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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Finished goods $ 467.3 $ 434.6
Work in process 850.3 621.9
Raw materials, supplies and other 204.6 165.7
First-in, first-out inventory 1,522.2 1,222.2
Less: Excess of first-in, first-out cost over last-in, first-out cost (124.1) (126.6)
Net inventories $ 1,398.1 $ 1,095.6