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Earnings per Share (Tables)
 6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Summary of Earnings Per Share Per share amounts are computed as follows:
                                 
 
Three Months Ended
June 30
   
Six Months Ended
June 30
 
 
2019
   
2018
   
2019
   
2018
 
Numerator (in millions):
   
     
     
     
 
Net income available to common stockholders
  $
22.3
    $
21.8
    $
51.0
    $
44.0
 
                                 
Denominator (in thousands):
   
     
     
     
 
Weighted average common shares outstanding
   
24,483
     
24,409
     
24,468
     
24,389
 
Dilutive effect of stock options and awards
   
195
     
182
     
203
     
195
 
                                 
Denominator for diluted earnings per share
   
24,678
     
24,591
     
24,671
     
24,584
 
                                 
Net income per share, basic:
  $
0.91
    $
0.89
    $
2.08
    $
1.80
 
                                 
Net income per share, diluted:
  $
0.90
    $
0.89
    $
2.07
    $
1.79