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Inventories (Tables)
6 Months Ended
Jun. 30, 2021
Inventory, Net [Abstract]  
Schedule of inventories
Inventories consist of the following:
June 30, 2021
December 31, 2020
Raw materials$113.3 $95.9 
Work-in-process51.2 40.5 
Finished goods24.5 26.9 
Operating and other supplies142.5 127.8 
Total inventories$331.5 $291.1