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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 45.2 $ 35.1
Work in process 17.3 17.4
Finished goods 36.1 40.4
Supplies and other 13.8 15.5
Total $ 112.4 $ 108.4