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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 52.3 $ 40.9
Work in process 22.7 23.9
Finished goods 56.1 44.9
Supplies and other 10.6 9.7
Total $ 141.7 $ 119.4