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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Finished goods $ 74.6 $ 70.9
Work in process 27.1 23.6
Raw materials 71.8 67.7
Total inventories $ 173.5 $ 162.2