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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished goods $ 172.0 $ 151.7
Raw materials and precious metals 113.8 98.4
In-process inventories 22.4 23.9
Parts and supplies 77.0 75.2
Total Inventories $ 385.2 $ 349.2