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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Inventory, Net [Abstract]    
Raw materials $ 172.0 $ 162.5
Work-in-process 44.7 42.9
Finished goods 48.2 46.3
Operating and other supplies 219.3 225.3
Total inventories $ 484.2 $ 477.0