Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2016

Earnings Per Share [Abstract]

Schedule of earnings per share, basic and diluted

The Company computed basic and diluted net income per share attributable to Juniper Networks common stockholders as follows (in millions, except per share amounts):

	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Numerator:
Net income	$	140.0	$	158.0	$	231.4	$	238.2
Denominator:
Weighted-average shares used to compute basic net   income per share	382.8		389.9		383.0		398.4
Dilutive effect of employee stock awards	3.5		7.3		5.6		7.7
Weighted-average shares used to compute diluted   net income per share	386.3		397.2		388.6		406.1
Net income per share
Basic	$	0.37	$	0.41	$	0.60	$	0.60
Diluted	$	0.36	$	0.40	$	0.60	$	0.59
Anti-dilutive:
Potential anti-dilutive shares	8.0		3.7		2.7		4.8