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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Inventory Disclosure [Abstract]    
Finished goods $ 289.4 $ 268.2
Raw materials and precious metals 152.5 177.0
In-process inventories 41.4 36.9
Parts and supplies 45.4 44.5
Inventories $ 528.7 $ 526.6