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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 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):
| September 30, 2023 |  | December 31, 2022
| Carrying Value |  | Estimated Fair Value |  | Carrying Value |  | Estimated Fair Value
Second Lien Notes (1) | $ | 1,079.4 |  |  | $ | 1,102.7 |  |  | $ | — |  |  | $ | — |
First Lien Notes (1) | $ | — |  |  | $ | — |  |  | $ | 542.4 |  |  | $ | 545.9 |
Long-term debt | $ | 1,079.4 |  |  | $ | 1,102.7 |  |  | $ | 542.4 |  |  | $ | 545.9 |
Long-term notes receivable from ARO (2) | $ | 275.2 |  |  | $ | 429.9 |  |  | $ | 254.0 |  |  | $ | 336.7 |
(1)The estimated fair value of the 8.375% Senior Secured Second Lien Notes due 2030 (the "Second Lien Notes") and Senior Secured First Lien Notes due 2028 (the "First Lien Notes"), which were redeemed in full on April 3, 2023, were 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 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: 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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