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Earnings Per Share Computations
 9 Months Ended
Sep. 30, 2018
Earnings Per Share [Abstract]  
Earnings Per Share Computations
Earnings Per Share Computations
 
A reconciliation of basic and diluted earnings per share is below: 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(in millions, except per share amounts)
 
2018
 
2017
 
2018
 
2017
Numerator
 
 

 
 

 
 

 
 

Net income
 
$
57.5

 
$
55.6

 
$
151.8

 
$
134.7

 
 
 
 
 
 
 
 
 
Denominator
 
 

 
 

 
 

 
 

Weighted average common shares outstanding — basic
 
91.0

 
90.9

 
91.0

 
91.8

Dilutive shares
 
0.6

 
0.3

 
0.3

 
0.3

Weighted average common and common equivalent shares outstanding — diluted
 
91.6

 
91.2

 
91.3

 
92.1

 
 
 
 
 
 
 
 
 
Per common share income
 
 

 
 

 
 

 
 

Basic
 
$
0.63

 
$
0.61

 
$
1.66

 
$
1.47

Diluted
 
$
0.63

 
$
0.61

 
$
1.66

 
$
1.46



     Certain stock awards outstanding were not included in the computation of diluted earnings per share above because they would not have had a dilutive effect. There were no excluded stock awards for the three and nine months ended September 30, 2018. The excluded stock awards represented an aggregate of 0.6 million shares for the three and nine months ended September 30, 2017.