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LONG-TERM DEBT AND CREDIT FACILITIES - Other (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 05, 2017 | Dec. 04, 2017 | Dec. 31, 2016
Long-term debt |  |  |  |
Principal amount | $ 1,745.7 |  |  |
Letters of credit and surety bonds | 1,732.6 |  |  | $ 1,733.2
EDC |  |  |  |
Long-term debt |  |  |  |
Maximum borrowing |  | $ 300.0 | $ 250.0 |
Loan amount utilized | 215.2 |  |  | 215.1
Letters of credit and surety bonds | $ 230.2 |  |  | 117.7
EDC | Minimum |  |  |  |
Long-term debt |  |  |  |
Borrowing fees | 0.95% |  |  |
EDC | Maximum |  |  |  |
Long-term debt |  |  |  |
Borrowing fees | 1.00% |  |  |
Surety bonds |  |  |  |
Long-term debt |  |  |  |
Principal amount | $ 254.7 |  |  | $ 216.7

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