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Net Earnings Per Share
12 Months Ended
Dec. 31, 2013
Net Earnings Per Share  
Net Earnings Per Share

6.     Net Earnings Per Share

        The net earnings per share were computed as follows:

 
  Year ended December 31,  
 
  2013   2012   2011  
 
  (in millions, except
per share amounts)

 

Net earnings attributable to common stockholders

  $ 1,464.6   $ 1,848.7   $ 1,539.2  
               
               

Basic earnings per common share:

                   

Weighted average common shares outstanding

    58.9     63.9     69.4  
               
               

Net earnings attributable to common stockholders

  $ 24.87   $ 28.94   $ 22.18  
               
               

Diluted earnings per common share:

                   

Weighted average common shares outstanding

    58.9     63.9     69.4  

Dilutive common shares—stock options

    0.3     0.8     0.6  
               

Diluted weighted average shares outstanding

    59.2     64.7     70.0  
               
               

Net earnings attributable to common stockholders

  $ 24.74   $ 28.59   $ 21.98  
               
               

        In the computation of diluted net earnings per common share, potentially dilutive stock options are excluded if the effect of their inclusion is anti-dilutive. For the years ended December 31, 2013, 2012 and 2011, anti-dilutive stock options were insignificant.