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Accounts Receivable (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Jan. 01, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Trade accounts receivable $ 434,295,000 $ 414,891,000  
Accounts Receivable Greater than 12 Months Reserved 7,200,000    
Receivable with Imputed Interest, Face Amount $ 40,000,000    
Note Receivable; Interest Rate; Stated percentage 2.50%    
Receivables, Fair Value Disclosure $ 31,800,000   $ 34,300,000
Proceeds from Collection of Notes Receivable 6,400,000    
Greater than 12 months      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Trade accounts receivable $ 12,000,000    
Harsco Industrial IKG | Disposal Group, Disposed of by Sale, Not Discontinued Operations      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Selling price     $ 85,000,000