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LONG-TERM OBLIGATIONS LONG TERM OBLIGATIONS (Tables)
6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Schedule of Debt
Letters of credit outstanding (in millions):
June 30, 2021December 31, 2020
$400 Million Facility$— $— 
$300 Million Facility60.1 35.3 
Bilateral Arrangements53.8 47.2 
Total$113.9 $82.5 
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
Based on indicative price quotations from financial institutions multiplied by the amount recorded on the Company’s Condensed Consolidated Balance Sheet (“Book Value”), the Company estimates the fair values of its debt set forth below as of June 30, 2021, as follows (in millions, except for quotes):
 Book ValueQuoteFair Value
5% Notes$600.0 1.04250 $625.5 
Original Term Loan (net of discount)$299.4 $0.99791 $298.8