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Fair Value Measurements
6 Months Ended
Jun. 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):
June 30,
2022
December 31,
2021
Carrying Value  Estimated Fair Value  Carrying Value  Estimated Fair Value  
Senior secured first lien notes due 2028$545.7 $534.6 $545.3 $575.7 

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

As of June 30, 2022, the estimated fair value of our notes receivable from ARO was $293.1 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, accounts receivable and trade payables approximated their carrying values as of June 30, 2022 and December 31, 2021.