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Components of Inventories (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Inventory, Finished Goods and Work in Process, Net of Reserves [Abstract]    
Raw materials and supplies $ 67.9 $ 71.7
Work in process 24.3 22.4
Finished goods 166.9 148.1
Total $ 259.1 $ 242.2