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LONG-TERM DEBT AND CREDIT FACILITIES (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Long-term debt |  |
Long-term debt | $ 1,735.0 | $ 1,732.6
Notional amount | 1,746.3 |
Deferred Financing Costs | (11.3) |
Carrying Amount | 1,735.0 | 1,732.6
Fair Value |  |
Long-term debt |  |
Long-term debt | 1,668.8 | 1,848.4
Senior notes |  |
Long-term debt |  |
Notional amount | 1,746.3 |
Deferred Financing Costs | (11.3) |
Carrying Amount | 1,735.0 | 1,732.6
Senior notes | Fair Value |  |
Long-term debt |  |
Fair Value | $ 1,668.8 | $ 1,848.4
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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