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LONG-TERM DEBT AND CREDIT FACILITIES - Other (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Long-term debt |  |
Principal amount | $ 1,746.3 |
Letters of credit and surety bonds | 1,735.0 | $ 1,732.6
EDC |  |
Long-term debt |  |
Maximum borrowing | 300.0 |
Loan amount utilized | 227.4 | 215.2
Letters of credit and surety bonds | $ 161.5 | 230.2
EDC | Minimum |  |
Long-term debt |  |
Borrowing fees | 0.95% |
Surety bonds |  |
Long-term debt |  |
Principal amount | $ 264.4 | $ 254.7
Fees incured (as a percentage) | 0.70% |

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