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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 |  |  |  |  |

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