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Fair Value Measurements (Schedule Of Carrying Values And Estimated Fair Values Of Debt Instruments) (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
LONG-TERM NOTES RECEIVABLE FROM ARO $ 261.0 $ 254.0
Reported Value Measurement [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
LONG-TERM NOTES RECEIVABLE FROM ARO 261.0 254.0
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 542.8 542.4
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 321.9 336.7
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 $ 561.8 $ 545.9