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Net Income per Share
 6 Months Ended
Jun. 30, 2014
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 June 30,
 
Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
Numerator:
 
 
 
 
 
 
 
Net income
$
221.1

 
$
97.9

 
$
331.7

 
$
188.9

Denominator:
 
 
 
 
 
 
 
Weighted-average shares used to compute
  basic net income per share
470.3

 
503.0

 
478.1

 
503.8

Dilutive effect of employee stock awards
6.2

 
3.3

 
9.2

 
6.6

Weighted-average shares used to compute
  diluted net income per share
476.5

 
506.3

 
487.3

 
510.4

Net income per share:
 
 
 
 
 
 
 
Basic
$
0.47

 
$
0.19

 
$
0.69

 
$
0.37

Diluted
$
0.46

 
$
0.19

 
$
0.68

 
$
0.37

 
 
 
 
 
 
 
 
Anti-dilutive:
 
 
 
 
 
 
 
Potential anti-dilutive shares
28.0

 
39.4

 
26.8

 
24.3



Basic net income per share is computed using net income available to common stockholders and the weighted-average number of common shares outstanding for the period. Diluted net income per share is computed using net income available to common stockholders and the weighted-average number of common shares outstanding plus potentially dilutive common shares outstanding during the period. Dilutive potential common shares consist of common shares issuable upon exercise of stock options, issuances of ESPP, and vesting of RSUs, RSAs, and PSAs. The Company includes the common shares underlying PSAs in the calculation of diluted net income per share when they become contingently issuable and excludes such shares when they are not contingently issuable. Potentially dilutive common shares were excluded from the computation of diluted net income per share because their effect would be anti-dilutive.