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Inventories, Net - Schedule of Inventories, Net (Detail) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Raw materials $ 137.0 $ 93.1
Work in process 27.3 23.5
Finished products 256.6 316.8
Supplies 67.7 64.5
Total $ 488.6 $ 497.9