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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Inventories, net:    
Manufacturing supplies $ 25.7 $ 26.8
Raw materials 57.0 62.3
Work in process 227.4 199.2
Finished products 332.9 312.7
Subtotal 643.0 601.0
Allowance for obsolete and surplus inventory (24.7) (18.4)
Total Inventories, net $ 618.3 $ 582.6