USD ($)
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	$ 247,183
Line of Credit Facility, Maximum Borrowing Capacity	700,000
Long-term Line of Credit	422,000
Letters of Credit Outstanding, Amount	$ 30,817

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482900/835-30-50-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
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-Paragraph 1B
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Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
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-Name Accounting Standards Codification
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-Paragraph 69B
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-URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
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-URI https://asc.fasb.org//1943274/2147481568/470-20-55-69C

Reference 7: http://www.xbrl.org/2003/role/exampleRef
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Reference 8: http://www.xbrl.org/2003/role/exampleRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/exampleRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (f)
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Subparagraph (h)
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1E
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
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Reference 20: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1E

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
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Reference 22: http://www.xbrl.org/2003/role/disclosureRef
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Reference 23: http://www.xbrl.org/2003/role/disclosureRef
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Reference 24: http://www.xbrl.org/2003/role/disclosureRef
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Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1I
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1I

+ Details

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References + Details

Employee Benefit Plans (Details 2) - USD ($) $ in Thousands	12 Months Ended
Employee Benefit Plans (Details 2) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Noncurrent liabilities	$ 45,087	$ 46,601
Liabilities of assets held-for-sale	$ 4,029	$ 9,463
Pension Plan
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rates	5.10%	2.10%	1.60%
Expected long-term rates of return on plan assets	5.50%	4.70%	5.10%
Expected long-term rates of return on plan assets for next year (as a percent)	5.70%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rates	4.80%	5.10%
U.S. Plans \| Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 209,182	$ 277,007
Service cost	0	0	$ 0
Interest cost	10,173	5,716	4,813
Plan participants' contributions	0	0
Amendments	0	0
Actuarial loss	5,736	(57,841)
Settlements/curtailments	0	0
Benefits paid	(15,914)	(15,700)
Effect of foreign currency	0	0
Benefit obligation at end of year	209,177	209,182	277,007
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	177,044	232,947
Actual return on plan assets	18,123	(41,909)
Employer contributions	1,674	1,706
Plan participants' contributions	0	0
Settlements/curtailments	0	0
Benefits paid	(15,914)	(15,700)
Effect of foreign currency	0	0
Fair value of plan assets at end of year	180,927	177,044	$ 232,947
Funded status at end of year	(28,250)	(32,138)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Noncurrent assets	0	0
Current liabilities	1,832	1,851
Noncurrent liabilities	26,418	30,287
Total accumulated other comprehensive loss before tax	95,016	105,005
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net actuarial loss	95,016	105,005
Prior service cost	0	0
Total accumulated other comprehensive loss before tax	95,016	$ 105,005
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Estimate of expected contributions in next fiscal year	7,700
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2021	26,000
2022	16,300
2023	16,200
2024	16,100
2025	15,900
2026-2030	$ 75,100
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rates	5.30%	2.70%	2.40%
Expected long-term rates of return on plan assets	7.00%	6.30%	6.80%
Expected long-term rates of return on plan assets for next year (as a percent)	7.00%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rates	5.00%	5.30%
Highest yield U.S. dollar-denominated, AA-graded corporate bonds excluded from yield curve universe (as a percent)	10.00%
Lowest yield U.S. dollar-denominated, AA-graded corporate bonds excluded from yield curve universe (as a percent)	10.00%
International Plans \| Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 597,190	$ 1,022,198
Service cost	1,221	1,867	$ 1,805
Interest cost	30,166	16,500	12,652
Plan participants' contributions	13	14
Amendments	74	0
Actuarial loss	17,899	(299,841)
Settlements/curtailments	(203)	(132)
Benefits paid	(36,650)	(37,135)
Effect of foreign currency	31,785	(106,281)
Benefit obligation at end of year	641,495	597,190	1,022,198
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	607,234	973,252
Actual return on plan assets	40,507	(250,002)
Employer contributions	24,715	22,614
Plan participants' contributions	13	14
Settlements/curtailments	(203)	(132)
Benefits paid	(36,650)	(37,135)
Effect of foreign currency	31,908	(101,377)
Fair value of plan assets at end of year	667,524	607,234	$ 973,252
Funded status at end of year	26,029	10,044
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Noncurrent assets	44,241	26,033
Current liabilities	726	924
Noncurrent liabilities	17,486	15,065
Total accumulated other comprehensive loss before tax	358,763	346,068
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net actuarial loss	350,601	337,849
Prior service cost	8,162	8,219
Total accumulated other comprehensive loss before tax	358,763	$ 346,068
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year [Abstract]
Estimate of expected contributions in next fiscal year	17,600
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2021	37,200
2022	37,800
2023	38,800
2024	39,800
2025	41,300
2026-2030	$ 221,300
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rates	5.10%	1.90%	1.40%
Expected long-term rates of return on plan assets	5.10%	4.40%	4.70%
Expected long-term rates of return on plan assets for next year (as a percent)	5.30%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rates	4.80%	5.10%

Revenue Recognition - Performance Obligation Period Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Harsco Environmental
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 60.6
Harsco Environmental \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance period		1 year
Remaining performance obligation	21.6
Harsco Environmental \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance period		1 year
Remaining performance obligation	19.3
Harsco Environmental \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance period		1 year
Remaining performance obligation	8.0
Harsco Environmental \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance period		1 year
Remaining performance obligation	$ 5.2
Harsco Environmental \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance period		1 year
Harsco Rail \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance period		1 year
Harsco Rail \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance period		1 year
Harsco Rail \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance period		1 year
Harsco Rail \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance period		1 year
Harsco Rail \| Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance period		1 year

Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Inventories
Finished goods	$ 15,565	$ 11,809
Work-in-process	1,114	2,030
Raw materials and purchased parts	23,542	27,946
Stores and supplies	46,071	39,590
Total inventories	86,292	81,375
Valued at lower of cost or market:
LIFO basis	10,532	15,473
FIFO basis	9,265	8,826
Average cost basis	66,495	57,076
Total inventories	86,292	81,375
Excess of inventories valued at current costs over LIFO	13,000	14,000
Change in income as a result of LIFO basis inventory valuation over FIFO basis valuation	$ 1,200	$ 0	$ 0

Recently Adopted and Recently Issued Accounting Standards	12 Months Ended
	Dec. 31, 2023
Accounting Changes and Error Corrections [Abstract]
Recently Adopted and Recently Issued Accounting Standards	Recently Adopted and Recently Issued Accounting Standards The following accounting standards were adopted in 2023: On January 1, 2023, the Company adopted changes issued by the FASB that clarify that an acquirer of a business should recognize and measure contract assets and contract liabilities in a business combination in accordance with accounting standards governing revenue from contracts with customers. The adoption of these changes did not have an immediate impact on the Company's consolidated financial statements, but will be applied prospectively to future business combinations. On January 1, 2023, the Company adopted changes issued by the FASB that require a buyer in a supplier finance program, also referred to as reverse factoring, payables finance, or structured payables arrangements, to disclose sufficient information about the program to allow a user of financial statements to understand the program’s nature, activity during the period, changes from period to period, and potential magnitude, by disclosing qualitative and quantitative information about the program. The adoption of these changes did not have a material impact on the Company's consolidated financial statements, including the notes thereto. The following accounting standards have been issued and become effective for the Company at a future date: In November 2023, the FASB issued changes that require expansion of annual and interim disclosure requirements for reportable segments, primarily through enhanced disclosures about significant segment expenses. The changes become effective starting with the Company's annual financial statements for the year ended December 31, 2024. The Company is currently evaluating the impact that this change will have on the Company's disclosures. In December 2023, the FASB issued changes which require greater disaggregation of income tax disclosures related to the income tax rate reconciliation and income taxes paid. The changes become effective starting with the Company's annual financial statements for the year ended December 31, 2025. The guidance should be applied on a prospective basis with the option to apply the standard retrospectively. Early adoption is permitted. The Company is currently evaluating the impact that this change will have on the Company's disclosures.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480016/944-40-65-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (g)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480016/944-40-65-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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-Section 65
-Paragraph 2
-Subparagraph (g)(2)(iii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480016/944-40-65-2

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
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Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
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-URI https://asc.fasb.org//1943274/2147480530/250-10-S99-5

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
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Reference 11: http://www.xbrl.org/2003/role/disclosureRef
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Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
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Reference 13: http://www.xbrl.org/2003/role/disclosureRef
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Reference 14: http://www.xbrl.org/2003/role/disclosureRef
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-Section 65
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Reference 15: http://www.xbrl.org/2003/role/disclosureRef
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Reference 16: http://www.xbrl.org/2003/role/disclosureRef
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Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482615/740-10-65-8

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 8
-Subparagraph (e)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482615/740-10-65-8

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
-Section 65
-Paragraph 8
-Subparagraph (e)(3)
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Reference 20: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
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Reference 21: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (e)(2)
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Reference 22: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (e)(3)
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Reference 23: http://www.xbrl.org/2003/role/disclosureRef
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-Subparagraph (e)(1)
-Publisher FASB
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Reference 24: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Subparagraph (e)(2)
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Reference 25: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (f)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483194/926-20-65-2

Reference 26: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
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-Name Accounting Standards Codification
-Section 65
-Paragraph 2
-Subparagraph (f)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483194/926-20-65-2

Reference 27: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
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-Name Accounting Standards Codification
-Section 65
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-Subparagraph (f)(3)
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-URI https://asc.fasb.org//1943274/2147483194/926-20-65-2

Reference 28: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 10
-Name Accounting Standards Codification
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-Paragraph 6
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Reference 29: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 30: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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Reference 31: http://www.xbrl.org/2003/role/disclosureRef
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Reference 32: http://www.xbrl.org/2003/role/disclosureRef
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Reference 33: http://www.xbrl.org/2003/role/disclosureRef
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Reference 34: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147481925/310-20-65-2

+ Details

Stock-Based Compensation (Restricted Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended				12 Months Ended
	May 31, 2023	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					1,006,715
Granted (in dollars per share)					$ 7.25
Recognized stock-based compensation expense					$ 4,352	$ 4,335	$ 4,819
Restricted stock unit activity
Nonvested at the beginning of the period (in shares)					671,584
Granted (in shares)					1,006,715
Vested (in shares)					(364,241)
Forfeited (in shares)					(94,737)
Nonvested at the end of the period (in shares)					1,219,321	671,584
Weighted Average Grant-Date Fair Value
Nonvested at the beginning of the period (in dollars per share)					$ 12.51
Granted (in dollars per share)					7.25
Vested (in dollars per share)					11.34
Forfeited (in dollars per share)					10.87
Nonvested at the end of the period (in dollars per share)					$ 8.63	$ 12.51
Additional disclosures
Unrecognized stock-based compensation expense					$ 6,200
Unrecognized stock-based compensation expense, period of recognition					2 years
Fair value of RSU, vested in period					$ 4,100	$ 5,100	4,100
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	29,337	758,965	500,624	316,959	788,302
Granted (in dollars per share)	$ 15.24	$ 10.91	$ 16.54	$ 25.38	$ 11.07
Recognized stock-based compensation expense					$ 5,800	$ 4,200	$ 5,100
Restricted stock unit activity
Nonvested at the beginning of the period (in shares)					661,952
Granted (in shares)	29,337	758,965	500,624	316,959	788,302
Vested (in shares)					(225,667)
Forfeited (in shares)					(116,331)
Nonvested at the end of the period (in shares)					1,108,256	661,952
Weighted Average Grant-Date Fair Value
Nonvested at the beginning of the period (in dollars per share)					$ 19.94
Granted (in dollars per share)	$ 15.24	$ 10.91	$ 16.54	$ 25.38	11.07
Vested (in dollars per share)					25.38
Forfeited (in dollars per share)					16.63
Nonvested at the end of the period (in dollars per share)					$ 12.87	$ 19.94
Additional disclosures
Unrecognized stock-based compensation expense					$ 7,200
Unrecognized stock-based compensation expense, period of recognition					1 year 8 months 12 days
2013 Equity and Incentive Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares authorized for issuance					12,100,000
Number of shares available for grant					3,100,000
2013 Equity and Incentive Compensation Plan \| Equity Awards, Other Than Options And Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares authorized for issuance					8,100,000
Number of shares available for grant					1,900,000
1995 Non-Employee Directors' Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares authorized for issuance					800,000
Number of shares available for grant					181,000
1995 Non-Employee Directors' Stock Plan \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					80,705	63,696	23,224	34,986
Granted (in dollars per share)					$ 9.03	$ 7.85	$ 21.53	$ 10.29
Restricted stock unit activity
Granted (in shares)					80,705	63,696	23,224	34,986
Weighted Average Grant-Date Fair Value
Granted (in dollars per share)					$ 9.03	$ 7.85	$ 21.53	$ 10.29
1995 Non-Employee Directors' Stock Plan \| Restricted stock units \| 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized stock-based compensation expense					$ 0	$ 0	$ 120
1995 Non-Employee Directors' Stock Plan \| Restricted stock units \| 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized stock-based compensation expense					0	167	333
1995 Non-Employee Directors' Stock Plan \| Restricted stock units \| 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized stock-based compensation expense					167	333	0
1995 Non-Employee Directors' Stock Plan \| Restricted stock units \| 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized stock-based compensation expense					$ 516	$ 0	$ 0
1995 Executive Incentive Compensation Plan \| Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					926,010	450,915	343,125	522,087	270,864	242,791
Granted (in dollars per share)					$ 7.09	$ 12.36	$ 18.62	$ 8.22	$ 22.25	$ 19.93
Restricted stock unit activity
Granted (in shares)					926,010	450,915	343,125	522,087	270,864	242,791
Weighted Average Grant-Date Fair Value
Granted (in dollars per share)					$ 7.09	$ 12.36	$ 18.62	$ 8.22	$ 22.25	$ 19.93
1995 Executive Incentive Compensation Plan \| Restricted stock units \| 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized stock-based compensation expense					$ 0	$ 0	$ 142
1995 Executive Incentive Compensation Plan \| Restricted stock units \| 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized stock-based compensation expense					0	314	1,239
1995 Executive Incentive Compensation Plan \| Restricted stock units \| 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized stock-based compensation expense					91	741	1,093
1995 Executive Incentive Compensation Plan \| Restricted stock units \| 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized stock-based compensation expense					910	1,294	1,892
1995 Executive Incentive Compensation Plan \| Restricted stock units \| 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized stock-based compensation expense					1,040	1,486	0
1995 Executive Incentive Compensation Plan \| Restricted stock units \| 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized stock-based compensation expense					$ 1,628	$ 0	$ 0

Income Taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details 3) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. federal income tax expense (benefit), at statutory tax rate of 21%	$ (3,896)	$ (25,821)	$ 7,877
U.S. state income taxes, net of federal income tax benefit	1,044	(929)	(310)
U.S. other domestic deductions and credits	(761)	(594)	(415)
Difference in effective tax rates on international earnings and remittances	(13,311)	(5,779)	(4,488)
Uncertain tax position contingencies and settlements	(768)	(290)	783
Changes in realization of deferred tax assets	14,498	8,263	(5,035)
U.S. non-deductible expenses	1,146	791	936
Nondeductible goodwill impairment	0	19,548	0
PP&E / Intangible asset impairment	2,961	3,150	0
State deferred tax rate changes	304	154	592
Foreign derived intangible income deduction	(785)	(938)	0
Share-based compensation	1,131	1,268	173
Total income tax expense from continuing operations	$ 28,185	$ 10,381	$ 9,089
Annual effective income tax rate	(151.90%)	(8.40%)	24.20%
International	$ 10,108	$ 29,644	$ 71,968
Income Tax Expense (Benefit)	28,185	10,381	9,089
Current Foreign Tax Expense (Benefit)	23,400	17,500
Differences on international earnings and remittances	13,300	5,800
U.S.	(28,658)	(152,602)	$ (34,462)
Income Tax Expense (Benefit), Increase (Decrease) From Prior Year	$ 4,700	$ 7,100

Employee Benefit Plans

12 Months Ended

Dec. 31, 2023

Retirement Benefits [Abstract]

Employee Benefit Plans

Pension Benefits

The Company has defined benefit pension plans covering a certain number of employees. The defined benefits for salaried employees generally are based on years of service and the employee's level of compensation during specified periods of employment. Defined benefit pension plans covering hourly employees generally provide benefits of stated amounts for each year of service. MEPPs in which the Company participates provide benefits to certain unionized employees. The Company's funding policy for qualified plans is consistent with statutory requirements. Periodic voluntary contributions are made, as recommended, by the Company's Pension Committee.

Accrued service is no longer granted to the U.S. defined benefit pension plans and a majority of international defined benefit pension plans due to the plans being frozen. In place of these plans, the Company has established defined contribution plans providing for the Company to contribute a specified matching amount for participating employees' contributions to the plan. For U.S. employees, this match is made on employee contributions up to 4% of eligible compensation. Additionally, the Company may provide a discretionary contribution for eligible employees. There have been no discretionary contributions provided for the years 2023, 2022 and 2021. For non-U.S. employees, this match is up to 6% of eligible compensation with an additional 2% going towards insurance and administrative costs.

Changes in the discount rate assumption and the actual performance of plan assets, compared with the expected long-term rate of return on plan assets, are the primary drivers in the change in funded status of the Company's defined benefit pension plans. These factors are components of actuarial loss (gain) and impact the amount recognized in AOCI, as such actuarial changes are not reflected directly on the Consolidated Statements of Operations but amortized over time as permitted by U.S. GAAP.

NPPC from continuing operations for U.S. and international plans for 2023, 2022 and 2021 is as follows:


	U.S. Plans						International Plans
(In thousands)	2023		2022		2021		2023		2022		2021
Net Periodic Pension Cost (Income):
Defined benefit pension plans:
Service cost	$	—	$	—	$	—	$	1,221	$	1,867	$	1,805
Interest cost	10,173		5,716		4,813		30,166		16,500		12,652
Expected return on plan assets	(7,000)		(10,795)		(12,199)		(31,198)		(38,891)		(45,018)
Recognized prior service costs	—		—		—		519		534		582
Recognized losses	4,601		4,732		5,538		14,316		13,060		18,119

Settlement/curtailment loss (gain)	—		—		—		(42)		(33)		(6)
Defined benefit pension plan cost (income)	7,774		(347)		(1,848)		14,982		(6,963)		(11,866)
Multiemployer pension plans	595		642		640		1,209		1,114		1,035
Defined contribution plans	6,656		5,401		5,660		4,123		4,122		4,196
Net periodic pension cost (income)	$	15,025	$	5,696	$	4,452	$	20,314	$	(1,727)	$	(6,635)

The change in the financial status of the defined benefit pension plans and amounts recognized on the Consolidated Balance Sheets at December 31, 2023 and 2022 are as follows:


	U.S. Plans				International Plans
(In thousands)	2023		2022		2023		2022
Change in benefit obligation:
Benefit obligation at beginning of year	$	209,182	$	277,007	$	597,190	$	1,022,198
Service cost	—		—		1,221		1,867
Interest cost	10,173		5,716		30,166		16,500
Plan participants' contributions	—		—		13		14
Amendments	—		—		74		—
Actuarial (gain) loss	5,736		(57,841)		17,899		(299,841)
Settlements/curtailments	—		—		(203)		(132)
Benefits paid	(15,914)		(15,700)		(36,650)		(37,135)
Effect of foreign currency	—		—		31,785		(106,281)


Benefit obligation at end of year	$	209,177	$	209,182	$	641,495	$	597,190
Change in plan assets:
Fair value of plan assets at beginning of year	$	177,044	$	232,947	$	607,234	$	973,252
Actual return on plan assets	18,123		(41,909)		40,507		(250,002)
Employer contributions	1,674		1,706		24,715		22,614
Plan participants' contributions	—		—		13		14
Settlements/curtailments	—		—		(203)		(132)
Benefits paid	(15,914)		(15,700)		(36,650)		(37,135)
Effect of foreign currency	—		—		31,908		(101,377)


Fair value of plan assets at end of year	$	180,927	$	177,044	$	667,524	$	607,234

Funded status at end of year	$	(28,250)	$	(32,138)	$	26,029	$	10,044

Significant items impacting actuarial gains and losses for 2023 for U.S. and U.K. plans included the actual return on the fair value of plan assets since the prior measurement date was greater than assumed, which caused the funded position to improve; partially offset by a decrease in the discount rate used to measure the benefit obligation compared with the prior year, which caused deterioration in the funded position.

Amounts recognized on the Consolidated Balance Sheets for defined benefit pension plans consist of the following at December 31, 2023 and 2022:


	U.S. Plans				International Plans
	December 31				December 31
(In thousands)	2023		2022		2023		2022
Noncurrent assets	$	—	$	—	$	44,241	$	26,033
Current liabilities	1,832		1,851		726		924
Noncurrent liabilities	26,418		30,287		17,486		15,065


AOCI	95,016		105,005		358,763		346,068

Amounts recognized in AOCI for defined benefit pension plans consist of the following at December 31, 2023 and 2022:


	U.S. Plans				International Plans
(In thousands)	2023		2022		2023		2022
Net actuarial loss	$	95,016	$	105,005	$	350,601	$	337,849
Prior service cost	—		—		8,162		8,219

Total	$	95,016	$	105,005	$	358,763	$	346,068

The Company's estimate of expected contributions to be paid in 2024 for the U.S. and international defined benefit plans total $7.7 million and $17.6 million, respectively.

Future Benefit Payments

Expected benefit payments for defined benefit pension plans over the next ten years are as follows:


(In millions)	2024		2025		2026		2027		2028		2029-2033
U.S. Plans	$	26.0	$	16.3	$	16.2	$	16.1	$	15.9	$	75.1
International Plans	37.2		37.8		38.8		39.8		41.3		221.3

Net Periodic Pension Cost and Defined Benefit Pension Obligation Assumptions

The weighted-average actuarial assumptions used to determine the defined benefit pension plan NPPC for 2023, 2022 and 2021 were as follows:


	U.S. Plans December 31						International Plans December 31						Global Weighted-Average December 31
	2023		2022		2021		2023		2022		2021		2023		2022		2021
Discount rates	5.3	%	2.7	%	2.4	%	5.1	%	1.9	%	1.4	%	5.1	%	2.1	%	1.6	%
Expected long-term rates of return on plan assets	7.0	%	6.3	%	6.8	%	5.1	%	4.4	%	4.7	%	5.5	%	4.7	%	5.1	%

The expected long-term rates of return on defined benefit pension plan assets for the 2024 NPPC are 7.0% for the U.S. plans and 5.3% for the international plans. The expected global long-term rate of return on assets for 2024 is 5.7%.

The weighted-average actuarial assumptions used to determine the defined benefit pension plan obligations at December 31, 2023 and 2022 were as follows:


	U.S. Plans				International Plans				Global Weighted-Average
	December 31				December 31				December 31
	2023		2022		2023		2022		2023		2022
Discount rates	5.0	%	5.3	%	4.8	%	5.1	%	4.8	%	5.1	%

Since accrued service is no longer granted to the U.S. defined benefit plans and the majority of the international defined benefit pension plans, the rate of compensation increase did not have a significant impact on the defined benefit pension obligation at December 31, 2023 and 2022 or the defined benefit pension plan NPPC for the years ended 2023, 2022 and 2021.

The U.S. discount rate was determined using a yield curve that was produced from a universe containing approximately 1,100 U.S. dollar-denominated, AA-graded corporate bonds, all of which were noncallable (or callable with make-whole provisions) and excluding the 10% of the bonds with the highest deviation from the expected yield and the 10% with the lowest deviation from the expected yield within each duration group. The discount rate was then developed as the level-equivalent rate that would produce the same present value as that using spot rates to discount the projected benefit payments. For international plans, the discount rate is aligned to corporate bond yields in the local markets, normally AA-rated corporations. The process and selection seek to approximate the cash inflows with the timing and amounts of the expected benefit payments.

Accumulated Benefit Obligation

The accumulated benefit obligation for all defined benefit pension plans at December 31, 2023 and 2022 was as follows:


	U.S. Plans				International Plans
	December 31				December 31
(In millions)	2023		2022		2023		2022
Accumulated benefit obligation	$	209.2	$	209.2	$	636.4	$	593.4

Defined Benefit Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets


	U.S. Plans				International Plans
	December 31				December 31
(In millions)	2023		2022		2023		2022
Projected benefit obligation	$	209.2	$	209.2	$	27.8	$	25.3
Accumulated benefit obligation	209.2		209.2		24.1		22.6
Fair value of plan assets	180.9		177.0		9.7		9.4


	Target Long-Term Allocation	Percentage of Plan Assets December 31
U.S. Plans Asset Category		2023		2022
Domestic equity securities	6%-16%	10.7	%	21.0	%
International equity securities	22%-32%	24.3	%	22.2	%
Fixed income securities	51%-61%	52.8	%	44.6	%
Cash and cash equivalents	Less than 5%	0.9	%	1.0	%
Other (a)	1%-11%	11.3	%	11.2	%

(a) Investments within this caption include diversified global asset allocation funds and credit collection funds.

Defined benefit pension plan assets are allocated among various categories of equities, fixed income securities and cash and cash equivalents with professional investment managers whose performance is actively monitored. The primary investment objective is long-term growth of assets in order to meet present and future benefit obligations. The Company periodically conducts an asset/liability modeling study and accordingly adjusts investments among and within asset categories to ensure the long-term investment strategy is aligned with the profile of benefit obligations.

The Company reviews the long-term expected return on asset assumption on a periodic basis considering a variety of factors including historical investment returns achieved over a long-term period, the targeted allocation of plan assets and future expectations based on a model of asset returns for an actively managed portfolio. The model simulates 1,000 different capital market results over 20 years. The expected return-on-asset assumption for U.S. defined benefit pension plans for both 2024 and 2023 is 7.0%.

The U.S. defined benefit pension plans' assets include 310,000 shares at December 31, 2023 and 310,000 shares at December 31, 2022 of the Company's common stock, valued at $2.8 million and $2.0 million, respectively. These shares represented 1.5% and 1.1% of total U.S. plan assets at December 31, 2023 and 2022, respectively.


International Plans Asset Category	Target Long-Term Allocation		Percentage of Plan Assets December 31
			2023		2022
Equity securities	16.0	%	10.8	%	24.8	%
Fixed income securities	78.0	%	83.3	%	65.5	%
Cash and cash equivalents	—		0.5	%	1.5	%
Other (b)	6.0	%	5.4	%	8.2	%

(b) Investments within this caption include diversified growth funds and real estate funds.

International defined benefit pension plan assets at December 31, 2023 in the U.K. defined benefit pension plan totaled approximately 94% of the international defined benefit pension plan assets. The U.K. plan assets are allocated among various categories of equities, fixed income securities and cash and cash equivalents with professional investment managers whose performance is actively monitored. The primary investment objective is long-term growth of assets in order to meet present and future benefit obligations. The Company periodically conducts asset/liability modeling studies and accordingly adjusts investment amounts within asset categories to ensure the long-term investment strategy is aligned with the profile of benefit obligations.

For the international long-term rate of return assumption, the Company considered the current level of expected returns in risk-free investments (primarily government bonds), the historical level of the risk premium associated with other asset classes in which the portfolio is invested, and the expectations for future returns of each asset class and plan expenses. The expected return for each asset class is then weighted based on the target asset allocation to develop the expected long-term rate of return on assets. The expected return on asset assumption for the U.K. defined benefit pension plan for 2024 and 2023 are 5.3% and 5.0%, respectively. The remaining international defined benefit pension plans, with plan assets representing approximately 6% of the international defined benefit pension plan assets, are under the guidance of professional investment managers and have similar investment objectives.

The fair values of the Company's U.S. defined benefit pension plans' assets at December 31, 2023 by asset class are as follows:


(In thousands)	Total		Level 1		Investments Valued at Net Asset Value (c)
Domestic equities:
Common stocks	$	2,791	$	2,791	$	—
Mutual funds—equities	16,583		16,583		—
International equities:

Mutual funds—equities	43,994		43,994		—
Fixed income investments:
U.S. Treasuries and collateralized securities	13,920		13,920		—

Mutual funds—bonds	81,634		81,634		—
Other—mutual funds	4,913		4,913		—
Cash and money market accounts	1,661		1,661		—
Other—partnerships/joint ventures	15,431		—		15,431
Total	$	180,927	$	165,496	$	15,431

(c) Certain investments that are measured at fair value using Net Asset Value per share (or its equivalent) as a practical expedient have not been classified in the fair value hierarchy.

The fair values of the Company's U.S. defined benefit pension plans' assets at December 31, 2022 by asset class are as follows:


(In thousands)	Total		Level 1		Investments Valued at Net Asset Value
Domestic equities:
Common stocks	$	1,951	$	1,951	$	—
Mutual funds—equities	35,177		35,177		—
International equities:

Mutual funds—equities	39,287		39,287		—
Fixed income investments:


Mutual funds—bonds	78,943		78,943		—
Other—mutual funds	6,699		6,699		—
Cash and money market accounts	1,780		1,780		—
Other - partnerships/joint ventures	13,207		—		13,207
Total	$	177,044	$	163,837	$	13,207

The fair values of the Company's international defined benefit pension plans' assets at December 31, 2023 by asset class are as follows:


(In thousands)	Total		Level 1		Level 2
Equity securities:
Mutual funds—equities	$	71,755	$	—	$	71,755
Fixed income investments:
Mutual funds—bonds	551,701		—		551,701
Insurance contracts	4,631		—		4,631
Other:

Other mutual funds	36,188		—		36,188
Cash and money market accounts	3,249		3,249		—
Total	$	667,524	$	3,249	$	664,275

The fair values of the Company's international defined benefit pension plans' assets at December 31, 2022 by asset class are as follows:


(In thousands)	Total		Level 1		Level 2
Equity securities:
Mutual funds—equities	$	150,813	$	—	$	150,813
Fixed income investments:

Mutual funds—bonds	392,960		—		392,960
Insurance contracts	4,636		—		4,636
Other:

Other mutual funds	49,805		—		49,805
Cash and money market accounts	9,020		9,020		—
Total	$	607,234	$	9,020	$	598,214

The following is a description of the valuation methodologies used for the defined benefit pension plans' investments measured at fair value:

•Level 1 Fair Value Measurements—Investments in interest-bearing cash are stated at cost, which approximates fair value. The fair values of money market accounts and certain mutual funds are based on quoted net asset values of the shares held by the plan at year-end. The fair values of domestic and international stocks and corporate bonds, notes and convertible debentures are valued at the closing price reported in the active market on which the individual securities are traded.

•Level 2 Fair Value Measurements—The fair values of investments in mutual funds for which quoted net asset values in an active market are not available are valued by the investment advisor based on the current market values of the underlying assets of the mutual fund based on information reported by the investment consistent with audited financial statements of the mutual fund. Further information concerning these mutual funds may be obtained from their separate audited financial statements. Investments in U.S. Treasury notes and collateralized securities are valued based on yields currently available on comparable securities of issuers with similar credit ratings.

Multiemployer Pension Plans

The Company, through HE, contributes to several MEPPs under the terms of collective-bargaining agreements that cover union-represented employees, many of whom are temporary in nature. The Company's total contributions to MEPPs were $1.9 million, $1.9 million and $1.7 million for the years ended December 31, 2023, 2022 and 2021, respectively.

- Definition

The entire disclosure for retirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 70
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480794/715-70-50-1

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(03)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (q)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (l)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//715/tableOfContent

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)(iii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (o)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (p)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (r)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (r)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480126/715-20-S99-2

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480266/715-60-50-3

+ Details

Stock-Based Compensation - Other Stock Grants (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2022	Dec. 31, 2023
Share-Based Payment Arrangement [Abstract]
Stock, Common Stock, Compensation, Value	$ 100
Stock Issued During Period, Shares, New Issues		124,106
Share-Based Compensation Arrangement by Share-Based Payment Award, Per Share Weighted Average Price of Shares Issued		$ 7.64
Compensation Arrangement with Individual, Compensation Expense	$ 900

Commitments and Contingencies

12 Months Ended

Dec. 31, 2023

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Environmental

The Company is involved in a number of environmental remediation investigations and cleanups and, along with other companies, has been identified as a “potentially responsible party” for certain byproduct disposal sites. While each of these matters is subject to various uncertainties, it is probable that the Company will agree to make payments toward funding certain of these activities, and it is possible that some of these matters will be decided unfavorably to the Company. The Company has evaluated its potential liability and its financial exposure is dependent upon such factors as the continuing evolution of environmental laws and regulatory requirements, the availability and application of technology, the allocation of cost among potentially responsible parties, the years of remedial activity required and the remediation methods selected.

The Company evaluates its liability for future environmental remediation costs on a quarterly basis. Although actual costs to be incurred at identified sites in future periods may vary from the estimates (given inherent uncertainties in evaluating environmental exposures), the Company does not expect that any costs that are reasonably possible to be incurred by the Company in connection with environmental matters in excess of the amounts accrued would have a material adverse effect on the Company's financial condition, results of operations or cash flows.

The following table summarizes information related to the location and undiscounted amount of the Company's environmental liabilities:


(In thousands)	December 31 2023		December 31 2022
Current portion of environmental liabilities (a)	$	7,530	$	7,120
Long-term environmental liabilities	25,682		26,880
Total environmental liabilities	$	33,212	$	34,000

(a) The current portion of environmental liabilities is included in the caption Other current liabilities on the Consolidated Balance Sheets.

Legal Proceedings

In the ordinary course of business, the Company is a defendant or party to various claims and lawsuits, including those discussed below. Unless stated otherwise below, the Company has not determined a loss to be probable or estimable for the legal proceedings.

In November 2022, the EPA and the Kentucky Department for Environmental Protection (the “KDEP”) conducted an inspection of Clean Earth of Calvert City LLC’s facility in Calvert City, KY. In September of 2023, the EPA verbally proposed a civil penalty of $775,000 to address alleged violations identified at the time of the inspection. The Company recorded a liability during the year ended December 31, 2023 of $700,000 and is still assessing the alleged violations and is engaging with the EPA to resolve this matter.

On March 28, 2018, the EPA conducted an inspection of ESOL’s offsite waste management facility in Detroit, MI. On November 23, 2021, the EPA proposed a civil penalty of $390,092 as part of a proposed Administrative Consent Order for alleged improper air emissions at the site. The allegations in the proposed Administrative Consent Order and civil penalty relate exclusively to the period prior to the Company’s purchase of the ESOL business. The Company and EPA have reached an agreement and have entered into a consent order to settle the EPA's claim for $270,000, which was paid during the year ended December 31, 2023.

On January 27, 2020, the EPA issued a Notice of Potential Liability to the Company, along with several other companies, concerning the Newtown Creek Superfund Site located in Kings and Queens Counties in New York. The Notice alleges certain facilities formerly owned or operated by subsidiaries of the Company may have resulted in the discharge of hazardous substances into Newtown Creek or its Dutch Kills tributary. The site has been subject to CERCLA response activities since approximately 2011. The U.S. EPA expects to issue a Record of Decision for the sitewide cleanup plan no sooner than 2028 and announced, in July 2021, that it would defer its decision on a potential early action response for the lower two miles of the Creek until the sitewide studies are completed. The Company is one of approximately twenty (20) Potentially Responsible Parties ("PRPs") that have received notices, though it is believed other PRPs may exist. The Company vigorously contests the allegations of the Notice and currently does not believe that this matter will have a material effect on the Company’s financial position or results from operations.

On June 25 and 26, 2018, the DTSC conducted a compliance enforcement inspection of ESOL’s facility in Rancho Cordova, California, which was then owned by Stericycle, Inc. On February 14, 2020, the DTSC filed an action in the Superior Court for the State of California, Sacramento Division, alleging violations of California’s Hazardous Waste Control Law and the facility’s hazardous waste permit arising from the inspection. On August 27, 2020 the DTSC issued a Notice of Denial of Hazardous Waste Facility Permit Application, denying the renewal of the facility's hazardous waste permit. The Company has exhausted its legal challenges to the denial of the Hazardous Waste facility permit, and the hazardous waste facility is in the process of closing. The Company continues to utilize the site for non-hazardous waste and is evaluating additional potential alternate uses for the site. The DTSC investigation and compliance issues leading to the compliance tier assignment were ongoing well before the Company's acquisition of the ESOL business, and the Company was aware of the investigation and many of the issues raised in the investigation at the time of the purchase. Accordingly, the Company is indemnified for certain fines and other costs and expenses associated with this matter by Stericycle, Inc. The Company has not accrued any amounts in respect of these alleged violations and cannot estimate the reasonably possible loss or the range of reasonably possible losses that it may incur.

The Company has had ongoing meetings with the SCE over processing salt cakes, a processing byproduct, stored at the Al Hafeerah site. The Company’s Bahrain operations that produced the salt cakes has ceased operations. An Environmental Impact Assessment and Technical Feasibility Study for facilities to process the salt cakes was approved by the SCE during the first quarter of 2018. Commissioning of the facilities was completed during the third quarter of 2021 and the processing of the salt cakes has commenced. The Company's current reserve of $5.3 million at December 31, 2023 continues to represent the Company's best estimate of the ultimate costs to be incurred to resolve this matter. The Company continues to evaluate this reserve and any future change in estimated costs, which could be material to the Company’s results of operations in any one period.

On July 27, 2018 Brazil’s Federal and Rio de Janeiro State Public Prosecution Offices (the "MPF" and "MPE", respectively) filed a Civil Public Action against CSC, one of the Company's customers, the Company’s Brazilian subsidiary, the Municipality of Volta Redonda, Brazil, and the Instituto Estadual do Ambiente (local environmental protection agency) seeking the implementation of various measures to limit and reduce the accumulation of customer-owned slag at the site in Brazil. On August 6, 2018 the 3rd Federal Court in Volta Redonda (the "Volta Redonda Court") granted the MPF and MPE an injunction against the same parties requiring, among other things, CSN and the Company’s Brazilian subsidiary to limit the volume of slag sent to the site. Because the customer owns the site and the slag located on the site, the Company believes that complying with this injunction is the steel producer’s responsibility. Nevertheless, the Volta Redonda Court issued two orders fining the Company and CSN for what it views as ongoing violations of the injunction. The Company is appealing the fines and the underlying injunction. Both the Company and CSN continue to have discussions with the MPF, MPE and the governmental authorities regarding the injunction and the possible resolution of the underlying case. Beginning on March 25, 2022, the Courts entered a series of orders suspending the litigation proceedings and staying any additional fines and interest accruals while the parties discuss a possible resolution to the matter. The aggregate amount of fines levied against the Company, exclusive of interest, is approximately 32 million Brazilian reais (or approximately $6.6 million) as of December 31, 2023. The Company does not believe that a loss relating to this matter is probable or estimable at this point.

On October 19, 2018 local environmental authorities issued an enforcement action against the Company concerning the Company’s operations at a customer site in Ijmuiden, Netherlands. The enforcement action alleged violations of the Company’s environmental permit at the site, which restricts the release of any visible dust emissions. On January 12, 2022, the Administrative Supreme Court of the Netherlands upheld the Company’s challenge of these enforcement actions as they relate to the slag tipping area of the site. As a result, all fines asserted against the Company to date have been invalidated and all fines paid to date have been reimbursed. This order is not appealable. On or about October 14, 2021, the Company received a subpoena and two indictments before the Amsterdam District Court in the Netherlands. The Amsterdam Public Prosecutor’s Office ("APPO") issued two indictments against the Company, alleging violations in connection with dust releases and/or events alleged to have occurred in 2018 through May 2020 at the site. The action cites provisions which permit fines for the alleged infractions and seeks €100,000 in fines with a smaller amount held in abeyance. On February 2, 2022, the APPO announced that it would further investigate residents’ claims related to this matter. On February 25, 2022, the Amsterdam District Court ruled that the Company was liable for only one alleged violation and that this alleged violation was unintentional. The court issued a fine of €5,000, to be held in abeyance. Both the Company and the APPO have appealed this ruling. The Company is vigorously contesting all allegations against it and is also working with its customer to ensure the control of emissions. The Company has contractual indemnity rights from its customer that it believes will substantially cover any fines or penalties.

On March 22, 2022, the EPA issued a Notice of Intent to File an Administrative Complaint ("NOI") alleging violations of the federal Emergency Planning and Community Right-to-Know Act at the Company’s facilities in Tacoma, WA and Kent, WA. The NOI relates exclusively or almost exclusively to the period when Stericycle owned and operated the sites. The NOI proposes a penalty of $3,000,000. The Company is currently reviewing the veracity of the allegations and the corresponding proposed penalty amount and has recorded a liability of $600,000 as its best estimate to resolve this matter. While it is the Company’s position that it has recourse for some or all liabilities, if any, that arise from this matter under the ESOL purchase agreement and representations and warranties insurance policies purchased by the Company, there can be no assurances that the Company’s position will ultimately prevail.

DEA Investigation

Prior to the Company’s acquisition of ESOL, Stericycle, Inc., notified the Company that the DEA had served an administrative subpoena on Stericycle, Inc. and executed a search warrant at a facility in Rancho Cordova, CA and an administrative inspection warrant at a facility in Indianapolis, IN. The Company has determined that the DEA and the DTSC have launched investigations involving, at least in part, the ESOL business of collecting, transporting, and destroying controlled substances from retail customers that transferred from Stericycle, Inc. to the Company. The Company is cooperating with these inquiries, which relate primarily to the period before the Company owned the ESOL business. Since the acquisition of the ESOL business, the Company has performed a vigorous review of ESOL’s compliance program related to controlled substances and has made material changes to the manner in which controlled substances are transported from retail customers to DEA-registered facilities for destruction. Pursuant to an agreement with Stericycle, the Company has contractual recourse for any material loss the Company has determined is reasonably possible. The Company has not accrued any amounts in respect of these investigations and does not believe a loss is reasonably possible.

Brazilian Tax Disputes

The Company is involved in a number of tax disputes with federal, state and municipal tax authorities in Brazil. These disputes are at various stages of the legal process, including the administrative review phase and the collection action phase, and include assessments of fixed amounts of principal and penalties, plus interest charges that increase at statutorily determined amounts per month and are assessed on the aggregate amount of the principal and penalties. In addition, the losing party, at the collection action or court of appeals phase, could be subject to a charge to cover statutorily mandated legal fees, which are generally calculated as a percentage of the total assessed amounts due, inclusive of penalty and interest. Many of the claims relate to ICMS, services and social security tax disputes. The largest proportion of the assessed amounts relate to ICMS claims filed by the SPRA, encompassing the period from January 2002 to May 2005.

In October 2009 the Company received notification of the SPRA’s final administrative decision regarding the levying of ICMS in the State of São Paulo in relation to services provided to a customer in the State between January 2004 and May 2005. As of December 31, 2023, the principal amount of the tax assessment from the SPRA with regard to this case is approximately $1.3 million, with penalty, interest and fees assessed to date increasing such amount by an additional $19.1 million. On June 4, 2018, the Appellate Court of the State of São Paulo ruled in favor of the SPRA, but ruled that the assessed penalty should be reduced to approximately $1.3 million. After calculating the interest accrued on the penalty, the Company estimates that this ruling reduced the current overall potential liability for this case to approximately $7.6 million. All such amounts include the effect of foreign currency translation. The Company has appealed the ruling in favor of the SPRA to the Superior Court of Justice. Due to multiple court precedents in the Company's favor, as well as the Company's ability to appeal, the Company does not believe a loss is probable.

Another ICMS tax case involving the SPRA refers to the tax period from January 2002 to December 2003. In December 2018, the administrative tribunal hearing the case upheld the Company's liability. The aggregate amount assessed by the tax authorities in August 2005 was $5.2 million (the amounts with regard to this claim are valued as of the date of the assessment since it has not yet reached the collection phase), composed of a principal amount of $1.2 million, with penalty and interest assessed through that date increasing such amount by an additional $4.0 million. On December 6, 2018, the administrative tribunal reduced the applicable penalties to $0.6 million. After calculating the interest accrued on the current penalty through December 31, 2023, the Company estimates that the current overall liability for this case to be approximately $5.7 million. All such amounts include the effect of foreign currency translation. The Company has appealed to the judicial phase at the Third Trial Court of the District of Cubatão, State of São Paulo. On October 14, 2022, the District Court issued a decision holding that the Company is not liable for the taxes at issue. The SPRA appealed this decision on December 28, 2022 and this appeal is pending review by the Appellate Court of the State of São Paulo. Due to multiple court precedents in the Company's favor, the Company does not believe a loss is probable.

The Company continues to believe that sufficient coverage for these claims exists as a result of the indemnification obligations of the Company's customer and such customer’s pledge of assets in connection with the October 2009 notice, as required by Brazilian law.

On December 30, 2020, the Company received an assessment from the municipal authority in Ipatinga, Brazil alleging $2.2 million in unpaid service taxes from the period 2015 to 2020. After calculating the interest and penalties accrued, the Company estimates that the current overall potential liability for this case to be approximately $5.9 million. On January 18, 2021, the Company filed a challenge to the assessment and a final administrative decision is still pending. Due to the multiple defenses that are available, the Company does not believe a loss is probable.

The Company intends to continue its practice of vigorously defending itself against these tax claims under various alternatives, including judicial appeal. The Company will continue to evaluate its potential liability with regard to these claims on a quarterly basis; however, it is not possible to predict the ultimate outcome of these tax-related disputes in Brazil. No loss provision has been recorded in the Company's consolidated financial statements for the disputes described above because the loss contingency is not deemed probable, and the Company does not expect that any costs that are reasonably possible to be incurred by the Company in connection with Brazilian tax disputes would have a material adverse effect on the Company's financial condition, results of operations or cash flows.

Asbestos Actions

The Company is named as one of many defendants in legal actions in the U.S. alleging personal injury from exposure to airborne asbestos over the past several decades. In their suits, the plaintiffs have named as defendants, among others, many manufacturers, distributors and installers of numerous types of equipment or products that allegedly contained asbestos.

As of December 2023, there were approximately 17,000 pending asbestos personal injury actions filed against the Company. The vast majority of these actions were filed in the New York Supreme Court (New York County), of which the majority of such actions were on the Deferred/Inactive Docket created by the court in December 2002 for all pending and future asbestos actions filed by persons who cannot demonstrate that they have a malignant condition or discernible physical impairment. A relatively small portion of cases are on the Active or In Extremis docket in New York County or on active dockets in other jurisdictions. The complaints in most of those actions generally follow a form that contains a standard demand of significant damages, regardless of the individual plaintiff's alleged medical condition, and without identifying any Company product.

The Company will continue to vigorously defend against such claims and is confident that it will be successful in doing so. The Company has never been a producer, manufacturer or processor of asbestos fibers. Any asbestos-containing part of a Company product used in the past was purchased from a supplier and the asbestos encapsulated in other materials such that airborne exposure, if it occurred, was not harmful and is not associated with the types of injuries alleged in the pending actions.

The Company has liability insurance coverage under various primary and excess policies that the Company believes will be available, if necessary, to substantially cover any liability that might ultimately be incurred in the asbestos actions referred to above. The costs and expenses of the asbestos actions are being paid by the Company’s insurers.

In view of the persistence of asbestos litigation in the U.S., the Company expects to continue to receive additional claims in the future. The Company intends to continue its practice of vigorously defending these claims and cases. As of December 2023, the Company has successfully dismissed approximately 28,500 cases by stipulation or summary judgment prior to trial.

It is not possible to predict the ultimate outcome of asbestos-related actions in the U.S. due to the unpredictable nature of this litigation, and no loss provision has been recorded in the Company's consolidated financial statements because a loss contingency is not deemed probable or estimable. Despite this uncertainty, and although results of operations and cash flows for a given period could be adversely affected by asbestos-related actions, the Company does not expect that any costs that are reasonably possible to be incurred by the Company in connection with asbestos litigation would have a material adverse effect on the Company's financial condition, results of operations or cash flows.

Other

On November 5, 2020, a worker suffered a fatal injury at a site owned by the Company’s customer, Gerdau Ameristeel US, Inc., ("Gerdau") in Midlothian, TX. Although the Company was not directly involved in the accident, the worker was employed by a sub-contractor of a sub-contractor of the Company. The worker’s family filed suit in the 125th Judicial District Court of Harris County, TX against multiple parties, including the Company, seeking monetary damages. On May 11, 2023, parties completed a formal settlement agreement, settling the claims brought by the worker's family. The Company paid its insurance deductible of $5.0 million and has recorded an indemnification receivable from Gerdau for the recovery of certain losses based upon the contractual indemnity rights. On August 25, 2023, the Company initiated arbitration proceedings against Gerdau before the American Arbitration Association to enforce its contractual indemnity rights. There can be no assurances that the Company's position will ultimately prevail; however, any financial statement impact is not expected to be material.

The Company is subject to various other claims and legal proceedings covering a wide range of matters that arose in the ordinary course of business. In the opinion of management, all such matters are adequately covered by insurance or by established reserves, and, if not so covered, are without merit or are of such kind, or involve such amounts, as would not have a material adverse effect on the financial position, results of operations or cash flows of the Company.

Insurance liabilities are recorded when it is probable that a liability has been incurred for a particular event and the amount of loss associated with the event can be reasonably estimated. Insurance reserves have been estimated based primarily upon actuarial calculations and reflect the undiscounted estimated liabilities for ultimate losses, including claims incurred but not reported. Inherent in these estimates are assumptions that are based on the Company's history of claims and losses, a detailed analysis of existing claims with respect to potential value, and current legal and legislative trends. If actual claims differ from those projected by management, changes (either increases or decreases) to insurance reserves may be required and would be recorded through income in the period the change was determined. When a recognized liability has been determined to be covered by third-party insurance, the Company records an insurance claim receivable to reflect the covered liability. Insurance claim receivables are included in Other receivables on the Company's Consolidated Balance Sheets. See Note 1, Summary of Significant Accounting Policies for additional information on Accrued insurance and loss reserves.

Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Current Portion of Environmental Liabilities	$ 7,530,000	$ 7,120,000
Total environmental liabilities	33,212,000	34,000,000
Accrued Environmental Loss Contingencies, Noncurrent	$ 25,682,000	$ 26,880,000

Debt and Credit Agreements - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Line of Credit Facility [Line Items]
Long-term Debt	$ 1,416,995	$ 1,348,989
Long-term Debt, Gross	1,428,969	1,364,161
Less: deferred financing costs	11,974	15,172
Current maturities of long-term debt	15,558	11,994
Long-term debt	1,401,437	1,336,995
Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term Debt	$ 422,000	$ 370,000
Debt, Weighted Average Interest Rate	8.12%	7.19%
New Term Loan
Line of Credit Facility [Line Items]
Long-term Debt	$ 487,500	$ 492,500
Debt, Weighted Average Interest Rate	7.72%	6.69%
Senior Notes \| Revolving Credit Facility
Line of Credit Facility [Line Items]
Current maturities of long-term debt	$ 5,000
Notes Payable, Other Payables
Line of Credit Facility [Line Items]
Long-term Debt	$ 44,469	$ 26,661
Debt, Weighted Average Interest Rate	6.11%	5.00%
5.75% notes due May 15,2018 \| Senior Notes
Line of Credit Facility [Line Items]
Long-term Debt	$ 475,000	$ 475,000
Debt Instrument, Interest Rate, Stated Percentage	5.75%

Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating Lease, Payments	$ 37,880	$ 34,420	$ 33,645
Finance Lease, Interest Payment on Liability	1,914	798	517
Finance Lease, Principal Payments	7,736	3,975	2,330
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	27,951	32,817	42,442
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 27,128	$ 11,175	$ 11,495

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2023

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign

Income (loss) from continuing operations before income taxes and equity income as reported on the Consolidated Statements of Operations consists of the following:


(In thousands)	2023		2022		2021
U.S.	$	(28,658)	$	(152,602)	$	(34,462)
International	10,108		29,644		71,968
Total income (loss) from continuing operations before income taxes and equity income	$	(18,550)	$	(122,958)	$	37,506

Schedule of Components of Income Tax Expense (Benefit)

Income tax expense (benefit) as reported on the Consolidated Statements of Operations consists of the following:


(In thousands)	2023		2022		2021
Income tax expense (benefit):
Currently payable:

U.S. state	$	3,463	$	1,416	$	507
International	21,096		14,914		22,295
Total income taxes currently payable	24,559		16,330		22,802
Deferred U.S. federal	2,446		(6,219)		(4,594)
Deferred U.S. state	(1,163)		(2,274)		(18)
Deferred international	2,343		2,544		(9,101)
Total income tax expense (benefit) from continuing operations	$	28,185	$	10,381	$	9,089

Schedule of Effective Income Tax Rate Reconciliation


(In thousands)	2023		2022		2021
U.S. federal income tax expense (benefit), at statutory tax rate of 21%	$	(3,896)	$	(25,821)	$	7,877
U.S. state income taxes, net of federal income tax benefit	1,044		(929)		(310)
U.S. other domestic deductions and credits	(761)		(594)		(415)
Difference in effective tax rates on international earnings and remittances	13,311		5,779		4,488
Uncertain tax position contingencies and settlements	(768)		(290)		783
Changes in realization of deferred tax assets	14,498		8,263		(5,035)
U.S. non-deductible expenses	1,146		791		936
Nondeductible goodwill impairment	—		19,548		—
PP&E / Intangible asset impairment	2,961		3,150		—
State deferred tax rate changes	304		154		592
Foreign derived intangible income deduction	(785)		(938)		—
Share-based compensation	1,131		1,268		173

Total income tax expense (benefit) from continuing operations	$	28,185	$	10,381	$	9,089

Schedule of Deferred Tax Assets and Liabilities

The income tax effects of the temporary differences giving rise to the Company's deferred tax assets and liabilities at December 31, 2023 and 2022 are as follows:


	2023 (a)				2022 (a)
(In thousands)	Asset		Liability		Asset		Liability
Depreciation and amortization	$	—	$	55,004	$	—	$	61,145
Right-of-use assets	—		23,887		—		24,826
Operating lease liabilities	24,222		—		25,024		—
Expense accruals	33,790		—		28,758		—
Inventories	3,704		—		4,011		—
Provision for receivables	3,801		—		2,781		—
Deferred revenue	6,377		—		4,484		—
Operating loss carryforwards	54,935		—		54,237		—
Tax credit carryforwards	15,298		—		21,443		—

Pensions	—		580		5,171		—
Currency adjustments	—		754		—		3,330

Section 163(j) disallowed interest expense	25,937		—		13,869		—
Research and development	6,014		—		2,795		—
Stock based compensation	7,387		—		6,580		—
Other	—		1,823		—		3,198
Subtotal	181,465		82,048		169,153		92,499
Valuation allowance	(112,905)		—		(89,234)		—
Total deferred income taxes	$	68,560	$	82,048	$	79,919	$	92,499

Summary of Income Tax Contingencies

A reconciliation of the change in the unrecognized income tax benefits balance from January 1, 2021 to December 31, 2023 is as follows:


(In thousands)	Unrecognized Income Tax Benefits		Deferred Income Tax Benefits		Unrecognized Income Tax Benefits, Net of Deferred Income Tax Benefits
Balances, January 1, 2021	$	2,896	$	(22)	$	2,874
Additions for tax positions related to the current year (includes currency translation adjustment)	316		(1)		315
Additions for tax positions related to prior years (includes currency translation adjustment)	500		—		500

Statutes of limitation expirations	(585)		1		(584)

Balance at December 31, 2021	3,127		(22)		3,105
Additions for tax positions related to the current year (includes currency translation adjustment)	189		(1)		188


Statutes of limitation expirations	(524)		2		(522)

Balance at December 31, 2022	2,792		(21)		2,771

Additions for tax positions related to the current year (includes currency translation adjustment)	439		(1)		438


Statutes of limitation expirations	(1,106)		5		(1,101)

Total unrecognized income tax benefits that, if recognized, would impact the effective income tax rate at December 31, 2023	$	2,125	$	(17)	$	2,108

Tax Years Subjected to Examniation

The tax years that remain subject to examination for the Company's major tax jurisdictions as of December 31, 2023 are shown below:


Jurisdiction						Earliest Open Year
Brazil						2019
China						2018
France						2021
United States:
Federal income tax						2020
State income tax						2017

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Statement of Stockholders' Equity [Abstract]
Deferred income taxes	$ 605	$ (10,622)	$ (6,241)
Stock appreciation rights exercised (in shares)		16,671	28,789
Vesting of restricted stock units (in shares)	345,195	257,423	193,260
Vesting of performance shares (in shares)			69,127

- Definition

Amount of tax expense (benefit) allocated to other comprehensive income (loss).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482790/220-10-45-12

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482765/220-10-50-4

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481674/830-30-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481694/830-30-45-17

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 830
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 20
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481694/830-30-45-20

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(19))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482685/740-10-50-10

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482659/740-20-45-11

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(21))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04(23))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482659/740-20-45-2

+ Details

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accounting Policies [Abstract]
Income (loss) from discontinued businesses	$ 5,100
Restricted cash	3,375	$ 3,762
Revenue Recognition, Costs-to-Cost Method, Revenue Recognized	$ 70,900

Summary of Significant Accounting Policies (Policies)	12 Months Ended
Summary of Significant Accounting Policies (Policies)	Dec. 31, 2023
Accounting Policies [Abstract]
Consolidation	Consolidation The consolidated financial statements include all accounts of Enviri Corporation (the "Company"), all entities in which the Company has a controlling voting interest and variable interest entities required to be consolidated in accordance with U.S. GAAP. Intercompany accounts and transactions have been eliminated among consolidated entities.
Reclassifications	Out-of-Period Adjustments During 2023, the Company recorded out-of-period adjustments that had the net effect of increasing loss from discontinued businesses on the Company’s Consolidated Statements of Operations by $5.1 million. The adjustments are primarily the result of identified errors relating to value added taxes and inventory. The Company assessed the individual and aggregate impact of these adjustments on the current year and all prior periods and determined that the cumulative effect of the adjustments was not material to the full-year 2023 results, and did not result in a material misstatement to any previously issued annual or quarterly financial statements. Consequently, the Company recorded the adjustment during 2023 and has not revised any previously issued amounts in the Company’s Consolidated Financial Statements.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include cash on hand, demand deposits and short-term investments that are highly liquid in nature and have an original maturity of three months or less.
Restricted Cash	Restricted Cash The Company had restricted cash of $3.4 million and $3.8 million at December 31, 2023 and 2022, respectively, and the restrictions are primarily related to collateral provided for certain guarantees of the Company’s performance.
Accounts Receivable	Accounts Receivable Accounts receivable are stated at net realizable value, which represents the face value of the receivable, less an allowance for expected credit losses. The allowance for expected credit losses is maintained for expected lifetime losses resulting from the inability of customers to make required payments. The Company’s expected credit loss allowance methodology for accounts receivable is developed using historical collection experience, current and future economic and market conditions and a review of the current status of customers' trade accounts receivables. When required, the Company adjusts the loss-rate methodology to account for current conditions and reasonable and supportable expectations of future economic and market conditions. The Company generally assesses future economic conditions for a period which corresponds with the contractual life of its accounts receivable. Additionally, specific allowance amounts are established to record the appropriate provision for customers that have a higher probability of default.
Inventories	Inventories Inventories are accounted for using the average cost, first-in, first-out ("FIFO") or last-in, first-out ("LIFO") method. Inventory accounted for under the average cost and FIFO methods are stated at the lower of cost or net realizable value. Inventory accounted for under the LIFO method is stated at the lower of cost or market. See Note 5, Inventories for additional information.
Depreciation	Property, Plant and Equipment Property, plant and equipment ("PP&E") is recorded at cost and depreciated over the estimated useful lives of the assets using, principally, the straight-line method. When PP&E is retired from service, the cost of the retirement is charged to the allowance for depreciation to the extent of the accumulated depreciation and the balance is charged to income. Long-lived assets to be disposed of by sale are not depreciated while they are classified as held-for-sale.
Leases	Leases The Company leases certain property and equipment under noncancelable lease agreements. The Company determines if a contract or arrangement contains a lease at inception. All leases are evaluated and classified as either an operating or finance lease. A lease is classified as a finance lease if any of the following criteria are met: (i) ownership of the underlying asset transfers to the Company by the end of the lease term; (ii) the lease contains an option to purchase the underlying asset that the Company is reasonably expected to exercise; (iii) the lease term is for a major part of the remaining economic life of the underlying asset; (iv) the present value of the sum of lease payments and any residual value guaranteed by the Company equals or exceeds substantially all of the fair value of the underlying asset; or (v) the underlying asset is of a specialized nature that it is expected to have no alternative use to the lessor at the end of the lease term. A lease that does not meet any of the finance lease classification criteria is classified as an operating lease. Operating leases are included as Right-of-use assets, net, Current portion of operating lease liabilities, and Operating lease liabilities on the Consolidated Balance Sheets. ROU assets and operating lease liabilities are recognized based on the present value of the future lease payments over the lease term at the commencement date. As most of the Company’s leases do not provide an implicit rate for use in determining the present value of future payments, the Company uses an incremental borrowing rate. This incremental borrowing rate reflects the creditworthiness of the Company for a lending period commensurate to the term of the lease, the standard lending practices related to such loans in the respective jurisdiction where the underlying assets are located and the local currency in which the lease is denominated. ROU assets also include any lease payments made prior to or at the lease commencement date and initial direct costs incurred, and may be reduced by any lease incentives received by the lessor. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for minimum lease payments is recognized on a straight-line basis over the lease term, including rent abatement periods and rent holidays. Certain of the Company's leases are subject to annual changes in an index or are subject to adjustments for which the amounts are not readily determinable at lease inception. While lease liabilities are not remeasured as a result of changes to these costs, changes are treated as variable lease payments and recognized in the period in which the obligation for those payments were incurred. Finance leases are included as PP&E, net; Current maturities of long-term debt and Long-term debt on the Consolidated Balance Sheets. Finance lease costs are split between depreciation expense related to the asset and interest expense on the lease liability, using the effective rate charged by the lessor. The Company has lease agreements with both lease and non-lease components, which the Company has elected to account for as a single lease component. Additionally, the Company has elected not to record short-term leases, those with expected terms of twelve months or less, on the Company's Consolidated Balance Sheets. See Note 8, Debt and Credit Agreements and Note 9, Leases for additional information on leases.
Goodwill and Other Intangible Assets	Goodwill In accordance with U.S. GAAP, goodwill is not amortized and is tested for impairment at least annually or more frequently if indicators of impairment exist or if a decision is made to dispose of a business. Goodwill is allocated among and evaluated for impairment at the reporting unit level, which is defined as an operating segment or one level below an operating segment for which discrete financial information is available. A significant amount of judgment is involved in determining if an indicator of impairment has occurred. Such indicators may include declining cash flows or operating losses at the reporting unit level, a significant adverse change in legal factors or in the business climate, an adverse action or assessment by a regulator, unanticipated competition, a loss of key personnel or a more likely than not expectation that a reporting unit or a significant portion of a reporting unit will be sold or otherwise disposed of, among others. In applying the goodwill impairment test, the Company has the option to perform a qualitative test, a quantitative test or both. Under the qualitative test, the Company assesses qualitative factors to determine whether it is more likely than not that the fair value of the reporting units is less than its carrying value. Qualitative factors may include, but are not limited to, economic conditions, industry and market considerations, cost factors, overall financial performance of the reporting unit and other entity and reporting unit specific events. If after assessing these qualitative factors, the Company determines it is “more-likely-than-not” that the fair value of the reporting unit is less than the carrying value, the Company would perform a quantitative test. The quantitative approach of testing for goodwill impairment involves comparing the current fair value of each reporting unit to the carrying value, including goodwill. The Company uses a discounted cash flow model (“DCF model”) to estimate the current fair value of reporting units, as the Company's management believes forecasted operating cash flows are the best indicator of current fair value. A number of significant assumptions and estimates are involved in the preparation of DCF models including future revenues and operating margin growth, the weighted-average cost of capital (“WACC”), tax rates, capital spending, pension funding, the impact of business initiatives and working capital projections. These assumptions and estimates may vary significantly among reporting units. DCF models are based on approved long-range plans for the early years and historical relationships and projections for later years. WACC rates are derived from internal and external factors including, but not limited to, the average market price of the Company's stock, shares outstanding, book value of the Company's debt, the long-term risk-free interest rate, and both market and size-specific risk premiums. Due to the many variables noted above and the relative size of the Company's goodwill, differences in assumptions may have a material impact on the results of the Company's annual goodwill impairment testing. If the net book value of a reporting unit were to exceed the Company's determination of the current fair value, then an impairment charge would be recognized as the difference between the fair value and the carrying value. See Note 7, Goodwill and Other Intangible Assets for additional information.
Impairment of Long-Lived Assets (Other than Goodwill)	Long-Lived Assets Impairments (Other than Goodwill) Long-lived assets or asset groups are reviewed for impairment when events and circumstances indicate that the carrying amount of an asset or asset group may not be recoverable. Long-lived assets or asset groups are reviewed for impairment when events and circumstances indicate the book value of an asset or asset group may be impaired. The Company's policy is to determine if an impairment loss exists when it is determined that the carrying amount of the asset or asset group exceeds the sum of the expected undiscounted future cash flows resulting from use of the asset or asset group and its eventual disposition. Impairment losses are measured as the amount by which the carrying amount of the asset or asset group exceeds its fair value, normally as determined in either open market transactions or through the use of a DCF model. Long-lived assets or asset groups to be disposed of are reported at the lower of the carrying amount or fair value less cost to sell.
Deferred Financing Costs	Deferred Financing Costs The Company has incurred debt issuance costs, which are recognized as a reduction of Long-term debt on the Consolidated Balance Sheets. Debt issuance costs are amortized and recognized over the contractual term of the related indebtedness or shorter period, if appropriate, based upon contractual terms in Interest expense on the Consolidated Statements of Operations. Whenever indebtedness is modified from its original terms, an evaluation is made whether an accounting modification or extinguishment has occurred in order to determine the accounting treatment for debt issuance costs related to the debt modification. If the evaluation results in a gain (loss) on extinguishment of debt, the amount would be included in Facility fees and debt-related income (expense) on the Consolidated Statements of Operations. If the evaluation results in a modification of debt, unamortized costs would be amortized over the new contractual term.
Revenue Recognition	Revenue Recognition The Company recognizes revenues to depict the transfer of promised services and products to customers in an amount that reflects the consideration the Company expects to receive in exchange for those services or products. Revenues from continuing operations include service revenues from the Company's HE and CE Segments and product revenues from the Company's HE Segment. Revenue from the Rail business is included in Income (loss) from discontinued businesses. Harsco Environmental - This Segment provides on-site services, under long-term contracts which may contain multiple performance obligations, for material logistics; product quality improvement and resource recovery from iron, steel and metals manufacturing; manufactures and sells industrial abrasives and roofing granule products; and manufactures aluminum dross and scrap processing systems. •Service revenues are recognized over time as the customer simultaneously receives the benefits provided by the Company's performance. The Company utilizes an output method based on work performed (liquid steel tons processed, weight of material handled, etc.) to measure progress, which is deemed to best depict the transfer of value to the customer and revenue earned by the Company. Transaction prices are based on contractual terms, which may include both fixed and variable portions. The fixed portion is recognized as earned (normally monthly) over the contractual period. The variable portion is recognized as services are performed and differs based on the volume of services performed. Given the long-term nature of these arrangements, most contracts permit periodic adjustment of either the variable or both the fixed and variable portions based on the changes in macroeconomic indicators, including changes in commodity prices. Transaction prices, when the standalone selling price is not directly observable, are allocated to performance obligations utilizing an expected cost plus a margin approach. Amounts are typically billed and payable on a monthly basis as services are performed. •Product revenues are recognized at the point when control transfers to the customer. Control generally transfers at the point of shipment for domestic orders and in accordance with the international commercial terms included in contracts for export sales. Transaction prices are based on contractual terms, which are generally fixed and when the standalone selling price is not directly observable, allocated to performance obligations utilizing an adjusted market assessment approach. Amounts are billed and payable upon completion of each transaction. •Product revenues in the aluminum dross and scrap process systems business are generally recognized over time as control is transferred to the customer. Control transfers over time because aluminum dross and scrap systems are customized, have no alternate use and the Company has an enforceable right to payment. The Company utilizes an input method based on costs incurred ("cost-to-cost method") to measure progress, which is deemed to best depict the transfer of value to the customer and revenue earned by the Company. Transaction prices are based on contractual terms, which are generally fixed, and when the standalone selling price is not directly observable, allocated to performance obligations utilizing an adjusted market assessment approach. The Company may receive periodic payments associated with key milestones with any remaining consideration billed and payable upon completion of the transaction. Clean Earth - This Segment provides specialty waste processing and beneficial reuse solutions for hazardous wastes, and soil and dredged materials. •Revenues are recognized over time as the customer simultaneously receives the benefits provided by the Company's performance. The Company utilizes an output method based on the amount of materials received for processing to measure progress, which is deemed to best depict the transfer of value to the customer and revenue earned by the Company. Transaction prices are based on contractual terms, which are principally variable based on volume and recognized as services are performed. Amounts are typically billed and payable on a monthly basis. Harsco Rail - This business sells railway track maintenance equipment, after-market parts, Protran/safety equipment and provides railway track maintenance services. Certain contracts may contain multiple performance obligations, such as a sale of equipment with services and spare parts. •For standard railway track maintenance equipment sales, revenue is recognized at the point when control transfers to the customer. Control generally transfers at the point of shipment for domestic orders and in accordance with the international commercial terms included in contracts for export sales. In certain railway track maintenance equipment sales, revenue is recognized over time because such equipment is highly customized, has no alternate use and the Company has an enforceable right to payment. Rail uses the cost-to-cost method to measure progress because it is the measure that best depicts the transfer of control to the customer, which occurs as costs are incurred under the contracts. Under the cost-to-cost method, the extent of progress towards completion is based on the ratio of costs incurred to total estimated costs at completion, which includes both actual costs already incurred and the estimated costs to complete. Accounting for contracts with customers using the cost-to-cost method requires significant judgment relative to assessing risks; estimating contract revenues (including estimates of variable consideration, if applicable, as well as estimating any liquidating damages or penalties related to performance); estimating contract costs (including estimating engineering costs to design the machine and the material, labor and overhead manufacturing costs to build the machine); making assumptions for schedule and technical items; properly executing the engineering and design phases consistent with customer expectations; the availability and costs of labor and material resources; productivity; and evaluating whether a significant financing component is present. Due to the number of years it may take to complete certain contracts and the scope and nature of the work required to be performed on those contracts, estimating total revenues and costs at completion is inherently complicated and subject to many variables. Transaction prices are based on contracted terms, which are generally fixed, and when the standalone selling price is not directly observable, allocated to performance obligations utilizing either the adjusted market assessment or expected cost plus a margin approach. For certain transactions, the Company receives periodic payments associated with key milestones. In limited instances, those payments are intended to provide financing, with such transactions being treated as including a significant financing component. Any remaining consideration is billed and payable upon completion of the transaction. Railway track maintenance equipment revenue of approximately $70.9 million was recognized using the cost-to-cost method in 2023, the net profit or loss of which is included in Income (loss) from discontinued businesses in the Company's Consolidated Statements of Operations. •For after-market parts sales and Protran/safety equipment, revenue is recognized at the point when control transfers to the customer. Control generally transfers to the customer at the point of shipment for domestic orders and in accordance with the international commercial terms included in contracts for export sales. Transaction prices are based on contracted terms, which are generally fixed, and when the standalone selling price is not directly observable, allocated to performance obligations utilizing an adjusted market assessment approach. Amounts are billed and payable upon completion of each contract. •For railway track maintenance services, revenue is recognized over time as the customer simultaneously receives the benefits provided by the Company's performance. The Company utilizes an appropriate output method based on work performed (feet, miles, shifts worked, etc.) to measure progress, which is deemed to best depict the transfer of value to the customer and revenue earned by the Company. Transaction prices are based on contracted terms, which are generally variable. The variable portion is recognized as services are performed and differs based on the value of services. Given the long-term nature of these arrangements, most contracts permit periodic adjustment based on the changes in macroeconomic indicators. Transaction prices, when the standalone selling price is not directly observable, are allocated to performance obligations utilizing an expected cost plus a margin approach. Amounts are typically billed and payable on a monthly basis as services are performed. The Company has elected to utilize the following practical expedients on an ongoing basis: •The Company has not adjusted the promised amount of consideration for the effects of a significant financing component if the Company expects, at contract inception, that the period between when the Company transfers the promised good or services to the customer and when the customer pays for that good or service would be one year or less; and •The Company has elected to exclude disclosures related to unsatisfied performance obligations where the related contract has a duration of one year or less; or where the consideration is entirely variable. Accordingly, the Company's disclosure related to unsatisfied performance obligations is limited to the fixed portion of fees related to metals services in HE. Taxes assessed by governmental authorities that are both imposed on and concurrent with a specific revenue-producing transaction, that are collected by the Company from a customer, are excluded from revenue. Additionally, in certain contracts, the Company facilitates shipping and handling activities after control has transferred to the customer. The Company has elected to record all shipping and handling activities as costs to fulfill a contract. In situations where the shipping and handling costs have not been incurred at the time revenue is recognized, the respective shipping and handling costs are accrued.
Income Taxes	Income Taxes The Company accounts for income taxes under the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of the events that have been included in the consolidated financial statements. Under this method, deferred tax assets and liabilities are determined based on the differences between the consolidated financial statements and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date. The Company records deferred tax assets to the extent that the Company believes that these assets will more likely than not be realized. In making such determinations, the Company considers all available positive and negative evidence, including future reversals of existing deferred tax liabilities, projected future taxable income, tax planning strategies and recent financial results. If the Company determines that it will not be able to realize deferred income tax assets in the future, a valuation allowance is recorded. If sufficient positive evidence arises in the future indicating that all or a portion of the deferred tax assets meet the more likely than not standard for realization, the valuation allowance would be reduced accordingly in the period that such a conclusion is reached. The Company prepares and files tax returns based on interpretation of tax laws and regulations and records its provision for income taxes based on these interpretations. Uncertainties may exist in estimating the Company's tax provisions and in filing tax returns in the many jurisdictions in which the Company operates, and as a result these interpretations may give rise to an uncertain tax position. The tax benefit from an uncertain tax position is recognized when it is more likely than not that the position will be sustained upon examination, including resolutions of any related appeals or litigation processes, based on its technical merits. Each subsequent period, the Company determines if existing or new uncertain tax positions meet a more likely than not recognition threshold and adjusts accordingly. The Company recognizes interest and penalties related to unrecognized tax benefits within Income tax expense in the accompanying Consolidated Statements of Operations. Liabilities for uncertain tax positions are included in Other liabilities on the Consolidated Balance Sheets. The significant assumptions and estimates described in the preceding paragraphs are important contributors to the effective tax rate each year.
Accrued Insurance and Loss Reserves	Accrued Insurance and Loss Reserves The Company retains a significant portion of the risk for certain U.S. workers' compensation, U.K. employers' liability, automobile, general and product liability losses. Insurance reserves have been recorded that reflect the undiscounted estimated liabilities including claims incurred but not reported. When a recognized liability is covered by third-party insurance, the Company records an insurance claim receivable to reflect the covered liability. Changes in the estimates of the reserves are included in net income (loss) in the period determined. During 2023, the Company recorded insurance reserve adjustments that increased pre-tax insurance expense from continuing operations for self-insured programs by $0.7 million, During 2022 and 2021, the Company recorded insurance reserve adjustments that decreased pre-tax insurance expense from continuing operations for self-insured programs by $1.0 million and $0.2 million, respectively. At December 31, 2023 and 2022, the Company has recorded liabilities of $31.5 million and $32.4 million, respectively, related to both asserted as well as unasserted insurance claims. Included in the balances at December 31, 2023 and 2022 were $6.5 million and $4.0 million, respectively, of recognized liabilities covered by insurance carriers. Amounts estimated to be paid within one year have been included in Other current liabilities, with the remainder included in Other liabilities, on the Company's Consolidated Balance Sheets.
Foreign Currency Translation	Foreign Currency Translation The financial statements of the Company's subsidiaries outside the U.S., except for Turkey and Argentina which are located in highly inflationary economies and those entities for which the U.S. dollar is the functional currency, are measured using the local currency as the functional currency. Assets and liabilities of these subsidiaries are translated at the exchange rates at the balance sheet date. Resulting translation adjustments are recorded in the cumulative translation adjustment account, a separate component of AOCI, on the Consolidated Balance Sheets. Income and expense items are translated at average monthly exchange rates. Gains and losses from foreign currency transactions are included in Operating income from continuing operations. For subsidiaries operating in highly inflationary economies, and those entities for which the U.S. dollar is the currency of the primary economic environment in which the entity operates, gains and losses on foreign currency transactions and balance sheet translation adjustments are included in Operating income from continuing operations.
Financial Instruments and Hedging	Financial Instruments and Hedging The Company has operations throughout the world that are exposed to fluctuations in related foreign currencies in the normal course of business. The Company seeks to reduce exposure to foreign currency fluctuations through the use of forward exchange contracts. The Company does not hold or issue financial instruments for trading purposes, and it is the Company's policy to prohibit the use of derivatives for speculative purposes. The Company has a Foreign Currency Risk Management Committee that meets periodically to monitor foreign currency risks. The Company executes foreign currency exchange forward contracts to hedge transactions for firm purchase commitments, to hedge variable cash flows of forecasted transactions and for export sales denominated in foreign currencies. These contracts are generally for 90 days or less; however, where appropriate, longer-term contracts may be utilized. For those contracts that are designated as qualified cash flow hedges, gains or losses are recorded in AOCI on the Consolidated Balance Sheets. The Company uses interest rate swaps in conjunction with certain debt issuances in order to secure a fixed interest rate. The interest rate swaps are recorded on the Consolidated Balance Sheets at fair value, with changes in value attributed to the effect of the swaps’ interest spread and changes in the credit worthiness of the counter-parties recorded in AOCI. Amounts recorded in AOCI on the Consolidated Balance Sheets are reclassified into income in the same period or periods during which the hedged forecasted transaction affects income. The cash flows from these contracts are classified consistent with the cash flows from the transaction being hedged (e.g., the cash flows related to contracts to hedge the purchase of fixed assets are included in cash flows from investing activities, etc.). The Company also enters into certain forward exchange contracts that are not designated as hedges. Gains and losses on these contracts are recognized in the Consolidated Statements of Operations based on changes in fair market value. For fair value hedges of a firm commitment, the gain or loss on the derivative and the offsetting gain or loss on the hedged firm commitment are recognized concurrently in the Consolidated Statements of Operations.
Earnings Per Share	Earnings Per Share Basic earnings per share are calculated using the weighted-average shares of common stock outstanding, while diluted earnings per share reflect the dilutive effects of stock-based compensation. Dilutive securities are not included in the computation of loss per share when the Company reports a net loss from continuing operations, as the impact would be anti-dilutive. All share and per share amounts are restated for any stock splits and stock dividends that occur prior to the issuance of the financial statements.
Use of Estimates in the Preparation of Financial Statements	Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses. Actual results could differ from those estimates.
Recently Adopted and Recently Issued Accounting Standards	Recently Adopted and Recently Issued Accounting Standards The following accounting standards were adopted in 2023: On January 1, 2023, the Company adopted changes issued by the FASB that clarify that an acquirer of a business should recognize and measure contract assets and contract liabilities in a business combination in accordance with accounting standards governing revenue from contracts with customers. The adoption of these changes did not have an immediate impact on the Company's consolidated financial statements, but will be applied prospectively to future business combinations. On January 1, 2023, the Company adopted changes issued by the FASB that require a buyer in a supplier finance program, also referred to as reverse factoring, payables finance, or structured payables arrangements, to disclose sufficient information about the program to allow a user of financial statements to understand the program’s nature, activity during the period, changes from period to period, and potential magnitude, by disclosing qualitative and quantitative information about the program. The adoption of these changes did not have a material impact on the Company's consolidated financial statements, including the notes thereto. The following accounting standards have been issued and become effective for the Company at a future date: In November 2023, the FASB issued changes that require expansion of annual and interim disclosure requirements for reportable segments, primarily through enhanced disclosures about significant segment expenses. The changes become effective starting with the Company's annual financial statements for the year ended December 31, 2024. The Company is currently evaluating the impact that this change will have on the Company's disclosures. In December 2023, the FASB issued changes which require greater disaggregation of income tax disclosures related to the income tax rate reconciliation and income taxes paid. The changes become effective starting with the Company's annual financial statements for the year ended December 31, 2025. The guidance should be applied on a prospective basis with the option to apply the standard retrospectively. Early adoption is permitted. The Company is currently evaluating the impact that this change will have on the Company's disclosures.

Accounts Receivable and Note Receivable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2023	Jun. 30, 2023	Jan. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 296,291,000	$ 272,775,000
Accounts Receivable Greater than 12 Months Reserved	11,300,000
Accounts Receivable Securitization, Deferred Financing Cost		1,800,000
Receivable with Imputed Interest, Face Amount					$ 40,000,000
Note Receivable; Interest Rate; Stated percentage					2.50%
Receivables, Fair Value Disclosure					$ 34,300,000
Proceeds from Collection of Notes Receivable	11,200,000	8,600,000
Receivable with Imputed Interest, Net Amount	$ 14,000,000.0	23,900,000
Middle East \| Harsco Environmental
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable Greater than 12 Months Reserved			$ 5,300,000
P N C Member
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable Securitization, Term	3 years
Accounts Receivable Securitization, Maximum Purchase Commitment				$ 150,000,000.0
Accounts Receivable from Securitization	$ 82,200,000	$ 69,700,000
Greater than 12 months
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 18,000,000
Harsco Industrial IKG \| Disposal Group, Disposed of by Sale, Not Discontinued Operations
Accounts, Notes, Loans and Financing Receivable [Line Items]
Disposal Group, Including Discontinued Operation, Consideration					$ 85,000,000

SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Accrued Environmental Loss Contingencies, Noncurrent	$ 25,682	$ 26,880
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	8,347	11,654	$ 7,488
Charged to Cost and Expenses	7,039	403	589
Due to Currency Translation Adjustments	(37)	(110)	(206)
Other	170	(3,600)	3,783
Balance at End of Period	15,519	8,347	11,654
Deferred Tax Assets - Valuation Allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	89,234	92,385	108,563
Charged to Cost and Expenses	26,031	14,126	(4,252)
Due to Currency Translation Adjustments	2,268	(6,448)	(3,502)
Other	(4,628)	(10,829)	(8,424)
Balance at End of Period	112,905	$ 89,234	$ 92,385
Pension Adjustments
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Decrease in valuation allowance	(19,300)
Tax Rate Change
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Decrease in valuation allowance	$ (14,400)

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income from continuing operations before income taxes and equity income
U.S.	$ (28,658)	$ (152,602)	$ (34,462)
International	10,108	29,644	71,968
Income (loss) from continuing operations before income taxes and equity income	(18,550)	(122,958)	37,506
Currently payable:
U.S. state	3,463	1,416	507
International	21,096	14,914	22,295
Total income taxes currently payable	24,559	16,330	22,802
Deferred U.S. federal	2,446	(6,219)	(4,594)
Deferred U.S. state	(1,163)	(2,274)	(18)
Deferred international	2,343	2,544	(9,101)
Total income tax expense from continuing operations	28,185	10,381	9,089
Cash payments for income taxes, including taxes on gain or loss from discontinued business	$ 20,100	$ 20,900	$ 21,700

Leases

12 Months Ended

Dec. 31, 2023

Leases [Abstract]

Leases

The components of lease expense were as follows:


(In thousands)	2023		2022		2021
Finance leases:
Depreciation expense	$	7,957	$	3,938	$	2,510
Interest on lease liabilities	2,036		784		495
Operating leases	34,735		33,773		32,544
Variable and short-term leases	52,200		49,811		47,780
Sublease income	(7)		(6)		(53)
Total lease expense from continuing operations	$	96,921	$	88,300	$	83,276

Supplemental cash flow information related to leases was as follows:


(In thousands)	2023		2022		2021
Cash paid for amounts included in the measurement of lease liabilities:
Cash flows used by operating activities - Operating leases (a)	$	37,880	$	34,420	$	33,645
Cash flows used by operating activities - Finance leases	1,914		798		517
Cash flows used by financing activities - Finance leases	7,736		3,975		2,330
ROU assets obtained in exchange for lease obligations:
Operating leases	$	27,951	$	32,817	$	42,442
Finance leases	27,128		11,175		11,495

(a) Cash flows include cash paid for operating leases of discontinued operations.

Supplemental balance sheet information related to leases was as follows:


(In thousands)	2023		2022
Operating Leases:
Operating lease ROU assets	$	95,841	$	101,253
Current portion of operating lease liabilities	25,119		25,521
Operating lease liabilities	72,145		75,246
Finance Leases:
Property, plant and equipment, net	$	43,151	$	23,671
Current maturities of long-term debt	9,723		5,562
Long-term debt	33,911		18,832

Supplemental additional information related to leases was as follows:


	2023		2022
Other information:
Weighted average remaining lease term - Operating leases (in years)	7.36		7.42
Weighted average remaining lease term - Finance leases (in years)	5.33		5.35
Weighted average incremental borrowing rate - Operating leases	6.3	%	6.0	%
Weighted average incremental borrowing rate - Finance leases	6.4	%	5.2	%

Maturities of lease liabilities were as follows:


(In thousands)	Operating Leases		Finance Leases
Year Ending December 31:
2024	$	30,134	$	12,154
2025	23,486		10,531
2026	17,774		9,197
2027	11,740		7,426
2028	7,209		5,542
After 2028	34,524		6,869
Total lease payments	124,867		51,719
Less: Imputed interest	(27,603)		(8,085)
Total lease liabilities	$	97,264	$	43,634

The Company's leases, excluding short-term leases, have remaining terms of less than one year to approximately 27 years, some of which contain options to extend or terminate the lease terms, based on the provisions in the lease agreements. As of December 31, 2023, the Company has approximately $49 million of finance lease obligations to be recognized for equipment in CE with expected commencement dates in 2024 and 2025. There are no material residual value guarantees or material restrictive covenants in any of the Company's leases.

Leases

The components of lease expense were as follows:


(In thousands)	2023		2022		2021
Finance leases:
Depreciation expense	$	7,957	$	3,938	$	2,510
Interest on lease liabilities	2,036		784		495
Operating leases	34,735		33,773		32,544
Variable and short-term leases	52,200		49,811		47,780
Sublease income	(7)		(6)		(53)
Total lease expense from continuing operations	$	96,921	$	88,300	$	83,276

Supplemental cash flow information related to leases was as follows:


(In thousands)	2023		2022		2021
Cash paid for amounts included in the measurement of lease liabilities:
Cash flows used by operating activities - Operating leases (a)	$	37,880	$	34,420	$	33,645
Cash flows used by operating activities - Finance leases	1,914		798		517
Cash flows used by financing activities - Finance leases	7,736		3,975		2,330
ROU assets obtained in exchange for lease obligations:
Operating leases	$	27,951	$	32,817	$	42,442
Finance leases	27,128		11,175		11,495

(a) Cash flows include cash paid for operating leases of discontinued operations.

Supplemental balance sheet information related to leases was as follows:


(In thousands)	2023		2022
Operating Leases:
Operating lease ROU assets	$	95,841	$	101,253
Current portion of operating lease liabilities	25,119		25,521
Operating lease liabilities	72,145		75,246
Finance Leases:
Property, plant and equipment, net	$	43,151	$	23,671
Current maturities of long-term debt	9,723		5,562
Long-term debt	33,911		18,832

Supplemental additional information related to leases was as follows:


	2023		2022
Other information:
Weighted average remaining lease term - Operating leases (in years)	7.36		7.42
Weighted average remaining lease term - Finance leases (in years)	5.33		5.35
Weighted average incremental borrowing rate - Operating leases	6.3	%	6.0	%
Weighted average incremental borrowing rate - Finance leases	6.4	%	5.2	%

Maturities of lease liabilities were as follows:


(In thousands)	Operating Leases		Finance Leases
Year Ending December 31:
2024	$	30,134	$	12,154
2025	23,486		10,531
2026	17,774		9,197
2027	11,740		7,426
2028	7,209		5,542
After 2028	34,524		6,869
Total lease payments	124,867		51,719
Less: Imputed interest	(27,603)		(8,085)
Total lease liabilities	$	97,264	$	43,634

Leases

The components of lease expense were as follows:


(In thousands)	2023		2022		2021
Finance leases:
Depreciation expense	$	7,957	$	3,938	$	2,510
Interest on lease liabilities	2,036		784		495
Operating leases	34,735		33,773		32,544
Variable and short-term leases	52,200		49,811		47,780
Sublease income	(7)		(6)		(53)
Total lease expense from continuing operations	$	96,921	$	88,300	$	83,276

Supplemental cash flow information related to leases was as follows:


(In thousands)	2023		2022		2021
Cash paid for amounts included in the measurement of lease liabilities:
Cash flows used by operating activities - Operating leases (a)	$	37,880	$	34,420	$	33,645
Cash flows used by operating activities - Finance leases	1,914		798		517
Cash flows used by financing activities - Finance leases	7,736		3,975		2,330
ROU assets obtained in exchange for lease obligations:
Operating leases	$	27,951	$	32,817	$	42,442
Finance leases	27,128		11,175		11,495

(a) Cash flows include cash paid for operating leases of discontinued operations.

Supplemental balance sheet information related to leases was as follows:


(In thousands)	2023		2022
Operating Leases:
Operating lease ROU assets	$	95,841	$	101,253
Current portion of operating lease liabilities	25,119		25,521
Operating lease liabilities	72,145		75,246
Finance Leases:
Property, plant and equipment, net	$	43,151	$	23,671
Current maturities of long-term debt	9,723		5,562
Long-term debt	33,911		18,832

Supplemental additional information related to leases was as follows:


	2023		2022
Other information:
Weighted average remaining lease term - Operating leases (in years)	7.36		7.42
Weighted average remaining lease term - Finance leases (in years)	5.33		5.35
Weighted average incremental borrowing rate - Operating leases	6.3	%	6.0	%
Weighted average incremental borrowing rate - Finance leases	6.4	%	5.2	%

Maturities of lease liabilities were as follows:


(In thousands)	Operating Leases		Finance Leases
Year Ending December 31:
2024	$	30,134	$	12,154
2025	23,486		10,531
2026	17,774		9,197
2027	11,740		7,426
2028	7,209		5,542
After 2028	34,524		6,869
Total lease payments	124,867		51,719
Less: Imputed interest	(27,603)		(8,085)
Total lease liabilities	$	97,264	$	43,634

Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances	$ 623,042	$ 805,770	$ 713,399
OCI before reclassifications	10,299	(30,317)
Amounts reclassified from AOCI, net of tax	17,026	18,710
Other Comprehensive Income (Loss), Net of Tax, Total	27,325	(11,607)	84,105
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	617	4,110
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	27,942	(7,497)
Balances	575,408	623,042	805,770
Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances		(560,139)
Balances			(560,139)
Accumulated Foreign Currency Adjustment Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances	(213,104)
OCI before reclassifications	29,495	(82,325)
Amounts reclassified from AOCI, net of tax	(507)	0
Other Comprehensive Income (Loss), Net of Tax, Total	28,988	(82,325)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	617	4,110
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	29,605	(78,215)
Balances	(183,499)	(213,104)
Accumulated Foreign Currency Adjustment Attributable to Parent \| Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances		(134,889)
Balances			(134,889)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances	157
OCI before reclassifications	64	1,642
Amounts reclassified from AOCI, net of tax	(691)	1,539
Other Comprehensive Income (Loss), Net of Tax, Total	(627)	3,181
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	(627)	3,181
Balances	(470)	157
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent \| Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances		(3,024)
Balances			(3,024)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances	(354,699)
OCI before reclassifications	(19,265)	50,378
Amounts reclassified from AOCI, net of tax	18,224	17,171
Other Comprehensive Income (Loss), Net of Tax, Total	(1,041)	67,549
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	(1,041)	67,549
Balances	(355,740)	(354,699)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent \| Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances		(422,248)
Balances			(422,248)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances	10
OCI before reclassifications	5	(12)
Amounts reclassified from AOCI, net of tax	0	0
Other Comprehensive Income (Loss), Net of Tax, Total	5	(12)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	0	0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	5	(12)
Balances	15	10
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent \| Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances		22
Balances			22
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances	(567,636)	(560,139)	(645,741)
Other Comprehensive Income (Loss), Net of Tax, Total	27,942	(7,497)	85,602
Balances	$ (539,694)	$ (567,636)	$ (560,139)

Insider Trading Arrangements	12 Months Ended
Insider Trading Arrangements	Dec. 31, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false