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Net Income per Share (Tables)
9 Months Ended
Sep. 30, 2011
Earnings Per Share [Abstract] 
Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]
The following table presents the calculation of basic and diluted net income per share attributable to Juniper Networks common stockholders (in millions, except per share amounts):

 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2011
 
2010
 
2011
 
2010
Numerator:
 
 
 
 
 
 
 
Net income attributable to Juniper Networks
$
83.7

 
$
134.5

 
$
329.0

 
$
428.2

Denominator:
 
 
 
 
 
 
 
Weighted-average shares used to compute basic net income per share
529.3

 
520.6

 
531.0

 
522.1

Effect of dilutive securities:
 
 
 
 
 
 
 
Employee stock awards
7.3

 
14.3

 
13.1

 
15.1

Weighted-average shares used to compute diluted net income per share
536.6

 
534.9

 
544.1

 
537.2

Net income per share attributable to Juniper Networks common stockholders:
 
 
 
 
 
 
 
Basic
$
0.16

 
$
0.26

 
$
0.62

 
$
0.82

Diluted
$
0.16

 
$
0.25

 
$
0.60

 
$
0.80