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LONG-TERM OBLIGATIONS (Tables)
6 Months Ended
Jun. 30, 2023
Debt Disclosure [Abstract]  
Schedule of Debt
Letters of credit outstanding (in millions):
June 30, 2023December 31, 2022
$400 Million Facility$— $— 
$300 Million Facility71.1 70.4 
Bilateral Arrangements48.7 48.0 
Total$119.8 $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 June 30, 2023, as follows (in millions, except for quotes):
 Book ValueQuoteFair Value
5% Notes$600.0 0.93000 $558.0