Enviri (NVRI) 10-K 1 Mar 23 2022 FY Annual report Financial data

Cover

Cover - USD ($)	12 Months Ended
	Dec. 31, 2022	Feb. 28, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Entity File Number	001-03970
Entity Registrant Name	HARSCO CORP
Entity Incorporation, State or Country Code	DE
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	HSC
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
Entity Shell Company	false
Entity Public Float			$ 564,759,344
Entity Common Stock, Shares Outstanding		79,502,316
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0000045876
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Amendment Flag	false
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCE Selected portions of the 2023 Proxy Statement are incorporated by reference into Part III of this Report.

Audit Information

Audit Information	12 Months Ended
	Dec. 31, 2022
Auditor Information [Abstract]
Auditor Name	PricewaterhouseCoopers LLP
Auditor Location	Philadelphia, Pennsylvania
Auditor Firm ID	238

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 81,332	$ 82,908
Restricted cash	3,762	4,220
Trade accounts receivable, net	264,428	377,881
Other receivables	25,379	33,059
Inventories	81,375	70,493
Prepaid Expense	30,583	31,065
Current portion of assets held-for-sale	266,335	265,413
Other current assets	14,541	9,934
Total current assets	767,735	874,973
Property, plant and equipment, net	656,875	653,913
Right-of-use assets, net	101,253	101,576
Goodwill	759,253	883,109
Intangible assets, net	352,160	402,801
Deferred income tax assets	17,489	17,883
Assets held-for-sale	70,105	71,234
Other assets	65,984	48,419
Total assets	2,790,854	3,053,908
Current liabilities:
Short-term borrowings	7,751	7,748
Current maturities of long-term debt	11,994	10,226
Accounts payable	205,577	186,126
Accrued compensation	43,595	48,165
Income taxes payable	3,640	6,378
Operating Lease, Liability, Current	25,521	25,590
Total Rail liabilities included in Liabilities of assets held-for-sale	159,004	161,999
Other current liabilities	140,199	155,159
Total current liabilities	597,281	601,391
Long-term debt	1,336,995	1,359,446
Retirement plan liabilities	46,601	93,693
Operating Lease, Liability, Noncurrent	75,246	74,571
Liabilities of assets held-for-sale	9,463	8,492
Accrued Environmental Loss Contingencies, Noncurrent	26,880	28,435
Deferred tax liabilities	30,069	33,826
Other liabilities	45,277	48,284
Total liabilities	2,167,812	2,248,138
COMMITMENTS AND CONTINGENCIES
HARSCO CORPORATION STOCKHOLDERS' EQUITY
Common stock, par value $1.25 (issued 116,358,520 and 115,906,393 shares at December 31, 2022 and 2021, respectively)	145,448	144,883
Additional paid-in capital	225,759	215,528
Accumulated other comprehensive loss	(567,636)	(560,139)
Retained earnings	1,614,441	1,794,510
Treasury stock, at cost (36,868,880 and 36,690,847 shares at December 31, 2022 and 2021, respectively)	(848,570)	(846,622)
Total Harsco Corporation stockholders' equity	569,442	748,160
Noncontrolling interests	53,600	57,610
Total equity	623,042	805,770
Total liabilities and equity	$ 2,790,854	$ 3,053,908

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Common stock, par value (usd per share)	$ 1.25	$ 1.25
Common stock, shares issued	116,358,520	115,906,393	115,430,042	114,720,347
Treasury stock, shares	36,868,880	36,690,847	36,505,672	36,205,589

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues from continuing operations:
Product revenues	$ 1,889,065	$ 1,848,399	$ 1,534,033
Costs and expenses from continuing operations:
Cost of sales	1,553,335	1,490,556	1,242,291
Selling, general and administrative costs	268,066	272,233	284,442
Research and development expenses	690	956	534
Goodwill and other intangible asset impairment charges	119,580	0	0
Other expenses	4,737	(3,722)	10,072
Total costs and expenses	1,946,408	1,760,023	1,537,339
Operating income (loss) from continuing operations	(57,343)	88,376	(3,306)
Interest income	3,559	2,231	2,129
Interest expense	(75,156)	(63,235)	(58,196)
Defined benefit pension income (expense)	8,938	15,640	7,073
Loss on early extinguishment of debt	(2,956)	(5,506)	(1,920)
Income (loss) from continuing operations before income taxes and equity income	(122,958)	37,506	(54,220)
Income tax expense	(10,381)	(9,089)	8,673
Equity in income (loss) of unconsolidated entities, net	(178)	(302)	186
Income (loss) from continuing operations	(133,517)	28,115	(45,361)
Discontinued operations:
Income (loss) from discontinued businesses	0	0	18,281
Income (loss) from discontinued businesses	(50,301)	(25,863)	20,350
Income tax benefit (expense) from discontinued businesses	7,387	477	(15,245)
Income (loss) from discontinued operations, net of tax	(42,914)	(25,386)	23,386
Net income (loss)	(176,431)	2,729	(21,975)
Less: Net income attributable to noncontrolling interests	(3,638)	(5,978)	(4,366)
Net income (loss) attributable to Harsco Corporation	(180,069)	(3,249)	(26,341)
Amounts attributable to Harsco Corporation common stockholders:
Income (loss) from continuing operations, net of tax	(137,155)	22,137	(49,727)
Income (loss) from discontinued operations, net of tax	(42,914)	(25,386)	23,386
Net income (loss) attributable to Harsco Corporation common stockholders	$ (180,069)	$ (3,249)	$ (26,341)
Weighted average shares of common stock outstanding	79,493	79,234	78,939
Basic earnings (loss) per share attributable to Harsco Corporation common stockholders:
Continuing operations (in dollars per share)	$ (1.73)	$ 0.28	$ (0.63)
Discontinued operations (in dollars per share)	(0.54)	(0.32)	0.30
Basic earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ (2.27)	$ (0.04)	$ (0.33)
Diluted weighted average shares of stock outstanding	79,493	80,289	78,939
Diluted earnings (loss) per share attributable to Harsco Corporation common stockholders:
Continuing operations (in dollars per share)	$ (1.73)	$ 0.28	$ (0.63)
Discontinued operations (in dollars per share)	(0.54)	(0.32)	0.30
Diluted earnings (loss) per share attributable to Harsco Corporation common stockholders (in dollars per share)	$ (2.27)	$ (0.04)	$ (0.33)

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (176,431)	$ 2,729	$ (21,975)
Other comprehensive income (loss):
Foreign currency translation adjustments, net of deferred income taxes of $1,284, 2,507 and $(2,167) in 2020, 2019 and 2018, respectively	(82,325)	(10,994)	20,760
Net gain (loss) on cash flow hedging instruments, net of deferred income taxes of $(1,284), $(797) and $79 in 2022, 2021 and 2020, respectively	3,181	2,816	(2,123)
Pension liability adjustments, net of deferred income taxes of $(2,590), $(5,409) and $384 in 2022, 2021 and 2020, respectively	67,549	92,252	(73,938)
Unrealized gain (loss) on marketable securities, net of deferred income taxes of $4, $(12) and $2 in 2022, 2021 and 2020, respectively	(12)	31	(6)
Other Comprehensive Income (Loss), Net of Tax, Total	(11,607)	84,105	(55,307)
Total comprehensive income (loss)	(188,038)	86,834	(77,282)
Less: Comprehensive (income) loss attributable to noncontrolling interests	472	(4,480)	(7,178)
Comprehensive income (loss) attributable to Harsco Corporation	$ (187,566)	$ 82,354	$ (84,460)

CONSOLIDATED STATEMENTS OF CO_2

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement of Comprehensive Income [Abstract]
Foreign currency translation adjustments, deferred income taxes	$ (6,752)	$ (23)	$ 1,284
Net gains (losses) on cash flow hedging instruments, deferred income taxes	(1,284)	(797)	79
Pension liability adjustments, deferred income taxes	(2,590)	(5,409)	384
Unrealized gain (loss) on marketable securities, deferred income taxes	$ 4	$ (12)	$ 2

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income (loss)	$ (176,431)	$ 2,729	$ (21,975)
Adjustments to reconcile net income (loss) to net cash provided (used) by operating activities:
Depreciation	129,712	131,449	125,765
Amortization	34,137	35,224	33,937
(Gain) loss on early extinguishment of debt	(2,254)	2,668	0
Deferred income tax expense (benefit)	(12,029)	(16,930)	1,115
Equity (income) loss of unconsolidated entities, net	178	302	(186)
Dividends from unconsolidated entities	526	269	216
Gain on sale from discontinued businesses	0	0	(18,281)
Goodwill and other intangible asset impairment charges	119,580	0	0
Other, net	(427)	2,062	310
Changes in assets and liabilities:
Accounts receivable	94,317	(19,781)	34,221
Income tax refunds receivable from acquisition, reimbursable to seller	7,687	2,870	(11,032)
Inventories	(16,798)	(7,783)	(12,281)
Contract assets	11,543	(43,510)	(28,376)
Right-of-use-assets	29,171	28,300	25,400
Accounts payable	19,264	14,118	(14,452)
Accrued interest payable	(643)	(411)	(2,422)
Accrued compensation	(3,945)	6,469	2,921
Advances on contracts and other customer advances	(11,347)	(14,311)	10,492
Operating lease liabilities	(28,374)	(27,307)	(24,785)
Income taxes payable - gain on sale of discontinued businesses	0	0	(12,373)
Retirement plan liabilities, net	(34,136)	(45,786)	(33,257)
Other assets and liabilities	(9,204)	21,556	(1,139)
Net cash provided (used) by operating activities	150,527	72,197	53,818
Cash flows from investing activities:
Purchases of property, plant and equipment	(137,160)	(158,326)	(120,224)
Proceeds from sale of businesses	0	0	37,219
Purchase of businesses, net of cash acquired*	0	0	(432,855)
Proceeds from sales of assets	10,759	16,724	6,204
Expenditures for intangible assets	(184)	(358)	(317)
Proceeds from notes receivable	8,605	6,400	0
Payments for settlement of interest rate swaps	(2,304)	0	0
Net proceeds (payments) from settlement of foreign currency forward exchange contracts	20,950	10,940	(10,519)
Other investing activities, net	273	171	(152)
Net cash used by investing activities	(99,061)	(124,449)	(520,644)
Cash flows from financing activities:
Short-term borrowings, net	884	935	1,612
Current maturities and long-term debt:
Additions	224,445	540,663	638,717
Reductions	(256,310)	(464,848)	(139,887)
Dividends paid to noncontrolling interests	(4,841)	(3,103)	(2,978)
Noncontrolling Interest - purchase or sale	1,901	0	(561)
Stock-based compensation - Employee taxes paid	(1,949)	(3,392)	(4,303)
Payment of contingent consideration	(6,915)	(1,588)	(2,342)
Deferred financing costs	0	(7,828)	(1,928)
Other financing activities, net	0	(601)	(1,372)
Net cash (used) provided by financing activities	(42,785)	60,238	486,958
Effect of exchange rate changes on cash, including restricted cash	(10,715)	(527)	(195)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	(2,034)	7,459	19,937
Cash and cash equivalents, including restricted cash, at beginning of period	87,128	79,669	59,732
Cash and cash equivalents, including restricted cash, at end of period	85,094	87,128	79,669
Supplemental Cash Flow Information [Abstract]
Change in accrual for purchases of property, plant and equipment included in accounts payable	10,845	4,253	3,559
Purchase of businesses, net of cash acquired
Working capital	0	532	(33,387)
Property, plant and equipment	0	823	(102,258)
Goodwill	0	(1,232)	(153,562)
Other noncurrent assets and liabilities, net	0	(123)	(143,648)
Net cash used to acquire businesses	$ 0	$ 0	$ (432,855)

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock Issued	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests
Balances at Dec. 31, 2019	$ 789,659	$ 143,400	$ (838,893)	$ 200,595	$ 1,824,100	$ (587,622)	$ 48,079
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(21,975)				(26,341)		4,366
Cash dividends declared:
Noncontrolling interests	(2,978)						(2,978)
Total other comprehensive income (loss)	(55,307)					(58,119)	2,812
Stock appreciation rights exercised	(24)	11	(24)	(11)
Vesting of restricted stock units and other stock grants	(1,108)	288	(1,108)	(288)
Vesting of performance share units	(3,205)	589	(3,205)	(589)
Amortization of unearned stock-based compensation, net of forfeitures	8,898			8,898
Balances at Dec. 31, 2020	713,399	144,288	(843,230)	204,078	1,797,759	(645,741)	56,245
Cash dividends declared:
Purchase of subsidiary shares from noncontrolling interest	(561)			(4,527)			3,966
Net income (loss)	2,729				(3,249)		5,978
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
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

CONSOLIDATED STATEMENTS OF CH_2

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Deferred income taxes	$ (10,622)	$ (6,241)	$ 1,749
Stock appreciation rights exercised (in shares)	16,671	28,789	6,236
Vesting of restricted stock units (in shares)	257,423	193,260	138,225
Vesting of performance shares (in shares)		69,127	265,151

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Consolidation The consolidated financial statements include all accounts of Harsco 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). Reclassifications Certain reclassifications have been made to prior year amounts to conform with current year classifications. During the year ended December 31, 2022, the Company recognized $2.6 million in revenues as an out-of-period adjustment in the CE Segment. Such adjustment was not considered material to the Company's consolidated financial statements for the year ended December 31, 2022 or any of the financial statements for the previously filed annual periods. 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 $3.8 million and $4.2 million at December 31, 2022 and 2021, 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 or unwillingness 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 Depreciation 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 Consolidated Balance Sheets. See Note 8, Debt and Credit Agreements Note 9, Leases Business Combinations and Goodwill The Company accounts for business combinations using the acquisition method of accounting, which requires that. once control is obtained, all assets acquired and liabilities assumed, including amounts attributable to noncontrolling interests, be recorded at their respective fair values at the date of acquisition. The excess of the purchase price over the fair values of identifiable assets and liabilities is recorded as goodwill. The determination of fair value of assets acquired and liabilities assumed requires numerous estimates and assumptions with respect to the timing and amounts of cash flow projections, revenue growth rates, customer attrition rates, discount rates and useful lives. Such estimates are based upon assumptions believed to be reasonable, and, when appropriate, include assistance from independent third-party valuation firms. During the measurement period, which is up to one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed, with corresponding offsets to 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 or a quantitative test. 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 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, Net 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. 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, 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. Harsco 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. 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. Harsco Rail - This business sells railway track maintenance equipment, after-market parts, Protran/safety equipment and provides railway track maintenance services. • 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 $$50 million was recognized using the cost-to-cost method in 2022, the net profit or loss of which is included in Income (loss) from discontinued businesses in the 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 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 2022, 2021 and 2020, the Company recorded insurance reserve adjustments that decreased pre-tax insurance expense from continuing operations for self-insured programs by $1.0 million, $0.2 million and $1.3 million, respectively. At December 31, 2022 and 2021, the Company has recorded liabilities of $32.4 million and $28.3 million, respectively, related to both asserted as well as unasserted insurance claims. Included in the balances at December 31, 2022 and 2021 were $4.0 million and $4.1 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 Consolidated Balance Sheets. Foreign Currency Translation The financial statements of the Company's subsidiaries outside the U.S., except for those subsidiaries located 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, 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 (

Recently Adopted and Recently I

Recently Adopted and Recently Issued Accounting Standards	12 Months Ended
	Dec. 31, 2022
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 2022: On January 1, 2022, the Company adopted changes issued by the FASB which improved the transparency of government assistance received by entities. The adoption of these changes did not have a material impact on the Company's consolidated financial statements. As of December 31, 2022, the Company adopted changes issued by the FASB which provided companies with optional guidance to ease the potential accounting burden associated with transitioning from reference rates that are expected to be discontinued, particularly the cessation of LIBOR. The adoption of these changes did not have a material impact on the Company's consolidated financial statements. The following accounting standards have been issued and become effective for the Company at a future date: In October 2021, the FASB issued changes clarifying 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. Prior guidance required acquired contract assets and contract liabilities to be measured at fair value on the acquisition date. The changes become effective January 1, 2023. The adoption of these changes does not have an immediate impact on the Company's consolidated financial statements, but will be applied prospectively to any future business combinations. In September 2022, the FASB issued changes 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 changes become effective January 1, 2023, generally with retrospective application to each period in which a balance sheet is presented. Other than potential required expanded disclosures, the adoption of these changes will not have a material impact on the Company's consolidated financial statements.

Discontinued Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2022
Business Combinations [Abstract]
Acquisitions and Dispositions	Discontinued Operations Harsco Rail Segment The Company is in the process of selling the Rail business with a sale expected to occur in 2023. The intention to sell the business was first announced in the fourth quarter of 2021. The sales process was delayed in 2022 due to certain macroeconomic conditions, including rising interest rates. The former Harsco Rail Segment has historically been a separate reportable segment with primary operations in the United States, Europe and Asia Pacific. The former Harsco Rail Segment's balance sheet positions as of December 31, 2022 and 2021 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 December 31 Trade accounts receivable, net $ 41,049 $ 33,689 Other receivables 4,037 4,740 Inventories 105,256 103,560 Current portion of contract assets 84,848 94,597 Other current assets 30,950 25,442 Property, plant and equipment, net 41,004 39,524 Right-of-use assets, net 5,635 3,108 Goodwill 13,026 13,026 Intangible assets, net 2,746 3,081 Deferred income tax assets 6,887 6,064 Other assets 807 6,432 Total Rail assets included in Assets held-for-sale $ 336,245 $ 333,263 Accounts payable $ 49,083 $ 46,076 Accrued compensation 1,211 2,171 Current portion of operating lease liabilities 2,635 1,619 Current portion of advances on contracts 45,037 62,401 Other current liabilities 61,039 49,732 Operating lease liabilities 3,121 1,775 Deferred tax liabilities 5,480 5,736 Other liabilities 861 981 Total Rail liabilities included in Liabilities of assets held-for-sale $ 168,467 $ 170,491 The results of the former Harsco Rail Segment are presented as discontinued operations and, as such, have been excluded from both continuing operations and segment results for the years ended December 31, 2022, 2021, and 2020. Certain key selected financial information included in Income (loss) from discontinued operations, net of tax, for the former Harsco Rail Segment is as follows: Years Ended December 31 (In thousands) 2022 2021 2020 Amounts directly attributable to the former Harsco Rail Segment: Service revenues $ 29,331 $ 32,425 $ 31,642 Product revenues (a) 215,585 266,221 298,189 Cost of services sold 21,034 17,272 23,480 Cost of products sold 225,769 251,897 235,040 Income (loss) from discontinued businesses (40,898) (19,967) 23,096 Additional amounts allocated to the former Harsco Rail Segment: Selling, general and administrative expenses (b) $ 4,039 $ 178 $ — (a) The decrease in product revenues for 2022, as compared to 2021 and 2020, 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 The Company has retained corporate overhead expenses previously allocated to the former Harsco Rail Segment of $4.2 million for each of the years ended December 31, 2022, 2021, and 2020 as part of Selling, general and administrative expenses on the Consolidated Statements of Operations. The Company's former Harsco Rail segment is currently manufacturing highly-engineered equipment under large long-term fixed-price contracts with Network Rail, Deutsche Bahn and SBB. As previously disclosed, in the fourth quarter of 2021 the Company recognized an estimated forward loss provision of $33.4 million related to these contracts. In 2022, the Company encountered continued supply chain related delays and additional costs in building the machines. For the Network Rail contracts, the Company encountered supply chain delays in the build of the initial machine, and there were further changes to the production schedule based on the manufacturing experience gained from assembling the first unit during the first quarter of 2022, which had a cascading effect on the delivery schedule of remaining machines. During 2022, the Company recorded additional forward loss provisions of $29.1 million, principally for additional estimated contractual liquidated damages as a reduction of revenue, of which $24.2 million was recorded in the first quarter of 2022, $0.3 million was recorded in the second quarter of 2022 and $4.6 million was recorded in the fourth quarter of 2022. The Company continues to negotiate with Network Rail regarding a reduction to these liquidated damages, which could result in additional favorable or unfavorable adjustments in future periods. For the Deutsche Bahn contract, in March 2022 a European-based supplier of critical components to the project, indicated it would be significantly late on the delivery of these components to the project, which has the impact of delaying the overall delivery schedule for the project. Additionally, this supplier filed for bankruptcy during the second quarter of 2022, although it continues to operate. Delays impacting the project, along with rising costs, resulted in an additional estimated forward loss provision of $7.5 million in the first quarter of 2022 and $4.0 million recorded in the fourth quarter of 2022 for a total loss provision of $11.5 million in 2022, of which $3.1 million is due to the estimated contractual penalties that would be triggered by the delay and thus recorded as a reduction of revenue. Should this supplier cease operations, the Company may incur further losses if there are additional costs to change suppliers or if there is an inability to recover the value of prepayments made to the supplier, as well as incur additional penalties and damages under the contract with Deutsche Bahn in the event of further production delays. For the second SBB contract, the Company recorded an additional $3.5 million forward estimated loss provision in the first quarter of 2022 due to additional supply chain delays and cost overruns. 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 first contract with SBB is complete, and the second contract is 83% complete as of December 31, 2022. The contracts with Network Rail and Deutsche Bahn are 50% and 32% complete, respectively, as of December 31, 2022. The following is selected financial information included on the Consolidated Statements of Cash Flows attributable to the Rail Segment: Years Ended December 31 (In thousands) 2022 2021 2020 Non-cash operating items Depreciation and amortization $ — $ 4,329 $ 5,450 Cash flows from investing activities Purchases of property, plant and equipment 1,618 1,406 7,962

Accounts Receivable and Note Re

Accounts Receivable and Note Receivable (Notes)	12 Months Ended
	Dec. 31, 2022
Receivables [Abstract]
Accounts Receivable and Note Receivable	Accounts Receivable and Note Receivable Accounts receivable consist of the following: (In thousands) December 31 December 31 2021 (a) Trade accounts receivable $ 272,775 $ 389,535 Less: Allowance for expected credit losses (b) (8,347) (11,654) Trade accounts receivable, net $ 264,428 $ 377,881 Other receivables (c) $ 25,379 $ 33,059 (a) The December 31, 2021 amounts for trade accounts receivable and allowance for expected credit losses have been revised from the presentation in the Company's 2021 Form 10-K. This revision did not impact trade accounts receivable, net. (b) The decrease in the allowance for expected credit losses is principally due to the write-off of previously reserved trade accounts receivable balances. (c) 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) 2022 2021 2020 Provision for expected credit losses related to trade accounts receivable $ 403 $ 589 $ 1,961 At December 31, 2022, $11.1 million of the Company's trade accounts receivable were past due by twelve months or more, with $3.9 million of this amount reserved. There has been a recent increase in aged receivables for certain international customers within the Harsco Environmental Segment. Collection of the remaining balance is still ultimately expected. 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 $145.0 million as of December 31, 2022. The SPE owned $69.7 million of trade receivables as of December 31, 2022, 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. 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 from operating activities in the Consolidated Statements of Cash Flows: Year Ended December 31 (In millions) 2022 Upon execution in June 2022 $ 120.0 Additional proceeds 25.0 Total received $ 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 December 31 Net amounts sold under factoring arrangements $ 17.3 $ 12.9 Program capacities 31.4 16.5 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 U.S. Treasury spot rate. The Company received payments of $8.6 million and $6.4 million during 2022 and 2021, respectively, related to excess cash flow. The following table reflects the note receivable at amortized cost and at fair value: (In millions) December 31 December 31 Note receivable, at amortized cost $ 23.9 $ 31.0 Note receivable, at fair value $ 23.8 $ 32.3

Inventories

Inventories	12 Months Ended
	Dec. 31, 2022
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories consist of the following: (In thousands) December 31 December 31 Finished goods $ 11,809 $ 8,323 Work-in-process 4,241 5,393 Raw materials and purchased parts 25,735 21,188 Stores and supplies 39,590 35,589 Total inventories $ 81,375 $ 70,493 Valued at lower of cost or market: LIFO basis $ 15,473 $ 14,133 FIFO basis 8,826 7,567 Average cost basis 57,076 48,793 Total inventories $ 81,375 $ 70,493

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment consist of the following: (In thousands) Estimated December 31 December 31 Land — $ 72,020 $ 73,067 Land improvements 5-20 years 16,750 16,970 Buildings and improvements (a) 10-30 years 217,926 221,236 Machinery and equipment (b) 3-20 years 1,513,238 1,507,214 Uncompleted construction — 84,472 63,816 Gross property, plant and equipment 1,904,406 1,882,303 Less: Accumulated depreciation (1,247,531) (1,228,390) Property, plant and equipment, net $ 656,875 $ 653,913 (a) Buildings and improvements include leasehold improvements that are amortized over the shorter of their useful lives or the initial term of the lease. (b) Includes information technology hardware and software.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill by Segment The following table reflects the changes in carrying amounts of goodwill by segment for the years ended December 31, 2022 and 2021: (In thousands) Harsco Environmental Harsco Consolidated Balance at December 31, 2020 $ 406,401 $ 482,647 $ 889,048 Changes to goodwill — 1,232 1,232 Foreign currency translation (7,171) — (7,171) 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 The Company's methodology for determining reporting unit fair value 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. As of June 30, 2022, the Company determined that an interim test of goodwill was required. The triggering event was principally due to lower earnings expectations due to the impacts of inflation. The Company used a discounted cash flow model (“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 weighted-average cost of capital (“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. The performance of the Company's 2022 annual impairment tests did not result in any impairment of the Company's goodwill. Intangible Assets Net intangible assets totaled $352.2 million at December 31, 2022 and $402.8 million at December 31, 2021. The following table reflects these intangible assets by major category: December 31, 2022 December 31, 2021 (In thousands) Gross Carrying Accumulated Gross Carrying Accumulated Customer related $ 95,573 $ 54,482 $ 104,322 $ 54,057 Permits 309,177 50,703 309,069 34,822 Technology related 20,800 15,491 39,886 13,415 Trade names 30,212 9,198 30,738 6,842 Air rights 26,139 2,411 26,139 1,675 Patents 189 155 179 138 Non-compete agreement 2,500 1,718 2,500 1,094 Other 3,147 1,419 3,407 1,396 Total $ 487,737 $ 135,577 $ 516,240 $ 113,439 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 the intangible assets, after the impairment charge, is $15.3 million at December 31, 2022. Amortization expense for intangible assets was $31.1 million, $32.2 million and $30.6 million for 2022, 2021 and 2020, respectively. The following table shows the estimated amortization expense for the next five fiscal years based on current intangible assets. (In thousands) 2023 2024 2025 2026 2027 Estimated amortization expense (b) $ 28,200 $ 27,700 $ 27,500 $ 25,700 $ 24,400 (b) These estimated amortization expense amounts do not reflect the potential effect of future foreign currency exchange rate fluctuations.

Debt and Credit Agreements

Debt and Credit Agreements	12 Months Ended
	Dec. 31, 2022
Debt Disclosure [Abstract]
Debt and Credit Agreements	Debt and Credit Agreements The Company's long-term debt consists of the following: (In thousands) December 31 December 31 Senior Secured Credit Facilities (a) : New Term Loan with an interest rate of 6.69% and 2.75% at December 31, 2022 and 2021, respectively $ 492,500 $ 497,500 Revolving Credit Facility with an average interest rate of 7.19% and 2.45% at December 31, 2022 and 2021, respectively 370,000 362,000 5.75% Senior Notes 475,000 500,000 Other financing payable (including capital leases) in varying amounts due principally through 2026 with a weighted-average interest rate of 5.00% and 4.73% at December 31, 2022 and 2021, respectively 26,661 28,389 Total debt obligations 1,364,161 1,387,889 Less: deferred financing costs (15,172) (18,217) Total debt obligations, net of deferred financing costs 1,348,989 1,369,672 Less: current maturities of long-term debt (11,994) (10,226) Long-term debt $ 1,336,995 $ 1,359,446 (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, 2022 and 2021. The maturities of long-term debt for the four years following December 31, 2023 are as follows: (In thousands) 2024 $ 11,293 2025 9,635 2026 378,542 2027 481,983 Cash payments for interest on debt were $73.4 million, $60.9 million and $59.5 million in 2022, 2021 and 2020, 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 the former Harsco Rail Segment, 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 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 the former Harsco Rail Segment. 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 3.0x upon closing of the divestiture of the former Harsco Rail Segment), and leveling at 3.0x 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, 2022, 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 5.35x and the total interest coverage ratio was 3.14x. 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 continued deterioration in economic conditions, higher than forecasted interest rate increases, or an inability to successfully execute its plans by quarter to realize increased pricing and to implement cost reduction initiatives that substantially mitigate the impacts of inflation and other factors adversely impacting 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) 2022 2021 2020 Gain (loss) on extinguishment of debt $ 2,254 $ (2,668) $ — Unused debt commitment and amendment fees (1,696) (2,838) (1,920) Securitization and factoring fees (3,514) — — Facility fees and debt-related income (expense) $ (2,956) $ (5,506) $ (1,920) 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, 2022. December 31, 2022 (In thousands) Facility Outstanding Outstanding Letters of Credit Available Revolving Credit Facility $ 700,000 $ 370,000 $ 27,318 $ 302,682

Leases

Leases	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Leases	Leases The components of lease expense were as follows: (In thousands) 2022 2021 2020 Finance leases: Amortization expense $ 3,938 $ 2,510 $ 1,523 Interest on lease liabilities 784 495 184 Operating leases 33,773 32,544 28,537 Variable and short-term leases 49,811 47,780 40,953 Sublease income (6) (53) (202) Total lease expense from continuing operations $ 88,300 $ 83,276 $ 70,995 Supplemental cash flow information related to leases was as follows: (In thousands) 2022 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Cash flows used by operating activities - Operating leases (a) $ 34,420 $ 33,645 $ 28,057 Cash flows used by operating activities - Finance leases 798 517 184 Cash flows used by financing activities - Finance leases 3,975 2,330 1,183 ROU assets obtained in exchange for lease obligations: Operating leases (b) $ 32,817 $ 42,442 $ 69,044 Finance leases 11,175 11,495 6,220 (a) Cash flows include cash paid for operating leases of discontinued operations. (b) Cash flows include ROU assets of approximately $56 million that were recorded upon the acquisition of ESOL in 2020. Supplemental balance sheet information related to leases was as follows: (In thousands) 2022 2021 Operating Leases (c): Operating lease ROU assets $ 101,253 $ 101,576 Current portion of operating lease liabilities 25,521 25,590 Operating lease liabilities 75,246 74,571 Finance Leases: Property, plant and equipment, net $ 23,671 $ 17,185 Current maturities of long-term debt 5,562 3,756 Long-term debt 18,832 13,736 (c) The 2021 operating lease ROU assets and operating lease liabilities include a $15 million adjustment to record certain leases for ESOL. These leases have been incorrectly treated as short term leases versus operating leases since ESOL's acquisition on April 6, 2020. Supplemental additional information related to leases was as follows: 2022 2021 Other information: Weighted average remaining lease term - Operating leases (in years) 7.42 7.14 Weighted average remaining lease term - Finance leases (in years) 5.35 5.88 Weighted average discount rate - Operating leases 6.0 % 5.9 % Weighted average discount rate - Finance leases 5.2 % 4.6 % Maturities of lease liabilities were as follows: (In thousands) Operating Leases Finance Year Ending December 31: 2023 $ 30,274 $ 6,663 2024 24,099 6,284 2025 17,928 5,237 2026 13,416 3,923 2027 8,545 2,240 After 2027 34,233 3,868 Total lease payments 128,495 28,215 Less: Imputed interest (27,728) (3,821) Total lease liabilities $ 100,767 $ 24,394 The Company's leases, excluding short-term leases, have remaining terms of less than one year to 28 years, some of which include options to extend for up to 10 years, and some of which include options to terminate within one year. As of December 31, 2022, the Company has additional operating leases for property and equipment that have not yet commenced, with estimated ROU assets and lease liabilities of approximately $11 million to be recognized upon anticipated lease commencements in the first and second quarters of 2023. There are no material residual value guarantees or material restrictive covenants in any of the Company's leases.
Leases	Leases The components of lease expense were as follows: (In thousands) 2022 2021 2020 Finance leases: Amortization expense $ 3,938 $ 2,510 $ 1,523 Interest on lease liabilities 784 495 184 Operating leases 33,773 32,544 28,537 Variable and short-term leases 49,811 47,780 40,953 Sublease income (6) (53) (202) Total lease expense from continuing operations $ 88,300 $ 83,276 $ 70,995 Supplemental cash flow information related to leases was as follows: (In thousands) 2022 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Cash flows used by operating activities - Operating leases (a) $ 34,420 $ 33,645 $ 28,057 Cash flows used by operating activities - Finance leases 798 517 184 Cash flows used by financing activities - Finance leases 3,975 2,330 1,183 ROU assets obtained in exchange for lease obligations: Operating leases (b) $ 32,817 $ 42,442 $ 69,044 Finance leases 11,175 11,495 6,220 (a) Cash flows include cash paid for operating leases of discontinued operations. (b) Cash flows include ROU assets of approximately $56 million that were recorded upon the acquisition of ESOL in 2020. Supplemental balance sheet information related to leases was as follows: (In thousands) 2022 2021 Operating Leases (c): Operating lease ROU assets $ 101,253 $ 101,576 Current portion of operating lease liabilities 25,521 25,590 Operating lease liabilities 75,246 74,571 Finance Leases: Property, plant and equipment, net $ 23,671 $ 17,185 Current maturities of long-term debt 5,562 3,756 Long-term debt 18,832 13,736 (c) The 2021 operating lease ROU assets and operating lease liabilities include a $15 million adjustment to record certain leases for ESOL. These leases have been incorrectly treated as short term leases versus operating leases since ESOL's acquisition on April 6, 2020. Supplemental additional information related to leases was as follows: 2022 2021 Other information: Weighted average remaining lease term - Operating leases (in years) 7.42 7.14 Weighted average remaining lease term - Finance leases (in years) 5.35 5.88 Weighted average discount rate - Operating leases 6.0 % 5.9 % Weighted average discount rate - Finance leases 5.2 % 4.6 % Maturities of lease liabilities were as follows: (In thousands) Operating Leases Finance Year Ending December 31: 2023 $ 30,274 $ 6,663 2024 24,099 6,284 2025 17,928 5,237 2026 13,416 3,923 2027 8,545 2,240 After 2027 34,233 3,868 Total lease payments 128,495 28,215 Less: Imputed interest (27,728) (3,821) Total lease liabilities $ 100,767 $ 24,394 The Company's leases, excluding short-term leases, have remaining terms of less than one year to 28 years, some of which include options to extend for up to 10 years, and some of which include options to terminate within one year. As of December 31, 2022, the Company has additional operating leases for property and equipment that have not yet commenced, with estimated ROU assets and lease liabilities of approximately $11 million to be recognized upon anticipated lease commencements in the first and second quarters of 2023. There are no material residual value guarantees or material restrictive covenants in any of the Company's leases.
Leases	Leases The components of lease expense were as follows: (In thousands) 2022 2021 2020 Finance leases: Amortization expense $ 3,938 $ 2,510 $ 1,523 Interest on lease liabilities 784 495 184 Operating leases 33,773 32,544 28,537 Variable and short-term leases 49,811 47,780 40,953 Sublease income (6) (53) (202) Total lease expense from continuing operations $ 88,300 $ 83,276 $ 70,995 Supplemental cash flow information related to leases was as follows: (In thousands) 2022 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Cash flows used by operating activities - Operating leases (a) $ 34,420 $ 33,645 $ 28,057 Cash flows used by operating activities - Finance leases 798 517 184 Cash flows used by financing activities - Finance leases 3,975 2,330 1,183 ROU assets obtained in exchange for lease obligations: Operating leases (b) $ 32,817 $ 42,442 $ 69,044 Finance leases 11,175 11,495 6,220 (a) Cash flows include cash paid for operating leases of discontinued operations. (b) Cash flows include ROU assets of approximately $56 million that were recorded upon the acquisition of ESOL in 2020. Supplemental balance sheet information related to leases was as follows: (In thousands) 2022 2021 Operating Leases (c): Operating lease ROU assets $ 101,253 $ 101,576 Current portion of operating lease liabilities 25,521 25,590 Operating lease liabilities 75,246 74,571 Finance Leases: Property, plant and equipment, net $ 23,671 $ 17,185 Current maturities of long-term debt 5,562 3,756 Long-term debt 18,832 13,736 (c) The 2021 operating lease ROU assets and operating lease liabilities include a $15 million adjustment to record certain leases for ESOL. These leases have been incorrectly treated as short term leases versus operating leases since ESOL's acquisition on April 6, 2020. Supplemental additional information related to leases was as follows: 2022 2021 Other information: Weighted average remaining lease term - Operating leases (in years) 7.42 7.14 Weighted average remaining lease term - Finance leases (in years) 5.35 5.88 Weighted average discount rate - Operating leases 6.0 % 5.9 % Weighted average discount rate - Finance leases 5.2 % 4.6 % Maturities of lease liabilities were as follows: (In thousands) Operating Leases Finance Year Ending December 31: 2023 $ 30,274 $ 6,663 2024 24,099 6,284 2025 17,928 5,237 2026 13,416 3,923 2027 8,545 2,240 After 2027 34,233 3,868 Total lease payments 128,495 28,215 Less: Imputed interest (27,728) (3,821) Total lease liabilities $ 100,767 $ 24,394 The Company's leases, excluding short-term leases, have remaining terms of less than one year to 28 years, some of which include options to extend for up to 10 years, and some of which include options to terminate within one year. As of December 31, 2022, the Company has additional operating leases for property and equipment that have not yet commenced, with estimated ROU assets and lease liabilities of approximately $11 million to be recognized upon anticipated lease commencements in the first and second quarters of 2023. There are no material residual value guarantees or material restrictive covenants in any of the Company's leases.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2022
Retirement Benefits [Abstract]
Employee Benefit Plans	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. 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 2022, 2021 and 2020. For non-U.S. employees, this match is up to 6% of eligible compensation with an additional 2% going towards insurance and administrative costs. NPPC from continuing operations for U.S. and international plans for 2022, 2021 and 2020 is as follows: U.S. Plans International Plans (In thousands) 2022 2021 2020 2022 2021 2020 Net Periodic Pension Cost (Income): Defined benefit pension plans: Service cost $ — $ — $ — $ 1,867 $ 1,805 $ 1,642 Interest cost 5,716 4,813 7,381 16,500 12,652 17,599 Expected return on plan assets (10,795) (12,199) (11,368) (38,891) (45,018) (41,013) Recognized prior service costs — — — 534 582 512 Recognized losses 4,732 5,538 5,100 13,060 18,119 14,723 Settlement/curtailment loss (gain) — — — (33) (6) 18 Defined benefit pension plan cost (income) (347) (1,848) 1,113 (6,963) (11,866) (6,519) U.S. Plans International Plans (In thousands) 2022 2021 2020 2022 2021 2020 Multiemployer pension plans 642 640 620 1,114 1,035 969 Defined contribution plans 5,401 5,660 4,769 4,122 4,196 3,994 Net periodic pension cost (income) $ 5,696 $ 4,452 $ 6,502 $ (1,727) $ (6,635) $ (1,556) The change in the financial status of the defined benefit pension plans and amounts recognized on the Consolidated Balance Sheets at December 31, 2022 and 2021 are as follows: U.S. Plans International Plans (In thousands) 2022 2021 2022 2021 Change in benefit obligation: Benefit obligation at beginning of year $ 277,007 $ 296,660 $ 1,022,198 $ 1,119,552 Service cost — — 1,867 1,805 Interest cost 5,716 4,813 16,500 12,652 Plan participants' contributions — — 14 15 Actuarial (gain) loss (57,841) (8,063) (299,841) (58,567) Settlements/curtailments — — (132) (269) Benefits paid (15,700) (16,403) (37,135) (39,831) Effect of foreign currency — — (106,281) (13,159) Benefit obligation at end of year $ 209,182 $ 277,007 $ 597,190 $ 1,022,198 Change in plan assets: Fair value of plan assets at beginning of year $ 232,947 $ 226,125 $ 973,252 $ 957,177 Actual return on plan assets (41,909) 19,005 (250,002) 40,382 Employer contributions 1,706 4,219 22,614 25,077 Plan participants' contributions — — 14 15 Settlements/curtailments — — (132) (269) Benefits paid (15,700) (16,402) (37,135) (39,220) Effect of foreign currency — — (101,377) (9,910) Fair value of plan assets at end of year $ 177,044 $ 232,947 $ 607,234 $ 973,252 Funded status at end of year $ (32,138) $ (44,060) $ 10,044 $ (48,946) Significant items impacting actuarial gains and losses for 2022 for U.S. plans were improvement in the funded position due to an increase in the discount rate used to measure the benefit obligation compared with the prior year, partially offset by a decrease in the funded position due to the actual return on the fair value of plan assets since the prior measurement date being less than assumed, due to market losses. Similarly, significant items impacting actuarial gains and losses for 2022 for international plans, principally the U.K. plan, were improvement in the funded position due to an increase in the discount rate used to measure the benefit obligation compared with the prior year, partially offset by a decrease in the funded position due to the actual return on the fair value of plan assets since the prior measurement date being less than assumed, due to market losses. Amounts recognized on the Consolidated Balance Sheets for defined benefit pension plans consist of the following at December 31, 2022 and 2021: U.S. Plans International Plans December 31 December 31 (In thousands) 2022 2021 2022 2021 Noncurrent assets $ — $ — $ 26,033 $ 2,046 Current liabilities 1,851 1,999 924 967 Noncurrent liabilities 30,287 42,061 15,065 50,025 AOCI 105,005 114,874 346,068 410,114 Amounts recognized in AOCI for defined benefit pension plans consist of the following at December 31, 2022 and 2021: U.S. Plans International Plans (In thousands) 2022 2021 2022 2021 Net actuarial loss $ 105,005 $ 114,874 $ 337,849 $ 400,497 Prior service cost — — 8,219 9,617 Total $ 105,005 $ 114,874 $ 346,068 $ 410,114 The Company's estimate of expected contributions to be paid in 2023 for the U.S. and international defined benefit plans total $1.9 million and $23.3 million, respectively. Future Benefit Payments Expected benefit payments for defined benefit pension plans over the next ten years are as follows: (In millions) 2023 2024 2025 2026 2027 2028-2032 U.S. Plans $ 26.3 $ 16.4 $ 16.4 $ 16.2 $ 16.1 $ 76.6 International Plans 38.1 38.8 40.2 41.3 42.7 225.4 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 2022, 2021 and 2020 were as follows: U.S. Plans International Plans Global Weighted-Average 2022 2021 2020 2022 2021 2020 2022 2021 2020 Discount rates 2.7 % 2.4 % 3.2 % 1.9 % 1.4 % 2.1 % 2.1 % 1.6 % 2.4 % Expected long-term rates of return on plan assets 6.3 % 6.8 % 7.0 % 4.4 % 4.7 % 5.2 % 4.7 % 5.1 % 5.6 % The expected long-term rates of return on defined benefit pension plan assets for the 2023 NPPC are 7.0% for the U.S. plans and 5.1% for the international plans. The expected global long-term rate of return on assets for 2023 is 5.5%. The weighted-average actuarial assumptions used to determine the defined benefit pension plan obligations at December 31, 2022 and 2021 were as follows: U.S. Plans International Plans Global Weighted-Average December 31 December 31 December 31 2022 2021 2022 2021 2022 2021 Discount rates 5.3 % 2.7 % 5.1 % 1.9 % 5.1 % 2.1 % 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, 2022 and 2021 or the defined benefit pension plan NPPC for the years ended 2022, 2021 and 2020. 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, 2022 and 2021 was as follows: U.S. Plans International Plans December 31 December 31 (In millions) 2022 2021 2022 2021 Accumulated benefit obligation $ 209.2 $ 277.0 $ 593.4 $ 1,016.1 Defined Benefit Pension Plans with Accumulated Benefit Obligation in Excess 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, 2022 and 2021 were as follows: U.S. Plans International Plans December 31 December 31 (In millions) 2022 2021 2022 2021 Projected benefit obligation $ 209.2 $ 277.0 $ 25.3 $ 988.6 Accumulated benefit obligation 209.2 277.0 22.6 984.7 Fair value of plan assets 177.0 232.9 9.4 939.3 The asset allocations attributable to the Company's U.S. defined benefit pension plans at December 31, 2022 and 2021, and the long-term target allocation of plan assets, by asset category, are as follows: Target Long-Term Percentage of Plan Assets U.S. Plans Asset Category 2022 2021 Domestic equity securities 18%-28% 21.0 % 22.8 % International equity securities 17%-27% 22.2 % 22.5 % Fixed income securities 41%-51% 44.6 % 45.9 % Cash and cash equivalents Less than 5% 1.0 % — % Other (a) 4%-14% 11.2 % 8.8 % (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 2023 and 2022 are 7.0% and 6.3%, respectively. The U.S. defined benefit pension plans' assets include 310,000 shares at December 31, 2022 and 310,000 shares at December 31, 2021 of the Company's common stock, valued at $2.0 million and $5.2 million, respectively. These shares represented 1.1% and 2.2% of total U.S. plan assets at December 31, 2022 and 2021, respectively. The asset allocations attributable to the Company's international defined benefit pension plans at December 31, 2022 and 2021 and the long-term target allocation of plan assets, by asset category, are as follows: International Plans Asset Category Target Long-Term Percentage of Plan Assets 2022 2021 Equity securities 26.5 % 24.8 % 27.9 % Fixed income securities 65.5 % 65.5 % 63.6 % Cash and cash equivalents — 1.5 % 0.7 % Other (b) 8.0 % 8.2 % 7.8 % (b) Investments within this caption include diversified growth funds and real estate funds. International defined benefit pension plan assets at December 31, 2022 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 2023 and 2022 are 5.0% and 4.3%, 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, 2022 by asset class are as follows: (In thousands) Total Level 1 Investments Valued at Net Asset Value (c) 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 (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, 2021 by asset class are as follows: (In thousands) Total Level 1 Investments Valued at Net Asset Value Domestic equities: Common stocks $ 5,180 $ 5,180 $ — Mutual funds—equities 48,411 48,411 — International equities: Mutual funds—equities 50,783 50,783 — Fixed income investments: Mutual funds—bonds 105,114 105,114 — Other—mutual funds 9,371 9,371 — Cash and money market accounts 1,624 1,624 — Other - partnerships/joint ventures 12,464 — 12,464 Total $ 232,947 $ 220,483 $ 12,464 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 fair values of the Company's international defined benefit pension plans' assets at December 31, 2021 by asset class are as follows: (In thousands) Total Level 1 Level 2 Equity securities: Mutual funds—equities $ 271,811 $ — $ 271,811 Fixed income investments: Mutual funds—bonds 613,243 — 613,243 Insurance contracts 5,684 — 5,684 Other: Other mutual funds 75,651 — 75,651 Cash and money market accounts 6,863 6,863 — Total $ 973,252 $ 6,863 $ 966,389 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

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income TaxesCurrent 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) 2022 2021 2020 U.S. $ (152,602) $ (34,462) $ (87,315) International 29,644 71,968 33,095 Total income (loss) from continuing operations before income taxes and equity income $ (122,958) $ 37,506 $ (54,220) Income tax expense (benefit) as reported on the Consolidated Statements of Operations consists of the following: (In thousands) 2022 2021 2020 Income tax expense (benefit): Currently payable: U.S. federal $ — $ — $ (12,116) U.S. state 1,416 507 468 International 14,914 22,295 16,518 Total income taxes currently payable 16,330 22,802 4,870 Deferred U.S. federal (6,219) (4,594) (10,558) Deferred U.S. state (2,274) (18) (3,078) Deferred international 2,544 (9,101) 93 Total income tax expense (benefit) from continuing operations $ 10,381 $ 9,089 $ (8,673) Cash payments for income taxes were $20.9 million, $21.7 million and $34.9 million for 2022, 2021 and 2020, respectively. The cash payments for 2022 are relatively consistent with the payments for 2021. The decrease in cash payments for 2021 is principally due to payments associated with the gain on the sale of IKG in 2020 not recurring in 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) 2022 2021 2020 U.S. federal income tax expense (benefit), at statutory tax rate of 21% $ (25,821) $ 7,877 $ (11,386) U.S. state income taxes, net of federal income tax benefit (929) (310) (2,015) U.S. other domestic deductions and credits (594) (415) (1,312) Difference in effective tax rates on international earnings and remittances 8,929 4,488 7,872 Uncertain tax position contingencies and settlements (290) 783 289 Changes in realization of deferred tax assets 8,263 (5,035) (1,501) U.S. non-deductible expenses 791 936 2,300 Nondeductible goodwill impairment 19,548 — — State deferred tax rate changes 154 592 (40) Foreign derived intangible income deduction (938) — — Share-based compensation 1,268 173 (184) Net operating loss carryback — — (2,696) Total income tax expense (benefit) from continuing operations $ 10,381 $ 9,089 $ (8,673) At December 31, 2022, 2021 and 2020, the Company's annual effective income tax rate on income (loss) from continuing operations was (8.4)%, 24.2% and 16.0%, respectively. The Company’s international income from continuing operations before income taxes and equity income was $29.6 million and $72.0 million for 2022 and 2021, respectively. In 2021, the Company recorded $6.8 million income tax benefit arising from the recognition of deferred tax assets in HE Brazil. Brazil has 3 years of cumulative income and expects to utilize the deferred tax assets against future income. Also, in 2021, the Company recorded a $7.0 million nontaxable capital gain on the sale of U.K. assets not recurring in 2022. In 2022, the Company recorded a $15.0 million intangible assets impairment for the Altek business with no tax benefit. The Company's total international income tax expense increased from $13.2 million in 2021 to $17.4 million in 2022 primarily due to the Brazil income tax benefit in 2021 not recurring in 2022, partially offset by the change in mix of income. The Company’s differences in income tax expense for 2022 and 2021 on international earnings and remittances was $10.3 million and $4.5 million, respectively, which included U.S income tax expense on international deemed remittances of $0.1 million and $0.1 million respectively. The increase is primarily due to no tax benefit recorded on the $15.0 million intangible assets impairment recorded for the Altek business and the change in mix of income. The Company's U.S. loss from continuing operations before income taxes and equity income was $152.6 million and $34.5 million for 2022 and 2021, respectively. The Company's total U.S. income tax benefit increased from $4.1 million in 2021 to $7.1 million in 2022 primarily due to the reduced operational profit and a $3.0 million tax benefit recorded on the deductible portion of the goodwill impairment recorded for the Clean Earth business, offset by partially disallowed interest expense. The income tax effects of the temporary differences giving rise to the Company's deferred tax assets and liabilities at December 31, 2022 and 2021 are as follows: 2022 (a) 2021 (a) (In thousands) Asset Liability Asset Liability Depreciation and amortization $ — $ 61,145 $ — $ 80,278 Right-of-use assets — 24,826 — 25,130 Operating lease liabilities 25,024 — 24,802 — Expense accruals 28,758 — 24,949 — Inventories 4,011 — 3,400 — Provision for receivables 2,781 — 3,997 — Deferred revenue 4,484 — — 2,750 Operating loss carryforwards 54,237 — 67,442 — Tax credit carryforwards 21,443 — 18,608 — Pensions 5,171 — 23,298 — Currency adjustments — 3,330 3,701 — Section 163(j) disallowed interest expense 13,869 — 4,843 — Research and development 2,795 — — — Stock based compensation 6,580 — 7,396 — Other — 3,198 2,164 — Subtotal 169,153 92,499 184,600 108,158 Valuation allowance (89,234) — (92,385) — Total deferred income taxes $ 79,919 $ 92,499 $ 92,215 $ 108,158 (a) Does not include approximately $1.0 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, 2022, the tax-effected amount of NOLs totaled $54.2 million. Tax-effected NOLs from international operations are $40.6 million. Of that amount, $35.5 million can be carried forward indefinitely and $5.1 million will expire at various times between 2023 and 2042. Tax-effected U.S. state NOLs are $12.1 million. Of that amount, $1.8 million expire at various times between 2023 and 2027, $2.5 million expire at various times between 2028 and 2032, $3.6 million expire at various times between 2033 and 2037 and $4.2 million expire at various times between 2038 and 2042. At December 31, 2022, the tax-effected amount of U.S. Federal NOLs totaled $1.5 million. Of that amount, $1.5 million can be carried forward indefinitely. Valuation allowances of $89.2 million and $92.4 million at December 31, 2022 and 2021, 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 2022, the Company recorded a valuation allowance reduction of $7.1 million related to current year pension adjustment recorded through AOCI, a valuation allowance reduction of $6.4 million from the effects of foreign currency translation adjustments and a valuation allowance reduction of $4.3 million related to the tax rate reduction in certain jurisdiction in U.S, partially offset by a $5.2 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 $8.9 million valuation allowance increase related to disallowed interest expense. 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 an income tax benefit of $0.4 million, an income tax expense of $0.4 million and $0.2 million during 2022, 2021 and 2020, respectively, for interest and penalties. The Company has accrued $1.3 million, $1.7 million and $1.4 million for the payment of interest and penalties at December 31, 2022, 2021 and 2020, respectively. A reconciliation of the change in the unrecognized income tax benefits balance from January 1, 2020 to December 31, 2022 is as follows: (In thousands) Unrecognized Deferred Unrecognized Balances, January 1, 2020 $ 3,129 $ (22) $ 3,107 Additions for tax positions related to the current year (includes currency translation adjustment) 596 (2) 594 Other reductions for tax positions related to prior years (771) — (771) Statutes of limitation expirations (58) 2 (56) Balance at December 31, 2020 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) Total unrecognized income tax benefits that, if recognized, would impact the effective income tax rate at December 31, 2022 $ 2,792 $ (21) $ 2,771 Within the next twelve months, it is reasonably possible that up to $1.1 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 challenge by the tax authorities. Positions challenged by the tax authorities may be settled or appealed by the Company. The tax years that remain subject to examination for the Company's major tax jurisdictions as of December 31, 2022 are shown below: Jurisdiction Earliest Open Year Brazil 2018 China 2017 France 2020 United States: Federal income tax 2014 State income tax 2016

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	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 December 31 Current portion of environmental liabilities (a) $ 7,120 $ 7,338 Long-term environmental liabilities 26,880 28,435 Total environmental liabilities $ 34,000 $ 35,773 (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. On March 28, 2018, the United States Environmental Protection Agency (the “EPA”) conducted an inspection of ESOL’s off-site 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 the Company’s purchase of the ESOL business. The Company is vigorously contesting the allegations. While it is the Company's position that any loss related to this issue will be recoverable under indemnity rights under the ESOL purchase agreement and representations and warranties insurance policies purchased by the Company, there can be no assurance that the Company's position will ultimately prevail. On August 31, 2022, the parties executed a Tolling Agreement, which excludes the period from March 1, 2022 through December 30, 2022, for the purposes of calculating the statute of limitations and other related defenses. On January 27, 2020, the U.S. 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 propose a sitewide cleanup plan no sooner than 2024 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 $6.2 million at December 31, 2022 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 (MPF and MPE) filed a Civil Public Action against one of the Company's customers (CSN), 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 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. On March 18, 2019 the Court issued an order fining the Company 5,000 Brazilian reais per day (or approximately $1 thousand per day) and CSN 20,000 Brazilian reais per day (or approximately $4 thousand per day) until the requirements of the injunction are met. On November 1, 2019 the Court issued an additional order increasing the fines assessed to the Company to 25,000 Brazilian reais per day (or approximately $5 thousand per day) and raising the fines assessed to CSN to 100,000 Brazilian reais per day (or approximately $19 thousand per day). The Court also assessed an additional fine of 10,000,000 Brazilian reais (or approximately $2 million) against CSN and the Company jointly. The Company is appealing the fines and the underlying injunction. Both the Company and CSN continue to have discussions with the Prosecution Offices and governmental authorities on 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, as well as the accrual of interest and penalties while the parties discuss a possible resolution of the matter. 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 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 on this matter before the Amsterdam District Court in the Netherlands. The Amsterdam Public Prosecutor’s Office issued the 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 prosecutor announced that they 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 Public Prosecutor’s Office 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 November 5, 2020, a worker suffered a fatal injury at a site owned by the Company’s customer, Gerdau Ameristeel US, Inc., 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. By a letter agreement dated December 1, 2022, the worker's family agreed to settle their claims against the Company and Gerdau. The parties are working to complete a formal settlement agreement. The Company has recorded a liability for its insurance deductible of $5 million and an indemnification receivable from its customer for the recovery of certain losses based upon the 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. On March 22, 2022, the U.S. 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. On March 21, 2022, the Company received a draft penalty matrix from the PA DEP 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, California and an administrative inspection warrant at a facility in Indianapolis, Indiana. 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. The Company has not accrued any amounts in respect of these investigations and cannot estimate the reasonably possible loss or the range of reasonably possible losses that it may incur, if any. Investigations of this type are, by their nature, uncertain and unpredictable. While it is the Company’s position that it has recourse for some or all liabilities, if any, that arise from these matters 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. 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, 2022, the principal amount of the tax assessment from the SPRA with regard to this case is approximately $1.1 million, with penalty, interest and fees assessed to date increasing such amount by an additional $16.9 million. On June 4, 2018, the Appellate Court of the State of Sao Paulo ruled in favor of the SPRA but ruled that the assessed penalty should be reduced to approximately $1.1 million. After calculating the interest accrued on the penalty, the Company estimates that this ruling reduces the current overall potential liability for this case to approximately $6.9 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 $4.8 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 $1.1 million, with penalty and interest assessed through that date increasing such amount by an additional $3.6 million. On December 6, 2018, the administrative tribunal reduced the applicable penalties to $0.8 million. After calculating the interest accrued on the current penalty, the Company estimates that the current overall liability for this case to be approximately $5.3 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. 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 $2.0 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 $3.4 million. On January 18, 2021, the Company filed a challenge to the assessment. 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. Other The Company is named as one of many defendants (approximately 90 or more in most cases) 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. The Company believes that the claims against it are without merit. 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. At December 31, 2022, there were 17,224 pending asbestos personal injury actions filed against the Company. Of those actions, 16,588 were filed in the New York Supreme Court (New York County), 115 were filed in other New York State Supreme Court Counties and 521 were filed in courts located in other states. The complaints in most of those actions generally follow a form that contains a standard damages demand of $20 million or $25 million, regardless of the individual plaintiff's alleged medical condition, and without identifying any specific Company product. At December 31, 2022, 16,549 of the actions filed in New York Supreme Court (New York County) 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. The remaining 39 cases in New York County are pending on the Active or In Extremis Docket created for plaintiffs who can demonstrate a malignant condition or physical impairment. 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. At December 31, 2022, the Company has obtained dismissal in 28,416 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. 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.

Capital Stock

Capital Stock	12 Months Ended
	Dec. 31, 2022
Equity [Abstract]
Capital Stock	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, 2020 to December 31, 2022: Shares Treasury Outstanding Outstanding, January 1, 2020 114,720,347 36,205,589 78,514,758 Shares issued for vested restricted stock units 229,413 91,188 138,225 Shares issued for vested performance stock units 471,412 206,261 265,151 Stock appreciation rights exercised 8,870 2,634 6,236 Outstanding, December 31, 2020 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 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) 2022 2021 2020 Income (loss) from continuing operations attributable to Harsco Corporation common stockholders $ (137,155) $ 22,137 $ (49,727) Weighted-average shares outstanding—basic 79,493 79,234 78,939 Dilutive effect of stock-based compensation — 1,055 — Weighted-average shares outstanding—diluted 79,493 80,289 78,939 Income (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders: Basic $ (1.73) $ 0.28 $ (0.63) Diluted $ (1.73) $ 0.28 $ (0.63) 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) 2022 2021 2020 Restricted stock units 672 — 714 Stock appreciation rights 2,092 826 2,474 Performance share units 1,040 865 887

Stock-Based Compensation

Stock-Based Compensation	12 Months Ended
	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	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 2020, 2021 and 2022 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 Plan and following the termination of the participant's service as a director under prior plans. RSUs do not have an option for cash payment. The following table summarizes RSUs issued and the compensation expense from continuing operations recorded for the years ended December 31, 2022, 2021, and 2020: RSUs (a) Weighted Average Fair Value Expense (Dollars in thousands, except per unit) 2022 2021 2020 Directors: 2019 14,211 25.33 $ — $ — $ 120 2020 34,986 10.29 — 120 240 2021 23,224 21.53 167 333 — 2022 63,696 7.85 333 — — Employees: 2017 286,251 13.70 — — 85 2018 242,791 19.93 — 142 706 2019 270,864 22.25 314 1,239 1,270 2020 522,087 8.22 741 1,093 1,244 2021 343,125 18.62 1,294 1,892 — 2022 450,915 12.36 1,486 — — Total $ 4,335 $ 4,819 $ 3,665 (a) Represents number of awards originally issued. RSU activity for the year ended December 31, 2022 was as follows: Number of Shares Weighted Average Non-vested at December 31, 2021 712,844 $ 14.68 Granted 514,611 11.80 Vested (342,907) 14.87 Forfeited (212,964) 14.28 Non-vested at December 31, 2022 671,584 $ 12.51 At December 31, 2022, the total unrecognized compensation expense related to non-vested RSUs was $4.5 million, which will be recognized over a weighted-average period of 1.8 years. The total fair value of RSU's vested in 2022, 2021 and 2020 was $5.1 million, $4.1 million and $4.3 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 Harsco 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. During 2020, the Company issued SARS covering 785,152 shares in March and 20,526 in October. During 2021, the Company issued SARS covering 184,641 shares in March. During 2022, the Company issued SARS covering 312,987 shares in March, and 10,000 each in September, October and December. The fair value of each SAR grant was estimated on the grant date using a Black-Scholes pricing model with the following assumptions: Risk-free Interest Rate Dividend Yield Expected Life (Years) Volatility SAR Grant Price Fair Value of SAR March 2020 Grant 0.76 % — % 6.0 45.2 % $ 10.29 $ 3.03 October 2020 Grant 0.44 % — % 6.0 60.3 % 14.89 8.12 March 2021 Grant 0.91 % — % 6.0 61.9 % 18.58 10.48 March 2022 Grant 1.67 % — % 6.0 60.3 % 12.65 7.20 September 2022 Grant 3.56 % — % 6.0 60.6 % 5.02 2.97 October 2022 Grant 4.10 % — % 6.0 61.3 % 5.26 3.17 December 2022 Grant 3.75 % — % 6.0 62.4 % 6.15 3.72 The March 2020 Grant's fair value was estimated using a Monte Carlo simulation because the exercise price is greater than the fair value of Harsco common stock on the grant date. SARs activity for the year ended December 31, 2022 was as follows: Number of Shares Weighted Average Exercise Price Aggregate Intrinsic Value (in millions) (b) Outstanding, December 31, 2021 2,394,055 $ 14.75 $ 8.6 Granted 342,987 12.02 Exercised (118,618) 7.97 Forfeited/Expired (526,562) 14.78 Outstanding, December 31, 2022 2,091,862 $ 14.68 0.0 (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. The total intrinsic value of SARs exercised in 2022, 2021 and 2020 was $0.0 million, $0.6 million, and $0.5 million, respectively. The following table summarizes information concerning outstanding and exercisable SARs at December 31, 2022: 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 - $13.70 777,700 383,485 $ 10.15 6.18 777,700 $ 9.67 $16.53 - $22.70 650,634 86,986 19.16 4.23 650,634 19.24 $23.25 - $26.92 193,057 — 24.79 1.62 193,057 24.79 1,621,391 470,471 $ 14.68 5.07 1,621,391 $ 15.31 Total compensation expense from continuing operations related to SARs was $1.5 million, $1.8 million and $1.7 million for the years ended December 31, 2022, 2021 and 2020, respectively. At December 31, 2022, total unrecognized compensation expense related to non-vested SARs was $1.7 million, which will be recognized over a weighted average period of 1.8 years. Weighted-average grant date fair value of non-vested SARs for the year ended December 31, 2022 was as follows: Number of Shares Weighted-Average Grant Date Fair Value Non-vested shares, December 31, 2021 664,880 $ 5.63 Granted 342,987 6.86 Vested (322,368) 5.54 Forfeited (215,028) 6.57 Non-vested shares, December 31, 2022 470,471 $ 6.16 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. During the year ended December 31, 2020, the Company granted 513,995 shares in March and 11,194 shares in October under the 2013 Plan. During the year ended December 31, 2021, the Company granted 316,959 shares in March under the 2013 Plan. During the year ended December 31, 2022, the Company granted 500,624 shares in March under the 2013 Plan. The fair value of PSUs granted was estimated on the grant date using a Monte Carlo pricing model with the following assumptions: Risk-free Interest rate Dividend Yield Expected Life (Years) Volatility Fair Value of PSU March 2020 Grant 0.56 % — % 2.81 36.0 % $ 4.40 October 2020 Grant 0.17 % — % 2.20 53.7 % 17.01 March 2021 Grant 0.25 % — % 2.83 50.7 % 25.38 March 2022 Grant 1.59 % — % 2.83 50.4 % 16.54 Total compensation expense from continuing operations related to PSUs was $4.2 million, $5.1 million and $3.2 million for the years ended December 31, 2022, 2021 and 2020, respectively. At December 31, 2022, total unrecognized compensation expense related to non-vested PSUs was $6.4 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, 2022 was as follows: Number of Shares Weighted-Average Grant Date Fair Value Non-vested shares, December 31, 2021 753,793 $ 13.05 Granted 500,624 16.54 Forfeited (213,999) 14.51 Vested, not issued (c) (378,466) 4.80 Non-vested shares, December 31, 2022 661,952 $ 19.94 (c) The measurement period for PSUs issued in 2020 ended on December 31, 2022 and these shares vested but will not be issued until the Board certifies the measurement period results in early 2023. 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 is issued as part of the ICFO's compensation. During the year ended December 31, 2022, the Company issued 87,765 shares at a weighted average price of $5.40 per share and total compensation expense of $0.5 million.

Financial Instruments

Financial Instruments	12 Months Ended
	Dec. 31, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Financial Instruments	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 $500.4 million, $519.4 million and $410.6 million at December 31, 2022, 2021 and 2020, 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, 2022 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 2022 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 2022, 2021 or 2020. 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 and CCIRs, 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, interest rate swaps and CCIRs 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, 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 December 31, 2021 Asset derivatives (Level 2): Foreign currency exchange forward contracts Other current assets $ 719 $ 1,405 $ 2,124 Total $ 719 $ 1,405 $ 2,124 Liability derivatives (Level 2): Foreign currency exchange forward contracts Other current liabilities $ 560 $ 2,905 $ 3,465 Interest rate swaps Other current liabilities 4,157 — 4,157 Total $ 4,717 $ 2,905 $ 7,622 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 subject to enforceable master netting arrangements, if offset, would have resulted in a $0.1 million and $0.9 million net liability at December 31, 2022 and 2021, 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 Amount Reclassified from (In thousands) 2022 2021 2020 2022 2021 2020 Foreign currency exchange forward contracts $ 1,966 $ 309 $ (930) $ (1,746) $ (129) $ (1,026) Interest rate swaps — (42) (3,889) 4,245 3,474 2,589 CCIRs (a) — — 39 — — 1,015 $ 1,966 $ 267 $ (4,780) $ 2,499 $ 3,345 $ 2,578 (a) Amounts represent changes in foreign currency translation related to balances in AOCI. The location and amount of gain (loss) recognized on the Consolidated Statements of Operations: 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 (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 $ (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 2020 (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 $ (58,196) $ 20,350 Interest rate swaps: Gain or (loss) reclassified from AOCI into income (2,589) — Foreign exchange contracts: Gain or (loss) reclassified from AOCI into income — 1,026 CCIRs: Gain or (loss) reclassified from AOCI into income (1,015) — 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) 2022 2021 2020 Foreign currency exchange forward contracts Cost of sales $ 19,808 $ 10,761 $ (9,052) (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 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 sold principally as a result of intercompany or third-party foreign currency exposures. At December 31, 2022 and December 31, 2021, the notional amounts of foreign currency exchange forward contracts were $573.8 million and $425.8 million, respectively. These contracts primarily hedge British pounds sterling and Euros against other currencies and mature through December 2023. 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 loss of $2.6 million during 2022 related to hedges of net investments, and pre-tax net gains of $2.7 million and $0.4 million during 2021 and 2020, respectively, in AOCI. 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 AOCI. The Company had a series of interest rate swaps that were in effect through 2022 and matured in December 2022. These swaps 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, ranging from 2.71% for 2021 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 AOCI 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, 2022 and 2021, the total fair value of long-term debt, including current maturities, was $1,227.6 million and $1,394.2 million, respectively, compared with a carrying value of $1,364.2 million and $1,387.9 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 receivable. 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 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.

Information by Segment and Geog

Information by Segment and Geographic Area	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Information by Segment and Geographic Area	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 2022, the Company had two reportable segments. These segments and the types of products and services offered include the following: Harsco Environmental The Segment provides environmental services and material processing to the global steel and metals industries. The Segment 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. The Segment'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, this Segment creates value-added downstream products from industrial waste streams. Harsco Clean Earth The Segment 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, 2022 and 2021, include principally cash, prepaid taxes, fair value of derivative instruments and U.S. deferred income taxes. Countries with revenues from unaffiliated customers or net property, plant and equipment 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) 2022 2021 2020 U.S. $ 1,075,355 $ 1,008,689 $ 830,699 All Other 813,710 839,710 703,334 Totals including Corporate $ 1,889,065 $ 1,848,399 $ 1,534,033 (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) 2022 2021 U.S. $ 283,864 $ 267,174 China 96,095 108,496 All Other 276,916 278,243 Totals including Corporate $ 656,875 $ 653,913 No customer provided in excess of 10% of the Company's consolidated revenues in 2022, 2021 and 2020. In 2022, 2021 and 2020, the Harsco Environmental Segment had one customer that provided in excess of 10% of this Segment's 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 2022, 2021, and 2020, Harsco Clean Earth had one customer that provided in excess of 10% of the Segment's 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) 2022 2021 2020 Revenues Harsco Environmental $ 1,061,239 $ 1,068,083 $ 914,445 Harsco Clean Earth 827,826 780,316 619,588 Total Revenues $ 1,889,065 $ 1,848,399 $ 1,534,033 Operating Income (Loss) Harsco Environmental $ 59,559 $ 103,402 $ 59,006 Harsco Clean Earth (81,785) 25,639 16,096 Corporate (35,117) (40,665) (78,408) Total Operating Income (Loss) $ (57,343) $ 88,376 $ (3,306) Total Assets Harsco Environmental $ 1,416,717 $ 1,386,087 $ 1,322,731 Harsco Clean Earth 980,774 1,278,472 1,279,387 Corporate 57,118 56,086 74,185 Discontinued Operations 336,245 333,263 316,984 Total Assets $ 2,790,854 $ 3,053,908 $ 2,993,287 Depreciation Harsco Environmental $ 108,880 $ 105,830 $ 100,971 Harsco Clean Earth 18,836 19,672 17,450 Corporate 1,996 1,900 2,022 Total Depreciation $ 129,712 $ 127,402 $ 120,443 Amortization Harsco Environmental $ 6,809 $ 8,052 $ 7,825 Harsco Clean Earth 24,299 24,180 22,814 Corporate (b) 3,029 2,710 2,961 Total Amortization $ 34,137 $ 34,942 $ 33,600 Capital Expenditures Harsco Environmental $ 109,508 $ 137,228 $ 99,056 Harsco Clean Earth 21,996 18,403 12,612 Corporate 4,038 1,289 488 Total Capital Expenditures $ 135,542 $ 156,920 $ 112,156 (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) 2022 2021 2020 Segment operating income (loss) $ (22,226) $ 129,041 $ 75,102 General Corporate expense (35,117) (40,665) (78,408) Operating income (loss) from continuing operations (57,343) 88,376 (3,306) Interest income 3,559 2,231 2,129 Interest expense (75,156) (63,235) (58,196) Defined benefit pension income (expense) 8,938 15,640 7,073 Facility fees and debt-related income (expense) (2,956) (5,506) (1,920) Income (loss) from continuing operations before income taxes and equity income $ (122,958) $ 37,506 $ (54,220)

Revenue Recognition

Revenue Recognition	12 Months Ended
	Dec. 31, 2022
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 includes service revenues from the HE and CE Segments and product revenues from the HE Segment. Revenue from the Rail business 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 is as follows: Year Ended December 31, 2022 (In thousands) Harsco Harsco 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 Harsco 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 Year Ended December 31, 2020 (In thousands) Harsco Environmental Segment Harsco Consolidated Totals Primary Geographical Markets (a) : North America $ 249,904 $ 619,588 $ 869,492 Western Europe 377,066 — 377,066 Latin America (b) 119,457 — 119,457 Asia-Pacific 87,608 — 87,608 Middle East and Africa 63,427 — 63,427 Eastern Europe 16,983 — 16,983 Total Revenues $ 914,445 $ 619,588 $ 1,534,033 Key Product and Service Groups: Environmental services related to resource recovery for metals manufacturing; and related logistical services $ 781,060 $ — $ 781,060 Ecoproducts 120,432 — 120,432 Environmental systems for aluminum dross and scrap processing 12,953 — 12,953 Hazardous waste processing solutions — 472,631 472,631 Soil and dredged materials processing and reuse solutions — 146,957 146,957 Total Revenues $ 914,445 $ 619,588 $ 1,534,033 (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 $5.3 million at December 31, 2022 and $3.1 million at December 31, 2021. 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 $6.8 million at December 31, 2022 and $4.1 million at December 31, 2021. The increase is due principally to receipts of new advances on contracts in excess of the recognition of revenue on previously received advances on contracts during the period. During the year ended December 31, 2022, the Company recognized approximately $18 million of revenue related to amounts previously included in advances on contracts.

Other Expenses

Other Expenses	12 Months Ended
	Dec. 31, 2022
Other Income and Expenses [Abstract]
Other Expenses	Other (Income) Expenses, Net The major components of this Consolidated Statements of Operations caption are as follows: (In thousands) 2022 2021 2020 Net gains Harsco Environmental Segment $ (1,869) $ (8,902) $ (3,723) Harsco Clean Earth (1,512) — — Corporate (632) — — Total net gains (4,013) (8,902) (3,723) Employee termination benefit costs Harsco Environmental Segment 4,998 2,852 9,389 Harsco Clean Earth Segment 1,786 433 833 Corporate (294) 1,481 27 Total employee termination benefit costs 6,490 4,766 10,249 Other costs to exit activities Harsco Environmental Segment 39 640 504 Harsco Clean Earth Segment — 23 — Corporate 1,407 — 29 Total other costs to exit activities 1,446 663 533 Impaired asset write-downs Harsco Environmental Segment 582 942 776 Harsco Clean Earth Segment 59 63 — Total impaired asset write-downs 641 1,005 776 Contingent consideration adjustments Harsco Environmental Segment — — — Harsco Clean Earth Segment (827) — 112 Corporate — — 2,274 Total contingent consideration adjustments (827) — 2,386 Other (income) expense 1,000 (1,254) (149) Total other (income) expenses, net $ 4,737 $ (3,722) $ 10,072 Net Gains Net gains result from the sales of redundant properties (primarily land, buildings and related equipment) and non-core assets. In 2022, gains related to assets sold principally in North America. In 2021, gains related to assets sold principally in Western Europe. In 2020, gains related to assets sold principally in Latin America and 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 2022 principally related to Harsco Environmental Segment primarily in Western Europe; and Harsco Clean Earth Segment primarily in North America. The employee termination benefit costs in 2021 principally related to the Harsco Environmental Segment primarily in Western Europe and Asia-Pacific; and the Harsco Corporate segment primarily in North America. The employee termination benefits costs in 2020 principally related to the Harsco Environmental Segment primarily in Western Europe, North America, Latin America and Asia-Pacific. 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 2022, exit costs were incurred principally in the Harsco Environmental Segment, mostly in Middle East/Africa. In 2021, exit costs were incurred principally in the Harsco Environmental Segment, mostly in North America. In 2020, exit costs were incurred in the Harsco Environmental Segment across several regions. Impaired Asset Write-downs Impaired asset write-downs 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 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 the Harsco Environmental Segment across several regions. Contingent Consideration Adjustments

Components of Accumulated Other

Components of Accumulated Other Comprehensive Loss	12 Months Ended
	Dec. 31, 2022
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Components of Accumulated Other Comprehensive Loss	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, 2022 and 2021 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 Loss on Marketable Securities Total Balance at December 31, 2020 $ (125,392) $ (5,840) $ (514,500) $ (9) $ (645,741) OCI before reclassifications (10,994) (a) 441 (b) 69,517 (c) 31 58,995 Amounts reclassified from AOCI, net of tax — 2,375 22,735 — 25,110 Total OCI (10,994) 2,816 92,252 31 84,105 Less: OCI attributable to noncontrolling interests 1,497 — — — 1,497 OCI attributable to Harsco Corporation (9,497) 2,816 92,252 31 85,602 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 Harsco Corporation (78,215) 3,181 67,549 (12) (7,497) Balance at December 31, 2022 $ (213,104) $ 157 $ (354,699) $ 10 $ (567,636) (a) Principally foreign currency fluctuation. (b) Principally net change from periodic revaluations. (c) Principally changes due to annual actuarial remeasurements and foreign currency translation. Amounts reclassified from AOCI for 2022 and 2021 are as follows: Year Ended December 31 2022 Year Ended December 31 2021 Affected Caption on the (In thousands) Amortization of defined benefit pension items (d) : Actuarial losses $ 17,792 $ 23,657 Defined benefit pension income (expense) Prior-service costs 534 582 Defined benefit pension income (expense) Settlement/curtailment loss (gain) 96 (72) Income (loss) from discontinued businesses Settlement/curtailment gain (33) — Defined benefit pension income (expense) Total before tax 18,389 24,167 Tax benefit (1,218) (1,432) Total reclassification of defined benefit pension items, net of tax $ 17,171 $ 22,735 Amortization of cash flow hedging instruments: Foreign currency exchange forward contracts $ (1,746) $ (129) Income (loss) from discontinued businesses Interest rate swaps 4,245 3,474 Interest expense Total before tax 2,499 3,345 Tax benefit (960) (970) Total reclassification of cash flow hedging instruments $ 1,539 $ 2,375 (d) These AOCI components are included in the computation of NPPC. See Note 10, Employee Benefit Plans, for additional information.

SCHEDULE II. VALUATION AND QUAL

SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS	12 Months Ended
	Dec. 31, 2022
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]
SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS	SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS Continuing Operations (In thousands) COLUMN A COLUMN B COLUMN C COLUMN D COLUMN E Additions (Deductions) Additions (Deductions) Description Balance at Charged to Due to Other Balance at End For the year 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 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 For the year 2020: Allowance for Expected Credit Losses $ 13,265 $ 1,961 $ (104) $ (7,634) (a) $ 7,488 Deferred Tax Assets—Valuation Allowance 100,245 6,936 1,305 77 (b) 108,563 (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. 2021 has been revised from the presentation in the Company's 2021 Form 10-K , which revision did not impact trade accounts receivable, net.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2022
Accounting Policies [Abstract]
Consolidation	ConsolidationThe consolidated financial statements include all accounts of Harsco 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	Reclassifications Certain reclassifications have been made to prior year amounts to conform with current year classifications. During the year ended December 31, 2022, the Company recognized $2.6 million in revenues as an out-of-period adjustment in the CE Segment. Such adjustment was not considered material to the Company's consolidated financial statements for the year ended December 31, 2022 or any of the financial statements for the previously filed annual periods.
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 $3.8 million and $4.2 million at December 31, 2022 and 2021, 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 or unwillingness 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
Depreciation	Depreciation 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.
Goodwill and Other Intangible Assets	Business Combinations and Goodwill The Company accounts for business combinations using the acquisition method of accounting, which requires that. once control is obtained, all assets acquired and liabilities assumed, including amounts attributable to noncontrolling interests, be recorded at their respective fair values at the date of acquisition. The excess of the purchase price over the fair values of identifiable assets and liabilities is recorded as goodwill. The determination of fair value of assets acquired and liabilities assumed requires numerous estimates and assumptions with respect to the timing and amounts of cash flow projections, revenue growth rates, customer attrition rates, discount rates and useful lives. Such estimates are based upon assumptions believed to be reasonable, and, when appropriate, include assistance from independent third-party valuation firms. During the measurement period, which is up to one year from the acquisition date, the Company may record adjustments to the assets acquired and liabilities assumed, with corresponding offsets to 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 or a quantitative test. 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. Note 7, Goodwill and Other Intangible Assets
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 CostsThe 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)
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, 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. Harsco 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. 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. Harsco Rail - This business sells railway track maintenance equipment, after-market parts, Protran/safety equipment and provides railway track maintenance services. • 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 $$50 million was recognized using the cost-to-cost method in 2022, the net profit or loss of which is included in Income (loss) from discontinued businesses in the 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.
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 2022, 2021 and 2020, the Company recorded insurance reserve adjustments that decreased pre-tax insurance expense from continuing operations for self-insured programs by $1.0 million, $0.2 million and $1.3 million, respectively. At December 31, 2022 and 2021, the Company has recorded liabilities of $32.4 million and $28.3 million, respectively, related to both asserted as well as unasserted insurance claims. Included in the balances at December 31, 2022 and 2021 were $4.0 million and $4.1 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 Consolidated Balance Sheets.
Foreign Currency Translation	Foreign Currency TranslationThe financial statements of the Company's subsidiaries outside the U.S., except for those subsidiaries located 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, 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 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 currently in operations.
Earnings Per Share	Earnings Per ShareBasic 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 2022: On January 1, 2022, the Company adopted changes issued by the FASB which improved the transparency of government assistance received by entities. The adoption of these changes did not have a material impact on the Company's consolidated financial statements. As of December 31, 2022, the Company adopted changes issued by the FASB which provided companies with optional guidance to ease the potential accounting burden associated with transitioning from reference rates that are expected to be discontinued, particularly the cessation of LIBOR. The adoption of these changes did not have a material impact on the Company's consolidated financial statements. The following accounting standards have been issued and become effective for the Company at a future date: In October 2021, the FASB issued changes clarifying 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. Prior guidance required acquired contract assets and contract liabilities to be measured at fair value on the acquisition date. The changes become effective January 1, 2023. The adoption of these changes does not have an immediate impact on the Company's consolidated financial statements, but will be applied prospectively to any future business combinations. In September 2022, the FASB issued changes 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 changes become effective January 1, 2023, generally with retrospective application to each period in which a balance sheet is presented. Other than potential required expanded disclosures, the adoption of these changes will not have a material impact on the Company's consolidated financial statements.

Discontinued Operations (Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2022
Business Combinations [Abstract]
Disposal Groups, Including Discontinued Operations	The former Harsco Rail Segment's balance sheet positions as of December 31, 2022 and 2021 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 December 31 Trade accounts receivable, net $ 41,049 $ 33,689 Other receivables 4,037 4,740 Inventories 105,256 103,560 Current portion of contract assets 84,848 94,597 Other current assets 30,950 25,442 Property, plant and equipment, net 41,004 39,524 Right-of-use assets, net 5,635 3,108 Goodwill 13,026 13,026 Intangible assets, net 2,746 3,081 Deferred income tax assets 6,887 6,064 Other assets 807 6,432 Total Rail assets included in Assets held-for-sale $ 336,245 $ 333,263 Accounts payable $ 49,083 $ 46,076 Accrued compensation 1,211 2,171 Current portion of operating lease liabilities 2,635 1,619 Current portion of advances on contracts 45,037 62,401 Other current liabilities 61,039 49,732 Operating lease liabilities 3,121 1,775 Deferred tax liabilities 5,480 5,736 Other liabilities 861 981 Total Rail liabilities included in Liabilities of assets held-for-sale $ 168,467 $ 170,491 Years Ended December 31 (In thousands) 2022 2021 2020 Amounts directly attributable to the former Harsco Rail Segment: Service revenues $ 29,331 $ 32,425 $ 31,642 Product revenues (a) 215,585 266,221 298,189 Cost of services sold 21,034 17,272 23,480 Cost of products sold 225,769 251,897 235,040 Income (loss) from discontinued businesses (40,898) (19,967) 23,096 Additional amounts allocated to the former Harsco Rail Segment: Selling, general and administrative expenses (b) $ 4,039 $ 178 $ — (a) The decrease in product revenues for 2022, as compared to 2021 and 2020, 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 The following is selected financial information included on the Consolidated Statements of Cash Flows attributable to the Rail Segment: Years Ended December 31 (In thousands) 2022 2021 2020 Non-cash operating items Depreciation and amortization $ — $ 4,329 $ 5,450 Cash flows from investing activities Purchases of property, plant and equipment 1,618 1,406 7,962

Accounts Receivable and Note _2

Accounts Receivable and Note Receivable (Tables)	12 Months Ended
	Dec. 31, 2022
Receivables [Abstract]
Schedule of accounts receivable	Accounts receivable consist of the following: (In thousands) December 31 December 31 2021 (a) Trade accounts receivable $ 272,775 $ 389,535 Less: Allowance for expected credit losses (b) (8,347) (11,654) Trade accounts receivable, net $ 264,428 $ 377,881 Other receivables (c) $ 25,379 $ 33,059 (a) The December 31, 2021 amounts for trade accounts receivable and allowance for expected credit losses have been revised from the presentation in the Company's 2021 Form 10-K. This revision did not impact trade accounts receivable, net. (b) The decrease in the allowance for expected credit losses is principally due to the write-off of previously reserved trade accounts receivable balances. (c) 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 from operating activities in the Consolidated Statements of Cash Flows: Year Ended December 31 (In millions) 2022 Upon execution in June 2022 $ 120.0 Additional proceeds 25.0 Total received $ 145.0 (In millions) December 31 December 31 Net amounts sold under factoring arrangements $ 17.3 $ 12.9 Program capacities 31.4 16.5 (In millions) December 31 December 31 Note receivable, at amortized cost $ 23.9 $ 31.0 Note receivable, at fair value $ 23.8 $ 32.3
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) 2022 2021 2020 Provision for expected credit losses related to trade accounts receivable $ 403 $ 589 $ 1,961

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2022
Inventory Disclosure [Abstract]
Schedule of inventories	Inventories consist of the following: (In thousands) December 31 December 31 Finished goods $ 11,809 $ 8,323 Work-in-process 4,241 5,393 Raw materials and purchased parts 25,735 21,188 Stores and supplies 39,590 35,589 Total inventories $ 81,375 $ 70,493 Valued at lower of cost or market: LIFO basis $ 15,473 $ 14,133 FIFO basis 8,826 7,567 Average cost basis 57,076 48,793 Total inventories $ 81,375 $ 70,493

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2022
Property, Plant and Equipment [Abstract]
Schedule of property, plant and equipment	Property, plant and equipment consist of the following: (In thousands) Estimated December 31 December 31 Land — $ 72,020 $ 73,067 Land improvements 5-20 years 16,750 16,970 Buildings and improvements (a) 10-30 years 217,926 221,236 Machinery and equipment (b) 3-20 years 1,513,238 1,507,214 Uncompleted construction — 84,472 63,816 Gross property, plant and equipment 1,904,406 1,882,303 Less: Accumulated depreciation (1,247,531) (1,228,390) Property, plant and equipment, net $ 656,875 $ 653,913

Goodwill and Other Intangible_2

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table reflects the changes in carrying amounts of goodwill by segment for the years ended December 31, 2022 and 2021: (In thousands) Harsco Environmental Harsco Consolidated Balance at December 31, 2020 $ 406,401 $ 482,647 $ 889,048 Changes to goodwill — 1,232 1,232 Foreign currency translation (7,171) — (7,171) 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
Schedule of Acquired Finite-Lived Intangible Assets by Major Class	The following table reflects these intangible assets by major category: December 31, 2022 December 31, 2021 (In thousands) Gross Carrying Accumulated Gross Carrying Accumulated Customer related $ 95,573 $ 54,482 $ 104,322 $ 54,057 Permits 309,177 50,703 309,069 34,822 Technology related 20,800 15,491 39,886 13,415 Trade names 30,212 9,198 30,738 6,842 Air rights 26,139 2,411 26,139 1,675 Patents 189 155 179 138 Non-compete agreement 2,500 1,718 2,500 1,094 Other 3,147 1,419 3,407 1,396 Total $ 487,737 $ 135,577 $ 516,240 $ 113,439
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) 2023 2024 2025 2026 2027 Estimated amortization expense (b) $ 28,200 $ 27,700 $ 27,500 $ 25,700 $ 24,400 (b) These estimated amortization expense amounts do not reflect the potential effect of future foreign currency exchange rate fluctuations.

Debt and Credit Agreements (Tab

Debt and Credit Agreements (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022. December 31, 2022 (In thousands) Facility Outstanding Outstanding Letters of Credit Available Revolving Credit Facility $ 700,000 $ 370,000 $ 27,318 $ 302,682
Schedule of Long-term Debt Instruments	The Company's long-term debt consists of the following: (In thousands) December 31 December 31 Senior Secured Credit Facilities (a) : New Term Loan with an interest rate of 6.69% and 2.75% at December 31, 2022 and 2021, respectively $ 492,500 $ 497,500 Revolving Credit Facility with an average interest rate of 7.19% and 2.45% at December 31, 2022 and 2021, respectively 370,000 362,000 5.75% Senior Notes 475,000 500,000 Other financing payable (including capital leases) in varying amounts due principally through 2026 with a weighted-average interest rate of 5.00% and 4.73% at December 31, 2022 and 2021, respectively 26,661 28,389 Total debt obligations 1,364,161 1,387,889 Less: deferred financing costs (15,172) (18,217) Total debt obligations, net of deferred financing costs 1,348,989 1,369,672 Less: current maturities of long-term debt (11,994) (10,226) Long-term debt $ 1,336,995 $ 1,359,446 (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, 2022 and 2021.
Schedule of Maturities of Long-term Debt	The maturities of long-term debt for the four years following December 31, 2023 are as follows: (In thousands) 2024 $ 11,293 2025 9,635 2026 378,542 2027 481,983
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) 2022 2021 2020 Gain (loss) on extinguishment of debt $ 2,254 $ (2,668) $ — Unused debt commitment and amendment fees (1,696) (2,838) (1,920) Securitization and factoring fees (3,514) — — Facility fees and debt-related income (expense) $ (2,956) $ (5,506) $ (1,920)

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2022
Leases [Abstract]
Lease, Cost [Table Text Block]	The components of lease expense were as follows: (In thousands) 2022 2021 2020 Finance leases: Amortization expense $ 3,938 $ 2,510 $ 1,523 Interest on lease liabilities 784 495 184 Operating leases 33,773 32,544 28,537 Variable and short-term leases 49,811 47,780 40,953 Sublease income (6) (53) (202) Total lease expense from continuing operations $ 88,300 $ 83,276 $ 70,995 Supplemental cash flow information related to leases was as follows: (In thousands) 2022 2021 2020 Cash paid for amounts included in the measurement of lease liabilities: Cash flows used by operating activities - Operating leases (a) $ 34,420 $ 33,645 $ 28,057 Cash flows used by operating activities - Finance leases 798 517 184 Cash flows used by financing activities - Finance leases 3,975 2,330 1,183 ROU assets obtained in exchange for lease obligations: Operating leases (b) $ 32,817 $ 42,442 $ 69,044 Finance leases 11,175 11,495 6,220 (a) Cash flows include cash paid for operating leases of discontinued operations. (b) Cash flows include ROU assets of approximately $56 million that were recorded upon the acquisition of ESOL in 2020. Supplemental balance sheet information related to leases was as follows: (In thousands) 2022 2021 Operating Leases (c): Operating lease ROU assets $ 101,253 $ 101,576 Current portion of operating lease liabilities 25,521 25,590 Operating lease liabilities 75,246 74,571 Finance Leases: Property, plant and equipment, net $ 23,671 $ 17,185 Current maturities of long-term debt 5,562 3,756 Long-term debt 18,832 13,736 (c) The 2021 operating lease ROU assets and operating lease liabilities include a $15 million adjustment to record certain leases for ESOL. These leases have been incorrectly treated as short term leases versus operating leases since ESOL's acquisition on April 6, 2020. Supplemental additional information related to leases was as follows: 2022 2021 Other information: Weighted average remaining lease term - Operating leases (in years) 7.42 7.14 Weighted average remaining lease term - Finance leases (in years) 5.35 5.88 Weighted average discount rate - Operating leases 6.0 % 5.9 % Weighted average discount rate - Finance leases 5.2 % 4.6 %
Schedule of Future Minimum Rental Payments for Operating Leases
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	Maturities of lease liabilities were as follows: (In thousands) Operating Leases Finance Year Ending December 31: 2023 $ 30,274 $ 6,663 2024 24,099 6,284 2025 17,928 5,237 2026 13,416 3,923 2027 8,545 2,240 After 2027 34,233 3,868 Total lease payments 128,495 28,215 Less: Imputed interest (27,728) (3,821) Total lease liabilities $ 100,767 $ 24,394
Finance Lease, Liability, Maturity [Table Text Block]	Maturities of lease liabilities were as follows: (In thousands) Operating Leases Finance Year Ending December 31: 2023 $ 30,274 $ 6,663 2024 24,099 6,284 2025 17,928 5,237 2026 13,416 3,923 2027 8,545 2,240 After 2027 34,233 3,868 Total lease payments 128,495 28,215 Less: Imputed interest (27,728) (3,821) Total lease liabilities $ 100,767 $ 24,394

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2022
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 2022, 2021 and 2020 is as follows: U.S. Plans International Plans (In thousands) 2022 2021 2020 2022 2021 2020 Net Periodic Pension Cost (Income): Defined benefit pension plans: Service cost $ — $ — $ — $ 1,867 $ 1,805 $ 1,642 Interest cost 5,716 4,813 7,381 16,500 12,652 17,599 Expected return on plan assets (10,795) (12,199) (11,368) (38,891) (45,018) (41,013) Recognized prior service costs — — — 534 582 512 Recognized losses 4,732 5,538 5,100 13,060 18,119 14,723 Settlement/curtailment loss (gain) — — — (33) (6) 18 Defined benefit pension plan cost (income) (347) (1,848) 1,113 (6,963) (11,866) (6,519) U.S. Plans International Plans (In thousands) 2022 2021 2020 2022 2021 2020 Multiemployer pension plans 642 640 620 1,114 1,035 969 Defined contribution plans 5,401 5,660 4,769 4,122 4,196 3,994 Net periodic pension cost (income) $ 5,696 $ 4,452 $ 6,502 $ (1,727) $ (6,635) $ (1,556)
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, 2022 and 2021 are as follows: U.S. Plans International Plans (In thousands) 2022 2021 2022 2021 Change in benefit obligation: Benefit obligation at beginning of year $ 277,007 $ 296,660 $ 1,022,198 $ 1,119,552 Service cost — — 1,867 1,805 Interest cost 5,716 4,813 16,500 12,652 Plan participants' contributions — — 14 15 Actuarial (gain) loss (57,841) (8,063) (299,841) (58,567) Settlements/curtailments — — (132) (269) Benefits paid (15,700) (16,403) (37,135) (39,831) Effect of foreign currency — — (106,281) (13,159) Benefit obligation at end of year $ 209,182 $ 277,007 $ 597,190 $ 1,022,198 Change in plan assets: Fair value of plan assets at beginning of year $ 232,947 $ 226,125 $ 973,252 $ 957,177 Actual return on plan assets (41,909) 19,005 (250,002) 40,382 Employer contributions 1,706 4,219 22,614 25,077 Plan participants' contributions — — 14 15 Settlements/curtailments — — (132) (269) Benefits paid (15,700) (16,402) (37,135) (39,220) Effect of foreign currency — — (101,377) (9,910) Fair value of plan assets at end of year $ 177,044 $ 232,947 $ 607,234 $ 973,252 Funded status at end of year $ (32,138) $ (44,060) $ 10,044 $ (48,946)
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, 2022 and 2021: U.S. Plans International Plans December 31 December 31 (In thousands) 2022 2021 2022 2021 Noncurrent assets $ — $ — $ 26,033 $ 2,046 Current liabilities 1,851 1,999 924 967 Noncurrent liabilities 30,287 42,061 15,065 50,025 AOCI 105,005 114,874 346,068 410,114
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, 2022 and 2021: U.S. Plans International Plans (In thousands) 2022 2021 2022 2021 Net actuarial loss $ 105,005 $ 114,874 $ 337,849 $ 400,497 Prior service cost — — 8,219 9,617 Total $ 105,005 $ 114,874 $ 346,068 $ 410,114
Schedule of Expected Benefit Payments	Expected benefit payments for defined benefit pension plans over the next ten years are as follows: (In millions) 2023 2024 2025 2026 2027 2028-2032 U.S. Plans $ 26.3 $ 16.4 $ 16.4 $ 16.2 $ 16.1 $ 76.6 International Plans 38.1 38.8 40.2 41.3 42.7 225.4
Schedule of Assumptions Used	The weighted-average actuarial assumptions used to determine the defined benefit pension plan NPPC for 2022, 2021 and 2020 were as follows: U.S. Plans International Plans Global Weighted-Average 2022 2021 2020 2022 2021 2020 2022 2021 2020 Discount rates 2.7 % 2.4 % 3.2 % 1.9 % 1.4 % 2.1 % 2.1 % 1.6 % 2.4 % Expected long-term rates of return on plan assets 6.3 % 6.8 % 7.0 % 4.4 % 4.7 % 5.2 % 4.7 % 5.1 % 5.6 % The weighted-average actuarial assumptions used to determine the defined benefit pension plan obligations at December 31, 2022 and 2021 were as follows: U.S. Plans International Plans Global Weighted-Average December 31 December 31 December 31 2022 2021 2022 2021 2022 2021 Discount rates 5.3 % 2.7 % 5.1 % 1.9 % 5.1 % 2.1 %
Schedule of Accumulated Benefit Obligations	The accumulated benefit obligation for all defined benefit pension plans at December 31, 2022 and 2021 was as follows: U.S. Plans International Plans December 31 December 31 (In millions) 2022 2021 2022 2021 Accumulated benefit obligation $ 209.2 $ 277.0 $ 593.4 $ 1,016.1
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, 2022 and 2021 were as follows: U.S. Plans International Plans December 31 December 31 (In millions) 2022 2021 2022 2021 Projected benefit obligation $ 209.2 $ 277.0 $ 25.3 $ 988.6 Accumulated benefit obligation 209.2 277.0 22.6 984.7 Fair value of plan assets 177.0 232.9 9.4 939.3
Schedule of Allocation of Plan Assets	The asset allocations attributable to the Company's international defined benefit pension plans at December 31, 2022 and 2021 and the long-term target allocation of plan assets, by asset category, are as follows: International Plans Asset Category Target Long-Term Percentage of Plan Assets 2022 2021 Equity securities 26.5 % 24.8 % 27.9 % Fixed income securities 65.5 % 65.5 % 63.6 % Cash and cash equivalents — 1.5 % 0.7 % Other (b) 8.0 % 8.2 % 7.8 %
U.S. Plans | Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Schedule of Allocation of Plan Assets	The asset allocations attributable to the Company's U.S. defined benefit pension plans at December 31, 2022 and 2021, and the long-term target allocation of plan assets, by asset category, are as follows: Target Long-Term Percentage of Plan Assets U.S. Plans Asset Category 2022 2021 Domestic equity securities 18%-28% 21.0 % 22.8 % International equity securities 17%-27% 22.2 % 22.5 % Fixed income securities 41%-51% 44.6 % 45.9 % Cash and cash equivalents Less than 5% 1.0 % — % Other (a) 4%-14% 11.2 % 8.8 % (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, 2022 by asset class are as follows: (In thousands) Total Level 1 Investments Valued at Net Asset Value (c) 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 U.S. defined benefit pension plans' assets at December 31, 2021 by asset class are as follows: (In thousands) Total Level 1 Investments Valued at Net Asset Value Domestic equities: Common stocks $ 5,180 $ 5,180 $ — Mutual funds—equities 48,411 48,411 — International equities: Mutual funds—equities 50,783 50,783 — Fixed income investments: Mutual funds—bonds 105,114 105,114 — Other—mutual funds 9,371 9,371 — Cash and money market accounts 1,624 1,624 — Other - partnerships/joint ventures 12,464 — 12,464 Total $ 232,947 $ 220,483 $ 12,464
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, 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 fair values of the Company's international defined benefit pension plans' assets at December 31, 2021 by asset class are as follows: (In thousands) Total Level 1 Level 2 Equity securities: Mutual funds—equities $ 271,811 $ — $ 271,811 Fixed income investments: Mutual funds—bonds 613,243 — 613,243 Insurance contracts 5,684 — 5,684 Other: Other mutual funds 75,651 — 75,651 Cash and money market accounts 6,863 6,863 — Total $ 973,252 $ 6,863 $ 966,389

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2022
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) 2022 2021 2020 U.S. $ (152,602) $ (34,462) $ (87,315) International 29,644 71,968 33,095 Total income (loss) from continuing operations before income taxes and equity income $ (122,958) $ 37,506 $ (54,220)
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) 2022 2021 2020 Income tax expense (benefit): Currently payable: U.S. federal $ — $ — $ (12,116) U.S. state 1,416 507 468 International 14,914 22,295 16,518 Total income taxes currently payable 16,330 22,802 4,870 Deferred U.S. federal (6,219) (4,594) (10,558) Deferred U.S. state (2,274) (18) (3,078) Deferred international 2,544 (9,101) 93 Total income tax expense (benefit) from continuing operations $ 10,381 $ 9,089 $ (8,673)
Schedule of Effective Income Tax Rate Reconciliation	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) 2022 2021 2020 U.S. federal income tax expense (benefit), at statutory tax rate of 21% $ (25,821) $ 7,877 $ (11,386) U.S. state income taxes, net of federal income tax benefit (929) (310) (2,015) U.S. other domestic deductions and credits (594) (415) (1,312) Difference in effective tax rates on international earnings and remittances 8,929 4,488 7,872 Uncertain tax position contingencies and settlements (290) 783 289 Changes in realization of deferred tax assets 8,263 (5,035) (1,501) U.S. non-deductible expenses 791 936 2,300 Nondeductible goodwill impairment 19,548 — — State deferred tax rate changes 154 592 (40) Foreign derived intangible income deduction (938) — — Share-based compensation 1,268 173 (184) Net operating loss carryback — — (2,696) Total income tax expense (benefit) from continuing operations $ 10,381 $ 9,089 $ (8,673)
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, 2022 and 2021 are as follows: 2022 (a) 2021 (a) (In thousands) Asset Liability Asset Liability Depreciation and amortization $ — $ 61,145 $ — $ 80,278 Right-of-use assets — 24,826 — 25,130 Operating lease liabilities 25,024 — 24,802 — Expense accruals 28,758 — 24,949 — Inventories 4,011 — 3,400 — Provision for receivables 2,781 — 3,997 — Deferred revenue 4,484 — — 2,750 Operating loss carryforwards 54,237 — 67,442 — Tax credit carryforwards 21,443 — 18,608 — Pensions 5,171 — 23,298 — Currency adjustments — 3,330 3,701 — Section 163(j) disallowed interest expense 13,869 — 4,843 — Research and development 2,795 — — — Stock based compensation 6,580 — 7,396 — Other — 3,198 2,164 — Subtotal 169,153 92,499 184,600 108,158 Valuation allowance (89,234) — (92,385) — Total deferred income taxes $ 79,919 $ 92,499 $ 92,215 $ 108,158 (a) Does not include approximately $1.0 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.
Summary of Income Tax Contingencies	A reconciliation of the change in the unrecognized income tax benefits balance from January 1, 2020 to December 31, 2022 is as follows: (In thousands) Unrecognized Deferred Unrecognized Balances, January 1, 2020 $ 3,129 $ (22) $ 3,107 Additions for tax positions related to the current year (includes currency translation adjustment) 596 (2) 594 Other reductions for tax positions related to prior years (771) — (771) Statutes of limitation expirations (58) 2 (56) Balance at December 31, 2020 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) Total unrecognized income tax benefits that, if recognized, would impact the effective income tax rate at December 31, 2022 $ 2,792 $ (21) $ 2,771
Tax Years Subjected to Examniation	The tax years that remain subject to examination for the Company's major tax jurisdictions as of December 31, 2022 are shown below: Jurisdiction Earliest Open Year Brazil 2018 China 2017 France 2020 United States: Federal income tax 2014 State income tax 2016

Commitment and Contingencies (T

Commitment and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2022
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 December 31 Current portion of environmental liabilities (a) $ 7,120 $ 7,338 Long-term environmental liabilities 26,880 28,435 Total environmental liabilities $ 34,000 $ 35,773 (a) The current portion of environmental liabilities is included in the caption Other current liabilities on the Consolidated Balance Sheets.

Capital Stock (Tables)

Capital Stock (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2020 to December 31, 2022: Shares Treasury Outstanding Outstanding, January 1, 2020 114,720,347 36,205,589 78,514,758 Shares issued for vested restricted stock units 229,413 91,188 138,225 Shares issued for vested performance stock units 471,412 206,261 265,151 Stock appreciation rights exercised 8,870 2,634 6,236 Outstanding, December 31, 2020 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
Schedule of Earnings Per Share, Basic and Diluted	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) 2022 2021 2020 Income (loss) from continuing operations attributable to Harsco Corporation common stockholders $ (137,155) $ 22,137 $ (49,727) Weighted-average shares outstanding—basic 79,493 79,234 78,939 Dilutive effect of stock-based compensation — 1,055 — Weighted-average shares outstanding—diluted 79,493 80,289 78,939 Income (loss) from continuing operations per common share, attributable to Harsco Corporation common stockholders: Basic $ (1.73) $ 0.28 $ (0.63) Diluted $ (1.73) $ 0.28 $ (0.63)
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	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) 2022 2021 2020 Restricted stock units 672 — 714 Stock appreciation rights 2,092 826 2,474 Performance share units 1,040 865 887

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022, 2021, and 2020: RSUs (a) Weighted Average Fair Value Expense (Dollars in thousands, except per unit) 2022 2021 2020 Directors: 2019 14,211 25.33 $ — $ — $ 120 2020 34,986 10.29 — 120 240 2021 23,224 21.53 167 333 — 2022 63,696 7.85 333 — — Employees: 2017 286,251 13.70 — — 85 2018 242,791 19.93 — 142 706 2019 270,864 22.25 314 1,239 1,270 2020 522,087 8.22 741 1,093 1,244 2021 343,125 18.62 1,294 1,892 — 2022 450,915 12.36 1,486 — — Total $ 4,335 $ 4,819 $ 3,665 (a) Represents number of awards originally issued.
Schedule of restricted stock unit activity	RSU activity for the year ended December 31, 2022 was as follows: Number of Shares Weighted Average Non-vested at December 31, 2021 712,844 $ 14.68 Granted 514,611 11.80 Vested (342,907) 14.87 Forfeited (212,964) 14.28 Non-vested at December 31, 2022 671,584 $ 12.51
Schedule of Stock Appreciation Rights award activity	SARs activity for the year ended December 31, 2022 was as follows: Number of Shares Weighted Average Exercise Price Aggregate Intrinsic Value (in millions) (b) Outstanding, December 31, 2021 2,394,055 $ 14.75 $ 8.6 Granted 342,987 12.02 Exercised (118,618) 7.97 Forfeited/Expired (526,562) 14.78 Outstanding, December 31, 2022 2,091,862 $ 14.68 0.0
Schedule of nonvested awards activity	The following table summarizes information concerning outstanding and exercisable SARs at December 31, 2022: 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 - $13.70 777,700 383,485 $ 10.15 6.18 777,700 $ 9.67 $16.53 - $22.70 650,634 86,986 19.16 4.23 650,634 19.24 $23.25 - $26.92 193,057 — 24.79 1.62 193,057 24.79 1,621,391 470,471 $ 14.68 5.07 1,621,391 $ 15.31
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of stock appreciation rights valuation assumptions	The fair value of each SAR grant was estimated on the grant date using a Black-Scholes pricing model with the following assumptions: Risk-free Interest Rate Dividend Yield Expected Life (Years) Volatility SAR Grant Price Fair Value of SAR March 2020 Grant 0.76 % — % 6.0 45.2 % $ 10.29 $ 3.03 October 2020 Grant 0.44 % — % 6.0 60.3 % 14.89 8.12 March 2021 Grant 0.91 % — % 6.0 61.9 % 18.58 10.48 March 2022 Grant 1.67 % — % 6.0 60.3 % 12.65 7.20 September 2022 Grant 3.56 % — % 6.0 60.6 % 5.02 2.97 October 2022 Grant 4.10 % — % 6.0 61.3 % 5.26 3.17 December 2022 Grant 3.75 % — % 6.0 62.4 % 6.15 3.72
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, 2022 was as follows: Number of Shares Weighted-Average Grant Date Fair Value Non-vested shares, December 31, 2021 664,880 $ 5.63 Granted 342,987 6.86 Vested (322,368) 5.54 Forfeited (215,028) 6.57 Non-vested shares, December 31, 2022 470,471 $ 6.16
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of stock appreciation rights valuation assumptions	The fair value of PSUs granted was estimated on the grant date using a Monte Carlo pricing model with the following assumptions: Risk-free Interest rate Dividend Yield Expected Life (Years) Volatility Fair Value of PSU March 2020 Grant 0.56 % — % 2.81 36.0 % $ 4.40 October 2020 Grant 0.17 % — % 2.20 53.7 % 17.01 March 2021 Grant 0.25 % — % 2.83 50.7 % 25.38 March 2022 Grant 1.59 % — % 2.83 50.4 % 16.54
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, 2022 was as follows: Number of Shares Weighted-Average Grant Date Fair Value Non-vested shares, December 31, 2021 753,793 $ 13.05 Granted 500,624 16.54 Forfeited (213,999) 14.51 Vested, not issued (c) (378,466) 4.80 Non-vested shares, December 31, 2022 661,952 $ 19.94 (c) The measurement period for PSUs issued in 2020 ended on December 31, 2022 and these shares vested but will not be issued until the Board certifies the measurement period results in early 2023. A total of 0 shares are expected to be issued.

Financial Instruments (Tables)

Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2022
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, 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 December 31, 2021 Asset derivatives (Level 2): Foreign currency exchange forward contracts Other current assets $ 719 $ 1,405 $ 2,124 Total $ 719 $ 1,405 $ 2,124 Liability derivatives (Level 2): Foreign currency exchange forward contracts Other current liabilities $ 560 $ 2,905 $ 3,465 Interest rate swaps Other current liabilities 4,157 — 4,157 Total $ 4,717 $ 2,905 $ 7,622
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 Amount Reclassified from (In thousands) 2022 2021 2020 2022 2021 2020 Foreign currency exchange forward contracts $ 1,966 $ 309 $ (930) $ (1,746) $ (129) $ (1,026) Interest rate swaps — (42) (3,889) 4,245 3,474 2,589 CCIRs (a) — — 39 — — 1,015 $ 1,966 $ 267 $ (4,780) $ 2,499 $ 3,345 $ 2,578 (a) Amounts represent changes in foreign currency translation related to balances in AOCI.
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	The location and amount of gain (loss) recognized on the Consolidated Statements of Operations: 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 (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 $ (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 2020 (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 $ (58,196) $ 20,350 Interest rate swaps: Gain or (loss) reclassified from AOCI into income (2,589) — Foreign exchange contracts: Gain or (loss) reclassified from AOCI into income — 1,026 CCIRs: Gain or (loss) reclassified from AOCI into income (1,015) —
Derivatives Not Designated as Hedging Instruments	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) 2022 2021 2020 Foreign currency exchange forward contracts Cost of sales $ 19,808 $ 10,761 $ (9,052) (a) These gains (losses) offset amounts recognized in cost of sales sold principally as a result of intercompany or third-party foreign currency exposures.

Information by Segment and Ge_2

Information by Segment and Geographic Area (Tables)	12 Months Ended
	Dec. 31, 2022
Segment Reporting [Abstract]
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas	Countries with revenues from unaffiliated customers or net property, plant and equipment 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) 2022 2021 2020 U.S. $ 1,075,355 $ 1,008,689 $ 830,699 All Other 813,710 839,710 703,334 Totals including Corporate $ 1,889,065 $ 1,848,399 $ 1,534,033 (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) 2022 2021 U.S. $ 283,864 $ 267,174 China 96,095 108,496 All Other 276,916 278,243 Totals including Corporate $ 656,875 $ 653,913
Schedule of Segment Operating Information by Segment	Operating Information by Segment: Years ended December 31 (In thousands) 2022 2021 2020 Revenues Harsco Environmental $ 1,061,239 $ 1,068,083 $ 914,445 Harsco Clean Earth 827,826 780,316 619,588 Total Revenues $ 1,889,065 $ 1,848,399 $ 1,534,033 Operating Income (Loss) Harsco Environmental $ 59,559 $ 103,402 $ 59,006 Harsco Clean Earth (81,785) 25,639 16,096 Corporate (35,117) (40,665) (78,408) Total Operating Income (Loss) $ (57,343) $ 88,376 $ (3,306) Total Assets Harsco Environmental $ 1,416,717 $ 1,386,087 $ 1,322,731 Harsco Clean Earth 980,774 1,278,472 1,279,387 Corporate 57,118 56,086 74,185 Discontinued Operations 336,245 333,263 316,984 Total Assets $ 2,790,854 $ 3,053,908 $ 2,993,287 Depreciation Harsco Environmental $ 108,880 $ 105,830 $ 100,971 Harsco Clean Earth 18,836 19,672 17,450 Corporate 1,996 1,900 2,022 Total Depreciation $ 129,712 $ 127,402 $ 120,443 Amortization Harsco Environmental $ 6,809 $ 8,052 $ 7,825 Harsco Clean Earth 24,299 24,180 22,814 Corporate (b) 3,029 2,710 2,961 Total Amortization $ 34,137 $ 34,942 $ 33,600 Capital Expenditures Harsco Environmental $ 109,508 $ 137,228 $ 99,056 Harsco Clean Earth 21,996 18,403 12,612 Corporate 4,038 1,289 488 Total Capital Expenditures $ 135,542 $ 156,920 $ 112,156 (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) 2022 2021 2020 Segment operating income (loss) $ (22,226) $ 129,041 $ 75,102 General Corporate expense (35,117) (40,665) (78,408) Operating income (loss) from continuing operations (57,343) 88,376 (3,306) Interest income 3,559 2,231 2,129 Interest expense (75,156) (63,235) (58,196) Defined benefit pension income (expense) 8,938 15,640 7,073 Facility fees and debt-related income (expense) (2,956) (5,506) (1,920) Income (loss) from continuing operations before income taxes and equity income $ (122,958) $ 37,506 $ (54,220)

Revenue Recognition (Tables)

Revenue Recognition (Tables)	12 Months Ended
	Dec. 31, 2022
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 is as follows: Year Ended December 31, 2022 (In thousands) Harsco Harsco 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 Harsco 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 Year Ended December 31, 2020 (In thousands) Harsco Environmental Segment Harsco Consolidated Totals Primary Geographical Markets (a) : North America $ 249,904 $ 619,588 $ 869,492 Western Europe 377,066 — 377,066 Latin America (b) 119,457 — 119,457 Asia-Pacific 87,608 — 87,608 Middle East and Africa 63,427 — 63,427 Eastern Europe 16,983 — 16,983 Total Revenues $ 914,445 $ 619,588 $ 1,534,033 Key Product and Service Groups: Environmental services related to resource recovery for metals manufacturing; and related logistical services $ 781,060 $ — $ 781,060 Ecoproducts 120,432 — 120,432 Environmental systems for aluminum dross and scrap processing 12,953 — 12,953 Hazardous waste processing solutions — 472,631 472,631 Soil and dredged materials processing and reuse solutions — 146,957 146,957 Total Revenues $ 914,445 $ 619,588 $ 1,534,033 (a) Revenues are attributed to individual countries based on the location of the facility generating the revenue. (b) Includes Mexico.

Other Expenses (Tables)

Other Expenses (Tables)	12 Months Ended
	Dec. 31, 2022
Other Income and Expenses [Abstract]
Schedule of other expenses (income)	The major components of this Consolidated Statements of Operations caption are as follows: (In thousands) 2022 2021 2020 Net gains Harsco Environmental Segment $ (1,869) $ (8,902) $ (3,723) Harsco Clean Earth (1,512) — — Corporate (632) — — Total net gains (4,013) (8,902) (3,723) Employee termination benefit costs Harsco Environmental Segment 4,998 2,852 9,389 Harsco Clean Earth Segment 1,786 433 833 Corporate (294) 1,481 27 Total employee termination benefit costs 6,490 4,766 10,249 Other costs to exit activities Harsco Environmental Segment 39 640 504 Harsco Clean Earth Segment — 23 — Corporate 1,407 — 29 Total other costs to exit activities 1,446 663 533 Impaired asset write-downs Harsco Environmental Segment 582 942 776 Harsco Clean Earth Segment 59 63 — Total impaired asset write-downs 641 1,005 776 Contingent consideration adjustments Harsco Environmental Segment — — — Harsco Clean Earth Segment (827) — 112 Corporate — — 2,274 Total contingent consideration adjustments (827) — 2,386 Other (income) expense 1,000 (1,254) (149) Total other (income) expenses, net $ 4,737 $ (3,722) $ 10,072

Components of Accumulated Oth_2

Components of Accumulated Other Comprehensive Loss (Tables)	12 Months Ended
	Dec. 31, 2022
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, 2022 and 2021 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 Loss on Marketable Securities Total Balance at December 31, 2020 $ (125,392) $ (5,840) $ (514,500) $ (9) $ (645,741) OCI before reclassifications (10,994) (a) 441 (b) 69,517 (c) 31 58,995 Amounts reclassified from AOCI, net of tax — 2,375 22,735 — 25,110 Total OCI (10,994) 2,816 92,252 31 84,105 Less: OCI attributable to noncontrolling interests 1,497 — — — 1,497 OCI attributable to Harsco Corporation (9,497) 2,816 92,252 31 85,602 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 Harsco Corporation (78,215) 3,181 67,549 (12) (7,497) Balance at December 31, 2022 $ (213,104) $ 157 $ (354,699) $ 10 $ (567,636) (a) Principally foreign currency fluctuation. (b) Principally net change from periodic revaluations. (c) Principally changes due to annual actuarial remeasurements and foreign currency translation.
Amounts reclassified out of accumulated other comprehensive loss	Amounts reclassified from AOCI for 2022 and 2021 are as follows: Year Ended December 31 2022 Year Ended December 31 2021 Affected Caption on the (In thousands) Amortization of defined benefit pension items (d) : Actuarial losses $ 17,792 $ 23,657 Defined benefit pension income (expense) Prior-service costs 534 582 Defined benefit pension income (expense) Settlement/curtailment loss (gain) 96 (72) Income (loss) from discontinued businesses Settlement/curtailment gain (33) — Defined benefit pension income (expense) Total before tax 18,389 24,167 Tax benefit (1,218) (1,432) Total reclassification of defined benefit pension items, net of tax $ 17,171 $ 22,735 Amortization of cash flow hedging instruments: Foreign currency exchange forward contracts $ (1,746) $ (129) Income (loss) from discontinued businesses Interest rate swaps 4,245 3,474 Interest expense Total before tax 2,499 3,345 Tax benefit (960) (970) Total reclassification of cash flow hedging instruments $ 1,539 $ 2,375 (d) These AOCI components are included in the computation of NPPC. See Note 10, Employee Benefit Plans, for additional information.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Restricted cash	$ 3,762	$ 4,220
Revenue Recognition, Costs-to-Cost Method, Revenue Recognized	$ 50,000

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Details) 2 $ in Thousands	Dec. 31, 2022 USD ($)
Accounting Policies [Abstract]
Revenue Adjustment	$ 2,600

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Details 3) - Self-insurance - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Loss Contingencies [Line Items]
Decrease in pre-tax insurance expense due to retrospective insurance reserve adjustments from continuing operations	$ 1	$ 0.2	$ 1.3
Liabilities for asserted and unasserted claims	32.4	28.3
Liabilities covered by insurance carriers	$ 4	$ 4.1

Summary of Significant Accoun_6

Summary of Significant Accounting Policies (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative [Line Items]
Product revenues	$ 1,889,065	$ 1,848,399	$ 1,534,033
Foreign currency exchange forward contracts | Maximum
Derivative [Line Items]
Maximum typical term of foreign currency forward exchange contracts (in days)	90 days

Acquisitions and Dispositions -

Acquisitions and Dispositions - Schedule of Balance Sheet from Disposal of Harsco Rail Segment (Details) (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
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	$ 159,004	$ 161,999
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	41,049	33,689
Other receivables	4,037	4,740
Inventories	105,256	103,560
Current portion of contract assets	84,848	94,597
Other current assets	30,950	25,442
Property, plant and equipment, net	41,004	39,524
Right-of-use assets, net	5,635	3,108
Goodwill	13,026	13,026
Intangible assets, net	2,746	3,081
Deferred income tax assets	6,887	6,064
Other assets	807	6,432
Total Rail assets included in Assets held-for-sale	336,245	333,263
Accounts payable	49,083	46,076
Accrued compensation	1,211	2,171
Current portion of operating lease liabilities	2,635	1,619
Other current liabilities	45,037	62,401
Current portion of advances on contracts	61,039	49,732
Operating lease liabilities	3,121	1,775
Deferred tax liabilities	5,480	5,736
Other liabilities	861	981
Total Rail liabilities included in Liabilities of assets held-for-sale	$ 168,467	$ 170,491

Acquisitions and Dispositions_2

Acquisitions and Dispositions - Schedule of Income (Loss) from Discontinued Operations Harsco Rail (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
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	$ (40,898)	$ (19,967)	$ 23,096
Selling, general and administrative expenses	4,039	178	0
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	29,331	32,425	31,642
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	21,034	17,272	23,480
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	215,585	266,221	298,189
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	$ 225,769	$ 251,897	$ 235,040

Acquisitions and Dispositions_3

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Depreciation and amortization	$ 0	$ 4,329	$ 5,450
Purchases of property, plant and equipment	$ 1,618	$ 1,406	$ 7,962

Acquisitions and Dispositions_4

Acquisitions and Dispositions - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Provision for Loss on Contracts					$ 33,400
SBB
Business Acquisition [Line Items]
Contract estimated forward loss provision for Harsco Rail Segment				$ 3,500
SBB | Contract 2
Business Acquisition [Line Items]
Percentage Complete	83%			83%
Network Rail
Business Acquisition [Line Items]
Contract estimated forward loss provision for Harsco Rail Segment				$ 29,100
Revenue Reduction	$ 4,600	$ 300	$ 24,200
Network Rail | Contract 2
Business Acquisition [Line Items]
Percentage Complete	50%			50%
Deutsche Bahn
Business Acquisition [Line Items]
Contract estimated forward loss provision for Harsco Rail Segment			$ 7,500	$ 11,500
Revenue Reduction	$ 4,000
Contractual Penalty				$ 3,100
Deutsche Bahn | Contract 2
Business Acquisition [Line Items]
Percentage Complete	32%			32%
Discontinued Operations, Held-for-sale
Business Acquisition [Line Items]
Disposal Group, Including Discontinued Operation, Corporate Overhead				$ 4,200

Accounts Receivable and Note _3

Accounts Receivable and Note Receivable - Schedule of Receivables (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Receivables [Abstract]
Trade accounts receivable	$ 272,775	$ 389,535
Less: Allowance for doubtful accounts	(8,347)	(11,654)
Trade accounts receivable, net	264,428	377,881
Other receivables	$ 25,379	$ 33,059

Accounts Receivable and Note _4

Accounts Receivable and Note Receivable (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Jun. 30, 2022	Jan. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 272,775,000	$ 389,535,000
Accounts Receivable Greater than 12 Months Reserved	3,900,000
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	8,600,000	6,400,000
Receivable with Imputed Interest, Net Amount	23,900,000	$ 31,000,000
P N C Member
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable Securitization, Maximum Purchase Commitment			$ 150,000,000
Accounts Receivable from Securitization	69,700,000
Accounts Receivable Securitization, Amount Sold	145,000,000
Greater than 12 months
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 11,100,000
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

Accounts Receivable and Note _5

Accounts Receivable and Note Receivable - Schedule of Changes in Provisions For Allowance For Credit Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Provision for expected credit losses related to trade accounts receivable	$ 403	$ 589	$ 1,961

Accounts Receivable - Schedule

Accounts Receivable - Schedule of Fair Value of Notes Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Receivables [Abstract]
Receivable with Imputed Interest, Net Amount	$ 23,900	$ 31,000
Notes Receivable, Fair Value Disclosure	$ 23,800	$ 32,300

Accounts Receivable and Note _6

Accounts Receivable and Note Receivable - AR Facility (Details) - AR Facility - USD ($) $ in Thousands	Dec. 31, 2022	Jun. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable Securitization, Amount Sold	$ 145,000	$ 120,000
Additional proceeds	$ 25,000

Accounts Receivable and Note _7

Accounts Receivable and Note Receivable - Factoring Agreements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Receivables [Abstract]
Receivables Sold under Factoring Agreement	$ 17,300	$ 12,900
Receivables Sold under Factoring Agreement, Program Capacities	$ 31,400	$ 16,500

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Inventories
Finished goods	$ 11,809	$ 8,323
Work-in-process	4,241	5,393
Raw materials and purchased parts	25,735	21,188
Stores and supplies	39,590	35,589
Total inventories	81,375	70,493
Valued at lower of cost or market:
LIFO basis	15,473	14,133
FIFO basis	8,826	7,567
Average cost basis	57,076	48,793
Total inventories	81,375	70,493
Excess of inventories valued at current costs over LIFO	14,000	14,000
Change in income as a result of LIFO basis inventory valuation over FIFO basis valuation	$ 0	$ 0

Property, Plant and Equipment_2

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 1,904,406	$ 1,882,303
Less: Accumulated depreciation	(1,247,531)	(1,228,390)
Property, plant and equipment, net	656,875	653,913
Land
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	72,020	73,067
Land improvements
Property, Plant and Equipment [Line Items]
Gross property, plant and equipment	$ 16,750	16,970
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	$ 217,926	221,236
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	$ 1,513,238	1,507,214
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	$ 84,472	$ 63,816

Property, Plant and Equipment -

Property, Plant and Equipment - Narrative (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 656,875	$ 653,913
China
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	96,095	$ 108,496
Harsco Environmental | China
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 18,000

Goodwill and Other Intangible_3

Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Balance at the beginning of the period		$ 883,109	$ 889,048
Changes to goodwill			1,232
Goodwill, Impairment Loss		(104,580)
Foreign currency translation		(19,276)	(7,171)
Balance at the end of the period		759,253	883,109
Harsco Environmental
Goodwill [Roll Forward]
Balance at the beginning of the period		399,230	406,401
Changes to goodwill			0
Goodwill, Impairment Loss		0
Foreign currency translation		(19,276)	(7,171)
Balance at the end of the period		379,954	399,230
Clean Earth
Goodwill [Roll Forward]
Balance at the beginning of the period		483,879	482,647
Changes to goodwill			(1,232)
Goodwill, Impairment Loss	$ 104,600	(104,580)
Foreign currency translation		0	0
Balance at the end of the period		$ 379,299	$ 483,879

Goodwill and Other Intangible_4

Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 487,737	$ 516,240
Accumulated Amortization	135,577	113,439
Intangible assets, net	352,160	402,801
Amortization expense for intangible assets	31,100	32,200	$ 30,600
Estimated amortization expense for the next five years
2023	28,200
2024	27,700
2025	27,500
2026	25,700
2027	24,400
Customer related
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	95,573	104,322
Accumulated Amortization	54,482	54,057
Permits
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	309,177	309,069
Accumulated Amortization	50,703	34,822
Technology related
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	20,800	39,886
Accumulated Amortization	15,491	13,415
Trade names
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	30,212	30,738
Accumulated Amortization	9,198	6,842
Air rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	26,139	26,139
Accumulated Amortization	2,411	1,675
Patents
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	189	179
Accumulated Amortization	155	138
Non-compete agreement
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	2,500	2,500
Accumulated Amortization	1,718	1,094
Other
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	3,147	3,407
Accumulated Amortization	$ 1,419	$ 1,396

Goodwill and Other Intangible_5

Goodwill and Other Intangible Assets- Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill [Line Items]
Goodwill, Impairment Loss		$ 104,580
Goodwill		759,253	$ 883,109	$ 889,048
Impaired asset write-downs		641	1,005	776
Clean Earth
Goodwill [Line Items]
Goodwill, Impairment Loss	$ (104,600)	104,580
Goodwill		379,299	483,879	482,647
Impaired asset write-downs		59	63	0
Harsco Environmental
Goodwill [Line Items]
Goodwill, Impairment Loss		0
Goodwill		379,954	399,230	406,401
Impaired asset write-downs		582	$ 942	$ 776
Altek Group
Goodwill [Line Items]
Impaired asset write-downs		15,000
Asset Impairment Charges, Carrying Value		$ 15,300

Debt and Credit Agreements - Sc

Debt and Credit Agreements - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Long-term Debt	$ 1,348,989	$ 1,369,672
Long-term Debt, Gross	1,364,161	1,387,889
Less: deferred financing costs	15,172	18,217
Current maturities of long-term debt	11,994	10,226
Long-term debt	1,336,995	1,359,446
Revolving Credit Facility
Line of Credit Facility [Line Items]
Long-term Debt	$ 370,000	$ 362,000
Debt, Weighted Average Interest Rate	7.19%	2.45%
New Term Loan
Line of Credit Facility [Line Items]
Long-term Debt	$ 492,500	$ 497,500
Debt, Weighted Average Interest Rate	6.69%	2.75%
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	$ 26,661	$ 28,389
Debt, Weighted Average Interest Rate	5%	4.73%
5.75% notes due May 15,2018 | Senior Notes
Line of Credit Facility [Line Items]
Long-term Debt	$ 475,000	$ 500,000
Debt Instrument, Interest Rate, Stated Percentage	5.75%

Debt and Credit Agreements - _2

Debt and Credit Agreements - Schedule of Maturities of Long Term Debt (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Maturities of Long-term Debt [Abstract]
2024	$ 11,293
2025	9,635
2026	378,542
2027	$ 481,983

Debt and Credit Agreements - Na

Debt and Credit Agreements - Narrative (Details) $ in Thousands		1 Months Ended		3 Months Ended		12 Months Ended			14 Months Ended	30 Months Ended
	Aug. 29, 2022	Dec. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2025	Dec. 31, 2023	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Mar. 10, 2026	Dec. 31, 2024	Sep. 30, 2024
Line of Credit Facility [Line Items]
Interest Paid, Including Capitalized Interest, Operating and Investing Activities						$ 73,400	$ 60,900	$ 59,500
Loss on early extinguishment of debt						$ 2,254	(2,668)	$ 0
Net Debt to Consolidated Adjusted EBITDA Ratio		5.35				5.35
Consolidated Adjusted EBITDA To Consolidated Interest Charges Ratio		3.14				3.14
Short-term borrowings		$ 7,751				$ 7,751	$ 7,748
Short-term Debt, Weighted Average Interest Rate, at Point in Time		4.65%				4.65%	3.26%
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
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%
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				3
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]
Threshold net debt to consolidated adjusted EBITDA ratio covenant		4				4
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%
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 | LIBOR
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 | LIBOR
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
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	2.75
Revolving Credit Facility | Forecast | Maximum
Line of Credit Facility [Line Items]
Net debt to consolidated adjusted EBITDA ratio covenant					5.50
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
Account Receivable Securitization Facility
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 150,000

Debt and Credit Agreements - Ou

Debt and Credit Agreements - Outstanding Amounts Under Revolving Credit Facility (Details) - Line of Credit [Member] $ in Thousands	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	$ 302,682
Line of Credit Facility, Maximum Borrowing Capacity	700,000
Long-term Line of Credit	370,000
Letters of Credit Outstanding, Amount	$ 27,318

Debt and Credit Agreements - _3

Debt and Credit Agreements - Schedule of Facility Fees and Debt-Related Income (Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule of Facility Fees and Debt-Related Income [Line Items]
Loss on early extinguishment of debt	$ 2,254	$ (2,668)	$ 0
Facility fees and debt-related income (expense)	(2,956)	(5,506)	(1,920)
Facility Fees and Debt-Related Income (Expense)
Schedule of Facility Fees and Debt-Related Income [Line Items]
Loss on early extinguishment of debt	2,254	(2,668)	0
Unused Debt Commitment And Amendment Fees	(1,696)	(2,838)	(1,920)
Securitization And Factoring Fees	$ (3,514)	$ 0	$ 0

Leases - Supplemental Income St

Leases - Supplemental Income Statement Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Finance Lease, Right-of-Use Asset, Amortization	$ 3,938	$ 2,510	$ 1,523
Finance Lease, Interest Expense	784	495	184
Operating Lease, Cost	33,773	32,544	28,537
Variable Lease, Cost	49,811	47,780	40,953
Sublease Income	(6)	(53)	(202)
Lease, Cost	$ 88,300	$ 83,276	$ 70,995

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Apr. 06, 2020
Lessee, Lease, Description [Line Items]
Operating Lease, Payments	$ 34,420	$ 33,645	$ 28,057
Finance Lease, Interest Payment on Liability	798	517	184
Finance Lease, Principal Payments	3,975	2,330	1,183
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	32,817	42,442	69,044
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 11,175	$ 11,495	$ 6,220
ESOL
Lessee, Lease, Description [Line Items]
Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Operating Lease, Right-of-Use Asset				$ 56,000

Leases - Supplemental Balance S

Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Right-of-use assets, net	$ 101,253	$ 101,576
Operating Lease, Liability, Current	25,521	25,590
Operating Lease, Liability, Noncurrent	$ 75,246	$ 74,571
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	$ 23,671	$ 17,185
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	$ 5,562	$ 3,756
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term debt	Long-term debt
Finance Lease, Liability, Noncurrent	$ 18,832	$ 13,736
Operating Lease, Right-of-Use Assets, Out Of Period Adjustment	15,000
Operating Lease, Liability, Out Of Period Adjustment	$ 15,000

Leases - Supplemental Lease Inf

Leases - Supplemental Lease Information (Details)	Dec. 31, 2022	Dec. 31, 2021
Leases [Abstract]
Operating Lease, Weighted Average Remaining Lease Term	7 years 5 months 1 day	7 years 1 month 20 days
Finance Lease, Weighted Average Remaining Lease Term	5 years 4 months 6 days	5 years 10 months 17 days
Operating Lease, Weighted Average Discount Rate, Percent	6%	5.90%
Finance Lease, Weighted Average Discount Rate, Percent	5.20%	4.60%

Leases - Schedule of Future Lea

Leases - Schedule of Future Lease Maturities (Details) $ in Thousands	Dec. 31, 2022 USD ($)
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 30,274
Finance Lease, Liability, Payments, Due Next Twelve Months	6,663
Lessee, Operating Lease, Liability, Payments, Due Year Two	24,099
Finance Lease, Liability, Payments, Due Year Two	6,284
Lessee, Operating Lease, Liability, Payments, Due Year Three	17,928
Finance Lease, Liability, Payments, Due Year Three	5,237
Lessee, Operating Lease, Liability, Payments, Due Year Four	13,416
Finance Lease, Liability, Payments, Due Year Four	3,923
Lessee, Operating Lease, Liability, Payments, Due Year Five	8,545
Finance Lease, Liability, Payments, Due Year Five	2,240
Lessee, Operating Lease, Liability, Payments, Due after Year Five	34,233
Finance Lease, Liability, Payments, Due after Year Five	3,868
Lessee, Operating Lease, Liability, Payments, Due	128,495
Finance Lease, Liability, Payment, Due	28,215
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(27,728)
Finance Lease, Liability, Undiscounted Excess Amount	(3,821)
Operating Lease, Liability	100,767
Finance Lease, Liability	$ 24,394

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($)
Leases [Abstract]
Operating And Finance Leases, Excluding Short Term Leases, Weighted-Average Remaining Lease Term	28 years
Operating And Finance Leases, Excluding Short Term Leases, Renewal Option	10 years
Estimated ROU Assets And Lease Liabilities To Be Recognized	$ 11,000

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - Pension Plan - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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	5,716,000	4,813,000	7,381,000
Expected return on plan assets	(10,795,000)	(12,199,000)	(11,368,000)
Recognized prior service costs	0	0	0
Recognized losses	4,732,000	5,538,000	5,100,000
Settlement/curtailment loss (gain)	0	0	0
Defined benefit plans pension cost	(347,000)	(1,848,000)	1,113,000
Multiemployer plans	642,000	640,000	620,000
Defined contribution plans	5,401,000	5,660,000	4,769,000
Net periodic pension cost, U.S. Plans	$ 5,696,000	4,452,000	6,502,000
U.S. Plans | Maximum
Defined Contribution Plan [Abstract]
Employer matching contribution (as a percent)	4%
International Plans
Defined Contribution Plan [Abstract]
Additional contribution towards insurance and administrative costs (as a percent)	2%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 1,867,000	1,805,000	1,642,000
Interest cost	16,500,000	12,652,000	17,599,000
Expected return on plan assets	(38,891,000)	(45,018,000)	(41,013,000)
Recognized prior service costs	534,000	582,000	512,000
Recognized losses	13,060,000	18,119,000	14,723,000
Settlement/curtailment loss (gain)	(33,000)	(6,000)	18,000
Defined benefit plans pension cost	(6,963,000)	(11,866,000)	(6,519,000)
Multiemployer plans	1,114,000	1,035,000	969,000
Defined contribution plans	4,122,000	4,196,000	3,994,000
Net periodic pension cost, International Plans	$ (1,727,000)	$ (6,635,000)	$ (1,556,000)
International Plans | Maximum
Defined Contribution Plan [Abstract]
Employer matching contribution (as a percent)	6%

Employee Benefit Plans (Detai_2

Employee Benefit Plans (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Noncurrent liabilities	$ 46,601	$ 93,693
Liabilities of assets held-for-sale	$ 9,463	$ 8,492
Pension Plan
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rates	2.10%	1.60%	2.40%
Expected long-term rates of return on plan assets	4.70%	5.10%	5.60%
Expected long-term rates of return on plan assets for next year (as a percent)	5.50%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rates	5.10%	2.10%
U.S. Plans | Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 277,007	$ 296,660
Service cost	0	0	$ 0
Interest cost	5,716	4,813	7,381
Plan participants' contributions	0	0
Actuarial loss	(57,841)	(8,063)
Settlements/curtailments	0	0
Benefits paid	(15,700)	(16,403)
Effect of foreign currency	0	0
Benefit obligation at end of year	209,182	277,007	296,660
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	232,947	226,125
Actual return on plan assets	(41,909)	19,005
Employer contributions	1,706	4,219
Plan participants' contributions	0	0
Settlements/curtailments	0	0
Benefits paid	(15,700)	(16,402)
Effect of foreign currency	0	0
Fair value of plan assets at end of year	177,044	232,947	$ 226,125
Funded status at end of year	(32,138)	(44,060)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Noncurrent assets	0	0
Current liabilities	1,851	1,999
Noncurrent liabilities	30,287	42,061
Total accumulated other comprehensive loss before tax	105,005	114,874
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net actuarial loss	105,005	114,874
Prior service cost	0	0
Total accumulated other comprehensive loss before tax	105,005	$ 114,874
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	1,900
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2021	26,300
2022	16,400
2023	16,400
2024	16,200
2025	16,100
2026-2030	$ 76,600
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rates	2.70%	2.40%	3.20%
Expected long-term rates of return on plan assets	6.30%	6.80%	7%
Expected long-term rates of return on plan assets for next year (as a percent)	7%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rates	5.30%	2.70%
Highest yield U.S. dollar-denominated, AA-graded corporate bonds excluded from yield curve universe (as a percent)	10%
Lowest yield U.S. dollar-denominated, AA-graded corporate bonds excluded from yield curve universe (as a percent)	10%
International Plans | Pension Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 1,022,198	$ 1,119,552
Service cost	1,867	1,805	$ 1,642
Interest cost	16,500	12,652	17,599
Plan participants' contributions	14	15
Actuarial loss	(299,841)	(58,567)
Settlements/curtailments	(132)	(269)
Benefits paid	(37,135)	(39,831)
Effect of foreign currency	(106,281)	(13,159)
Benefit obligation at end of year	597,190	1,022,198	1,119,552
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	973,252	957,177
Actual return on plan assets	(250,002)	40,382
Employer contributions	22,614	25,077
Plan participants' contributions	14	15
Settlements/curtailments	(132)	(269)
Benefits paid	(37,135)	(39,220)
Effect of foreign currency	(101,377)	(9,910)
Fair value of plan assets at end of year	607,234	973,252	$ 957,177
Funded status at end of year	10,044	(48,946)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Noncurrent assets	26,033	2,046
Current liabilities	924	967
Noncurrent liabilities	15,065	50,025
Total accumulated other comprehensive loss before tax	346,068	410,114
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax [Abstract]
Net actuarial loss	337,849	400,497
Prior service cost	8,219	9,617
Total accumulated other comprehensive loss before tax	346,068	$ 410,114
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	23,300
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2021	38,100
2022	38,800
2023	40,200
2024	41,300
2025	42,700
2026-2030	$ 225,400
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]
Discount rates	1.90%	1.40%	2.10%
Expected long-term rates of return on plan assets	4.40%	4.70%	5.20%
Expected long-term rates of return on plan assets for next year (as a percent)	5.10%
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rates	5.10%	1.90%

Employee Benefit Plans (Detai_3

Employee Benefit Plans (Details 3) - Pension Plan $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) market shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($)
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Expected long-term rates of return on plan assets for next year (as a percent)		5.50%
Expected long-term rates of return on plan assets		4.70%	5.10%	5.60%
U.S. Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation		$ 209,200	$ 277,000
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]
Projected benefit obligation		209,200	277,000
Accumulated benefit obligation		209,200	277,000
Fair value of plan assets		$ 177,000	$ 232,900
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%
Expected long-term rates of return on plan assets		6.30%	6.80%	7%
Number of shares of Company's common stock included in plan assets | shares		310,000	310,000
Fair values of plan assets		$ 177,044	$ 232,947	$ 226,125
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	226,125
Employer contributions		1,706	4,219
Fair value of plan assets at end of year		$ 177,044	$ 232,947	$ 226,125
U.S. Plans | Forecast
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Expected long-term rates of return on plan assets	7%
U.S. Plans | Domestic equity securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31		21%	22.80%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		$ 1,951	$ 5,180
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 1,951	5,180
Fair value of plan assets at end of year		$ 1,951	5,180
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)		18%
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)		28%
U.S. Plans | Domestic mutual funds—equities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		$ 35,177	48,411
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	35,177	48,411
Fair value of plan assets at end of year		$ 35,177	$ 48,411
U.S. Plans | International equity securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31		22.20%	22.50%
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)		17%
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)		27%
U.S. Plans | International equities—mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		$ 39,287	$ 50,783
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	39,287	50,783
Fair value of plan assets at end of year		$ 39,287	$ 50,783
U.S. Plans | Harsco common stock
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31		1.10%	2.20%
U.S. Plans | Fixed income securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31		44.60%	45.90%
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)		41%
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)		51%
U.S. Plans | Mutual funds - bonds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		$ 78,943	$ 105,114
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	78,943	105,114
Fair value of plan assets at end of year		$ 78,943	$ 105,114
U.S. Plans | Other
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31		11.20%	8.80%
U.S. Plans | Other | Minimum
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)		4%
U.S. Plans | Other | Maximum
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)		14%
U.S. Plans | Other mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		$ 6,699	$ 9,371
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	6,699	9,371
Fair value of plan assets at end of year		$ 6,699	$ 9,371
U.S. Plans | Cash and cash equivalents
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31		1%	0%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		$ 1,780	$ 1,624
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,780	1,624
Fair value of plan assets at end of year		$ 1,780	1,624
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%
U.S. Plans | Partnership [Member]
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		$ 13,207	12,464
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	13,207	12,464
Fair value of plan assets at end of year		13,207	12,464
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		2,000	5,200
U.S. Plans | Level 1
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		163,837	220,483
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	163,837	220,483
Fair value of plan assets at end of year		163,837	220,483
U.S. Plans | Level 1 | Domestic equity securities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		1,951	5,180
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,951	5,180
Fair value of plan assets at end of year		1,951	5,180
U.S. Plans | Level 1 | Domestic mutual funds—equities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		35,177	48,411
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	35,177	48,411
Fair value of plan assets at end of year		35,177	48,411
U.S. Plans | Level 1 | International equities—mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		39,287	50,783
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	39,287	50,783
Fair value of plan assets at end of year		39,287	50,783
U.S. Plans | Level 1 | Mutual funds - bonds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		78,943	105,114
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	78,943	105,114
Fair value of plan assets at end of year		78,943	105,114
U.S. Plans | Level 1 | Other mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		6,699	9,371
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	6,699	9,371
Fair value of plan assets at end of year		6,699	9,371
U.S. Plans | Level 1 | Cash and cash equivalents
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		1,780	1,624
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	1,780	1,624
Fair value of plan assets at end of year		1,780	1,624
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	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		13,207	12,464
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	13,207	12,464
Fair value of plan assets at end of year		13,207	12,464
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	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	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	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] | 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	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	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	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		13,207	12,464
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	13,207	12,464
Fair value of plan assets at end of year		13,207	12,464
International Plans
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation		593,400	1,016,100
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract]
Projected benefit obligation		25,300	988,600
Accumulated benefit obligation		22,600	984,700
Fair value of plan assets		$ 9,400	$ 939,300
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Expected long-term rates of return on plan assets for next year (as a percent)		5.10%
Expected long-term rates of return on plan assets		4.40%	4.70%	5.20%
Fair values of plan assets		$ 607,234	$ 973,252	$ 957,177
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	957,177
Employer contributions		22,614	25,077
Fair value of plan assets at end of year		$ 607,234	$ 973,252	$ 957,177
International Plans | Equity Securities [Member]
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31		24.80%	27.90%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)		26.50%
International Plans | Mutual funds - equities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		$ 150,813	$ 271,811
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	150,813	271,811
Fair value of plan assets at end of year		$ 150,813	$ 271,811
International Plans | Fixed income securities
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31		65.50%	63.60%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)		65.50%
International Plans | Mutual funds - bonds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		$ 392,960	$ 613,243
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	392,960	613,243
Fair value of plan assets at end of year		392,960	613,243
International Plans | Insurance contracts
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		4,636	5,684
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	4,636	5,684
Fair value of plan assets at end of year		$ 4,636	$ 5,684
International Plans | Other
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31		8.20%	7.80%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)		8%
International Plans | Other mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		$ 49,805	$ 75,651
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	49,805	75,651
Fair value of plan assets at end of year		$ 49,805	$ 75,651
International Plans | Cash and cash equivalents
Defined Benefit Plan, Information about Plan Assets [Abstract]
Percentage of Plan Assets at December 31		1.50%	0.70%
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Target Long-Term Allocation (less than 5% for Cash and cash equivalents)		0%
Fair values of plan assets		$ 9,020	$ 6,863
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	9,020	6,863
Fair value of plan assets at end of year		9,020	6,863
International Plans | Level 1
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		9,020	6,863
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	9,020	6,863
Fair value of plan assets at end of year		9,020	6,863
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	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	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	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	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		9,020	6,863
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	9,020	6,863
Fair value of plan assets at end of year		9,020	6,863
International Plans | Level 2
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		598,214	966,389
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	598,214	966,389
Fair value of plan assets at end of year		598,214	966,389
International Plans | Level 2 | Mutual funds - equities
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		150,813	271,811
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	150,813	271,811
Fair value of plan assets at end of year		150,813	271,811
International Plans | Level 2 | Mutual funds - bonds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		392,960	613,243
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	392,960	613,243
Fair value of plan assets at end of year		392,960	613,243
International Plans | Level 2 | Insurance contracts
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		4,636	5,684
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	4,636	5,684
Fair value of plan assets at end of year		4,636	5,684
International Plans | Level 2 | Other mutual funds
Defined Benefit Plan, Plan Assets, Allocations [Abstract]
Fair values of plan assets		49,805	75,651
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	49,805	75,651
Fair value of plan assets at end of year		49,805	75,651
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	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%
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%	4.30%
Pension plan assets as a percentage of international plan assets		94%

Employee Benefit Plans (Detai_4

Employee Benefit Plans (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Retirement Benefits [Abstract]
Contributions By The Company	$ 1.9	$ 1.7	$ 1.6

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income from continuing operations before income taxes and equity income
U.S.	$ (152,602)	$ (34,462)	$ (87,315)
International	29,644	71,968	33,095
Income (loss) from continuing operations before income taxes and equity income	(122,958)	37,506	(54,220)
Currently payable:
U.S. federal	0	0	(12,116)
U.S. state	1,416	507	468
International	14,914	22,295	16,518
Total income taxes currently payable	16,330	22,802	4,870
Deferred U.S. federal	(6,219)	(4,594)	(10,558)
Deferred U.S. state	(2,274)	(18)	(3,078)
Deferred international	2,544	(9,101)	93
Total income tax expense from continuing operations	10,381	9,089	(8,673)
Cash payments for income taxes, including taxes on gain or loss from discontinued business	$ 20,900	$ 21,700	$ 34,900

Income Taxes (Details 2)

Income Taxes (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Line Items]
Foreign earnings before tax	$ 29,644	$ 71,968	$ 33,095
Differences on international earnings and remittances	10,300	4,500
Income Tax Expense (Benefit)	10,381	9,089	(8,673)
Total international income tax expense	14,914	22,295	16,518
Operating loss carryforwards	54,237	67,442
Valuation Allowance	89,234	92,385
Interest and penalties recognized	400	400	200
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	1,300	1,700	$ 1,400
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	1,100
Current Foreign Tax Expense (Benefit)	17,400	13,200
Clean Earth
Income Tax Disclosure [Line Items]
Income Tax Expense (Benefit)	3,000
Altek Group
Income Tax Disclosure [Line Items]
Income Tax Expense (Benefit)	0
International operations
Income Tax Disclosure [Line Items]
Operating loss carryforwards	40,600
Operating loss carryforwards not subject to expiration	35,500
Operating losses subject to expiration	5,100
U.S. state
Income Tax Disclosure [Line Items]
Operating loss carryforwards	12,100
United States
Income Tax Disclosure [Line Items]
Differences on international earnings and remittances	100	$ 100
Brazil | Harsco Environmental
Income Tax Disclosure [Line Items]
Income Tax Expense (Benefit)	$ 6,800

Income Taxes (Details 3)

Income Taxes (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Percent [Abstract]
U.S. federal income tax expense (benefit), at statutory tax rate of 21%	$ (25,821)	$ 7,877	$ (11,386)
U.S. state income taxes, net of federal income tax benefit	(929)	(310)	(2,015)
U.S. other domestic deductions and credits	(594)	(415)	(1,312)
Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential and Repatriation of Foreign Earnings	(8,929)	(4,488)	(7,872)
Uncertain tax position contingencies and settlements	(290)	783	289
Changes in realization of deferred tax assets	8,263	(5,035)	(1,501)
U.S. non-deductible expenses	791	936	2,300
Effective Income Tax Rate Reconciliation, Net Operating Loss Carryback, Amount	19,548	0	0
State deferred tax rate changes	154	592	(40)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount	1,268	173	(184)
Net operating loss carryback	0	0	(2,696)
Total income tax expense from continuing operations	$ 10,381	$ 9,089	$ (8,673)
Annual effective income tax rate	(8.40%)	24.20%	16%
International	$ 29,644	$ 71,968	$ 33,095
Income Tax Expense (Benefit)	10,381	9,089	(8,673)
Capital Gain (Loss), Non-taxable		7,000
Current Foreign Tax Expense (Benefit)	17,400	13,200
Differences on international earnings and remittances	10,300	4,500
U.S.	(152,602)	(34,462)	(87,315)
Income Tax Expense (Benefit), Increase (Decrease) From Prior Year	7,100	4,100
Effective Income Tax Rate Reconciliation Foreign derived intangible income deduction	$ (938)	$ 0	$ 0

Income Taxes (Details 4)

Income Taxes (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
U.S.	$ 152,602	$ 34,462	$ 87,315
Interest and penalties recognized	400	400	$ 200
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	25,024	24,802
Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals	0	0
Expense accruals	28,758	24,949
Deferred Tax Liabilities, Inventory	0	0
Inventories	4,011	3,400
Deferred Tax Liability, Tax Deferred Expense, Reserve and Accrual, Accounts Receivable, Allowance for Credit Loss	0	0
Provision for receivables	2,781	3,997
Deferred Tax Assets, Deferred Income	4,484	0
Deferred Tax Liability, Operating loss carryforwards	0	0
Operating loss carryforwards	54,237	67,442
Deferred Tax Liability, Tax credit carryforwards	0	0
Tax credit carryforwards	21,443	18,608
Pensions	5,171	23,298
Deferred Tax Liabilities, Unrealized Currency Loss	3,330	0
Currency adjustments	0	3,701
Section 163(j) disallowed interest expense	13,869	4,843
Deferred Tax Liabilities, Deferred Expense, Capitalized Research and Development Costs	0	0
Research and development	2,795	0
Deferred Tax Liability, Tax Deferred Expense, Compensation and Benefits, Share-Based Compensation Cost	0	0
Stock based compensation	6,580	7,396
Other	0	2,164
Subtotal	169,153	184,600
Deferred Tax Liability, Valuation Allowance	0	0
Valuation allowance	(89,234)	(92,385)
Total deferred income taxes	79,919	92,215
Liability
Depreciation and amortization	61,145	80,278
Right-of-use assets	24,826	25,130
Deferred revenue	0	2,750
Deferred Tax Liabilities, Other	3,198	0
Total deferred income taxes	92,499	108,158
Valuation Allowance, Deferred Tax Asset, Decrease From Pension Adjustment	7,100
Valuation Allowance, Deferred Tax Asset, Increase From Tax Rate Adjustment	5,200
Valuation Allowance, Deferred Tax Asset, Reduction Related to Disallowed Interest Expense	$ 8,900
Dividend Received Deduction, Tax Act, Percent	100%
Foreign Currency Translation Adjustment, Valuation Allowance Reduction, Reduction to Deferred Tax Assets	$ 6,400
Valuation Allowance, Deferred Tax Asset, Decrease From Certain U.S Jurisdictions	4,300
Deferred Tax Liability, Tax Deferred Expense, Compensation and Benefits, Pensions	0	0
Deferred Tax Liability, Disallowed Interest Expense	0	$ 0
Capital Loss Carryforward
Liability
Tax Credit Carryforward, Amount	1,000,000
Domestic Tax Authority [Member]
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards not subject to expiration	1,500
Asset
Operating loss carryforwards	1,500
International operations
Operating Loss Carryforwards [Line Items]
Operating losses subject to expiration	5,100
Operating loss carryforwards not subject to expiration	35,500
Asset
Operating loss carryforwards	40,600
U.S. state
Asset
Operating loss carryforwards	12,100
U.S. state | Tax Years 2021 Through 2025 [Member]
Asset
Operating loss carryforwards	1,800
U.S. state | Tax Years 2026 Through 2030 [Member]
Asset
Operating loss carryforwards	2,500
U.S. state | Tax Years 2031 Through 2035 [Member]
Asset
Operating loss carryforwards	3,600
U.S. state | Tax Years 2036 Through 2040 [Member]
Asset
Operating loss carryforwards	$ 4,200

Income Taxes (Details 5)

Income Taxes (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at the beginning of the period	$ 3,127	$ 2,896	$ 3,129
Additions for tax positions related to the current year (includes currency translation adjustment)	189	316	596
Additions for tax positions related to prior years (includes currency translation adjustment)		500
Statutes of limitations expirations	(524)	(585)	(58)
Other reductions for tax positions related to prior years			771
Balance at the end of the period	2,792	3,127	2,896
Reconciliation of Deferred Income Tax Benefits [Roll Forward]
Balance at beginning of period	(22)	(22)	(22)
Additions for tax positions related to the current year (includes currency translation adjustment)	(1)	(1)	(2)
Additions for tax positions related to prior years (includes currency translation adjustment)		0
Statutes of limitation expirations	2	1	2
Balance at the end of the period	(21)	(22)	(22)
Reconciliation of Net Unrecognized Tax Benefits [Roll Forward]
Balance at the beginning of the period	3,105	2,874	3,107
Additions for tax positions related to the current year (includes currency translation adjustment)	188	315	594
Additions for tax positions related to prior years (includes currency translation adjustment)		500
Statutes of limitation expirations	(522)	(584)	(56)
Balance at the end of the period	$ 2,771	$ 3,105	2,874
Other reductions for tax positions related to prior years			0
Other reductions for tax positions related to prior years			$ (771)

Commitments and Contingencies -

Commitments and Contingencies - Schedule of Loss Contingencies by Contingency (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Current Portion of Environmental Liabilities	$ 7,120,000	$ 7,338,000
Total environmental liabilities	34,000,000	35,773,000
Accrued Environmental Loss Contingencies, Noncurrent	$ 26,880,000	$ 28,435,000

Commitments and Contingencies (

Commitments and Contingencies (Details)

1 Months Ended

12 Months Ended

Dec. 06, 2018 USD ($)

Jun. 04, 2018 USD ($)

Aug. 31, 2005 USD ($)

Dec. 31, 2022 USD ($) claim case defendant

Mar. 22, 2022 USD ($)

Mar. 21, 2022 USD ($)

Feb. 25, 2022 EUR (€)

Nov. 23, 2021 USD ($)

Oct. 14, 2021 EUR (€)

Dec. 30, 2020 USD ($)

Nov. 01, 2019 USD ($)

Nov. 01, 2019 BRL (R$)

Mar. 19, 2019 USD ($)

Mar. 19, 2019 BRL (R$)

Commitments and Contingencies

Accrual for Environmental Loss Contingencies

$ 6,200,000

Penalties per day

$ 3,000,000

$ 1,000,000

€ 5,000

€ 100,000

$ 5,000

R$ 25000

$ 1,000

R$ 5000

Malpractice Insurance, Deductible

5,000,000

Penalties

2,000,000

10,000,000

Payments for Legal Settlements

$ 239,500

Proposed Civil Penalty

$ 390,092

EnvironmentalLossContingencyStatementOfFinancialPositionExtensibleEnumerationNotDisclosedFlag

Company’s results of operations

Penalty Liability

$ 600,000

Other

Commitments and Contingencies

Number of pending claims | claim

17,224

Loss provision

$ 0

Loss Contingency, Number of Defendants | defendant

90

Loss Contingency, Claims Dismissed, Number | case

28,416

Other | Minimum

Commitments and Contingencies

Loss Contingency, Damages Sought, Value

$ 20,000,000

Other | Maximum

Commitments and Contingencies

Loss Contingency, Damages Sought, Value

$ 25,000,000

Pending Litigation, Active Or In Extremis Docket | Other

Commitments and Contingencies

Number of pending claims | claim

39

Sao Paulo State Revenue Authority | Value-Added Tax Assessments January 2004 To May 2005

Commitments and Contingencies

Loss Contingency, Damages Sought, Principal Amount

$ 1,100,000

$ 1,100,000

Estimated claims or assessment, additional amount

$ 6,900,000

16,900,000

Sao Paulo State Revenue Authority | Value-Added Tax Assessments January 2002 To December 2003

Commitments and Contingencies

Loss Contingency, Damages Sought, Principal Amount

$ 1,100,000

Estimated claims or assessment, additional amount

$ 5,300,000

3,600,000

Loss Contingency, Damages Sought, Value

$ 800,000

$ 4,800,000

Loss provision

$ 0

New York County as managed by the New York Supreme Court | Other

Commitments and Contingencies

Number of pending claims | case

16,588

New York County as managed by the New York Supreme Court | Pending And Future Litigation, Deferred Or Inactive Docket | Other

Commitments and Contingencies

Number of pending claims | claim

16,549

New York State Supreme Court, Counties Excluding New York County [Member] | Other

Commitments and Contingencies

Number of pending claims | case

115

Courts Located In States Other Than New York | Other

Commitments and Contingencies

Number of pending claims | case

521

Brazil

Commitments and Contingencies

Loss Contingencies, Unpaid Service Taxes

$ 2,000,000

Loss Contingencies, Overall Liability

$ 3,400,000

CSN [Member]

Commitments and Contingencies

Penalties per day

$ 19,000

R$ 100000

$ 4,000

R$ 20000

Capital Stock (Details)

Capital Stock (Details) - $ / shares	Dec. 31, 2022	Dec. 31, 2021
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

Capital Stock (Details 2)

Capital Stock (Details 2) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Common Stock
Common Stock, Shares, Issued	115,906,393	115,430,042	114,720,347
Treasury Stock, Shares, Beginning Balance	36,690,847	36,505,672	36,205,589
Common Stock, Shares, Outstanding, Beginning Balance	79,215,546	78,924,370	78,514,758
Vested Restricted Stock Units (in shares)	87,765	305,535	229,413
Stock Issued During Period, Shares, Other		124,077	471,412
Stock issued during period, stock appreciation rights (in shares)	23,311	46,739	8,870
Shares outstanding at the end of the period	116,358,520	115,906,393	115,430,042
Treasury Stock, Shares	36,868,880	36,690,847	36,505,672
Common Stock, Shares, Outstanding	79,489,640	79,215,546	78,924,370
Stock Issued During Period, Shares, Restricted Stock Award, Gross	341,051
Treasury Stock
Common Stock
Vested Restricted Stock Units (in shares)	40,304	112,275	91,188
Stock Issued During Period, Shares, Other		54,950	206,261
Stock issued during period, stock appreciation rights (in shares)	6,640	17,950	2,634
Stock Issued During Period, Shares, Restricted Stock Award, Gross	131,089
Outstanding Shares
Common Stock
Vested Restricted Stock Units (in shares)	47,461	193,260	138,225
Stock Issued During Period, Shares, Other		69,127	265,151
Stock issued during period, stock appreciation rights (in shares)	16,671	28,789	6,236
Stock Issued During Period, Shares, Restricted Stock Award, Gross	209,962

Capital Stock - Reconciliation

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, 2022	Dec. 31, 2021	Dec. 31, 2020
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)	$ (137,155)	$ 22,137	$ (49,727)
Weighted average shares of common stock outstanding	79,493	79,234	78,939
Dilutive effect of stock-based compensation (in shares)	0	1,055	0
Weighted-average shares outstanding—diluted (in shares)	79,493	80,289	78,939
Basic (in dollars per share)	$ (1.73)	$ 0.28	$ (0.63)
Diluted (in dollars per share)	$ (1.73)	$ 0.28	$ (0.63)

Capital Stock (Details 3)

Capital Stock (Details 3) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Restricted stock units
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	672	0	714
Stock Appreciation Rights (SARs)
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	2,092	826	2,474
Performance Shares [Member]
Antidilutive securities
Number of securities not included in computation of diluted earnings per share (in shares)	1,040	865	887

Stock-Based Compensation (Restr

Stock-Based Compensation (Restricted Stock) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended				12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Oct. 31, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					514,611
Granted (in dollars per share)					$ 11.80
Recognized stock-based compensation expense					$ 4,335	$ 4,819	$ 3,665
Restricted stock unit activity
Nonvested at the beginning of the period (in shares)					712,844
Granted (in shares)					514,611
Vested (in shares)					(342,907)
Forfeited (in shares)					(212,964)
Nonvested at the end of the period (in shares)					671,584	712,844
Weighted Average Grant-Date Fair Value
Nonvested at the beginning of the period (in dollars per share)					$ 14.68
Granted (in dollars per share)					11.80
Vested (in dollars per share)					14.87
Forfeited (in dollars per share)					14.28
Nonvested at the end of the period (in dollars per share)					$ 12.51	$ 14.68
Additional disclosures
Unrecognized stock-based compensation expense					$ 4,500
Unrecognized stock-based compensation expense, period of recognition					1 year 9 months 18 days
Fair value of RSU, vested in period					$ 5,100	$ 4,100	4,300
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		316,959	11,194	513,995	500,624
Granted (in dollars per share)	$ 16.54	$ 25.38	$ 17.01	$ 4.40	$ 16.54
Recognized stock-based compensation expense					$ 4,200	$ 5,100	$ 3,200
Restricted stock unit activity
Nonvested at the beginning of the period (in shares)					753,793
Granted (in shares)		316,959	11,194	513,995	500,624
Vested (in shares)					(378,466)
Forfeited (in shares)					(213,999)
Nonvested at the end of the period (in shares)					661,952	753,793
Weighted Average Grant-Date Fair Value
Nonvested at the beginning of the period (in dollars per share)					$ 13.05
Granted (in dollars per share)	$ 16.54	$ 25.38	$ 17.01	$ 4.40	16.54
Vested (in dollars per share)					4.80
Forfeited (in dollars per share)					14.51
Nonvested at the end of the period (in dollars per share)					$ 19.94	$ 13.05
Additional disclosures
Unrecognized stock-based compensation expense					$ 6,400
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					9,900,000
Number of shares available for grant					2,200,000
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					6,500,000
Number of shares available for grant					1,500,000
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					302,000
1995 Non-Employee Directors' Stock Plan | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					63,696	23,224	34,986	14,211
Granted (in dollars per share)					$ 7.85	$ 21.53	$ 10.29	$ 25.33
Restricted stock unit activity
Granted (in shares)					63,696	23,224	34,986	14,211
Weighted Average Grant-Date Fair Value
Granted (in dollars per share)					$ 7.85	$ 21.53	$ 10.29	$ 25.33
1995 Non-Employee Directors' Stock Plan | Restricted stock units | 2019
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 | 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized stock-based compensation expense					0	120	240
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					167	333	0
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					$ 333	$ 0	$ 0
1995 Executive Incentive Compensation Plan | Restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					450,915	343,125	522,087	270,864	242,791	286,251
Granted (in dollars per share)					$ 12.36	$ 18.62	$ 8.22	$ 22.25	$ 19.93	$ 13.70
Restricted stock unit activity
Granted (in shares)					450,915	343,125	522,087	270,864	242,791	286,251
Weighted Average Grant-Date Fair Value
Granted (in dollars per share)					$ 12.36	$ 18.62	$ 8.22	$ 22.25	$ 19.93	$ 13.70
1995 Executive Incentive Compensation Plan | Restricted stock units | 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized stock-based compensation expense					$ 0	$ 0	$ 85
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	142	706
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					314	1,239	1,270
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					741	1,093	1,244
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					1,294	1,892	0
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					$ 1,486	$ 0	$ 0

Stock-Based Compensation (Stock

Stock-Based Compensation (Stock Appreciation Rights) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended							4 Months Ended	12 Months Ended
	Dec. 31, 2022	Oct. 31, 2022	Sep. 30, 2022	Mar. 31, 2022	Mar. 31, 2021	Oct. 31, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Number of Shares
Stock appreciation rights exercised (in shares)									(16,671)	(28,789)	(6,236)
Weighted Average Exercise Price
Options vested, outstanding (in shares)	1,621,391							1,621,391	1,621,391
Options non-vested (in shares)	470,471							470,471	470,471
Weighted Average Exercise Price Per Share (in dollars per share)	$ 14.68							$ 14.68	$ 14.68
Weighted-Average Remaining Contractual Life in Years									5 years 25 days
Number of exercisable options (in shares)	1,621,391							1,621,391	1,621,391
Weighted average exercise price per share (in dollars per share)	$ 15.31							$ 15.31	$ 15.31
$5.02 - $13.70
Weighted Average Exercise Price
Options vested, outstanding (in shares)	777,700							777,700	777,700
Options non-vested (in shares)	383,485							383,485	383,485
Weighted Average Exercise Price Per Share (in dollars per share)	$ 10.15							$ 10.15	$ 10.15
Weighted-Average Remaining Contractual Life in Years									6 years 2 months 4 days
Number of exercisable options (in shares)	777,700							777,700	777,700
Weighted average exercise price per share (in dollars per share)	$ 9.67							$ 9.67	$ 9.67
$16.53 - $22.70
Weighted Average Exercise Price
Options vested, outstanding (in shares)	650,634							650,634	650,634
Options non-vested (in shares)	86,986							86,986	86,986
Weighted Average Exercise Price Per Share (in dollars per share)	$ 19.16							$ 19.16	$ 19.16
Weighted-Average Remaining Contractual Life in Years									4 years 2 months 23 days
Number of exercisable options (in shares)	650,634							650,634	650,634
Weighted average exercise price per share (in dollars per share)	$ 19.24							$ 19.24	$ 19.24
$23.25 - $26.92
Weighted Average Exercise Price
Options vested, outstanding (in shares)	193,057							193,057	193,057
Options non-vested (in shares)	0							0	0
Weighted Average Exercise Price Per Share (in dollars per share)	$ 24.79							$ 24.79	$ 24.79
Weighted-Average Remaining Contractual Life in Years									1 year 7 months 13 days
Number of exercisable options (in shares)	193,057							193,057	193,057
Weighted average exercise price per share (in dollars per share)	$ 24.79							$ 24.79	$ 24.79
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)	3.75%	4.10%	3.56%	1.67%	0.91%	0.44%	0.76%
Dividend yield (as a percent)	0%	0%	0%	0%	0%	0%	0%
Expected life	6 years	6 years	6 years	6 years	6 years	6 years	6 years
Volatility (as a percent)	62.40%	61.30%	60.60%	60.30%	61.90%	60.30%	45.20%
SAR grant price (usd per share)	$ 6.15	$ 5.26	$ 5.02	$ 12.65	$ 18.58	$ 14.89	$ 10.29	$ 6.15	$ 6.15
Number of Shares
Outstanding at beginning of period (in shares)									2,394,055
Granted (in shares)									342,987
Stock appreciation rights exercised (in shares)									(118,618)
Forfeited (in shares)									(526,562)
Outstanding at end of period (in shares)	2,091,862							2,091,862	2,091,862	2,394,055
Weighted Average Exercise Price
Outstanding at beginning of period (usd per share)									$ 14.75
Granted (usd per share)									12.02
Exercised (in dollars per share)									7.97
Forfeited/expired (usd per share)									14.78
Outstanding at end of period	$ 14.68							$ 14.68	$ 14.68	$ 14.75
Outstanding - Aggregate Intrinsic Value	$ 0							$ 0	$ 0	$ 8,600
Total intrinsic value of SARs									0	600	$ 500
Recognized stock-based compensation expense									1,500	$ 1,800	1,700
Unrecognized stock-based compensation expense	$ 1,700							$ 1,700	$ 1,700
Unrecognized stock-based compensation expense, period of recognition									1 year 9 months 18 days
Unvested activity
Nonvested at the beginning of the period (in shares)									664,880
Granted (in shares)									342,987
Vested (in shares)									(322,368)
Forfeited									(215,028)
Nonvested at the end of the period (in shares)	470,471							470,471	470,471	664,880
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)									$ 5.63
Granted (in dollars per share)	$ 3.72	$ 3.17	$ 2.97	$ 7.20	$ 10.48	$ 8.12	$ 3.03		6.86
Vested (in dollars per share)									5.54
Forfeited (in dollars per share)									6.57
Nonvested at the end of the period (in dollars per share)	$ 6.16							$ 6.16	6.16	$ 5.63
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)				1.59%	0.25%	0.17%	0.56%
Dividend yield (as a percent)				0%	0%	0%	0%
Expected life				2 years 9 months 29 days	2 years 9 months 29 days	2 years 2 months 12 days	2 years 9 months 21 days
Weighted Average Exercise Price
Recognized stock-based compensation expense									$ 4,200	$ 5,100	3,200
Unrecognized stock-based compensation expense	$ 6,400							$ 6,400	$ 6,400
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)									753,793
Granted (in shares)					316,959	11,194	513,995		500,624
Vested (in shares)									(378,466)
Forfeited									(213,999)
Nonvested at the end of the period (in shares)	661,952							661,952	661,952	753,793
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)									$ 13.05
Granted (in dollars per share)				$ 16.54	$ 25.38	$ 17.01	$ 4.40		16.54
Vested (in dollars per share)									4.80
Forfeited (in dollars per share)									14.51
Nonvested at the end of the period (in dollars per share)	$ 19.94							$ 19.94	$ 19.94	$ 13.05
Performance period									3 years
Restricted stock units
Weighted Average Exercise Price
Recognized stock-based compensation expense									$ 4,335	$ 4,819	$ 3,665
Unrecognized stock-based compensation expense	$ 4,500							$ 4,500	$ 4,500
Unrecognized stock-based compensation expense, period of recognition									1 year 9 months 18 days
Unvested activity
Nonvested at the beginning of the period (in shares)									712,844
Granted (in shares)									514,611
Vested (in shares)									(342,907)
Forfeited									(212,964)
Nonvested at the end of the period (in shares)	671,584							671,584	671,584	712,844
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)									$ 14.68
Granted (in dollars per share)									11.80
Vested (in dollars per share)									14.87
Forfeited (in dollars per share)									14.28
Nonvested at the end of the period (in dollars per share)	$ 12.51							$ 12.51	$ 12.51	$ 14.68
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)				312,987	184,641	20,526	785,152	10,000

Stock-Based Compensation (Perfo

Stock-Based Compensation (Performance Stock Units) (Details) - Performance Stock Units - USD ($) $ / shares in Units, $ in Millions	1 Months Ended				12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Oct. 31, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
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)	1.59%	0.25%	0.17%	0.56%
Dividend yield (as a percent)	0%	0%	0%	0%
Expected Life (Years)	2 years 9 months 29 days	2 years 9 months 29 days	2 years 2 months 12 days	2 years 9 months 21 days
Volatility	50.40%	50.70%	53.70%	36%
Fair value of award (in dollars per share)	$ 16.54	$ 25.38	$ 17.01	$ 4.40	$ 16.54
Recognized stock-based compensation expense					$ 4.2	$ 5.1	$ 3.2
Unrecognized stock-based compensation expense					$ 6.4
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)					753,793
Granted (in shares)		316,959	11,194	513,995	500,624
Forfeited (in shares)					(213,999)
Vested (in shares)					(378,466)
Nonvested at the end of the period (in shares)					661,952	753,793
Weighted Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)					$ 13.05
Granted (in dollars per share)	$ 16.54	$ 25.38	$ 17.01	$ 4.40	16.54
Forfeited (in dollars per share)					14.51
Vested (in dollars per share)					4.80
Nonvested at the end of the period (in dollars per share)					$ 19.94	$ 13.05
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout of PSUs (percent of initial grant)					0%
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payout of PSUs (percent of initial grant)					200%

Stock-Based Compensation - Othe

Stock-Based Compensation - Other Stock Grants (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2022	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Stock, Common Stock, Compensation, Value	$ 100
Stock Issued During Period, Shares, New Issues		87,765
Share-Based Compensation Arrangement by Share-Based Payment Award, Per Share Weighted Average Price of Shares Issued		$ 5.40
Compensation Arrangement with Individual, Compensation Expense	$ 500

Financial Instruments - Narrati

Financial Instruments - Narrative (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) country	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Feb. 28, 2023 USD ($)
Guarantor Obligations [Line Items]
Derivatives liability resulted from netting arrangement	$ (100,000)	$ (900,000)
Pre-tax gains (losses)	2,600,000	2,700,000	$ 400,000
Fair value of long-term debt	1,227,600,000	1,394,200,000
Long-term Debt, Gross	1,364,161,000	$ 1,387,889,000
Term Loan
Guarantor Obligations [Line Items]
Principle amount	$ 200,000,000
Term Loan | Subsequent Event
Guarantor Obligations [Line Items]
Principle amount				$ 300,000,000
LIBOR | Fixed-Rate Term Loan | Term Loan
Guarantor Obligations [Line Items]
Basis spread on variable rate	3.12%	2.71%
Foreign currency exchange forward contracts
Guarantor Obligations [Line Items]
Notional amounts	$ 573,800,000	$ 425,800,000
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	$ 500,400,000	519,400,000	$ 410,600,000
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%
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

Financial Instruments - Fair Va

Financial Instruments - Fair Value of Outstanding Derivative Contracts Recorded as Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Asset derivatives (Level 2):	$ 3,196	$ 2,124
Liability derivatives (Level 2)	5,373	7,622
Foreign currency exchange forward contracts | Other current assets
Derivatives, Fair Value [Line Items]
Asset derivatives (Level 2):	3,196	2,124
Foreign currency exchange forward contracts | Other current liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives (Level 2)	5,373	3,465
Interest rate swaps | Other current liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives (Level 2)		4,157
Fair Value of Derivatives Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset derivatives (Level 2):	1,042	719
Liability derivatives (Level 2)	577	4,717
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):	1,042	719
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)	577	560
Fair Value of Derivatives Designated as Hedging Instruments | Interest rate swaps | Other current liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives (Level 2)		4,157
Fair Value of Derivatives Not Designated as Hedging Instruments
Derivatives, Fair Value [Line Items]
Asset derivatives (Level 2):	2,154	1,405
Liability derivatives (Level 2)	4,796	2,905
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):	2,154	1,405
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)	$ 4,796	2,905
Fair Value of Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Other current liabilities
Derivatives, Fair Value [Line Items]
Liability derivatives (Level 2)		$ 0

Financial Instruments - Effect

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, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Interest expense	$ (75,156)	$ (63,235)	$ (58,196)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax			20,350
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	2,499	3,345	(2,578)
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	19,808	10,761	(9,052)
Interest rate swaps | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(4,245)	(3,474)	(2,589)
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
Cross-currency interest rate swaps | Interest expense
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	0	(1,015)
Cross-currency 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
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	$ (1,746)
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		$ 129	$ 1,026

Financial Instruments - Effec_2

Financial Instruments - Effect of Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	$ 1,966	$ 267
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax			$ (4,780)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	(2,499)	(3,345)	2,578
Foreign Exchange Forward Two [Member]
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	1,966	309
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax			(930)
Interest Rate Swap Two [Member]
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	0	(42)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax			(3,889)
Cross-currency interest rate swaps
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	0	0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax			39
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
Discontinued Operation, Gain (Loss) From Disposal Of Discontinued Operation [Member] | Cross-currency interest rate swaps
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax			0
Interest expense | Interest rate swaps
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	4,245	3,474	2,589
Interest expense | Cross-currency interest rate swaps
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	0	1,015
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	$ 1,746	$ 129	$ (1,026)

Information by Segment and Ge_3

Information by Segment and Geographic Area (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Customer segment	Dec. 31, 2021 USD ($) Customer	Dec. 31, 2020 USD ($) Customer
Revenue, Major Customer [Line Items]
Revenues	$ 1,889,065	$ 1,848,399	$ 1,534,033
Number of reportable segments | segment	2
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	$ 813,710	$ 839,710	$ 703,334
U.S. Plans
Revenue, Major Customer [Line Items]
Revenues	$ 1,075,355	$ 1,008,689	$ 830,699

Information by Segment and Ge_4

Information by Segment and Geographic Area (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 656,875	$ 653,913
Percent of Revenue , Unaffiliated Customer	10%
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 283,864	267,174
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	96,095	108,496
All Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Property, plant and equipment, net	$ 276,916	$ 278,243

Information by Segment and Ge_5

Information by Segment and Geographic Area (Details 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 1,889,065	$ 1,848,399	$ 1,534,033
Operating income from continuing operations	(57,343)	88,376	(3,306)
Total assets	2,790,854	3,053,908	2,993,287
Depreciation	129,712	131,449	125,765
Depreciation Excluding Industrial Segment	129,712	127,402	120,443
Amortization	34,137	35,224	33,937
Amortization Excluding Deferred Financing Costs	34,137	34,942	33,600
Capital Expenditures	135,542	156,920	112,156
Interest income	3,559	2,231	2,129
Interest expense	(75,156)	(63,235)	(58,196)
Defined benefit pension income (expense)	8,938	15,640	7,073
Loss on early extinguishment of debt	(2,956)	(5,506)	(1,920)
Income (loss) from continuing operations before income taxes and equity income	(122,958)	37,506	(54,220)
Clean Earth
Segment Reporting Information [Line Items]
Operating income from continuing operations	(81,785)	25,639	16,096
Total assets	980,774	1,278,472	1,279,387
Depreciation	18,836	19,672	17,450
Amortization	24,299	24,180	22,814
Capital Expenditures	21,996	18,403	12,612
Operating segments
Segment Reporting Information [Line Items]
Operating income from continuing operations	(22,226)	129,041	75,102
Operating segments | Harsco Environmental
Segment Reporting Information [Line Items]
Revenues	1,061,239	1,068,083	914,445
Operating income from continuing operations	59,559	103,402	59,006
Total assets	1,416,717	1,386,087	1,322,731
Depreciation	108,880	105,830	100,971
Amortization	6,809	8,052	7,825
Capital Expenditures	109,508	137,228	99,056
Operating segments | Clean Earth
Segment Reporting Information [Line Items]
Revenues	827,826	780,316	619,588
Operating segments | Harsco Industrial
Segment Reporting Information [Line Items]
Total assets	336,245	333,263	316,984
Corporate
Segment Reporting Information [Line Items]
Operating income from continuing operations	(35,117)	(40,665)	(78,408)
Total assets	57,118	56,086	74,185
Depreciation	1,996	1,900	2,022
Amortization	3,029	2,710	2,961
Capital Expenditures	$ 4,038	$ 1,289	$ 488

Revenue Recognition - Summary o

Revenue Recognition - Summary of Revenues by Primary Geographical Markets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total revenues	$ 1,889,065	$ 1,848,399	$ 1,534,033
Environmental services related to resource recovery for metals manufacturing; and related logistical services
Disaggregation of Revenue [Line Items]
Total revenues	900,426	920,580	781,060
Applied Products [Member]
Disaggregation of Revenue [Line Items]
Total revenues	145,911	132,389	120,432
Aluminum Dross and Scrap Processing Systems [Member]
Disaggregation of Revenue [Line Items]
Total revenues	14,902	15,114	12,953
Waste Processing and Reuse Solutions [Member]
Disaggregation of Revenue [Line Items]
Total revenues	681,804	639,233	472,631
Soil and dredged material
Disaggregation of Revenue [Line Items]
Total revenues	146,022	141,083	146,957
North America
Disaggregation of Revenue [Line Items]
Total revenues	1,125,370	1,061,441	869,492
Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	389,713	442,286	377,066
Latin America
Disaggregation of Revenue [Line Items]
Total revenues	155,235	132,349	119,457
Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	119,433	110,790	87,608
Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	79,562	81,337	63,427
Eastern Europe
Disaggregation of Revenue [Line Items]
Total revenues	19,752	20,196	16,983
Harsco Environmental | Operating segments
Disaggregation of Revenue [Line Items]
Total revenues	1,061,239	1,068,083	914,445
Harsco Environmental | Operating segments | Environmental services related to resource recovery for metals manufacturing; and related logistical services
Disaggregation of Revenue [Line Items]
Total revenues	900,426	920,580	781,060
Harsco Environmental | Operating segments | Applied Products [Member]
Disaggregation of Revenue [Line Items]
Total revenues	145,911	132,389	120,432
Harsco Environmental | Operating segments | Aluminum Dross and Scrap Processing Systems [Member]
Disaggregation of Revenue [Line Items]
Total revenues	14,902	15,114	12,953
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	297,544	281,125	249,904
Harsco Environmental | Operating segments | Western Europe
Disaggregation of Revenue [Line Items]
Total revenues	389,713	442,286	377,066
Harsco Environmental | Operating segments | Latin America
Disaggregation of Revenue [Line Items]
Total revenues	155,235	132,349	119,457
Harsco Environmental | Operating segments | Asia-Pacific
Disaggregation of Revenue [Line Items]
Total revenues	119,433	110,790	87,608
Harsco Environmental | Operating segments | Middle East and Africa
Disaggregation of Revenue [Line Items]
Total revenues	79,562	81,337	63,427
Harsco Environmental | Operating segments | Eastern Europe
Disaggregation of Revenue [Line Items]
Total revenues	19,752	20,196	16,983
Clean Earth | Operating segments
Disaggregation of Revenue [Line Items]
Total revenues	827,826	780,316	619,588
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	681,804	639,233	472,631
Clean Earth | Operating segments | Soil and dredged material
Disaggregation of Revenue [Line Items]
Total revenues	146,022	141,083	146,957
Clean Earth | Operating segments | North America
Disaggregation of Revenue [Line Items]
Total revenues	827,826	780,316	619,588
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

Revenue Recognition - Narrative

Revenue Recognition - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Total contract assets	$ 5,300	$ 3,100
Revenue recognized in excess of amounts reclassified to trade accounts receivable, net	6,800	4,100
Contract with Customer, Liability, Revenue Recognized	18,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	1,889,065	1,848,399	$ 1,534,033
Waste Processing and Reuse Solutions [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	681,804	639,233	472,631
Aluminum Dross and Scrap Processing Systems [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	14,902	15,114	12,953
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	900,426	920,580	781,060
Applied Products [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	145,911	132,389	120,432
Soil and dredged material
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	146,022	141,083	146,957
Operating Segments [Member] | Clean Earth
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	827,826	780,316	619,588
Operating Segments [Member] | Harsco Environmental
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	1,061,239	1,068,083	914,445
Operating Segments [Member] | Waste Processing and Reuse Solutions [Member] | Clean Earth
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	681,804	639,233	472,631
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	14,902	15,114	12,953
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	900,426	920,580	781,060
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	145,911	132,389	120,432
Operating Segments [Member] | Soil and dredged material | Clean Earth
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	146,022	141,083	146,957
Operating Segments [Member] | Soil and dredged material | Harsco Environmental
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Product revenues	$ 0	$ 0	$ 0

Revenue Recognition - Performan

Revenue Recognition - Performance Obligation Period Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Harsco Environmental
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligation	$ 75.7
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	21.1
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	20.9
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	18.3
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	$ 7.2
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

Other Expenses (Details)

Other Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Net gains	$ (4,013)	$ (8,902)	$ (3,723)
Employee termination benefit costs	6,490	4,766	10,249
Costs to exit activities	1,446	663	533
Impaired asset write-downs	641	1,005	776
Contingent Consideration Adjustments	827	0	(2,386)
Other expense	1,000	(1,254)	(149)
Total	4,737	(3,722)	10,072
Corporate
Segment Reporting Information [Line Items]
Net gains	(632)	0	0
Employee termination benefit costs	(294)	1,481	27
Costs to exit activities	1,407	0	29
Contingent Consideration Adjustments	0	0	(2,274)
Clean Earth
Segment Reporting Information [Line Items]
Net gains	(1,512)	0	0
Employee termination benefit costs	1,786	433	833
Costs to exit activities	0	23	0
Impaired asset write-downs	59	63	0
Contingent Consideration Adjustments	(827)	0	(112)
Harsco Environmental
Segment Reporting Information [Line Items]
Net gains	(1,869)	(8,902)	(3,723)
Employee termination benefit costs	4,998	2,852	9,389
Costs to exit activities	39	640	504
Impaired asset write-downs	582	942	776
Contingent Consideration Adjustments	$ 0	$ 0	$ 0

Components of Accumulated Oth_3

Components of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances	$ 805,770	$ 713,399	$ 789,659
OCI before reclassifications	(30,317)	58,995
Amounts reclassified from AOCI, net of tax	18,710	25,110
Other Comprehensive Income (Loss), Net of Tax, Total	(11,607)	84,105	(55,307)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	4,110	1,497
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	(7,497)	85,602
Balances	623,042	805,770	713,399
Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances		(645,741)
Balances			(645,741)
Accumulated Foreign Currency Adjustment Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances	(134,889)
OCI before reclassifications	(82,325)	(10,994)
Amounts reclassified from AOCI, net of tax	0	0
Other Comprehensive Income (Loss), Net of Tax, Total	(82,325)	(10,994)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	4,110	1,497
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total	(78,215)	(9,497)
Balances	(213,104)	(134,889)
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		(125,392)
Balances			(125,392)
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances	(3,024)
OCI before reclassifications	1,642	441
Amounts reclassified from AOCI, net of tax	1,539	2,375
Other Comprehensive Income (Loss), Net of Tax, Total	3,181	2,816
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	3,181	2,816
Balances	157	(3,024)
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		(5,840)
Balances			(5,840)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances	(422,248)
OCI before reclassifications	50,378	69,517
Amounts reclassified from AOCI, net of tax	17,171	22,735
Other Comprehensive Income (Loss), Net of Tax, Total	67,549	92,252
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	67,549	92,252
Balances	(354,699)	(422,248)
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		(514,500)
Balances			(514,500)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances	22
OCI before reclassifications	(12)	31
Amounts reclassified from AOCI, net of tax	0	0
Other Comprehensive Income (Loss), Net of Tax, Total	(12)	31
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	(12)	31
Balances	10	22
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		(9)
Balances			(9)
Total
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balances	(560,139)	(645,741)	(587,622)
Other Comprehensive Income (Loss), Net of Tax, Total	(7,497)	85,602	(58,119)
Balances	$ (567,636)	$ (560,139)	$ (645,741)

Components of Accumulated Oth_4

Components of Accumulated Other Comprehensive Loss (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Revenues	$ 1,889,065	$ 1,848,399	$ 1,534,033
Interest expense	(75,156)	(63,235)	(58,196)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax			20,350
Total costs and expenses	1,946,408	1,760,023	1,537,339
Income from continuing operations before income taxes	(122,958)	37,506	(54,220)
Income Tax Expense (Benefit)	10,381	9,089	(8,673)
Net income (loss)	176,431	(2,729)	21,975
Other Operating Income (Expense), Net	(4,737)	3,722	$ (10,072)
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	18,389	24,167
Income Tax Expense (Benefit)	(1,218)	(1,432)
Net income (loss)	17,171	22,735
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)	(33)	0
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)	96	(72)
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)	17,792	23,657
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)	(960)	(970)
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)	534	582
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	(1,746)	(129)
Income from continuing operations before income taxes	2,499	3,345
Net income (loss)	1,539	2,375
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	$ (4,245)	$ (3,474)

SCHEDULE II. VALUATION AND QU_2

SCHEDULE II. VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Accrued Environmental Loss Contingencies, Noncurrent	$ 26,880	$ 28,435
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	11,654	7,488	$ 13,265
Charged to Cost and Expenses	403	589	1,961
Due to Currency Translation Adjustments	(110)	(206)	(104)
Other	(3,600)	3,783	(7,634)
Balance at End of Period	8,347	11,654	7,488
Deferred Tax Assets - Valuation Allowance
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	92,385	108,563	100,245
Charged to Cost and Expenses	14,126	(4,252)	6,936
Due to Currency Translation Adjustments	(6,448)	(3,502)	1,305
Other	(10,829)	(8,424)	77
Balance at End of Period	89,234	92,385	$ 108,563
Valuation Allowance, Tax Credit Carryforward
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Decrease in valuation allowance		(15,500)
Pension Adjustments
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Decrease in valuation allowance	(19,300)	(13,000)
Tax Rate Change
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Decrease in valuation allowance	$ (14,400)	$ (3,700)