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Revenues - Disaggregation of Revenue by Product Line (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Disaggregation of Revenue [Line Items]        
Net sales $ 270.6 $ 352.8 $ 558.8 $ 629.6
Performance Materials segment        
Disaggregation of Revenue [Line Items]        
Net sales 84.4 123.1 205.5 232.2
Performance Materials segment | Automotive Technologies product line        
Disaggregation of Revenue [Line Items]        
Net sales 74.7 113.9 187.6 213.6
Performance Materials segment | Process Purification product line        
Disaggregation of Revenue [Line Items]        
Net sales 9.7 9.2 17.9 18.6
Performance Chemicals segment        
Disaggregation of Revenue [Line Items]        
Net sales 186.2 229.7 353.3 397.4
Performance Chemicals segment | Oilfield Technologies product line        
Disaggregation of Revenue [Line Items]        
Net sales 14.2 29.7 44.4 58.9
Performance Chemicals segment | Pavement Technologies product line        
Disaggregation of Revenue [Line Items]        
Net sales 63.9 64.6 84.6 83.1
Performance Chemicals segment | Industrial Specialties product line        
Disaggregation of Revenue [Line Items]        
Net sales 76.5 101.1 156.4 196.9
Performance Chemicals segment | Engineered Polymers product line        
Disaggregation of Revenue [Line Items]        
Net sales $ 31.6 $ 34.3 $ 67.9 $ 58.5