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Benefit Plans (Summary Of Equity-based Compensation Plans Grants) (Details)
 9 Months Ended
Sep. 30, 2025
$ / shares
shares
Performance Shares (total shareowner return metric) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grants (in shares/units) | shares 105,896
Weighted average grant date fair value (in dollars per share/unit) | $ / shares $ 66.52
Performance Shares (net income and environmental metrics) [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grants (in shares/units) | shares 118,883
Weighted average grant date fair value (in dollars per share/unit) | $ / shares $ 61.63
Restricted Stock Units [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grants (in shares/units) | shares 100,245
Weighted average grant date fair value (in dollars per share/unit) | $ / shares $ 61.66