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Inventories - Components of Inventories (Detail) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Inventory Net [Abstract]    
Raw materials and manufacturing supplies $ 268.4 $ 261.7
Work in process 193.4 157.5
Finished goods 271.9 260.6
LIFO reserve (93.8) (93.6)
Total $ 639.9 $ 586.2