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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Raw materials and manufacturing supplies $ 180.6 $ 154.2
Work in process 71.0 45.1
Finished goods 51.2 43.6
Total $ 302.8 $ 242.9