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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Inventory Disclosure [Abstract]    
Raw materials $ 97.0 $ 135.8
Work in process 964.3 964.8
Finished goods 1,276.7 1,178.0
Other Inventory, Inventory at off Site Premises, Gross [1] 90.7 61.5
Operating materials and supplies 174.3 183.1
Total Inventory $ 2,603.0 $ 2,523.2
[1] Final price deferred is product that has shipped to customers, but the price has not yet been agreed upon.