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Inventories Components of Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Inventory Disclosure [Abstract]    
Raw materials $ 254.2 $ 261.9
Work in process 13.0 11.3
Finished goods 208.3 216.3
Supplies and materials 192.0 175.4
Inventories $ 667.5 $ 664.9