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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2023
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):
| March 31, 2023 |  | December 31, 2022
| Carrying Value |  | Estimated Fair Value |  | Carrying Value |  | Estimated Fair Value
First Lien Notes (1) | $ | 542.8 |  |  | $ | 561.8 |  |  | $ | 542.4 |  |  | $ | 545.9 |
Long-term notes receivable from ARO (2) | $ | 261.0 |  |  | $ | 321.9 |  |  | $ | 254.0 |  |  | $ | 336.7 |
(1)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. (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.

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