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Earnings per Share (Tables)
3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Summary of Earnings Per Share Per share amounts are computed as follows:
                 
 
Three Months Ended
March 31
 
 
2020
 
 
2019
 
Numerator (in millions):
   
     
 
Net income available to common stockholders
  $
 33.1
    $
 28.7
 
                 
Denominator (in thousands):
   
     
 
Weighted average common shares outstanding
   
24,529
     
24,437
 
Dilutive effect of stock options and awards
   
213
     
157
 
                 
Denominator for diluted earnings per share
   
24,742
     
24,594
 
                 
Net income per share, basic:
  $
 1.35
    $
 1.17
 
                 
Net income per share, diluted:
  $
 1.34
    $
 1.17