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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Inventories, net:    
Manufacturing supplies $ 31.9 $ 32.4
Raw materials 102.4 102.4
Work in process 289.0 287.7
Inventory, Finished Goods, Gross 426.5 452.7
Subtotal 849.8 875.2
Allowance for obsolete and surplus inventory (44.5) (39.5)
Total Inventories, net $ 805.3 $ 835.7