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IMPAIRMENT (REVERSAL) CHARGE - Inventories (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Impairment charges      
Impairment (reversal) charge   $ (74.1) $ 38.9
Inventories     38.9
Fort Knox      
Impairment charges      
Inventories     38.9
Impairment impact on tax recovery     $ 3.1
Round Mountain      
Impairment charges      
Impairment (reversal) charge $ (74.1)