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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
LONG-TERM NOTES RECEIVABLE FROM ARO | $ 314.7 | $ 296.2
ARO |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
LONG-TERM NOTES RECEIVABLE FROM ARO | 314.7 | 296.2
Principal amount | 376.6 | 376.6
Reported Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
LONG-TERM NOTES RECEIVABLE FROM ARO | 314.7 | 296.2
Reported Value Measurement [Member] | Eight Point Three Seven Five Percent Senior Second Lien Notes | Senior Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-Term Debt | 1,085.2 | 1,082.7
Estimate of Fair Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
LONG-TERM NOTES RECEIVABLE FROM ARO | 379.6 | 378.3
Estimate of Fair Value Measurement [Member] | Eight Point Three Seven Five Percent Senior Second Lien Notes | Senior Notes |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Long-Term Debt | $ 1,142.4 | $ 1,112.7

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