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Components of Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Inventory Disclosure [Line Items]    
Raw materials and supplies $ 71.7 $ 49.6
Work in process 22.4 11.3
Finished goods 148.1 139.8
Total $ 242.2 $ 200.7