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Net Income Per Share
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Net Income Per Share
NET INCOME PER SHARE
The following table presents the computation of basic and diluted net income per share (in millions, except per share amounts):
 
Years Ended December 31,
 
2017
 
2016
 
2015
Numerator:
 
 
 
 
 
Net income
$
660.0

 
$
735.9

 
$
588.8

Denominator:
 
 
 
 
 
Weighted-average shares outstanding in basic calculation
111.7

 
114.9

 
111.3

Add: dilutive effect of potential common shares
4.6

 
3.0

 
2.4

Weighted-average shares used in computing diluted net income per share
116.3

 
117.9

 
113.7

Net income per share:
 
 
 
 
 
Basic
$
5.91

 
$
6.40

 
$
5.29

Diluted
$
5.67

 
$
6.24

 
$
5.18


Share-based compensation awards of approximately 0.2 million, 0.6 million, and 5.0 million shares for the years ended December 31, 2017, 2016, and 2015, respectively, were outstanding, but were not included in the computation of diluted net income per share because the effect of including such shares would have been anti-dilutive in the periods presented.