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Inventories (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Inventory, Net [Abstract]    
Raw materials $ 64.9 $ 132.9
Work-in-process 46.0 76.1
Finished goods 58.0 43.9
Operating and other supplies 229.9 172.7
Inventories $ 398.8 $ 425.6