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Stock Incentive Plans And Stock Purchase Plan (Tables)
 12 Months Ended
Dec. 31, 2011
Stock Incentive Plans And Stock Purchase Plan [Abstract]  
Schedule Of Weighted Average Grant-Date Fair Values
     Number of
Shares		     Weighted
Average Fair
Value		  

Non-vested shares at January 1, 2011

      955,449      $ 50.08   

Awarded

      427,152      $ 70.99   

Forfeited

      (15,279 )    $ 54.58   

Vested

      (388,969 )    $ 48.84   
  

 

 

    

Non-vested shares at December 31, 2011

      978,353      $ 59.64   
  

 

 

    
Schedule Of Weighted Average Assumptions For Expected Volatility, Expected Life, Risk-Free Interest Rate And Dividend Yield
     Years Ended December 31,
     2011   2010   2009

Expected volatility

     35%   35%   32% to 37%

Expected life—officers (in years)

    4.5   4.5   4.5

Expected life—other employees (in years)

    3.5   3.5   3.5

Risk-free interest rate

    1.9%   2.1% to 2.3%   1.4% to 2.1%

Dividend yield

       0%   0%   0%
Schedule Of Activity And Certain Other Information Related To Stock Option Awards
     Number of
Shares		     Weighted
Average
Exercise
Price		      Weighted
Average
Remaining
Contractual
Term
(in years)		      Aggregate
Intrinsic
Value
(in millions)		  

Outstanding at January 1, 2011

      2,567,933      $ 44.50         

Granted

      41,400      $ 72.50         

Canceled

      (3,833 )    $ 37.59         

Exercised

      (551,927 )    $ 44.42          $ 14.1   
  

 

 

          

 

 

  

Outstanding at December 31, 2011

      2,053,573      $ 45.10         4.8       $ 55.3   
  

 

 

       

 

 

     

 

 

  

Exercisable at December 31, 2011

      1,910,919      $ 44.33         4.5       $ 52.9