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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2024
Fair Value Disclosures [Abstract]  
Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments
The carrying values and estimated fair values of certain of our financial instruments were as follows (in millions):
June 30, 2024December 31, 2023
Carrying Value  Estimated Fair Value  Carrying ValueEstimated Fair Value  
Second Lien Notes (1)
$1,081.0 $1,138.3 $1,079.3 $1,126.1 
Long-term notes receivable from ARO (2)(3)
$259.2 $368.8 $282.3 $423.5 

(1)The estimated fair value of the 8.375% Senior Secured Second Lien Notes due 2030 (the "Second Lien Notes") was determined using quoted market prices, which are level 1 inputs.
(2)The estimated fair value of our Notes Receivable from ARO was estimated using an income approach to value the forecasted cash flows attributed to the Notes Receivable from ARO using a discount rate based on a comparable yield with a country-specific risk premium, which are considered to be level 2 inputs.
(3)As a result of the Net Settlement Agreement with ARO executed in June 2024, the aggregate principal balance of the Notes Receivable from ARO was reduced to $352.0 million. See "Note 3 - Equity Method Investment in ARO" for additional information.