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Inventories, Net - Schedule of Inventories, Net (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 100.7 $ 133.2
Work in process 29.8 36.8
Finished products 213.9 269.2
Supplies 79.2 79.8
Total $ 423.6 $ 519.0