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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Inventory Disclosure [Abstract]    
Finished goods $ 362.4 $ 275.2
Raw materials and precious metals 194.6 164.3
In-process inventories 78.5 42.8
Parts and supplies 44.8 45.8
Inventories $ 680.3 $ 528.1