Retirement Plans (Schedule Of Defined Benefit Pension Assets Investment) (Details)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Equity investments, target allocation	100.00%
Target return	5.30%
Equity investments, actual allocation	100.00%	100.00%
Equity Investments
Defined Benefit Plan Disclosure [Line Items]
Equity investments, target allocation	22.50%
Fixed income, target return minimum	5.80%
Fixed income, target return maximum	7.50%
Equity investments, actual allocation	14.70%	41.10%
Fixed Income
Defined Benefit Plan Disclosure [Line Items]
Equity investments, target allocation	64.70%
Fixed income, target return minimum	4.20%
Fixed income, target return maximum	7.00%
Equity investments, actual allocation	68.20%	44.70%
Other
Defined Benefit Plan Disclosure [Line Items]
Equity investments, target allocation	12.80%
Fixed income, target return minimum	0.50%
Fixed income, target return maximum	7.30%
Equity investments, actual allocation	17.10%	14.20%