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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 40.9 $ 45.2
Work in process 23.9 17.3
Finished goods 44.9 36.1
Supplies and other 9.7 13.8
Total $ 119.4 $ 112.4