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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Inventory, Net [Abstract]    
Raw materials $ 162.5 $ 64.9
Work-in-process 42.9 46.0
Finished goods 46.3 58.0
Operating and other supplies 225.3 229.9
Inventories $ 477.0 $ 398.8