Net Income Per Share (Tables)

9 Months Ended

Sep. 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 September 30,				Nine Months Ended September 30,
	2015		2014		2015		2014
Numerator:
Net income	$	197.7	$	103.6	$	435.9	$	435.3
Denominator:
Weighted-average shares used to compute   basic net income per share	382.8		448.4		393.2		468.1
Dilutive effect of employee stock awards	6.4		6.4		8.0		8.9
Weighted-average shares used to compute   diluted net income per share	389.2		454.8		401.2		477.0
Net income per share attributable to Juniper   Networks common stockholders:
Basic	$	0.52	$	0.23	$	1.11	$	0.93
Diluted	$	0.51	$	0.23	$	1.09	$	0.91
Anti-dilutive:
Potential anti-dilutive shares	3.1		10.2		3.7		10.8