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Earnings per Share (Tables)
9 Months Ended
Sep. 30, 2020
Earnings Per Share [Abstract]  
Summary of Earnings Per Share Per share amounts are computed as follows:
    
Three Months Ended
September 30
    
Nine Months Ended
September 30
 
    
2020
    
2019
    
2020
    
2019
 
Numerator (in millions):
           
Net income available to common stockholders
   $ 12.7      $ 30.1      $ 6.1      $ 81.1  
  
 
 
    
 
 
    
 
 
    
 
 
 
Denominator (in thousands):
           
Weighted average common shares outstanding
     24,570        24,491        24,555        24,476  
Dilutive effect of stock options and awards
     150        224        203        224  
  
 
 
    
 
 
    
 
 
    
 
 
 
Denominator for diluted earnings per share
     24,720        24,715        24,758        24,700  
  
 
 
    
 
 
    
 
 
    
 
 
 
Net income per share, basic:
   $ 0.52      $ 1.23      $ 0.25      $ 3.31  
  
 
 
    
 
 
    
 
 
    
 
 
 
Net income per share, diluted:
   $ 0.51      $ 1.22      $ 0.25      $ 3.28