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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 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):
December 31, 2024December 31, 2023
Carrying
Value		Estimated
  Fair
Value		Carrying
Value 		Estimated
  Fair
Value
Second Lien Notes (1)
$1,082.7 $1,112.7 $1,079.3 $1,126.1 
Notes Receivable from ARO (2)(3)
$296.2 $378.3 $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 the 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)The aggregate principal balance of the Notes Receivable from ARO includes a net reduction of $26.1 million, which is comprised of a $50.7 million decrease resulting from the Net Settlement Agreement with ARO (executed in June 2024) and an increase of $24.6 million related to paid in kind interest, which was applied to the principal balance on December 31, 2024. See "Note 3 - Equity Method Investment in ARO" for additional information.