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Earnings per Share (Tables)
 3 Months Ended
Mar. 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 under the treasury stock method. Per share amounts are computed as follows:
    
Three Months Ended
March 31
  
    
2022
     
2021
  
Numerator (in millions):
                  
Net income available to common stockholders
    $ 36.5      $ 23.4  
    
 
 
     
 
 
  
Denominator (in thousands):
                  
Weighted average common shares outstanding
      24,791        24,601  
Dilutive effect of stock options and awards
      165        239  
    
 
 
     
 
 
  
Denominator for diluted earnings per share
      24,956        24,840  
    
 
 
     
 
 
  
Net income per share, basic:
   
$
1.47
 
   
$
0.95
 
    
 
 
     
 
 
  
Net income per share, diluted:
   
$
1.46
 
   
$
0.94