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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Finished goods $ 132.8 $ 372.2
Work in process 920.7 559.4
Raw materials, supplies and other 217.6 217.3
First-in, first-out inventory 1,271.1 1,148.9
Less: Excess of first-in, first-out cost over last-in, first-out cost (132.6) (131.9)
Net inventories $ 1,138.5 $ 1,017.0