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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
LONG-TERM NOTES RECEIVABLE FROM ARO | $ 289.3 | $ 282.3
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] |  |
Debt Instrument, Interest Rate, Stated Percentage | 8.375% |
Reported Value Measurement [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
LONG-TERM NOTES RECEIVABLE FROM ARO | $ 289.3 | 282.3
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 | 1,080.1 | 1,079.3
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 | 424.0 | 423.5
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 | $ 1,134.0 | $ 1,126.1

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