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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Inventory Disclosure [Abstract]    
Raw materials $ 193.0 $ 92.1
Work in process 698.8 634.5
Finished goods 1,136.7 868.2
Other Inventory, Inventory at off Site Premises, Gross 23.9 23.0
Operating materials and supplies 142.0 121.4
Total Inventory $ 2,194.4 $ 1,739.2