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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
LONG-TERM NOTES RECEIVABLE FROM ARO $ 259.2 $ 282.3
ARO    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
LONG-TERM NOTES RECEIVABLE FROM ARO 259.2 282.3
Principal amount $ 352.0 402.7
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 $ 259.2 282.3
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 1,081.0 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 368.8 423.5
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 $ 1,138.3 $ 1,126.1