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Share-Based Compensation Plans (Share Options Outstanding And Exercisable) (Details) - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]    
Options Outstanding, Number Outstanding 170,704 170,704
Options Outstanding, Weighted Average-Remaining Contractual Life 1 year 4 months 24 days  
Options Outstanding, Weighted Average Exercise Price $ 87.18 $ 87.18
Exercise Prices Range 1 [Member]    
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]    
Ranges of Exercise Prices, Lower range limit 84.6300  
Ranges of Exercise Prices, Upper range limit $ 85.6300  
Options Outstanding, Number Outstanding 31,100 31,100
Options Outstanding, Weighted Average-Remaining Contractual Life 2 months 12 days  
Options Outstanding, Weighted Average Exercise Price $ 84.63 $ 84.63
Exercise Prices Range 2 [Member]    
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]    
Ranges of Exercise Prices, Lower range limit 85.6400  
Ranges of Exercise Prices, Upper range limit $ 87.4700  
Options Outstanding, Number Outstanding 59,900 59,900
Options Outstanding, Weighted Average-Remaining Contractual Life 1 year 2 months 12 days  
Options Outstanding, Weighted Average Exercise Price $ 86.62 $ 86.62
Exercise Prices Range 3 [Member]    
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]    
Ranges of Exercise Prices, Lower range limit 87.4800  
Ranges of Exercise Prices, Upper range limit $ 89.4100  
Options Outstanding, Number Outstanding 73,750 73,750
Options Outstanding, Weighted Average-Remaining Contractual Life 2 years 1 month 6 days  
Options Outstanding, Weighted Average Exercise Price $ 88.32 $ 88.32
Exercise Prices Range 4 [Member]    
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]    
Ranges of Exercise Prices, Lower range limit 89.4200  
Ranges of Exercise Prices, Upper range limit $ 110.1300  
Options Outstanding, Number Outstanding 5,954 5,954
Options Outstanding, Weighted Average-Remaining Contractual Life 1 year 6 months  
Options Outstanding, Weighted Average Exercise Price $ 91.99 $ 91.99