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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Finished goods $ 131.8 $ 114.5
Raw materials and precious metals 102.3 81.2
In-process inventories 17.6 35.8
Parts and supplies 73.3 58.4
Total Inventories $ 325.0 $ 289.9