Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net revenues:
Product	$ 862.1	$ 899.7	$ 1,615.1	$ 1,663.8
Service	359.2	322.5	704.1	625.8
Total net revenues	1,221.3	1,222.2	2,319.2	2,289.6
Cost of revenues:
Product	328.3	311.7	606.2	600.5
Service	136.6	129.0	265.7	250.3
Total cost of revenues	464.9	440.7	871.9	850.8
Gross margin	756.4	781.5	1,447.3	1,438.8
Operating expenses:
Research and development	247.9	251.6	498.9	500.3
Sales and marketing	243.7	232.4	475.5	452.6
General and administrative	58.6	56.3	118.0	111.5
Restructuring charges (benefits)	2.4	(1.9)	2.4	(0.5)
Total operating expenses	552.6	538.4	1,094.8	1,063.9
Operating income	203.8	243.1	352.5	374.9
Other expense, net	(11.6)	(17.1)	(33.8)	(32.9)
Income before income taxes	192.2	226.0	318.7	342.0
Income tax provision	52.2	68.0	87.3	103.8
Net income	$ 140.0	$ 158.0	$ 231.4	$ 238.2
Net income per share:
Basic, in dollars per share	$ 0.37	$ 0.41	$ 0.60	$ 0.60
Diluted, in dollars per share	$ 0.36	$ 0.40	$ 0.60	$ 0.59
Shares used in computing net income per share:
Basic (in shares)	382.8	389.9	383.0	398.4
Diluted (in shares)	386.3	397.2	388.6	406.1
Cash dividends declared per common stock (in dollars per share)	$ 0.1	$ 0.1	$ 0.2	$ 0.2