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Acquisitions and Dispositions - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Aug. 29, 2024
Apr. 01, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2024
Business Acquisition [Line Items]              
Contract estimated forward loss provision for Harsco Rail Segment       $ 32,700 $ 32,800 $ 44,500  
Gain (Loss) on Disposition of Business       10,478 0 $ 0  
Revolving Credit Facility | Line of Credit [Member]              
Business Acquisition [Line Items]              
Unamortized Debt Issuance Expense     $ 4,400 $ 4,400      
Harsco Rail              
Business Acquisition [Line Items]              
Increase (Decrease) in Carrying Amount of Assets             $ 10,700
SBB              
Business Acquisition [Line Items]              
Percentage Complete     91.00% 91.00%      
Contract estimated forward loss provision for Harsco Rail Segment         7,300    
Network Rail              
Business Acquisition [Line Items]              
Contract estimated forward loss provision for Harsco Rail Segment     $ 2,800 $ 16,100 14,400    
Network Rail | Contract 2              
Business Acquisition [Line Items]              
Percentage Complete     64.00% 64.00%      
Deutsche Bahn              
Business Acquisition [Line Items]              
Percentage Complete     48.00% 48.00%      
Contract estimated forward loss provision for Harsco Rail Segment     $ 7,200 $ 14,400 39,900    
Harsco Rail | Discontinued Operations, Held-for-sale              
Business Acquisition [Line Items]              
Goodwill         13,026    
Accounts payable         $ 44,703    
Performix Metallurgical Additives, LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations              
Business Acquisition [Line Items]              
Gain (Loss) on Disposition of Business   $ 1,800          
Gain (Loss) On Disposition Of Business, Net Of Tax   1,300          
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net $ 4,700            
Goodwill 5,300            
Proceeds from Divestiture of Businesses, Gross   $ 17,500          
Reed Minerals, LLC | Disposal Group, Disposed of by Sale, Not Discontinued Operations              
Business Acquisition [Line Items]              
Gain (Loss) on Disposition of Business 8,700            
Gain (Loss) On Disposition Of Business, Net Of Tax 2,800            
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net 9,900            
Goodwill 13,700            
Proceeds from Divestiture of Businesses, Gross 45,000            
Disposal Group, Including Discontinued Operation, Inventory 7,100            
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment 10,700            
Accounts payable $ 6,900