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Stock-Based Compensation (Summary Of Nonvested Shares) (Details) - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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, 2022(c) 828,551    
Granted 245,475    
Forfeitures (49,629)    
Dividend equivalent(d) 19,314    
Vested and distributed (299,438)    
Outstanding at December 31, 2022(c) 744,273 828,551  
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) $ 78.53    
Fair value of share units awarded 92.75 $ 87.11 $ 82.49
Weighted-average Fair Value per Unit, Unearned or forfeited (in dollars per share) 88.51    
Weighted-average Fair Value per Unit, Dividend Equivalent (in dollars per share) 87.19    
Weighted-average Fair Value per Unit, Vested and distributed (in dollars per share) 67.47    
Weighted-average Fair Value per Unit, Nonvested at end of year (in dollars per share) $ 87.23 $ 78.53  
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, 2022(c) 85,096    
Granted 39,771    
Forfeitures (8,134)    
Dividend equivalent(d) 3,131    
Vested and distributed (127)    
Outstanding at December 31, 2022(c) 119,737 85,096  
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) $ 77.39    
Fair value of share units awarded 87.83    
Weighted-average Fair Value per Unit, Unearned or forfeited (in dollars per share) 81.78    
Weighted-average Fair Value per Unit, Dividend Equivalent (in dollars per share) 81.00    
Weighted-average Fair Value per Unit, Vested and distributed (in dollars per share) 78.67    
Weighted-average Fair Value per Unit, Nonvested at end of year (in dollars per share) $ 80.65 $ 77.39  
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, 2022(c) 433,249    
Granted 146,955    
Forfeitures (24,386)    
Dividend equivalent(d) 11,126    
Vested and distributed (130,132)    
Outstanding at December 31, 2022(c) 436,812 433,249  
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) $ 73.98    
Fair value of share units awarded 88.27    
Weighted-average Fair Value per Unit, Unearned or forfeited (in dollars per share) 81.78    
Weighted-average Fair Value per Unit, Dividend Equivalent (in dollars per share) 80.84    
Weighted-average Fair Value per Unit, Vested and distributed (in dollars per share) 65.87    
Weighted-average Fair Value per Unit, Nonvested at end of year (in dollars per share) $ 80.94 $ 73.98