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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2013
Earnings Per Share [Abstract]  
Summary of Earnings per share
                 
    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