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Fair Value Measurements
12 Months Ended
Dec. 31, 2022
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, 2022December 31, 2021
Carrying
Value
Estimated
  Fair
Value
Carrying
Value
Estimated
  Fair
Value
First Lien Notes(1)
$542.4 $545.9 $545.3 $575.7 
Long-term notes receivable from ARO (2)
$254.0 $336.7 $249.1 $266.7 

(1)The estimated fair value of the First 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.
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, 2022 and 2021 (Successor).