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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Raw materials $ 49.7 $ 40.9
Work in process 21.5 23.9
Finished goods 54.7 44.9
Supplies and other 10.9 9.7
Total $ 136.8 $ 119.4