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Inventories (Tables)
6 Months Ended
Jun. 30, 2023
Inventory, Net [Abstract]  
Schedule of inventories
Inventories consist of the following:
June 30, 2023December 31, 2022
Raw materials$117.6 $64.9 
Work-in-process86.4 46.0 
Finished goods44.4 58.0 
Operating and other supplies262.4 229.9 
Total inventories$510.8 $398.8