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Inventories, Net - Schedule of Inventories, Net (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 134.3 $ 124.4
Work in process 50.0 39.0
Finished products 246.9 269.9
Supplies 73.0 69.7
Total $ 504.2 $ 503.0