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Earnings Per Share
 12 Months Ended
Dec. 31, 2014
Earnings Per Share [Abstract]  
Earnings Per Share

Note 4.    Earnings Per Share

 

Basic earnings per share is based on the weighted average number of common shares outstanding during the period. Diluted earnings per share includes the effect of options that are dilutive and outstanding during the period. Per share amounts are computed as follows:

 

     2014      2013      2012  

Numerator (in millions):

         

Net income available to common stockholders

    $ 84.1       $ 77.8       $ 66.9   
  

 

 

     

 

 

     

 

 

  

Denominator (in thousands):

         

Weighted average common shares outstanding

      24,391         23,651         23,187   

Dilutive effect of stock options and awards

      487         505         663   
  

 

 

     

 

 

     

 

 

  

Denominator for diluted earnings per share

      24,878         24,156         23,850   
  

 

 

     

 

 

     

 

 

  

Net income per share, basic:

    $ 3.45       $ 3.29       $ 2.89   
  

 

 

     

 

 

     

 

 

  

Net income per share, diluted:

    $ 3.38       $ 3.22       $ 2.81   
  

 

 

     

 

 

     

 

 

  

 

In 2014, 2013 and 2012 the average number of anti-dilutive options excluded from the calculation of diluted earnings per share were 36,775, nil and 1,380 respectively.