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Inventories, Net - Schedule of Inventories, Net (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Inventory Disclosure [Abstract]    
Raw materials $ 105.4 $ 106.9
Work in process 37.1 20.8
Finished products 219.8 191.5
Supplies 67.9 63.1
Total $ 430.2 $ 382.3