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Inventories, Net - Inventories, Net (Detail) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Inventory [Line Items]    
Raw materials $ 97.8 $ 136.4
Work in process 50.1 48.5
Finished products 221.8 273.5
Supplies (chemicals) 80.4 79.8
Total 450.1 538.2
Chemicals    
Inventory [Line Items]    
Raw materials 93.4 133.2
Work in process 37.7 36.8
Finished products 218.7 270.0
Component Products    
Inventory [Line Items]    
Raw materials 4.4 3.2
Work in process 12.4 11.7
Finished products $ 3.1 $ 3.5