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Acquisitions - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jul. 01, 2019
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]        
Goodwill acquired     $ 2.5 $ 13.9
PWE        
Business Acquisition [Line Items]        
Purchase price, inclusive of preliminary working capital adjustment     6.2  
Goodwill acquired     $ 2.5  
MRL        
Business Acquisition [Line Items]        
Purchase price, inclusive of preliminary working capital adjustment $ 49.8      
Goodwill acquired [1] 13.9      
Business acquisition purchase price adjustment   $ 0.8    
Contingent consideration maximum $ 15.5      
[1] Goodwill, the majority of which is tax-deductible, has been allocated to the Environmental Solutions Group on the basis that the synergies identified will primarily benefit this segment.