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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Apr. 30, 2021
--- | --- | --- | ---
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Long-term Debt |  |  | $ 544.8
LONG-TERM NOTES RECEIVABLE FROM ARO | $ 282.3 | $ 254.0 | $ 228.3
Senior Secured Second Lien Notes | Senior Notes [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Debt instrument interest rate stated percentage | 8.375% |  |
Reported Value Measurement [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
LONG-TERM NOTES RECEIVABLE FROM ARO | $ 282.3 | 254.0 |
Reported Value Measurement [Member] | Senior Notes [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Long-term Debt | 1,079.3 | 542.4 |
Reported Value Measurement [Member] | Senior Secured Second Lien Notes | Senior Notes [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Long-term Debt | 1,079.3 | 0.0 |
Reported Value Measurement [Member] | Senior Secured First Lien Notes | Senior Notes [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Long-term Debt | 0.0 | 542.4 |
Estimate of Fair Value Measurement [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
LONG-TERM NOTES RECEIVABLE FROM ARO | 423.5 | 336.7 |
Estimate of Fair Value Measurement [Member] | Senior Notes [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Long-term Debt | 1,126.1 | 545.9 |
Estimate of Fair Value Measurement [Member] | Senior Secured Second Lien Notes | Senior Notes [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Long-term Debt | 1,126.1 | 0.0 |
Estimate of Fair Value Measurement [Member] | Senior Secured First Lien Notes | Senior Notes [Member] |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |
Long-term Debt | $ 0.0 | $ 545.9 |

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