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Condensed Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Statement of Comprehensive Income [Abstract]      
Net income including non-controlling interests $ 606.7 $ 488.5 $ 331.7
Other comprehensive income (loss):      
Change in foreign currency translation (3.8) 0.0 0.0
Change in unrealized gains (losses) on investments (3.5) (0.2) 2.5
Less: tax provision (benefit) related to items of other comprehensive income or loss (0.8) 0.2 0.5
Other comprehensive income (loss) (6.5) (0.4) 2.0
Comprehensive income including non-controlling interests 600.2 488.1 333.7
Less: comprehensive loss attributable to non-controlling interests (1.1) 0.0 0.0
Comprehensive income attributable to Fortinet, Inc. $ 601.3 $ 488.1 $ 333.7