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IMPAIRMENT REVERSAL (CHARGE) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment charge $ 455.5 $ 0.0
Mining properties    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment charge (6.8) 0.0
Mining properties, Plant and equipment and ROU assets    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment charge 426.5 0.0
Asset retirement obligations    
Disclosure of impairment loss and reversal of impairment loss [line items]    
Impairment charge $ 35.8 $ 0.0