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Inventories
6 Months Ended
Jun. 30, 2025
Inventory, Net [Abstract]  
Inventories
8.    Inventories
Inventories consist of the following:
June 30, 2025December 31, 2024
Raw materials$178.5 $180.8 
Work-in-process50.6 52.1 
Finished goods57.7 74.6 
Operating and other supplies226.6 231.5 
Total inventories$513.4 $539.0 
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.