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Inventories
3 Months Ended
Mar. 31, 2023
Inventory, Net [Abstract]  
Inventories InventoriesInventories consist of the following:
March 31, 2023December 31, 2022
Raw materials$98.8 $64.9 
Work-in-process47.8 46.0 
Finished goods43.4 58.0 
Operating and other supplies244.8 229.9 
Total inventories$434.8 $398.8 
Inventories are stated at the lower of cost or Net Realizable Value ("NRV") using the first-in, first-out or the weighted average cost method.