Consolidated Statements Of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue:
Product	$ 2,187.4	$ 1,919.6	$ 1,702.7
Service	517.0	464.8	429.0
Total revenue	2,704.4	2,384.4	2,131.7
Cost of revenue:
Product	663.3	647.2	569.9
Service	151.0	159.3	148.0
Total cost of revenue	814.3	806.5	717.9
Gross profit	1,890.1	1,577.9	1,413.8
Operating expenses:
Selling, general and administrative	705.3	640.5	691.0
Research and development	239.6	197.4	178.0
Total operating expenses	944.9	837.9	869.0
Income from operations	945.2	740.0	544.8
Interest and other income, net	35.6	18.5	4.2
Income before taxes	980.8	758.5	549.0
Income tax expense	244.9	169.7	130.2
Net income	$ 735.9	$ 588.8	$ 418.8
Net income per share:
Basic (usd per share)	$ 19.21	$ 15.87	$ 11.35
Diluted (usd per share)	$ 18.73	$ 15.54	$ 11.11
Shares used in computing net income per share:
Basic (shares)	38.3	37.1	36.9
Diluted (shares)	39.3	37.9	37.7