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Inventories (Tables)
6 Months Ended
Jun. 30, 2024
Inventory, Net [Abstract]  
Schedule of inventories
Inventories consist of the following:
June 30, 2024December 31, 2023
Raw materials$113.0 $162.5 
Work-in-process49.0 42.9 
Finished goods53.2 46.3 
Operating and other supplies252.3 225.3 
Total inventories$467.5 $477.0