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Earnings Per Share
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
EARNINGS PER SHARE

NOTE 3—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:

 

                 
    Three Months Ended
March 31		  
          2013                 2012        

Numerator (in millions):

                

Net income available to common stockholders

   $ 18.0     $ 24.6  
   

 

 

    

 

 

  

Denominator (in thousands):

                

Weighted average common shares outstanding

     23,404       23,055  

Dilutive effect of stock options and awards

     611       768  
   

 

 

    

 

 

  

Denominator for diluted earnings per share

     24,015       23,823  
   

 

 

    

 

 

  

Net income per share, basic:

   $ 0.77     $ 1.07  
   

 

 

    

 

 

  

Net income per share, diluted:

   $ 0.75     $ 1.03  
   

 

 

    

 

 

  

In the three months ended March 31, 2013 and 2012, the average number of anti-dilutive options excluded from the calculation of diluted earnings per share were 10,527 and 1,380, respectively.