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Earnings per Share (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Summary of Earnings Per Share Per share amounts are computed as follows:
                         
 
2019
 
 
2018
 
 
2017
 
Numerator (in millions):
 
 
 
 
 
 
 
 
 
Net income available to common stockholders
 
$
112.2
 
 
 
$
85.0
 
 
 
$
61.8
 
 
 
 
 
  
 
 
 
  
 
 
 
 
Denominator (in thousands):
 
 
 
 
 
 
 
 
 
                         
Weighted average common shares outstanding
   
24,482
     
24,401
     
24,148
 
Dilutive effect of stock options and awards
   
246
     
202
     
338
 
                         
Denominator for diluted earnings per share
   
24,728
     
24,603
     
24,486
 
                         
Net income per share, basic:
  $
4.58
    $
3.48
    $
2.56
 
                         
Net income per share, diluted:
  $
4.54
    $
3.45
    $
2.52