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Stock-Based Compensation (Summary Of Stock Option Activity) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning balance 2,448,913    
Options outstanding, Weighted-average exercise price, Beginning balance (in usd per share) $ 78.48    
Number of options granted 530,716    
Options granted, Weighted-average exercise price (in usd per share) $ 131.72    
Number of options exercised (544,082)    
Options exercised, Weighted-average exercise price (in usd per share) $ 79.27    
Number of Options forfeited/expired (36,168)    
Options forfeited/expired, Weighted-average exercise price (in usd per share) $ 108.69    
Number of options outstanding, Ending balance 2,399,379 2,448,913  
Options outstanding, Weighted-average exercise price, Ending balance (in usd per share) $ 89.63 $ 78.48  
Weighted-Average Contractual Life, Options outstanding 6 years 8 months 19 days    
Options exercisable, Number of Options 1,264,641    
Options exercisable, Weighted-Average Exercise Price (in usd per share) $ 74.55    
Options exercisable, Aggregate intrinsic value (in usd per share) $ 31,979,370    
Weighted-Average Contractual Life, Options exercisable 5 years 3 months 3 days    
Weighted-average grant-date fair value of options granted (in USD per share) $ 11.45 $ 8.32 $ 6.99
Restricted Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning balance 692,134    
Options outstanding, Weighted-average exercise price, Beginning balance (in usd per share) $ 82.56    
Number of options granted 336,363    
Options granted, Weighted-average exercise price (in usd per share) $ 130.11    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (345,271)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price $ 79.41    
Number of Options forfeited/expired (34,728)    
Options forfeited/expired, Weighted-average exercise price (in usd per share) $ 101.32    
Number of options outstanding, Ending balance 648,498 692,134  
Options outstanding, Weighted-average exercise price, Ending balance (in usd per share) $ 107.89 $ 82.56  
Long-Term Incentive Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning balance 551,933    
Options outstanding, Weighted-average exercise price, Beginning balance (in usd per share) $ 84.01    
Number of options granted 376,557    
Options granted, Weighted-average exercise price (in usd per share) $ 105.90    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (423,225)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price $ 71.40    
Number of Options forfeited/expired (29,500)    
Options forfeited/expired, Weighted-average exercise price (in usd per share) $ 111.86    
Number of options outstanding, Ending balance 475,765 551,933  
Options outstanding, Weighted-average exercise price, Ending balance (in usd per share) $ 110.82 $ 84.01  
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of options outstanding, Beginning balance 130,463    
Options outstanding, Weighted-average exercise price, Beginning balance (in usd per share) $ 82.72    
Number of options granted 18,100    
Options granted, Weighted-average exercise price (in usd per share) $ 114.30    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested, Number of Shares (55,888)    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Exercise Price $ 77.04    
Number of Options forfeited/expired (6,500)    
Options forfeited/expired, Weighted-average exercise price (in usd per share) $ 84.32    
Number of options outstanding, Ending balance 86,175 130,463  
Options outstanding, Weighted-average exercise price, Ending balance (in usd per share) $ 92.92 $ 82.72