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PROVISIONS - Future Disbursements (Details) - Dec. 31, 2024
$ in Millions, $ in Millions
CAD ($)
USD ($)
Disclosure of other provisions [line items]    
Undiscounted amounts required $ 393.4 $ 100.5
Westwood Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 393.4  
Essakane Mine    
Disclosure of other provisions [line items]    
Undiscounted amounts required   100.5
2025 | Westwood Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 22.7  
2025 | Essakane Mine    
Disclosure of other provisions [line items]    
Undiscounted amounts required   1.4
2026 | Westwood Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 24.0  
2026 | Essakane Mine    
Disclosure of other provisions [line items]    
Undiscounted amounts required   2.6
2027 | Westwood Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 12.3  
2027 | Essakane Mine    
Disclosure of other provisions [line items]    
Undiscounted amounts required   2.8
2028 | Westwood Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 5.9  
2028 | Essakane Mine    
Disclosure of other provisions [line items]    
Undiscounted amounts required   4.2
2029 | Westwood Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required 2.6  
2029 | Essakane Mine    
Disclosure of other provisions [line items]    
Undiscounted amounts required   6.9
2030 onwards | Westwood Mine and Other Canadian Sites    
Disclosure of other provisions [line items]    
Undiscounted amounts required $ 325.9  
2030 onwards | Essakane Mine    
Disclosure of other provisions [line items]    
Undiscounted amounts required   $ 82.6