Net Income Per Share (Tables)

6 Months Ended

Jun. 30, 2015

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,
	2015		2014		2015		2014
Numerator:
Net income	$	158.0	$	221.1	$	238.2	$	331.7
Denominator:
Weighted-average shares used to compute   basic net income per share	389.9		470.3		398.4		478.1
Dilutive effect of employee stock awards	7.3		6.2		7.7		9.2
Weighted-average shares used to compute   diluted net income per share	397.2		476.5		406.1		487.3
Net income per share attributable to Juniper   Networks common stockholders:
Basic	$	0.41	$	0.47	$	0.60	$	0.69
Diluted	$	0.40	$	0.46	$	0.59	$	0.68
Anti-dilutive:
Potential anti-dilutive shares	3.7		28.0		4.8		26.8