Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Net revenues:
Product	$ 3,528.9	$ 3,563.1	$ 3,408.7
Service	1,461.2	1,294.7	1,218.4
Total net revenues	4,990.1	4,857.8	4,627.1
Cost of revenues:
Product	1,326.2	1,269.6	1,286.8
Service	559.4	509.6	482.1
Total cost of revenues	1,885.6	1,779.2	1,768.9
Gross margin	3,104.5	3,078.6	2,858.2
Operating expenses:
Research and development	1,013.7	994.5	1,006.2
Sales and marketing	972.9	943.8	1,023.6
General and administrative	224.9	228.9	231.1
Restructuring and other charges (benefits)	3.3	(0.6)	167.0
Impairment of goodwill	0.0	0.0	850.0
Total operating expenses	2,214.8	2,166.6	3,277.9
Operating income (loss)	889.7	912.0	(419.7)
Other (expense) income, net	(62.3)	(59.8)	333.4
Income (loss) before income taxes	827.4	852.2	(86.3)
Income tax provision	234.7	218.5	248.0
Net income (loss)	$ 592.7	$ 633.7	$ (334.3)
Net income (loss) per share:
Basic (in dollars per share)	$ 1.55	$ 1.62	$ (0.73)
Diluted (in dollars per share)	$ 1.53	$ 1.59	$ (0.73)
Shares used in computing net income (loss) per share:
Basic (in shares)	381.7	390.6	457.4
Diluted (in shares)	387.8	399.4	457.4
Cash dividends declared per share of common stock (in dollars per share)	$ 0.40	$ 0.40	$ 0.20