Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Total net revenues	$ 1,179.8	$ 1,257.8	$ 3,466.5	$ 3,787.7
Cost of revenues:
Total cost of revenues	468.8	485.4	1,436.2	1,466.8
Gross margin	711.0	772.4	2,030.3	2,320.9
Operating expenses:
Research and development	253.8	236.4	772.0	752.8
Sales and marketing	224.8	232.5	702.5	716.6
General and administrative	67.9	70.6	178.1	176.7
Restructuring charges	4.4	2.0	2.3	29.4
Total operating expenses	550.9	541.5	1,654.9	1,675.5
Operating income	160.1	230.9	375.4	645.4
Other expense, net	(8.1)	(5.1)	(31.1)	(33.8)
Income before income taxes	152.0	225.8	344.3	611.6
Income tax (benefit) provision	(71.8)	60.1	(30.4)	157.3
Net income	$ 223.8	$ 165.7	$ 374.7	$ 454.3
Net income per share:
Basic (in dollars per share)	$ 0.65	$ 0.44	$ 1.07	$ 1.20
Diluted, (in dollars per share)	$ 0.64	$ 0.43	$ 1.05	$ 1.18
Shares used in computing net income per share:
Basic (in shares)	346.2	378.3	350.1	380.0
Diluted (in shares)	350.5	382.7	355.2	386.5
Product
Total net revenues	$ 794.7	$ 869.7	$ 2,330.4	$ 2,615.8
Cost of revenues:
Total cost of revenues	312.5	336.0	955.5	1,026.4
Service
Total net revenues	385.1	388.1	1,136.1	1,171.9
Cost of revenues:
Total cost of revenues	$ 156.3	$ 149.4	$ 480.7	$ 440.4