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Inventories, Net - Schedule of Inventories, Net (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 60.1 $ 75.9
Work in process 25.4 21.1
Finished products 170.5 232.4
Supplies 61.1 57.8
Total $ 317.1 $ 387.2