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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 83.0 $ 68.3
Work in process 594.9 618.4
Finished goods 829.5 1,219.3
Other Inventory, Inventory at off Site Premises, Gross 56.1 47.9
Operating materials and supplies 117.8 122.5
Total Inventory $ 1,681.3 $ 2,076.4