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Stock-Based Compensation (Summary Of Stock Option Activity) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning balance 5,164,854    
Options outstanding, Weighted-average exercise price, Beginning balance (in usd per share) $ 83.26    
Number of options granted 687,400    
Options granted, Weighted-average exercise price (in usd per share) $ 78.08    
Number of options exercised (1,419,087)    
Options exercised, Weighted-average exercise price (in usd per share) $ 72.76    
Number of Options forfeited/expired (1,439,834)    
Options forfeited/expired, Weighted-average exercise price (in usd per share) $ 108.00    
Number of options outstanding, Ending balance 2,993,333 5,164,854  
Options outstanding, Weighted-average exercise price, Ending balance (in usd per share) $ 75.14 $ 83.26  
Weighted-Average Contractual Life, Options outstanding 6 years 5 months 23 days    
Options exercisable, Number of Options 1,709,905    
Options exercisable, Weighted-Average Exercise Price (in usd per share) $ 75.64    
Options exercisable, Aggregate intrinsic value (in usd per share) $ 17,826,376    
Weighted-Average Contractual Life, Options exercisable 4 years 11 months 28 days    
Weighted-average grant-date fair value of options granted (in USD per share) $ 6.99 $ 6.54 $ 7.40
Restricted Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning balance 709,611    
Options outstanding, Weighted-average exercise price, Beginning balance (in usd per share) $ 72.92    
Number of options granted 364,306    
Options granted, Weighted-average exercise price (in usd per share) $ 77.75    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (332,614)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price $ 75.54    
Number of Options forfeited/expired (47,777)    
Options forfeited/expired, Weighted-average exercise price (in usd per share) $ 73.37    
Number of options outstanding, Ending balance 693,526 709,611  
Options outstanding, Weighted-average exercise price, Ending balance (in usd per share) $ 74.17 $ 72.92  
Long-Term Incentive Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning balance 534,151    
Options outstanding, Weighted-average exercise price, Beginning balance (in usd per share) $ 83.60    
Number of options granted 199,859    
Options granted, Weighted-average exercise price (in usd per share) $ 82.03    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (50,812)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price $ 99.02    
Number of Options forfeited/expired (116,572)    
Options forfeited/expired, Weighted-average exercise price (in usd per share) $ 95.51    
Number of options outstanding, Ending balance 566,626 534,151  
Options outstanding, Weighted-average exercise price, Ending balance (in usd per share) $ 79.21 $ 83.60  
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning balance 201,570    
Options outstanding, Weighted-average exercise price, Beginning balance (in usd per share) $ 75.48    
Number of options granted 22,850    
Options granted, Weighted-average exercise price (in usd per share) $ 79.11    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (37,657)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price $ 72.97    
Number of options outstanding, Ending balance 186,763 201,570  
Options outstanding, Weighted-average exercise price, Ending balance (in usd per share) $ 76.43 $ 75.48