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Net Income Per Share
 12 Months Ended
Dec. 31, 2016
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,
 
2016
 
2015
 
2014
Net income
$
735.9

 
$
588.8

 
$
418.8

Basic:
 
 
 
 
 
Weighted-average shares outstanding
38.3

 
37.1

 
36.9

Basic net income per share
$
19.21

 
$
15.87

 
$
11.35

Diluted:
 
 
 
 
 
Weighted-average shares outstanding used in basic calculation
38.3

 
37.1

 
36.9

Add: Dilutive potential shares
1.0

 
0.8

 
0.8

Weighted-average shares used in computing diluted net income per share
39.3

 
37.9

 
37.7

Diluted net income per share
$
18.73

 
$
15.54

 
$
11.11


Share-based compensation awards of approximately 0.2 million, 1.7 million, and 2.4 million shares for the years ended December 31, 2016, 2015, and 2014, 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 antidilutive in the periods presented.