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LONG-TERM DEBT AND CREDIT FACILITY - Narrative (Details)
$ in Millions, $ in Millions
 12 Months Ended
Nov. 09, 2023
USD ($)
Sep. 23, 2020
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Feb. 01, 2026
USD ($)
Dec. 31, 2023
CAD ($)
Nov. 08, 2023
USD ($)
May 16, 2023
USD ($)
Dec. 31, 2022
CAD ($)
Disclosure of detailed information about borrowings [line items]                  
Letters of credit       $ 18.4         $ 24.8
Borrowings, Covenant, Minimum Liquidity Requirement     $ 150.0            
Borrowing costs capitalised     68.3 37.8          
Assets     $ 4,537.9 $ 4,425.1          
Original issue discount     7.38% 5.82%          
Borrowings     $ 830.8 $ 918.7          
Doyon and Côté Gold                  
Disclosure of detailed information about borrowings [line items]                  
Bonds outstanding to guarantee asset retirement obligations     152.5 159.5   $ 201.4     215.8
Côté Gold project                  
Disclosure of detailed information about borrowings [line items]                  
Bonds outstanding to guarantee asset retirement obligations     28.2 27.6   37.3     $ 37.3
Recurring fair value measurement                  
Disclosure of detailed information about borrowings [line items]                  
Assets     501.4 535.9          
Recurring fair value measurement | Embedded derivative                  
Disclosure of detailed information about borrowings [line items]                  
Assets     5.1            
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]                  
Assets     501.4 535.9          
Not measured at fair value in statement of financial position but for which fair value is disclosed | Embedded derivative                  
Disclosure of detailed information about borrowings [line items]                  
Assets     5.1 0.0          
Credit Facility                  
Disclosure of detailed information about borrowings [line items]                  
Borrowing facilities, maximum borrowing capacity $ 425.0   425.0   $ 372.0   $ 490.0    
Borrowing facilities, extension term 1 year                
Repayments of current borrowings     455.0 0.0          
Proceeds from non-current borrowings     0.0 455.0          
Letters of credit       38.0   $ 50.1      
Credit Facility | Long-term borrowings | Recurring fair value measurement                  
Disclosure of detailed information about borrowings [line items]                  
Long-term debt     387.0            
5.75% senior notes                  
Disclosure of detailed information about borrowings [line items]                  
Long-term debt     450.0 450.0          
Face amount   $ 450.0              
Borrowing costs capitalised   $ 7.5              
Borrowings     $ 448.0 $ 447.6          
5.75% senior notes | Prior to October 15, 2023                  
Disclosure of detailed information about borrowings [line items]                  
Redemption price percentage   100.00%              
5.75% senior notes | October 15, 2023                  
Disclosure of detailed information about borrowings [line items]                  
Redemption price percentage   104.313%              
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%     5.75%
5.75 Percent Senior Notes, Including Embedded Derivatives at Inception | Embedded Derivative Financial Instruments                  
Disclosure of detailed information about borrowings [line items]                  
Long-term debt   $ 454.2              
Term Loan                  
Disclosure of detailed information about borrowings [line items]                  
Long-term debt     $ 400.0 $ 0.0          
Face amount               $ 400.0  
Term of borrowings     5 years            
Borrowing costs incurred     $ 11.0            
Original issue discount     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 Financial Instruments                  
Disclosure of detailed information about borrowings [line items]                  
Financial assets, at fair value     $ 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     $ 7.3 16.2          
Borrowings     $ 7.2 16.1          
Equipment loans | Bottom of range                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate     5.23%     5.23%      
Equipment loans | Top of range                  
Disclosure of detailed information about borrowings [line items]                  
Interest rate     5.95%     5.95%      
Uncollateralized Surety Bonds                  
Disclosure of detailed information about borrowings [line items]                  
Long-term debt     $ 118.9            
Uncollateralized Surety Bonds | Doyon and Côté Gold                  
Disclosure of detailed information about borrowings [line items]                  
Bonds outstanding to guarantee asset retirement obligations     22.6 18.4   $ 29.8     $ 24.9
Cash Collateral | Doyon and Côté Gold                  
Disclosure of detailed information about borrowings [line items]                  
Bonds outstanding to guarantee asset retirement obligations     $ 11.0 $ 10.9