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Inventories - Components of Inventories (Detail) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Inventory Net [Abstract]    
Raw materials and manufacturing supplies $ 245.9 $ 247.2
Work in process 167.0 156.1
Finished goods 269.7 275.2
LIFO reserve (85.8) (86.5)
Total $ 596.8 $ 592.0