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Earnings per Share (Tables)
3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Summary of Earnings Per Share Per share amounts are computed as follows:
 
 
 
Three Months Ended

March 31
 
 
 
2019
 
 
2018
 
Numerator (in millions):
 
 
 
 
 
 
 
 
Net income available to common stockholders
 
$
28.7
 
 
$
22.2
 
Denominator (in thousands):
 
 
 
 
 
 
 
 
Weighted average common shares outstanding
 
 
24,437
 
 
 
24,369
 
Dilutive effect of stock options and awards
 
 
157
 
 
 
205
 
Denominator for diluted earnings per share
 
 
24,594
 
 
 
24,574
 
Net income per share, basic:
 
$
1.17
 
 
$
0.91
 
Net income per share, diluted:
 
$
1.17
 
 
$
0.90