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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 138.6 $ 92.1
Work in process 637.1 634.5
Finished goods 938.7 868.2
Other Inventory, Inventory at off Site Premises, Gross 21.0 23.0
Operating materials and supplies 125.3 121.4
Total Inventory $ 1,860.7 $ 1,739.2