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Inventories Components of Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 271.5 $ 261.9
Work in process 13.9 11.3
Finished goods 206.3 216.3
Supplies and materials 204.2 175.4
Inventories $ 695.9 $ 664.9