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LONG-TERM DEBT AND CREDIT FACILITIES (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Long-term debt |  |
Long-term debt | $ 1,732.6 | $ 1,733.2
Notional amount | 1,745.7 |
Deferred Financing Costs | (13.1) |
Carrying Amount | 1,732.6 | 1,733.2
Fair Value |  |
Long-term debt |  |
Long-term debt | 1,848.4 | 1,743.1
Corporate term loan facility |  |
Long-term debt |  |
Carrying Amount |  | 497.4
Corporate term loan facility | Fair Value |  |
Long-term debt |  |
Fair Value |  | 497.4
Senior notes |  |
Long-term debt |  |
Notional amount | 1,745.7 |
Deferred Financing Costs | (13.1) |
Carrying Amount | 1,732.6 | 1,235.8
Senior notes | Fair Value |  |
Long-term debt |  |
Fair Value | $ 1,848.4 | $ 1,245.7
Senior notes | Minimum |  |
Long-term debt |  |
Interest Rates (as a percent) | 4.50% | 4.50%
Senior notes | Maximum |  |
Long-term debt |  |
Interest Rates (as a percent) | 6.875% | 6.875%

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