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LONG-TERM OBLIGATIONS (Tables)
12 Months Ended
Dec. 31, 2023
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Long-term debt is summarized as follows (in millions):
 December 31,
20232022
5% Senior Notes due May 15, 2029, net of unamortized debt issuance costs of $5.0 and $6.0 million at December 31, 2023 and 2022, respectively
$595.0 $594.0 
Credit Agreement - revolving line of credit expires on April 1, 2026— 177.0 
Secured borrowings
19.0 — 
Finance lease obligations8.7 4.2 
Other0.5 0.3 
Total debt623.2 775.5 
Less: Current portion of long-term debt(2.8)(1.9)
Long-term debt, less current portion$620.4 $773.6 
Schedule of Debt
Letters of credit outstanding (in millions):
December 31, 2023December 31, 2022
$400 Million Facility$— $— 
$300 Million Facility71.8 70.4 
Bilateral Arrangements48.1 48.0 
Total$119.9 $118.4 
Schedule of Maturities of Long-term Debt Amounts shown are exclusive of minimum lease payments for capital lease obligations and secured borrowings (in millions):
2024$0.2 
20250.1 
20260.1 
20270.1 
2028— 
Thereafter600.0 
Total Debt600.5 
Less: Unamortized debt issuance costs(5.0)
Net debt$595.5 
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 December 31, 2023 and 2022, as follows (in millions, except for quotes):
2023Book ValueQuoteFair Value
5% Notes$600.0 0.94375 $566.3 
2022Book ValueQuoteFair Value
5% Notes$600.0 0.89250 $535.5