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Share-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2011
Share-Based Compensation [Abstract] 
Schedule Of Weighted Average Option Fair Values And Assumptions
     Three Months Ended September 30,
               2011                        2010           

Weighted average fair value of grants

   $11.66   $ 8.01

Dividend yield

   1.63%   2.05%

Volatility

   31.84%   33.01%

Risk-free forward interest rate

   0.18% - 5.15%   0.31% - 4.88%

Expected life (in years)

   6.08   5.96
     Nine Months Ended September 30,
               2011                        2010           

Weighted average fair value of grants

   $ 12.31   $ 9.53

Dividend yield

   1.45%   1.51%

Volatility

   32.72%   33.44%

Risk-free forward interest rate

   0.28% - 5.62%   0.32% - 5.68%

Expected life (in years)

   6.14   5.98
Schedule Of Compensation Cost For Stock Options And Unvested Shares