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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
LONG-TERM NOTES RECEIVABLE FROM ARO $ 268.0 $ 254.0
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 $ 268.0 254.0
Reported Value Measurement [Member] | Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-Term Debt 681.9 542.4
Reported Value Measurement [Member] | Eight Point Two Five Percent Senior Lien Notes Due Two Thousand Twenty Eight Member | Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-Term Debt 0.0 542.4
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 681.9 0.0
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 353.4 336.7
Estimate of Fair Value Measurement [Member] | Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-Term Debt 701.3 545.9
Estimate of Fair Value Measurement [Member] | Eight Point Two Five Percent Senior Lien Notes Due Two Thousand Twenty Eight Member | Senior Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-Term Debt 0.0 545.9
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 $ 701.3 $ 0.0