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Inventories (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Inventory, Net [Abstract]    
Raw materials $ 98.8 $ 64.9
Work-in-process 47.8 46.0
Finished goods 43.4 58.0
Operating and other supplies 244.8 229.9
Total inventories $ 434.8 $ 398.8