Stock-Based Compensation (Summary Of Nonvested Shares) (Details)	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Performance Share Units | Market Condition PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares issued per share unit, minimum	0.00%
Percentage of shares issued per share unit, maximum	200.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at January 1, 2023(c) | shares	744,273
Granted | shares	311,674
Forfeitures | shares	(45,080)
Dividend equivalents | shares	14,749
Vested and distributed | shares	(263,904)
Outstanding at December 31, 2023(c) | shares	761,712
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted-average Fair Value per Unit, Nonvested at beginning of year (in dollars per share) | $ / shares	$ 87.23
Fair value of share units awarded | $ / shares	88.52
Weighted-average Fair Value per Unit, Unearned or forfeited (in dollars per share) | $ / shares	90.97
Weighted-average Fair Value per Unit, Dividend Equivalent (in dollars per share) | $ / shares	89.79
Weighted-average Fair Value per Unit, Vested and distributed (in dollars per share) | $ / shares	82.50
Weighted-average Fair Value per Unit, Nonvested at end of year (in dollars per share) | $ / shares	$ 89.22
Performance Share Units | Performance Condition PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares issued per share unit, minimum	0.00%
Percentage of shares issued per share unit, maximum	200.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at January 1, 2023(c) | shares	119,737
Granted | shares	40,118
Forfeitures | shares	(7,389)
Dividend equivalents | shares	2,372
Vested and distributed | shares	(42,447)
Outstanding at December 31, 2023(c) | shares	112,391
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted-average Fair Value per Unit, Nonvested at beginning of year (in dollars per share) | $ / shares	$ 80.65
Fair value of share units awarded | $ / shares	84.70
Weighted-average Fair Value per Unit, Unearned or forfeited (in dollars per share) | $ / shares	84.73
Weighted-average Fair Value per Unit, Dividend Equivalent (in dollars per share) | $ / shares	82.66
Weighted-average Fair Value per Unit, Vested and distributed (in dollars per share) | $ / shares	76.70
Weighted-average Fair Value per Unit, Nonvested at end of year (in dollars per share) | $ / shares	$ 83.36
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Outstanding at January 1, 2023(c) | shares	436,812
Granted | shares	130,600
Forfeitures | shares	(22,566)
Dividend equivalents | shares	9,132
Vested and distributed | shares	(176,114)
Outstanding at December 31, 2023(c) | shares	377,864
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Weighted-average Fair Value per Unit, Nonvested at beginning of year (in dollars per share) | $ / shares	$ 80.94
Fair value of share units awarded | $ / shares	84.44
Weighted-average Fair Value per Unit, Unearned or forfeited (in dollars per share) | $ / shares	84.75
Weighted-average Fair Value per Unit, Dividend Equivalent (in dollars per share) | $ / shares	82.44
Weighted-average Fair Value per Unit, Vested and distributed (in dollars per share) | $ / shares	76.94
Weighted-average Fair Value per Unit, Nonvested at end of year (in dollars per share) | $ / shares	$ 83.82