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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 50.4 $ 40.9
Work in process 21.3 23.9
Finished goods 74.2 44.9
Supplies and other 9.3 9.7
Total $ 155.2 $ 119.4