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LONG-TERM DEBT AND CREDIT FACILITY - Narrative (Details)
$ in Millions, $ in Millions
 12 Months Ended
Sep. 23, 2020
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2024
CAD ($)
Dec. 20, 2024
USD ($)
Dec. 19, 2024
USD ($)
Dec. 31, 2023
CAD ($)
May 16, 2023
USD ($)
Dec. 31, 2022
USD ($)
Disclosure of detailed information about borrowings [line items]                  
Available amount under Credit facility   $ 418.5 $ 387.0           $ 26.6
Borrowings, covenant, minimum liquidity requirement   150.0              
Unamortized deferred transaction costs   77.8 68.3            
Total carrying amount of the financial assets   $ 5,374.4 $ 4,537.9            
Weighted average interest rate of capitalized borrowing costs   8.90% 7.38%            
Carrying amount, net of unamortized deferred transaction costs and embedded derivatives   $ 1,028.9 $ 830.8            
Doyon and Côté Gold                  
Disclosure of detailed information about borrowings [line items]                  
Bonds outstanding to guarantee the construction of Cote Gold mine   177.5 152.5 $ 255.7     $ 201.4    
Côté Gold mine                  
Disclosure of detailed information about borrowings [line items]                  
Bonds outstanding to guarantee the construction of Cote Gold mine   22.2 28.2 $ 32.0     37.3    
Not measured at fair value in statement of financial position but for which fair value is disclosed                  
Disclosure of detailed information about borrowings [line items]                  
Total carrying amount of the financial assets   472.0 501.4            
Embedded derivative | Not measured at fair value in statement of financial position but for which fair value is disclosed                  
Disclosure of detailed information about borrowings [line items]                  
Total carrying amount of the financial assets   0.0 0.0            
Credit Facility                  
Disclosure of detailed information about borrowings [line items]                  
Available amount under Credit facility         $ 650.0 $ 425.0      
5.75% senior notes                  
Disclosure of detailed information about borrowings [line items]                  
Face amount $ 450.0                
Unamortized deferred transaction costs $ 7.5                
Long-term debt   450.0 450.0            
Carrying amount, net of unamortized deferred transaction costs and embedded derivatives   $ 448.4 448.0            
5.75% senior notes | Embedded derivative | Not measured at fair value in statement of financial position but for which fair value is disclosed                  
Disclosure of detailed information about borrowings [line items]                  
Total carrying amount of the financial assets     0.0            
5.75% senior notes | October 15, 2024                  
Disclosure of detailed information about borrowings [line items]                  
Redemption price percentage 102.875%                
5.75% senior notes | October 15, 2025                  
Disclosure of detailed information about borrowings [line items]                  
Redemption price percentage 101.438%                
5.75% senior notes | October 15, 2026 and thereafter                  
Disclosure of detailed information about borrowings [line items]                  
Redemption price percentage 100.00%                
5.75% senior notes | Fixed interest rate                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate 5.75% 5.75%   5.75%          
5.75 Percent Senior Notes, Including Embedded Derivatives at Inception | Embedded derivative                  
Disclosure of detailed information about borrowings [line items]                  
Long-term debt $ 454.2                
Term Loan                  
Disclosure of detailed information about borrowings [line items]                  
Face amount               $ 400.0  
Long-term debt   $ 400.0 400.0            
Term of borrowings   5 years              
Borrowing costs incurred   $ 11.0              
Weighted average interest rate of capitalized borrowing costs   3.00%              
Make-whole premium, discounted value if paid within two years   104.00%              
Make-whole premium, discounted value if paid after two years   104.00%              
Make-whole premium, discounted value if paid after three years   101.00%              
Make-whole premium, discounted value if paid thereafter   100.00%              
Term Loan | Embedded derivative | Not measured at fair value in statement of financial position but for which fair value is disclosed                  
Disclosure of detailed information about borrowings [line items]                  
Total carrying amount of the financial assets   $ 26.7 5.1            
Term Loan | Embedded derivative                  
Disclosure of detailed information about borrowings [line items]                  
Financial assets, at fair value   $ 26.7 5.1         $ 1.0  
Term Loan | Fixed interest rate                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate   8.25%   8.25%          
Equipment loans                  
Disclosure of detailed information about borrowings [line items]                  
Long-term debt   $ 2.1              
Carrying amount, net of unamortized deferred transaction costs and embedded derivatives   $ 2.1 7.2            
Equipment loans | Top of range                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate   5.30%   5.30%          
Uncollateralized Surety Bonds                  
Disclosure of detailed information about borrowings [line items]                  
Long-term debt   $ 159.2              
Uncollateralized Surety Bonds | Westwood and Côté Gold                  
Disclosure of detailed information about borrowings [line items]                  
Bonds outstanding to guarantee the construction of Cote Gold mine   7.4 22.6 $ 10.6     $ 29.8    
Cash Collateral | Westwood and Côté Gold                  
Disclosure of detailed information about borrowings [line items]                  
Bonds outstanding to guarantee the construction of Cote Gold mine   $ 10.9 $ 10.9