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Stock Incentive Plans And Stock Purchase Plan (Schedule Of Activity And Certain Other Information Related To Stock Option Awards) (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Stock Incentive Plans And Stock Purchase Plan [Abstract]      
Number of Shares, Outstanding at January 1, 2011 2,567,933    
Number of Shares, Granted 41,400    
Number of Shares, Canceled (3,833)    
Number of Shares, Exercised (551,927)    
Number of Shares, Outstanding at December 31, 2011 2,053,573 2,567,933  
Number of Shares, Exercisable at December 31, 2011 1,910,919    
Weighted Average Exercise Price, Outstanding at January 1, 2011 $ 44.50    
Weighted Average Exercise Price, Granted $ 72.50    
Weighted Average Exercise Price, Canceled $ 37.59    
Weighted Average Exercise Price, Exercised $ 44.42    
Weighted Average Exercise Price, Outstanding at December 31, 2011 $ 45.10 $ 44.50  
Weighted Average Exercise Price, Exercisable at December 31, 2011 $ 44.33    
Weighted Average Remaining Contractual Term (in years), Outstanding at December 31, 2011 4.8    
Weighted Average Remaining Contractual Term (in years), Exercisable at December 31, 2011 4.5    
Aggregate Intrinsic Value, Exercised $ 14.1 $ 9.1 $ 21.8
Aggregate Intrinsic Value, Outstanding at December 31, 2011 55.3    
Aggregate Intrinsic Value, Exercisable at December 31, 2011 $ 52.9