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Inventories (Tables)
9 Months Ended
Sep. 30, 2023
Inventory, Net [Abstract]  
Schedule of inventories
Inventories consist of the following:
September 30, 2023December 31, 2022
Raw materials$142.7 $64.9 
Work-in-process43.0 46.0 
Finished goods36.5 58.0 
Operating and other supplies243.7 229.9 
Total inventories$465.9 $398.8