Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenue:
Product	$ 405.6	$ 480.4	$ 766.4	$ 997.4
Service	106.6	98.1	210.5	192.5
Total revenue	512.2	578.5	976.9	1,189.9
Cost of revenue:
Product	133.5	140.9	247.3	287.2
Service	34.3	32.4	69.8	63.2
Total cost of revenue	167.8	173.3	317.1	350.4
Gross profit	344.4	405.2	659.8	839.5
Operating expenses:
Selling, general and administrative	161.2	145.5	377.0	287.0
Research and development	40.2	41.2	83.2	82.8
Total operating expenses	201.4	186.7	460.2	369.8
Income from operations	143.0	218.5	199.6	469.7
Interest and other income (expense), net	(0.4)	4.3	3.5	8.6
Income before taxes	142.6	222.8	203.1	478.3
Income tax expense	38.6	63.7	54.8	130.3
Net income	104.0	159.1	148.3	348.0
Net income per share:
Basic (in dollars per share)	$ 2.82	$ 3.99	$ 3.94	$ 8.68
Diluted (in dollars per share)	$ 2.77	$ 3.90	$ 3.87	$ 8.47
Shares used in computing net income per share:
Basic (in shares)	36.9	39.9	37.6	40.1
Diluted (in shares)	37.6	40.8	38.3	41.1
Total comprehensive income	$ 100.8	$ 148.9	$ 146.8	$ 339.3