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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2017
Earnings Per Share [Abstract]  
Summary of Earnings Per Share

Per share amounts are computed as follows:

 

     Three Months Ended
March 31		  
     2017      2016  

Numerator (in millions):

      

Net income available to common stockholders

    $ 17.2      $ 18.9  
  

 

 

     

 

 

  

Denominator (in thousands):

      

Weighted average common shares outstanding

      24,087        24,019  

Dilutive effect of stock options and awards

      440        464  
  

 

 

     

 

 

  

Denominator for diluted earnings per share

      24,527        24,483  
  

 

 

     

 

 

  

Net income per share, basic:

    $ 0.71      $ 0.79  
  

 

 

     

 

 

  

Net income per share, diluted:

    $ 0.70      $ 0.77