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Fair Value Measurements
9 Months Ended
Sep. 30, 2022
Fair Value Disclosures [Abstract]  
Fair Value Measurements Fair Value Measurements
The carrying values and estimated fair values of our long-term debt instrument were as follows (in millions):
September 30,
2022
December 31,
2021
Carrying Value  Estimated Fair Value  Carrying ValueEstimated Fair Value  
Senior secured first lien notes$541.8 $537.2 $545.3 $575.7 

The estimated fair value of the Senior Secured First Lien Notes due 2028 (the "First Lien Notes") was determined using quoted market prices, which are level 1 inputs.

As of September 30, 2022, the estimated fair value of our notes receivable from ARO was $268.1 million and was estimated by using an income approach to value the forecasted cash flows attributed to the notes receivable using a discount rate based on comparable yield with a country-specific risk premium.

The estimated fair values of our cash and cash equivalents, restricted cash, short-term investments, accounts receivable and trade payables approximated their carrying values as of September 30, 2022 and December 31, 2021.