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IMPAIRMENT (CHARGE) REVERSAL - Narrative (Details)
 3 Months Ended 12 Months Ended
Dec. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Dec. 31, 2023
USD ($)
$ / oz
Dec. 31, 2021
USD ($)
Disclosure of impairment loss and reversal of impairment loss [line items]        
Net carrying amount $ 2,598,000,000   $ 3,496,500,000  
Price of gold, from 2022 to 2025 ($ per ounce) | $ / oz     1,700  
Price of gold, from 2026 onward ($ per ounce) | $ / oz     1,600  
Price per ounce of gold of un-modeled measured and indicated resources     $ 50  
Doyon CGU        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Impairment charge   $ 38,400,000    
Recoverable amount   96,000,000    
Plant and equipment        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Net carrying amount 419,300,000   384,700,000  
Gross carrying amount        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Net carrying amount 5,654,300,000   6,795,900,000 $ 6,470,100,000
Gross carrying amount | Plant and equipment        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Net carrying amount 1,498,200,000   $ 1,554,600,000 $ 1,977,900,000
Gross carrying amount | Plant and equipment | Doyon CGU        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Net carrying amount   $ 38,400,000    
Côté Gold Project        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Real weighted average costs of capital     0.055  
Doyon and Rosebel CGUs        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Real weighted average costs of capital     0.085  
Rosebel CGU        
Disclosure of impairment loss and reversal of impairment loss [line items]        
Sale of subsidiary, cash consideration 360,000,000      
Impairment charge 110,100,000      
Impairment post tax impartment charge $ 70,500,000