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LONG-TERM DEBT AND CREDIT FACILITIES - Corporate revolving credit and term loan facilities (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 23, 2018 | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 06, 2017
Long-term debt |  |  |  |  |
Letters of credit and surety bonds |  |  | $ 1,735.0 | $ 1,732.6 |
Debt facility utilized throughout the year |  |  | 80.0 | 494.7 |
Debt securities |  |  |  |  | $ 500.0
Repayment of debt |  |  | $ 80.0 | 500.0 |
Standby fee applicable to unused availability |  |  | 0.34% |  |
Revolving credit facility |  |  |  |  |
Long-term debt |  |  |  |  |
Debt facility utilized throughout the year |  | $ 60.0 | $ 19.7 | $ 21.0 |
Maximum borrowing | $ 1,500.0 |  |  |  |
Extended maturity term | 1 year |  |  |  |
Repayment of debt |  |  | $ 80.0 |  |
Revolving credit facility | LIBOR Plus |  |  |  |  |
Long-term debt |  |  |  |  |
Interest Rates (as a percent) |  |  | 1.70% |  |
Letter of credit | Minimum |  |  |  |  |
Long-term debt |  |  |  |  |
Interest Rates (as a percent) |  |  | 1.13% |  |
Letter of credit | Maximum |  |  |  |  |
Long-term debt |  |  |  |  |
Interest Rates (as a percent) |  |  | 1.70% |  |

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- Definition Period extended of the term of a loan in which it must be paid, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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