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LONG-TERM DEBT AND CREDIT FACILITIES - Other (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Long-term debt |  |
Long-term debt and credit facilities | $ 1,837.4 | $ 1,735.0
Operations in Brazil, Mauritania, Ghana and Chile |  |
Long-term debt |  |
Surety bonds | $ 184.7 | 161.5
Fees incured (as a percentage) | 0.70% |
Letter of Credit guarantee facility |  |
Long-term debt |  |
Maximum borrowing capacity | $ 300.0 |
Borrowings, maturity | June 30, 2020 |
Long-term debt and credit facilities | $ 227.8 | 227.4
Fees incured (as a percentage) | 0.95% |
Surety bonds |  |
Long-term debt |  |
Surety bonds | $ 276.5 | $ 264.4
Fees incured (as a percentage) | 0.65% |

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