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Inventories - Components of Inventories (Detail) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Inventory Net [Abstract]    
Raw materials and manufacturing supplies $ 250.4 $ 247.2
Work in process 202.6 156.1
Finished goods 281.1 275.2
LIFO reserve (83.0) (86.5)
Total $ 651.1 $ 592.0