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Net Income per Share (Tables)
 12 Months Ended
Dec. 31, 2015
Earnings Per Share [Abstract]  
Schedule of Calculation of Basic and Diluted Net Income (Loss) Per Share
The Company computed basic and diluted net (loss) income per share attributable to Juniper Networks common stockholders as follows (in millions, except per share amounts):
 
Years Ended December 31,
 
2015
 
2014
 
2013
Numerator:
 
 
 
 
 
Net income (loss)
$
633.7

 
$
(334.3
)
 
$
439.8

Denominator:
 
 
 
 
 
Weighted-average shares used to compute basic net income (loss)
   per share
390.6

 
457.4

 
501.8

Dilutive effect of employee stock awards
8.8

 
—

 
8.5

Weighted-average shares used to compute diluted net income (loss)
   per share
399.4

 
457.4

 
510.3

Net income (loss) per share attributable to Juniper Networks common
   stockholders:
 
 
 
 
 
Basic
$
1.62

 
$
(0.73
)
 
$
0.88

Diluted
$
1.59

 
$
(0.73
)
 
$
0.86

 
 
 
 
 
 
Anti-dilutive:
 
 
 
 
 
Potential anti-dilutive shares
3.4

 
20.8

 
13.2