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Stock-Based Compensation (Summary Of Stock Option Activity) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning balance 2,993,333    
Options outstanding, Weighted-average exercise price, Beginning balance (in usd per share) $ 75.14    
Number of options granted 693,161    
Options granted, Weighted-average exercise price (in usd per share) $ 89.19    
Number of options exercised (1,227,047)    
Options exercised, Weighted-average exercise price (in usd per share) $ 76.35    
Number of Options forfeited/expired (10,534)    
Options forfeited/expired, Weighted-average exercise price (in usd per share) $ 81.68    
Number of options outstanding, Ending balance 2,448,913 2,993,333  
Options outstanding, Weighted-average exercise price, Ending balance (in usd per share) $ 78.48 $ 75.14  
Weighted-Average Contractual Life, Options outstanding 7 years 10 days    
Options exercisable, Number of Options 1,160,665    
Options exercisable, Weighted-Average Exercise Price (in usd per share) $ 73.97    
Options exercisable, Aggregate intrinsic value (in usd per share) $ 53,192,483    
Weighted-Average Contractual Life, Options exercisable 5 years 5 months 19 days    
Weighted-average grant-date fair value of options granted (in USD per share) $ 8.32 $ 6.99 $ 6.54
Restricted Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning balance 693,527    
Options outstanding, Weighted-average exercise price, Beginning balance (in usd per share) $ 74.17    
Number of options granted 379,690    
Options granted, Weighted-average exercise price (in usd per share) $ 88.75    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (346,842)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price $ 72.96    
Number of Options forfeited/expired (34,241)    
Options forfeited/expired, Weighted-average exercise price (in usd per share) $ 78.66    
Number of options outstanding, Ending balance 692,134 693,527  
Options outstanding, Weighted-average exercise price, Ending balance (in usd per share) $ 82.56 $ 74.17  
Long-Term Incentive Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning balance 566,626    
Options outstanding, Weighted-average exercise price, Beginning balance (in usd per share) $ 79.21    
Number of options granted 241,406    
Options granted, Weighted-average exercise price (in usd per share) $ 96.18    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (226,252)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price $ 84.52    
Number of Options forfeited/expired (29,847)    
Options forfeited/expired, Weighted-average exercise price (in usd per share) $ 87.43    
Number of options outstanding, Ending balance 551,933 566,626  
Options outstanding, Weighted-average exercise price, Ending balance (in usd per share) $ 84.01 $ 79.21  
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning balance 186,763    
Options outstanding, Weighted-average exercise price, Beginning balance (in usd per share) $ 76.43    
Number of options granted 26,700    
Options granted, Weighted-average exercise price (in usd per share) $ 109.10    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (83,000)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price $ 77.05    
Number of options outstanding, Ending balance 130,463 186,763  
Options outstanding, Weighted-average exercise price, Ending balance (in usd per share) $ 82.72 $ 76.43