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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 33.1 $ 35.1
Work in process 19.8 17.4
Finished goods 39.4 40.4
Supplies and other 13.8 15.5
Total $ 106.1 $ 108.4