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Share-Based Compensation Plans (Schedule Of Restricted Stock, RSUs, Performance Restricted Stock and PSUs Activity) (Details)
12 Months Ended
Dec. 31, 2022
$ / shares
shares
RSUs [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning balance, Number of shares | shares 65,000.0
Granted, Number of shares | shares 77,300
Vested, Number of shares | shares (24,100)
Forfeited, Number of shares | shares (6,100)
Ending balance, Number of shares | shares 112.1
Beginning balance, Weighted-average fair value at grant date | $ / shares $ 87.94
Granted, Weighted-average fair value at grant date | $ / shares 86.98
Vested, Weighted-average fair value at grant date | $ / shares (90.32)
Forfeited, Weighted-average fair value at grant date | $ / shares (87.60)
Ending balance, Weighted-average fair value at grant date | $ / shares $ 86.66
PSUs [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning balance, Number of shares | shares 301,800
Granted, Number of shares | shares 118,200
Performance adjustments, Number of shares | shares (27,500)
Vested, Number of shares | shares (74,400)
Forfeited, Number of shares | shares (11,700)
Ending balance, Number of shares | shares 306,400
Beginning balance, Weighted-average fair value at grant date | $ / shares $ 92.74
Granted, Weighted-average fair value at grant date | $ / shares 96.67
Performance adjustments, Weighted-average fair value at grant date | $ / shares (71.84)
Vested, Weighted-average fair value at grant date | $ / shares (77.80)
Forfeited, Weighted-average fair value at grant date | $ / shares (102.92)
Ending balance, Weighted-average fair value at grant date | $ / shares $ 99.38
Restricted Stock [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning balance, Number of shares | shares 72,600
Vested, Number of shares | shares (20,400)
Forfeited, Number of shares | shares (1,500)
Ending balance, Number of shares | shares 50,700
Beginning balance, Weighted-average fair value at grant date | $ / shares $ 77.99
Vested, Weighted-average fair value at grant date | $ / shares (77.90)
Forfeited, Weighted-average fair value at grant date | $ / shares (77.22)
Ending balance, Weighted-average fair value at grant date | $ / shares $ 78.05