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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Inventories, net:    
Manufacturing supplies $ 29.6 $ 24.7
Raw materials 55.6 58.8
Work in process 186.3 181.9
Finished products 306.9 296.2
Subtotal 578.4 561.6
Allowance for obsolete and surplus inventory (23.0) (18.4)
Total Inventories, net $ 555.4 $ 543.2