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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, 2021
$ / shares
shares
RSUs [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning balance, Number of shares | shares 66,800
Granted, Number of shares | shares 23,600
Vested, Number of shares | shares (22,100)
Forfeited, Number of shares | shares (3,300)
Ending balance, Number of shares | shares 65,000.0
Beginning balance, Weighted-average fair value at grant date | $ / shares $ 83.14
Granted, Weighted-average fair value at grant date | $ / shares 92.30
Vested, Weighted-average fair value at grant date | $ / shares (78.32)
Forfeited, Weighted-average fair value at grant date | $ / shares (86.23)
Ending balance, Weighted-average fair value at grant date | $ / shares $ 87.94
PSUs [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning balance, Number of shares | shares 330,300
Granted, Number of shares | shares 113,800
Performance adjustments, Number of shares | shares 23,100
Vested, Number of shares | shares (148,400)
Forfeited, Number of shares | shares (17,000.0)
Ending balance, Number of shares | shares 301,800
Beginning balance, Weighted-average fair value at grant date | $ / shares $ 75.49
Granted, Weighted-average fair value at grant date | $ / shares 102.46
Performance adjustments, Weighted-average fair value at grant date | $ / shares 52.56
Vested, Weighted-average fair value at grant date | $ / shares (55.63)
Forfeited, Weighted-average fair value at grant date | $ / shares (93.03)
Ending balance, Weighted-average fair value at grant date | $ / shares $ 92.74
Restricted Stock [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Beginning balance, Number of shares | shares 94,200
Vested, Number of shares | shares (21,100)
Forfeited, Number of shares | shares (500)
Ending balance, Number of shares | shares 72,600
Beginning balance, Weighted-average fair value at grant date | $ / shares $ 77.96
Vested, Weighted-average fair value at grant date | $ / shares (77.88)
Forfeited, Weighted-average fair value at grant date | $ / shares (77.22)
Ending balance, Weighted-average fair value at grant date | $ / shares $ 77.99