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Stock Incentive Plans And Stock Purchase Plan (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
years
Dec. 31, 2010
Dec. 31, 2009
Class of Stock [Line Items]      
Shares available for future grants and awards under Stock Incentive Plans 1,300,000    
Weighted average grant-date fair value of restricted and deferred stock awards granted $ 70.99 $ 54.90 $ 41.74
Stock-based compensation expense related to its Stock Incentive Plans and Stock Purchase Plan $ 27,100,000 $ 25,700,000 $ 24,300,000
Aggregate fair value of restricted shares, vested 19,000,000 14,400,000 9,700,000
Stock-based compensation cost related to non-vested, weighted-average period in years 1.5    
Stock-based compensation cost related to non-vested restricted and deferred stock expense 28,100,000    
Estimate fair value of stock option grant $ 23.27 $ 18.89 $ 12.19
Stock-based compensation cost related to non-vested stock options remaining to be recognized as compensation expense, weighted-average period in years 1.3    
Stock-based compensation cost related to non-vested stock options remaining to be recognized as compensation expense 900,000    
Excess tax benefit related to employee stock incentive plans 7,111,000 3,046,000 6,877,000
Cash proceeds received from the exercise of stock options 24,500,000 16,400,000 12,500,000
Aggregate intrinsic value of stock options exercised $ 14,100,000 $ 9,100,000 $ 21,800,000
1996 Non-Qualified Employee Stock Purchase Plan [Member]
      
Class of Stock [Line Items]      
Percentage of market value of common stock at which employees are permitted to purchase 85.00%    
Percentage of discount received by participating employees 15.00%    
Shares issued under Non-Qualified Plan 118,828    
Shares reserved for issuance under the Non-Qualified Plan 555,000    
Stock Options [Member]
      
Class of Stock [Line Items]      
Vesting period of options, maximum years 10    
Number of years over which options become exercisable on a pro rata basis 3    
Restricted Stock [Member]
      
Class of Stock [Line Items]      
Vesting period of options, years three    
Deferred Stock Awards [Member]
      
Class of Stock [Line Items]      
Vesting period of options, years five