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LONG-TERM DEBT AND CREDIT FACILITIES (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Long-term debt |  |
Notional amount | $ 1,947.7 |
Deferred Financing Costs | (23.8) |
Carrying Amount | 1,923.9 | $ 1,837.4
Fair Value | 2,199.5 | 1,981.9
Senior notes |  |
Long-term debt |  |
Notional amount | 1,747.7 |
Deferred Financing Costs | (7.9) |
Carrying Amount | 1,739.8 | 1,737.4
Fair Value | $ 1,999.5 | $ 1,881.9
Senior notes | Minimum |  |
Long-term debt |  |
Interest rate (as a percent) | 4.50% | 4.50%
Senior notes | Maximum |  |
Long-term debt |  |
Interest rate (as a percent) | 6.875% | 6.875%
Revolving credit facility |  |
Long-term debt |  |
Carrying Amount |  | $ 100.0
Fair Value |  | $ 100.0
Interest rate (as a percent) | 1.625% | 1.625%
Long-term debt and credit facility |  |
Long-term debt |  |
Notional amount | $ 1,447.7 |
Deferred Financing Costs | (23.5) |
Carrying Amount | 1,424.2 | $ 1,837.4
Fair Value | 1,690.2 | $ 1,981.9
Less: current portion |  |
Long-term debt |  |
Notional amount | (500.0) |
Deferred Financing Costs | 0.3 |
Carrying Amount | (499.7) |
Fair Value | (509.3) |
Tasiat Mauritamie Ltd. S.A |  |
Long-term debt |  |
Notional amount | 200.0 |
Deferred Financing Costs | (15.9) |
Carrying Amount | 184.1 |
Fair Value | $ 200.0 |
Interest rate (as a percent) | 4.38% |

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