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Stock-Based Compensation (Summary Of Stock Options Outstanding Information) (Details) - Employee Stock Option [Member]
12 Months Ended
Dec. 31, 2019
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, minimum (in usd per share) $ 51
Exercise Price, maximum (in usd per share) $ 89.90
Number of Outstanding Options | shares 2,448,913
Weighted-Avg. Remaining Contractual Life-Yrs 7 years 10 days
Weighted-Avg. Exercise Price (in usd per share) $ 78.48
Number of Exercisable Options | shares 1,160,665
Weighted-Avg. Exercise Price (in usd per share) $ 73.97
Range Of Exercise Prices 2 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, minimum (in usd per share) 65
Exercise Price, maximum (in usd per share) $ 78.99
Number of Outstanding Options | shares 1,323,452
Weighted-Avg. Remaining Contractual Life-Yrs 6 years 10 months 20 days
Weighted-Avg. Exercise Price (in usd per share) $ 73.97
Number of Exercisable Options | shares 694,093
Weighted-Avg. Exercise Price (in usd per share) $ 72.50
Range Of Exercise Prices 3 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, minimum (in usd per share) 79
Exercise Price, maximum (in usd per share) $ 91.99
Number of Outstanding Options | shares 881,261
Weighted-Avg. Remaining Contractual Life-Yrs 8 years 1 month 24 days
Weighted-Avg. Exercise Price (in usd per share) $ 89.36
Number of Exercisable Options | shares 222,372
Weighted-Avg. Exercise Price (in usd per share) $ 89.85
Range Of Exercise Prices1 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price, minimum (in usd per share) 51
Exercise Price, maximum (in usd per share) $ 64.99
Number of Outstanding Options | shares 244,200
Weighted-Avg. Remaining Contractual Life-Yrs 3 years 8 months 19 days
Weighted-Avg. Exercise Price (in usd per share) $ 63.69
Number of Exercisable Options | shares 244,200
Weighted-Avg. Exercise Price (in usd per share) $ 63.69