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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished goods $ 146.3 $ 151.7
Raw materials and precious metals 94.1 98.4
In-process inventories 38.9 23.9
Parts and supplies 74.6 75.2
Total Inventories $ 353.9 $ 349.2