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Inventories (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Inventory, Net [Abstract]    
Raw materials $ 178.5 $ 180.8
Work-in-process 50.6 52.1
Finished goods 57.7 74.6
Operating and other supplies 226.6 231.5
Total inventories $ 513.4 $ 539.0