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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]    
Finished goods $ 357.7 $ 430.4
Work in process 584.7 518.8
Raw materials, supplies and other 327.8 206.9
First-in, first-out inventory 1,270.2 1,156.1
Less: Excess of first-in, first-out cost over last-in, first-out cost (133.1) (130.6)
Net inventories $ 1,137.1 $ 1,025.5