Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenue:
Product	$ 441.6	$ 397.6	$ 1,208.0	$ 1,395.0
Service	108.5	101.4	319.0	293.9
Total revenue	550.1	499.0	1,527.0	1,688.9
Cost of revenue:
Product	150.3	112.0	397.6	399.2
Service	39.2	30.3	109.0	93.5
Total cost of revenue	189.5	142.3	506.6	492.7
Gross profit	360.6	356.7	1,020.4	1,196.2
Operating expenses:
Selling, general and administrative	154.0	139.3	531.0	426.3
Research and development	47.5	43.2	130.7	126.0
Total operating expenses	201.5	182.5	661.7	552.3
Income from operations	159.1	174.2	358.7	643.9
Interest and other income, net	2.0	3.9	5.5	12.5
Income before taxes	161.1	178.1	364.2	656.4
Income tax expense	37.4	21.3	92.2	151.6
Net income	123.7	156.8	272.0	504.8
Net income per share:
Basic (in dollars per share)	$ 3.43	$ 4.06	$ 7.33	$ 12.75
Diluted (in dollars per share)	$ 3.35	$ 3.99	$ 7.18	$ 12.46
Shares used in computing net income per share:
Basic (in shares)	36.1	38.6	37.1	39.6
Diluted (in shares)	36.9	39.3	37.9	40.5
Total comprehensive income	$ 124.5	$ 159.3	$ 271.3	$ 498.5