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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Inventories, net:    
Manufacturing supplies $ 27.8 $ 28.2
Raw materials 58.8 54.9
Work in process 197.2 182.9
Finished products 305.9 308.8
Subtotal 589.7 574.8
Allowance for obsolete and surplus inventory (23.5) (21.1)
Total Inventories, net $ 566.2 $ 553.7