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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Finished goods $ 268.0 $ 268.2
Raw materials and precious metals 179.5 177.0
In-process inventories 51.9 36.9
Parts and supplies 43.7 44.5
Inventories $ 543.1 $ 526.6