Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income including non-controlling interests	$ 247.7	$ 138.3
Other comprehensive income (loss):
Change in foreign currency translation	(0.8)	(4.5)
Change in unrealized losses on investments	3.8	(9.3)
Less: tax provision (benefit) related to items of other comprehensive income or loss	0.9	(2.1)
Other comprehensive income (loss)	2.1	(11.7)
Comprehensive income including non-controlling interests	249.8	126.6
Less: comprehensive loss attributable to non-controlling interests	0.0	(1.2)
Comprehensive income attributable to Fortinet, Inc.	$ 249.8	$ 127.8