Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net revenues:
Product	$ 3,446.2	$ 3,528.9	$ 3,563.1
Service	1,581.0	1,461.2	1,294.7
Total net revenues	5,027.2	4,990.1	4,857.8
Cost of revenues:
Product	1,360.9	1,326.2	1,269.6
Service	594.2	559.4	509.6
Total cost of revenues	1,955.1	1,885.6	1,779.2
Gross margin	3,072.1	3,104.5	3,078.6
Operating expenses:
Research and development	980.7	1,013.7	994.5
Sales and marketing	950.2	972.9	943.8
General and administrative	227.5	224.9	228.9
Restructuring charges (benefits)	65.6	3.3	(0.6)
Total operating expenses	2,224.0	2,214.8	2,166.6
Operating income	848.1	889.7	912.0
Other expense, net	(36.3)	(62.3)	(59.8)
Income before income taxes	811.8	827.4	852.2
Income tax provision	505.6	234.7	218.5
Net income	$ 306.2	$ 592.7	$ 633.7
Net income per share:
Basic (in dollars per share)	$ 0.81	$ 1.55	$ 1.62
Diluted (in dollars per share)	$ 0.80	$ 1.53	$ 1.59
Shares used in computing net income per share:
Basic (in shares)	377.7	381.7	390.6
Diluted (in shares)	384.2	387.8	399.4
Cash dividends declared per common stock (in dollars per share)	$ 0.40	$ 0.40	$ 0.40