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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Apr. 30, 2021
--- | --- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Long-term Debt |  |  | $ 544.8
Principal amount | $ 254.0 | $ 249.1 | $ 228.3
ARO |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Principal amount | 402.7 | 442.7 |
Debt instrument, Fair Value Disclosure | 336.7 | 266.7 |
Reported Value Measurement [Member] | Secured first lien notes due 2028 | Senior Notes [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Long-term Debt | 542.4 | 545.3 |
Estimate of Fair Value Measurement [Member] | Secured first lien notes due 2028 | Senior Notes [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt instrument, Fair Value Disclosure | $ 545.9 | $ 575.7 |

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