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Inventories (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Inventory, Net [Abstract]    
Raw materials $ 142.7 $ 64.9
Work-in-process 43.0 46.0
Finished goods 36.5 58.0
Operating and other supplies 243.7 229.9
Total inventories $ 465.9 $ 398.8