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Fair Value Measurements
 12 Months Ended
Dec. 31, 2025
Fair Value Disclosures [Abstract]  
Fair Value Measurements FAIR VALUE MEASUREMENTS
The carrying values and estimated fair values of certain of our financial instruments were as follows (in millions):
December 31, 2025December 31, 2024
Carrying
Value		Estimated
  Fair
Value		Carrying
Value 		Estimated
  Fair
Value
2030 Second Lien Notes (1)
$1,086.0 $1,144.9 $1,082.7 $1,112.7 
Notes Receivable from ARO (2)(3)
$345.0 $403.8 $296.2 $378.3 

(1)The estimated fair value of the 2030 Second Lien Notes (as defined in "Note 6 - Debt") 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 as of December 31, 2025, includes an increase of $24.1 million related to paid in kind interest, which was applied to the principal balance on December 31, 2025. See "Note 3 - Equity Method Investment in ARO" for additional information.
The estimated fair values of our cash and cash equivalents, restricted cash, accounts receivable and trade payables approximated their carrying values as of December 31, 2025 and 2024.