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Net Income Per Share
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Net Income Per Share
Net Income per Share

The Company computed basic and diluted net income per share as follows (in millions, except per share amounts):
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net income
$
165.7

 
$
172.4

 
$
454.3

 
$
403.8

Denominator:
 
 
 
 
 
 
 
Weighted-average shares used to compute basic net income per share
378.3

 
381.0

 
380.0

 
382.3

Dilutive effect of employee stock awards
4.4

 
3.5

 
6.5

 
5.6

Weighted-average shares used to compute diluted net income per share
382.7

 
384.5

 
386.5

 
387.9

Net income per share
 
 
 
 
 
 
 
Basic
$
0.44

 
$
0.45

 
$
1.20

 
$
1.06

Diluted
$
0.43

 
$
0.45

 
$
1.18

 
$
1.04

 
 
 
 
 
 
 
 
Anti-dilutive shares
1.0

 
2.7

 
1.2

 
2.7