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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2024
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, 2024 |  | December 31, 2023
| Carrying Value |  | Estimated Fair Value |  | Carrying Value |  | Estimated Fair Value
Second Lien Notes (1) | $ | 1,080.1 |  |  | $ | 1,134.0 |  |  | $ | 1,079.3 |  |  | $ | 1,126.1 |
Long-term notes receivable from ARO (2) | $ | 289.3 |  |  | $ | 424.0 |  |  | $ | 282.3 |  |  | $ | 423.5 |
(1)The estimated fair value of the 8.375% Senior Secured Second Lien Notes due 2030 (the "Second 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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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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