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Inventories (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Inventories, net:    
Manufacturing supplies $ 56.6 $ 64.3
Raw materials 79.4 110.7
Work in process 284.2 278.1
Finished products 423.4 430.4
Subtotal 843.6 883.5
Allowance for obsolete and surplus inventory (25.0) (21.4)
Total Inventories, net $ 818.6 $ 862.1