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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Inventory Disclosure [Abstract]    
Raw materials $ 39.5 $ 45.2
Work in process 21.0 17.3
Finished goods 40.4 36.1
Supplies and other 10.0 13.8
Total $ 110.9 $ 112.4