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Share-Based Compensation (Summary Of Performance Share Units Grant-Date Fair Values And Their Related Assumptions) (Details)
6 Months Ended
Jun. 30, 2022
$ / shares
Performance Share Units [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Grant-date fair value $ 44.05
Risk-free interest rate 1.81%
Volatility factor 70.10%
Contractual term (years) 2 years 10 months 20 days
Including Performance Factor Shares Granted [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Grant-date fair value $ 68.68