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LONG-TERM DEBT AND CREDIT FACILITIES - Other (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Long-term debt |  |
Long-term debt and credit facilities | $ 1,424.2 | $ 1,837.4
Operations in Brazil, Mauritania, Ghana and Chile |  |
Long-term debt |  |
Surety bonds | $ 175.6 | 184.7
Fees incured (as a percentage) | 0.74% |
Letter of Credit guarantee facility |  |
Long-term debt |  |
Maximum borrowing capacity | $ 300.0 |
Borrowings, maturity | June 30, 2022 |
Long-term debt and credit facilities | $ 228.9 | 227.8
Fees incured (as a percentage) | 0.75% |
Surety bonds |  |
Long-term debt |  |
Surety bonds | $ 290.1 | $ 276.5
Fees incured (as a percentage) | 0.50% |

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