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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2025
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):
| June 30, 2025 |  | December 31, 2024
| Carrying Value |  | Estimated Fair Value |  | Carrying Value |  | Estimated Fair Value
2030 Second Lien Notes (1) | $ | 1,084.3 |  |  | $ | 1,130.1 |  |  | $ | 1,082.7 |  |  | $ | 1,112.7 |
Notes Receivable from ARO (2) | $ | 308.5 |  |  | $ | 379.4 |  |  | $ | 296.2 |  |  | $ | 378.3 |
(1)The estimated fair value of the 2030 Second Lien Notes (as defined in "Note 8 - Debt") was determined using quoted market prices, which are level 1 inputs. (2)The estimated fair value of the 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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