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Stock-Based Compensation (Summary Of Activity In Corporation's Active Stock Plans) (Details) (USD $)
3 Months Ended
Mar. 31, 2012
Mar. 31, 2012
Stock Options Outstanding [Member]
Mar. 31, 2012
Non-Vested Stock Awards/Stock Units Outstanding [Member]
Dec. 31, 2011
Non-Vested Stock Awards/Stock Units Outstanding [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Beginning Balance, Shares Available for Grant 1,963,455      
Beginning Balance, Director Deferred Stock Units Outstanding 22,092      
Beginning Balance, Number of Shares   4,968,822 169,530 169,530
Beginning Balance, Weighted-Average Grant-Date Fair Value     $ 50.33 $ 50.33
Beginning Balance, Weighted-Average Exercise Price   $ 51.49    
Stock options exercised, Number of Shares   (108,800)    
Stock options exercised, Weighted-Average Exercise Price   $ 50.94    
Forfeited, Shares Available for Grant 1,875      
Forfeited, Number of Shares   (1,875)    
Forfeited, Weighted-Average Exercise Price   $ 51.81    
Cancelled/expired, Shares Available for Grant (125)      
Ending Balance, Shares Available for Grant 1,965,205      
Ending Balance, Director Deferred Stock Units Outstanding 22,092      
Ending Balance, Number of Shares   4,858,147 169,530 169,530
Ending Balance, Weighted-Average Grant-Date Fair Value     $ 50.33 $ 50.33
Ending Balance, Weighted-Average Exercise Price   $ 51.50