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Stock-Based Compensation (Summary Of Stock Options Outstanding Information) (Details) - Employee Stock Option [Member]
12 Months Ended
Dec. 31, 2018
$ / 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) $ 91.99
Number of Outstanding Options | shares 2,993,333
Weighted-Avg. Remaining Contractual Life-Yrs 6 years 175 days
Weighted-Avg. Exercise Price (in usd per share) $ 75.14
Number of Exercisable Options | shares 1,709,905
Weighted-Avg. Exercise Price (in usd per share) $ 75.64
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 2,229,833
Weighted-Avg. Remaining Contractual Life-Yrs 6 years 9 months 22 days
Weighted-Avg. Exercise Price (in usd per share) $ 73.88
Number of Exercisable Options | shares 946,405
Weighted-Avg. Exercise Price (in usd per share) $ 73.07
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 441,000
Weighted-Avg. Remaining Contractual Life-Yrs 6 years 30 days
Weighted-Avg. Exercise Price (in usd per share) $ 89.90
Number of Exercisable Options | shares 441,000
Weighted-Avg. Exercise Price (in usd per share) $ 89.90
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 322,500
Weighted-Avg. Remaining Contractual Life-Yrs 4 years 8 months 16 days
Weighted-Avg. Exercise Price (in usd per share) $ 63.70
Number of Exercisable Options | shares 322,500
Weighted-Avg. Exercise Price (in usd per share) $ 63.70