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Net Earnings Per Common Share
6 Months Ended
Jun. 30, 2014
Net Earnings Per Common Share
Note 11.   Net Earnings Per Common Share

Basic net earnings per common share is computed using the weighted average common shares outstanding during the period. Diluted net earnings per common share is computed by using the weighted average common shares outstanding including the dilutive effect of stock options, shares issued under the Employee Stock Purchase Plan and restricted shares based on an average share price during the period. For the three month periods ended June 30, 2014 and 2013, approximately 0.0 and 0.1 shares and for the six month periods ended June 30, 2014 and 2013, approximately 0.0 and 0.1 shares of the Company’s common stock, respectively, were excluded from the determination of diluted earnings per common share because their effect would have been anti-dilutive. The computations of basic and diluted earnings per share for the three and six months ended June 30, 2014 and 2013, respectively, are as follows:
 
   
THREE MONTHS ENDED
   
SIX MONTHS ENDED
 
   
JUNE 30,
   
JUNE 30,
 
   
2014
   
2013
   
2014
   
2013
 
Net earnings
  $ 108.6     $ 92.4     $ 217.6     $ 182.3  
                                 
Basic weighted average common shares
    103.9       103.1       103.9       103.1  
Effect of dilutive stock options and
                               
    employee stock purchase plan shares
    0.1       0.1       0.1       0.1  
Effect of restricted shares issued
    0.5       0.7       0.4       0.6  
Diluted weighted average common shares
    104.5       103.9       104.4       103.8  
                                 
Basic net earnings per common share
  $ 1.05     $ 0.90     $ 2.09     $ 1.77  
Diluted net earnings per common share
  $ 1.04     $ 0.89     $ 2.08     $ 1.76