Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Total net revenues	$ 1,086.3	$ 1,102.5	$ 2,084.3	$ 2,104.2
Cost of revenues:
Total cost of revenues	466.7	465.7	885.4	885.1
Gross margin	619.6	636.8	1,198.9	1,219.1
Operating expenses:
Research and development	241.0	244.0	473.5	471.6
Sales and marketing	224.2	229.0	463.4	457.5
General and administrative	59.1	60.0	118.4	128.2
Restructuring charges	4.8	21.4	13.7	36.7
Total operating expenses	529.1	554.4	1,069.0	1,094.0
Operating income	90.5	82.4	129.9	125.1
Other expense, net	(4.4)	(4.6)	(15.5)	(2.8)
Income before income taxes	86.1	77.8	114.4	122.3
Income tax provision	24.9	31.6	32.8	45.0
Net income	$ 61.2	$ 46.2	$ 81.6	$ 77.3
Net income per share:
Basic (in dollars per share)	$ 0.18	$ 0.13	$ 0.25	$ 0.22
Diluted, (in dollars per share)	$ 0.18	$ 0.13	$ 0.24	$ 0.22
Weighted-average shares used to compute net income per share:
Basic (in shares)	331.0	346.3	330.9	347.2
Diluted (in shares)	333.1	349.1	334.7	351.7
Product
Total net revenues	$ 692.3	$ 713.9	$ 1,301.1	$ 1,332.6
Cost of revenues:
Total cost of revenues	321.7	314.3	590.7	584.3
Service
Total net revenues	394.0	388.6	783.2	771.6
Cost of revenues:
Total cost of revenues	$ 145.0	$ 151.4	$ 294.7	$ 300.8