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Inventories (Tables)
6 Months Ended
Jun. 30, 2022
Inventory, Net [Abstract]  
Schedule of inventories
Inventories consist of the following:
June 30, 2022December 31, 2021
Raw materials$79.7 $132.9 
Work-in-process71.6 76.1 
Finished goods48.0 43.9 
Operating and other supplies216.6 172.7 
Total inventories$415.9 $425.6