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Inventories, Net - Schedule of Inventories, Net (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 68.7 $ 75.9
Work in process 22.3 21.1
Finished products 195.7 232.4
Supplies 56.8 57.8
Total $ 343.5 $ 387.2