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LONG-TERM DEBT AND CREDIT FACILITIES - Other (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Long-term debt |  |  |
Long-term debt and credit facilities |  | $ 2,232.6 | $ 2,556.9
Reclamation and remediation obligations |  |  |
Long-term debt |  |  |
Surety bonds outstanding |  | $ 375.1 | 317.0
Operations in Brazil, Mauritania, Ghana and Chile |  |  |
Long-term debt |  |  |
Fees incurred (as a percentage) |  | 0.75% |
Surety bonds outstanding |  | $ 241.8 | 267.5
EDC |  |  |
Long-term debt |  |  |
Maximum borrowing capacity |  | $ 300.0 |
Borrowings, maturity | June 30, 2024 |  |
Fees incurred (as a percentage) |  | 0.75% |
Long-term debt and credit facilities |  | $ 235.7 | 230.4
Surety bond |  |  |
Long-term debt |  |  |
Fees incurred (as a percentage) |  | 0.55% |
Surety bonds outstanding |  | $ 376.1 | 318.0
Surety bond | Reclamation and remediation obligations |  |  |
Long-term debt |  |  |
Surety bonds outstanding |  | $ 375.1 | $ 317.0

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