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Stock-Based Compensation Plans (Summary Of Restricted Stock Units Activity) (Details) - Restricted Stock Units (RSUs) [Member] - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
May 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding, as of December 31   376,835    
Granted   22,867    
Converted   (57,928)    
Forfeited 31,000 546    
Outstanding, as of December 31   341,228 376,835  
Vested   312,872    
Weighted Average Grant-Date Fair Value Per Share, Outstanding as of December 31   $ 143.70    
Weighted Average Grant-Date Fair Value Per Share, Nonvested, Granted   488.27 $ 366.07 $ 436.89
Weighted Average Grant-Date Fair Value Per Share, Nonvested, Converted   126.25    
Weighted Average Grant-Date Fair Value Per Share, Nonvested, Forfeited   437.63    
Weighted Average Grant-Date Fair Value Per Share, Outstanding as of December 31   169.28 $ 143.70  
Weighted Average Grant-Date Fair Value Per Share, Vested as of December 31   $ 142.40    
Aggregate Intrinsic Value, Outstanding [1]   $ 161.9    
Aggregate Intrinsic Value, Vested [1]   $ 148.4    
Weighted Average Remaining Contractual Term, Outstanding   1 year 7 months 6 days    
Weighted Average Remaining Contractual Term, Vested   1 year 4 months 24 days    
[1] The intrinsic value of RSUs is measured by applying the closing stock price as of December 31, 2022 to the applicable number of units.