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Net Income Per Share
 12 Months Ended
Dec. 31, 2021
Earnings Per Share [Abstract]  
NET INCOME PER SHARE NET INCOME PER SHAREBasic net income per share is computed by dividing net income attributable to Fortinet, Inc., by the weighted-average number of shares of common stock outstanding during the period. Diluted net income per share is computed by dividing net income attributable to Fortinet, Inc. by the weighted-average number of shares of common stock outstanding during the period, plus the dilutive effects of restricted stock units (“RSUs”) and stock options. Dilutive shares of common stock are determined by applying the treasury stock method.
A reconciliation of the numerator and denominator used in the calculation of basic and diluted net income per share attributable to Fortinet, Inc. is as follows (in millions, except per share amounts):
 Year Ended December 31,
 202120202019
Numerator:
Net income including non-controlling interests$606.7 $488.5 $331.7 
Net loss attributable to non-controlling interests(0.1)— — 
Net income attributable to Fortinet, Inc.$606.8 $488.5 $331.7 
Denominator:
Basic shares:
Weighted-average common stock outstanding-basic163.2 164.2 171.0 
Diluted shares:
Weighted-average common stock outstanding-basic163.2 164.2 171.0 
Effect of potentially dilutive securities:
RSUs 2.2 2.3 2.8 
Stock options1.7 1.2 1.2 
Weighted-average shares used to compute diluted net income per share attributable to Fortinet, Inc.167.1 167.7 175.0 
Net income per share attributable to Fortinet, Inc.:
Basic$3.72 $2.98 $1.94 
Diluted$3.63 $2.91 $1.90 

The following weighted-average shares of common stock were excluded from the computation of diluted net income per share attributable to Fortinet, Inc. for the periods presented, as their effect would have been antidilutive (in millions):
 Year Ended December 31,
 202120202019
RSUs 0.1 0.3 0.3 
Stock options0.2 0.5 0.6 
Total0.3 0.8 0.9