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LONG-TERM OBLIGATIONS (Tables) | 9 Months Ended
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Sep. 30, 2023
Debt Disclosure [Abstract] |
Schedule of Debt | Letters of credit outstanding (in millions):
|  |  |  |  | September 30, 2023 |  |  |  |  | December 31, 2022
$400 Million Facility |  |  |  |  | $ | — |  |  |  |  |  |  | $ | — |
$300 Million Facility |  |  |  |  | 69.6 |  |  |  |  |  |  | 70.4 |
Bilateral Arrangements |  |  |  |  | 49.1 |  |  |  |  |  |  | 48.0 |
Total |  |  |  |  | $ | 118.7 |  |  |  |  |  |  | $ | 118.4 |
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 September 30, 2023, as follows (in millions, except for quotes):
| Book Value |  | Quote |  | Fair Value
5% Notes | $ | 600.0 |  |  | 0.89500 |  |  | $ | 537.0 |

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