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LONG-TERM OBLIGATIONS (Tables) | 3 Months Ended
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Mar. 31, 2024
Debt Disclosure [Abstract] |
Schedule of Debt | Letters of credit outstanding (in millions):
|  |  |  |  | March 31, 2024 |  |  |  |  | December 31, 2023
$400 Million Facility |  |  |  |  | $ | — |  |  |  |  |  |  | $ | — |
$300 Million Facility |  |  |  |  | 71.0 |  |  |  |  |  |  | 71.8 |
Bilateral Arrangements |  |  |  |  | 46.8 |  |  |  |  |  |  | 48.1 |
Total |  |  |  |  | $ | 117.8 |  |  |  |  |  |  | $ | 119.9 |
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments | The Company estimates the fair value of its debt set forth below as of March 31, 2024, as follows (in millions, except for quotes):
| Book Value |  | Quote |  | Fair Value
5% Notes | $ | 600.0 |  |  | 0.94000 |  |  | $ | 564.0 |

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