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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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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amounts due from an entity in which the reporting entity shares joint control with another party or group, due after 1 year (or 1 business cycle).

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Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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