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Components of Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Inventories [Line Items]    
Raw materials and manufacturing supplies $ 215.0 $ 214.2
Work in process 157.2 158.8
Finished goods 214.2 229.3
LIFO reserve (93.1) (92.1)
Total $ 493.3 $ 510.2