Acquisitions and Dispositions - Schedule of Income (Loss) from Discontinued Operations Harsco Rail (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues			$ 2,342,645	$ 2,366,020	$ 2,133,981
Cost of services and products sold					1,799,483
Selling, general and administrative costs			359,388	353,985	304,865
Research and development expenses			3,961	3,458	2,858
Other Operating Income (Expense), Net			(5,437)	1,591	(11,654)
Total costs and expenses			2,310,900	2,286,082	2,234,877
Operating income from continuing operations			31,745	79,938	(100,896)
Interest income			6,795	6,809	3,829
Interest Expense, Operating and Nonoperating			112,217	107,081	76,807
Defined benefit pension income (expense)			16,728	21,574	(8,933)
Income from continuing operations before income taxes			(101,670)	(52,670)	(167,897)
Income Tax Expense (Benefit)			17,066	30,866	4,856
Income from continuing operations			(118,746)	(84,297)	(172,931)
Revision of Prior Period, Adjustment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cost of services and products sold	$ 282,469		242,584
Revision of Prior Period, Adjustment | Harsco Rail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues	296,795			244,916
Selling, general and administrative costs	41,602			36,799
Research and development expenses	2,172			2,168
Other Operating Income (Expense), Net	1,628			6,917
Total costs and expenses	327,871			288,468
Operating income from continuing operations	(31,076)			(43,552)
Interest income	139			270
Interest Expense, Operating and Nonoperating	(3,209)			(1,651)
Defined benefit pension income (expense)	26			(5)
Income from continuing operations before income taxes	(34,120)			(44,938)
Income Tax Expense (Benefit)	(2,681)			5,525
Income from continuing operations	$ (36,801)			(39,413)
Services
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues			1,970,193	1,931,712	1,757,583
Cost of services and products sold			1,557,473	1,511,689	1,438,421
Services | Revision of Prior Period, Adjustment | Harsco Rail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues		$ 52,430		29,331
Cost of services and products sold		34,552		19,550
Product
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues			372,452	434,308	376,398
Cost of services and products sold			$ 345,114	404,442	$ 357,499
Product | Revision of Prior Period, Adjustment | Harsco Rail
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total revenues		244,365		215,585
Cost of services and products sold		$ 247,917		$ 223,034