Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Total net revenues	$ 1,204.1	$ 1,308.9	$ 2,286.7	$ 2,529.9
Cost of revenues:
Total cost of revenues	503.2	507.0	967.4	981.4
Gross margin	700.9	801.9	1,319.3	1,548.5
Operating expenses:
Research and development	248.8	240.2	518.2	516.4
Sales and marketing	238.3	239.9	477.7	484.1
General and administrative	54.2	55.6	110.2	106.1
Restructuring (benefits) charges	(0.2)	8.0	(2.1)	27.4
Total operating expenses	541.1	543.7	1,104.0	1,134.0
Operating income	159.8	258.2	215.3	414.5
Other expense, net	(8.9)	(13.0)	(23.0)	(28.7)
Income before income taxes	150.9	245.2	192.3	385.8
Income tax provision	34.4	65.4	41.4	97.2
Net income	$ 116.5	$ 179.8	$ 150.9	$ 288.6
Net income per share:
Basic (in dollars per share)	$ 0.33	$ 0.47	$ 0.43	$ 0.76
Diluted, (in dollars per share)	$ 0.33	$ 0.47	$ 0.42	$ 0.74
Shares used in computing net income per share:
Basic (in shares)	349.0	380.4	352.2	380.6
Diluted (in shares)	351.3	385.6	356.8	387.6
Cash dividends declared per common stock (in dollars per share)	$ 0.18	$ 0.10	$ 0.36	$ 0.2
Product
Total net revenues	$ 824.9	$ 917.2	$ 1,535.7	$ 1,746.1
Cost of revenues:
Total cost of revenues	336.6	360.2	643.0	690.4
Service
Total net revenues	379.2	391.7	751.0	783.8
Cost of revenues:
Total cost of revenues	$ 166.6	$ 146.8	$ 324.4	$ 291.0