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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Inventory Disclosure [Abstract]    
Raw materials $ 214.8 $ 148.6
Work in process 1,107.2 941.1
Finished goods 1,681.6 1,239.8
Other Inventory, Inventory at off Site Premises, Gross [1] 50.1 53.5
Operating materials and supplies 225.4 165.4
Total Inventory $ 3,279.1 $ 2,548.4
[1] Final price deferred is product that has shipped to customers, but the price has not yet been agreed upon.