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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Inventories, net:    
Manufacturing supplies $ 29.5 $ 28.2
Raw materials 85.7 54.9
Work in process 238.4 182.9
Finished products 367.4 308.8
Subtotal 721.0 574.8
Allowance for obsolete and surplus inventory (33.5) (21.1)
Total Inventories, net $ 687.5 $ 553.7