Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Total net revenues	$ 1,133.1	$ 1,179.8	$ 3,237.3	$ 3,466.5
Cost of revenues:
Total cost of revenues	454.7	468.8	1,339.8	1,436.2
Gross margin	678.4	711.0	1,897.5	2,030.3
Operating expenses:
Research and development	244.5	253.8	716.1	772.0
Sales and marketing	235.3	224.8	692.8	702.5
General and administrative	61.2	67.9	189.4	178.1
Restructuring (benefits) charges	(1.1)	4.4	35.6	2.3
Total operating expenses	539.9	550.9	1,633.9	1,654.9
Operating income	138.5	160.1	263.6	375.4
Other expense, net	(20.4)	(8.1)	(23.2)	(31.1)
Income before income taxes	118.1	152.0	240.4	344.3
Income tax provision (benefit)	18.8	(71.8)	63.8	(30.4)
Net income	$ 99.3	$ 223.8	$ 176.6	$ 374.7
Net income per share:
Basic (in dollars per share)	$ 0.29	$ 0.65	$ 0.51	$ 1.07
Diluted, (in dollars per share)	$ 0.29	$ 0.64	$ 0.50	$ 1.05
Shares used in computing net income per share:
Basic (in shares)	342.2	346.2	345.5	350.1
Diluted (in shares)	345.5	350.5	350.1	355.2
Product
Total net revenues	$ 743.2	$ 794.7	$ 2,075.8	$ 2,330.4
Cost of revenues:
Total cost of revenues	304.0	312.5	888.3	955.5
Service
Total net revenues	389.9	385.1	1,161.5	1,136.1
Cost of revenues:
Total cost of revenues	$ 150.7	$ 156.3	$ 451.5	$ 480.7