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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2013
Earnings Per Share [Abstract]  
Denominator For Basic And Diluted Earnings Per Share
  Three Months Ended Six Months Ended
  June 30 June 30
  2013 2012 2013 2012
         
Denominator for basic earnings per share – weighted average shares 299.5  327.7  301.3  331.3
Effect of dilutive securities – employee and director stock options       
 and non-vested restricted stock awards 3.7  3.5  3.2  3.8
         
Denominator for diluted earnings per share 303.2  331.2  304.5  335.1