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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Finished goods $ 140.9 $ 114.5
Raw materials and precious metals 96.0 81.2
In-process inventories 14.6 35.8
Parts and supplies 71.5 58.4
Total Inventories $ 323.0 $ 289.9