Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Net revenues:
Net revenues	$ 4,445.4	$ 4,647.5	$ 5,027.2
Cost of revenues:
Cost of revenues	1,828.6	1,906.3	1,955.1
Gross margin	2,616.8	2,741.2	3,072.1
Operating expenses:
Research and development	955.7	1,003.2	980.7
Sales and marketing	939.3	927.4	950.2
General and administrative	244.3	231.1	227.5
Restructuring charges	35.3	7.3	65.6
Total operating expenses	2,174.6	2,169.0	2,224.0
Operating income	442.2	572.2	848.1
Other expense, net	(27.8)	(39.5)	(36.3)
Income before income taxes	414.4	532.7	811.8
Income tax provision (benefit)	69.4	(34.2)	505.6
Net income	$ 345.0	$ 566.9	$ 306.2
Net income per share:
Basic (in dollars per share)	$ 1.01	$ 1.62	$ 0.81
Diluted (in dollars per share)	$ 0.99	$ 1.60	$ 0.80
Shares used in computing net income per share:
Basic (in shares)	343.2	349.0	377.7
Diluted (in shares)	348.2	354.4	384.2
Product
Net revenues:
Net revenues	$ 2,867.7	$ 3,107.1	$ 3,446.2
Cost of revenues:
Cost of revenues	1,227.0	1,277.2	1,360.9
Service
Net revenues:
Net revenues	1,577.7	1,540.4	1,581.0
Cost of revenues:
Cost of revenues	$ 601.6	$ 629.1	$ 594.2