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Earnings Per Share Computations
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Earnings Per Share Computations
EARNINGS PER SHARE COMPUTATIONS

A reconciliation of basic and diluted earnings per share is below: 
(in millions, except per share amounts)
 
2017
 
2016
 
2015
Numerator
 
 

 
 

 
 

Net income
 
$
94.0

 
$
236.2

 
$
239.3

 
 
 
 
 
 
 
Denominator
 
 

 
 

 
 

Weighted-average common shares outstanding — basic
 
91.5

 
94.3

 
96.7

Dilutive shares
 
0.4

 
0.8

 
1.2

Weighted-average common and common equivalent shares outstanding — diluted
 
91.9

 
95.1

 
97.9

 
 
 
 
 
 
 
Per common share income
 
 

 
 

 
 

Basic
 
$
1.03

 
$
2.51

 
$
2.47

Diluted
 
$
1.02

 
$
2.48

 
$
2.44



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 0.4 million shares December 31, 2017. There were no anti-dilutive stock awards outstanding December 31, 2016 and 2015.