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Inventories (Tables)
3 Months Ended
Mar. 31, 2022
Inventory, Net [Abstract]  
Schedule of inventories
Inventories consist of the following:
March 31, 2022December 31, 2021
Raw materials$127.1 $132.9 
Work-in-process69.6 76.1 
Finished goods43.9 43.9 
Operating and other supplies185.9 172.7 
Total inventories$426.5 $425.6