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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Inventory Disclosure [Abstract]    
Finished goods $ 272.5 $ 220.1
Work in process 247.0 219.3
Raw materials, supplies and other 222.5 166.7
First-in, first-out inventory 742.0 606.1
Less: Excess of first-in, first-out cost over last-in, first-out cost (127.2) (127.2)
Net inventories $ 614.8 $ 478.9