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LONG-TERM DEBT AND CREDIT FACILITIES - Corporate revolving credit and term loan facilities (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 16, 2019 | Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Long-term debt |  |  |  |
Proceeds from drawdown of debt |  |  | $ 300.0 | $ 80.0
Repayment of debt |  |  | 200.0 | 80.0
Letters of credit and surety bonds |  |  | 1,837.4 | 1,735.0
Tasiast Mauritanie Ltd. S.A. |  |  |  |
Long-term debt |  |  |  |
Maximum borrowing capacity | $ 300.0 |  |  |
Term of loan | 8 years |  |  |
Interest rate (as a percent) | 4.38% |  |  |
Standby fee (as percent of unused availablity) | 1.60% |  |  |
Revolving Credit Facility |  |  |  |
Long-term debt |  |  |  |
Facility utilized |  |  | 119.1 | $ 19.7
Maximum borrowing capacity |  |  | 1,500.0 |
Proceeds from drawdown of debt |  |  | $ 200.0 |
Borrowings, maturity |  |  | August 10, 2024 |
Repayment of debt |  | $ 100.0 | $ 300.0 |
Standby fee (as percent of unused availablity) |  |  | 0.325% |
Revolving Credit Facility | LIBOR |  |  |  |
Long-term debt |  |  |  |
Interest rate (as a percent) |  |  | 1.625% |
Letter of credit |  |  |  |
Long-term debt |  |  |  |
Repayment of debt |  |  | $ 19.1 |
Letter of credit | Minimum |  |  |  |
Long-term debt |  |  |  |
Interest rate (as a percent) |  |  | 1.0833% |
Letter of credit | Maximum |  |  |  |
Long-term debt |  |  |  |
Interest rate (as a percent) |  |  | 1.625% |

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