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Revenue - Disaggregation of Sales - Schedule of Disaggregates of Net Sales of our Chemicals Segment (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Disaggregation Of Revenue [Line Items]        
Net sales $ 578.9 $ 458.6 $ 1,613.2 $ 1,332.9
Chemicals        
Disaggregation Of Revenue [Line Items]        
Net sales 499.8 416.9 1,443.4 1,223.9
Point of Origin | Chemicals        
Disaggregation Of Revenue [Line Items]        
Net sales 499.8 416.9 1,443.4 1,223.9
Point of Origin | Chemicals | United States        
Disaggregation Of Revenue [Line Items]        
Net sales 297.6 272.9 787.5 736.5
Point of Origin | Chemicals | Germany        
Disaggregation Of Revenue [Line Items]        
Net sales 254.2 208.1 724.2 620.3
Point of Origin | Chemicals | Canada        
Disaggregation Of Revenue [Line Items]        
Net sales 88.6 93.8 288.8 247.1
Point of Origin | Chemicals | Belgium        
Disaggregation Of Revenue [Line Items]        
Net sales 69.6 64.9 212.0 181.9
Point of Origin | Chemicals | Norway        
Disaggregation Of Revenue [Line Items]        
Net sales 63.4 46.6 198.5 163.5
Point of Origin | Chemicals | Eliminations        
Disaggregation Of Revenue [Line Items]        
Net sales (273.6) (269.4) (767.6) (725.4)
Point of Destination | Chemicals        
Disaggregation Of Revenue [Line Items]        
Net sales 499.8 416.9 1,443.4 1,223.9
Point of Destination | Chemicals | Europe        
Disaggregation Of Revenue [Line Items]        
Net sales 248.0 194.3 712.1 578.6
Point of Destination | Chemicals | North America        
Disaggregation Of Revenue [Line Items]        
Net sales 174.3 153.2 476.9 434.4
Point of Destination | Chemicals | Other        
Disaggregation Of Revenue [Line Items]        
Net sales $ 77.5 $ 69.4 $ 254.4 $ 210.9