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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Inventory Disclosure [Abstract]    
Raw materials $ 62.0 $ 68.3
Work in process 601.2 618.4
Finished goods 1,120.8 1,219.3
Other Inventory, Inventory at off Site Premises, Gross [1] 44.4 47.9
Operating materials and supplies 102.5 122.5
Total Inventory $ 1,930.9 $ 2,076.4
[1] Final price deferred is product that has shipped to customers, but the price has not yet been agreed upon.