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LONG-TERM DEBT AND CREDIT FACILITIES - Revolving credit and term loan facilities (Details) - USD ($) $ in Millions |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 18, 2020 | Jul. 24, 2020 | Mar. 20, 2020 | Dec. 16, 2019 | Jul. 25, 2019 | Feb. 29, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Long-term debt |  |  |  |  |  |  |  |
Repayment of debt |  |  |  |  |  |  | $ 850.0 | $ 200.0
Proceeds from drawdown of debt |  |  |  |  |  |  | 950.0 | 300.0
Letters of credit and surety bonds |  |  |  |  |  |  | 1,923.9 | 1,837.4
Tasiat Mauritamie Ltd. S.A |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 300.0 |  |  |  |
Proceeds from drawdown of debt |  |  |  | 200.0 |  |  |  |
Remaining borrowing capacity |  |  |  | $ 100.0 |  |  |  |
Amount held in separate bank account for repayments |  |  |  |  |  |  | $ 25.0 |
Interest rate (as a percent) |  |  |  |  |  |  | 4.38% |
Standby fee (as percent of unused availablity) |  |  |  |  |  |  | 1.60% |
Revolving Credit Facility |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |
Facility utilized |  |  |  |  |  |  | $ 7.5 | $ 119.1
Maximum borrowing capacity |  |  |  |  | $ 1,500.0 |  | $ 1,500.0 |
Repayment of debt | $ 500.0 | $ 250.0 |  |  |  | $ 100.0 |  |
Proceeds from drawdown of debt |  |  | $ 750.0 |  |  |  |  |
Borrowings, maturity |  |  |  |  | August 10, 2024 |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 1.625% |
Standby fee (as percent of unused availablity) |  |  |  |  |  |  | 0.325% |
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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