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Earnings Per Share Computations
 3 Months Ended
Mar. 31, 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 March 31,
(in millions, except per share amounts)
 
2018
 
2017
Numerator
 
 

 
 

Net income
 
$
47.6

 
$
51.1

 
 
 
 
 
Denominator
 
 

 
 

Weighted average common shares outstanding — basic
 
91.0

 
92.4

Dilutive shares
 
0.2

 
0.4

Weighted average common and common equivalent shares outstanding — diluted
 
91.2

 
92.8

 
 
 
 
 
Per common share income
 
 

 
 

Basic
 
$
0.52

 
$
0.55

Diluted
 
$
0.52

 
$
0.55



     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. The excluded stock awards represented an aggregate of 0.8 million and 0.5 million shares for the three months ended March 31, 2018 and 2017, respectively.