Condensed Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
REVENUE:
Total revenue	$ 1,262.3	$ 954.8
COST OF REVENUE:
Total cost of revenue	307.8	253.8
GROSS PROFIT:
Total gross profit	954.5	701.0
OPERATING EXPENSES:
Research and development	151.1	124.9
Sales and marketing	478.3	387.6
General and administrative	52.8	38.6
Gain on intellectual property matter	(1.2)	(1.1)
Total operating expenses	681.0	550.0
OPERATING INCOME	273.5	151.0
INTEREST INCOME	20.6	1.3
INTEREST EXPENSE	(5.0)	(4.5)
OTHER INCOME (EXPENSE)—NET	2.0	(9.1)
INCOME BEFORE INCOME TAXES AND LOSS FROM EQUITY METHOD INVESTMENT	291.1	138.7
PROVISION FOR (BENEFIT FROM) INCOME TAXES	21.3	(8.1)
LOSS FROM EQUITY METHOD INVESTMENT	(22.1)	(8.5)
NET INCOME INCLUDING NON-CONTROLLING INTERESTS	247.7	138.3
LESS: NET LOSS ATTRIBUTABLE TO NON-CONTROLLING INTERESTS, NET OF TAX	0.0	(0.1)
NET INCOME ATTRIBUTABLE TO FORTINET, INC.	$ 247.7	$ 138.4
Net income per share attributable to Fortinet, Inc. (Note 9):
Basic (in dollars per share)	$ 0.32	$ 0.17
Diluted (in dollars per share)	$ 0.31	$ 0.17
Weighted-average shares used to compute net income per share attributable to Fortinet, Inc.:
Basic (in shares)	783.2	803.4
Diluted (in shares)	793.4	820.8
Product
REVENUE:
Total revenue	$ 500.7	$ 371.0
COST OF REVENUE:
Total cost of revenue	193.6	161.0
GROSS PROFIT:
Total gross profit	307.1	210.0
Service
REVENUE:
Total revenue	761.6	583.8
COST OF REVENUE:
Total cost of revenue	114.2	92.8
GROSS PROFIT:
Total gross profit	$ 647.4	$ 491.0