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Earnings per Share (Tables)
12 Months Ended
Dec. 31, 2022
Earnings Per Share [Abstract]  
Summary of Earnings Per Share Diluted earnings per share includes the effect of options that are dilutive and outstanding during the period. Per share amounts are computed as follows:
 
 
  
2022
 
  
2021
 
  
2020
 
Numerator (in millions):
                          
Net income available to common stockholders
   $ 133.0      $ 93.1      $ 28.7  
    
 
 
    
 
 
    
 
 
 
Denominator (in thousands):
                          
Weighted average common shares outstanding
     24,787        24,647        24,563  
Dilutive effect of stock options and awards
     195        207        216  
    
 
 
    
 
 
    
 
 
 
Denominator for diluted earnings per share
     24,982        24,854        24,779  
    
 
 
    
 
 
    
 
 
 
Net income per share, basic:
   $ 5.37      $ 3.78      $ 1.17  
    
 
 
    
 
 
    
 
 
 
Net income per share, diluted:
   $ 5.32      $ 3.75      $ 1.16