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Information by Segment and Geographic Area
 12 Months Ended
Dec. 31, 2025
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 2025, the Company had three reportable segments. These segments and the types of products and services offered include the following:

Harsco Environmental
HE is a global provider of on-site environmental services for the management of waste and byproduct streams from our customers, which includes resource recovery and recycling of waste materials, materials handling and logistical support and aluminum dross and scrap management. HE also manufactures value-added downstream products from industrial waste streams, or ecoproducts, which includes road surfacing materials, metallurgical additives, agriculture and turf products and cement additives.

Clean Earth
CE provides specialty waste processing solutions for customers in the industrial, retail, healthcare and construction industries in the U.S. CE's services include the treatment, recycling and beneficial reuse of hazardous and non-hazardous wastes and the processing of contaminated soil and dredged materials.

Harsco Rail
Rail is a global provider of railway track maintenance equipment and services. Rail's products include highly engineered railway track maintenance equipment, aftermarket parts and safety and diagnostics technology systems. In addition, Rail provides railway maintenance services to major railways, mass transit systems and equipment leasing companies.

Information by Geographical Areas
Countries with revenues from unaffiliated customers or net PP&E of 10% or more of the consolidated totals for at least one of the periods presented below are as follows:
 Revenues from Unaffiliated Customers
  Years ended December 31
(In thousands)202520242023
By geographic location (a):
U.S.$1,283,489 $1,341,287 $1,405,398 
International
956,869 1,001,850 960,789 
Total revenues from unaffiliated customers$2,240,358 $2,343,137 $2,366,187 
(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)20252024
By geographic location:
U.S.$362,085 $338,679 
International
337,579 325,613 
Total property, plant and equipment, net$699,664 $664,292 

No customer provided in excess of 10% of the Company's consolidated revenues in 2025, 2024 and 2023.
In 2025, 2024 and 2023, HE had one customer that provided in excess of 10% of its revenues under multiple long-term contracts at several mill sites. Should additional consolidations occur involving some of the steel industry's larger companies which are customers of the Company, it would result in an increase in concentration of credit risk for the Company. The loss of these 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 2025, 2024, and 2023, CE had one customer that provided in excess of 10% of its revenue. The loss of this customer would not have a material adverse impact on the Company's financial positions or cash flows; however, it could have a material effect on quarterly or annual results of operations.

In 2025 and 2024, Rail had two customers that provided more than 10% of the segment total revenues and, in 2023, Rail had one customer that provided more than 10% of the segment total revenues. The loss of either 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
The accounting policies for the three reportable segments are consistently applied, as described in Note 1, Summary of Significant Accounting Policies. The Company's chief operating decision maker (the "CODM") is the Company's Chairman and Chief Executive Officer. The CODM uses segment operating income/(loss) from continuing operations as the profit measure to evaluate segment performance and allocate resources across segments. Corporate unallocated expenses, interest income, interest expense, facility fees and debt-related income (expense) and defined benefit pension income (expense) are centrally managed costs and are, therefore, excluded from this profit measure to provide better understanding of the Company's segment operating results. The CODM considers variances of actual performance to the Company's annual operating plan and periodic forecasts when making decisions.
The following tables include information about the Company's revenues and operating income (loss) by reporting segment, along with significant segment expenses and other segment information, for the years ended December 31, 2025, 2024 and 2023:

Year Ended December 31, 2025
(in thousands)Harsco
Environmental
Clean
Earth
Harsco
Rail
Total SegmentCorporate
Total
Segment Profit and Loss:
Total revenues1,019,411 973,853 247,094 $2,240,358 — $2,240,358 
Less:
Cost of services and products sold (a)
857,777 711,666 251,108 1,820,551 155 1,820,706 
Selling, general and administrative expenses105,402 169,728 46,953 322,083 59,922 382,005 
Property, plant and equipment impairment charge7,797 — — 7,797 — 7,797 
Other segment items (a)(b)
6,258 797 6,410 13,465 12,136 25,601 
Operating income (loss) from continuing operations42,177 91,662 (57,377)$76,462 (72,213)$4,249 
Plus:
Interest income2,191 
Interest expense(110,962)
Facility fees and debt-related income (expense)(10,662)
Defined benefit pension income (expense)(21,635)
Income (loss) from continuing operations before income taxes and equity income$(136,819)
Other Segment Information:
Depreciation
108,168 39,778 4,464 $152,410 972 $153,382 
Amortization (c)
2,242 23,644 713 $26,599 3,976 $30,575 
Capital expenditures
84,494 49,459 7,117 $141,070 209 $141,279 
Total assets
1,329,132 1,036,916 333,383 $2,699,431 9,240 $2,708,671 
Year Ended December 31, 2024
(in thousands)Harsco
Environmental		Clean
Earth		Harsco
Rail		Total SegmentCorporateTotal
 Segment Profit and Loss:
Total revenues1,111,512 940,337 291,288 $2,343,137 — $2,343,137 
Less:
Cost of services and products sold (a)
948,591 690,160 271,853 1,910,604 — 1,910,604 
Selling, general and administrative expenses113,845 156,378 48,461 318,684 40,704 359,388 
Goodwill and other intangible asset impairment charges2,840 — 13,026 15,866 — 15,866 
Property, plant and equipment impairment charge23,444 — — 23,444 — 23,444 
Remeasurement of long-lived assets— — 10,695 10,695 — 10,695 
Gain on sale of businesses, net(10,029)— — (10,029)(449)(10,478)
Other segment items (a)(b)
808 1,151 6,808 8,767 (5,863)2,904 
Operating income (loss) from continuing operations32,013 92,648 (59,555)$65,106 (34,392)$30,714 
Plus:
Interest income6,795 
Interest expense(112,217)
Facility fees and debt-related income (expense)(11,265)
Defined benefit pension income (expense)(17,607)
Income (loss) from continuing operations before income taxes and equity income$(103,580)
Other Segment Information:
Depreciation
109,756 33,840 3,478 $147,074 1,255 $148,329 
Amortization (c)
3,068 23,976 224 $27,268 4,203 $31,471 
Capital expenditures
98,845 32,754 4,756 $136,355 236 $136,591 
Total assets
1,263,031 993,107 351,174 $2,607,312 27,199 $2,634,511 
Year Ended December 31, 2023
(in thousands)Harsco
Environmental		Clean
Earth		Harsco
Rail		Total SegmentCorporateTotal
 Segment Profit and Loss:
Total revenues1,141,935 927,457 296,795 $2,366,187 — $2,366,187 
Less:
Cost of services and products sold (a)942,219 694,164 270,996 1,907,379 — 1,907,379 
Selling, general and administrative expenses109,131 154,513 45,770 309,414 44,571 353,985 
Property, plant and equipment impairment charge14,099 — — 14,099 — 14,099 
Other segment items (a)(b)
(2,180)2,078 4,884 4,782 (1,571)3,211 
Operating income (loss) from continuing operations78,666 76,702 (24,855)$130,513 (43,000)$87,513 
Plus:
Interest income6,809 
Interest expense(107,081)
Facility fees and debt-related income (expense)(10,762)
Defined benefit pension income (expense)(22,326)
Income (loss) from continuing operations before income taxes and equity income$(45,847)
Other Segment Information:
Depreciation
113,571 23,252 — $136,823 2,133 $138,956 
Amortization (c)
4,030 24,583 — $28,613 3,795 $32,408 
Capital expenditures
104,045 32,100 2,453 $138,598 427 $139,025 
Total assets
1,417,278 979,871 369,931 $2,767,080 67,444 $2,834,524 
(a) Cost of services and products sold is a significant expense category provided to the CODM at the segment-level.
(b) Other segment activities include amounts reflected in the captions, Research and development costs, Cost of services and products sold and Other (income) expenses, net, on the Company's Consolidated Statements of Operations.
(c) Amortization expense in Corporate relates to the amortization of deferred financing costs.