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Net Income Per Share , Calculation of Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Line Items]      
Net income including non-controlling interests $ 606.7 $ 488.5 $ 331.7
Net loss attributable to non-controlling interests (0.1) 0.0 0.0
NET INCOME ATTRIBUTABLE TO FORTINET, INC. $ 606.8 $ 488.5 $ 331.7
Basic shares:      
Weighted-average common shares outstanding-basic (in shares) 163.2 164.2 171.0
Diluted shares:      
Weighted-average common shares outstanding-basic (in shares) 163.2 164.2 171.0
Effect of potentially dilutive securities:      
Weighted-average shares used to compute diluted net income per share (in shares) 167.1 167.7 175.0
Net income per share attributable to Fortinet, Inc. common stockholders:      
Basic (in dollars per share) $ 3.72 $ 2.98 $ 1.94
Diluted (in dollars per share) $ 3.63 $ 2.91 $ 1.90
RSUs      
Effect of potentially dilutive securities:      
RSUs and stock options (in shares) 2.2 2.3 2.8
Stock options      
Effect of potentially dilutive securities:      
RSUs and stock options (in shares) 1.7 1.2 1.2