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Net Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted | 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,
| 2021 |  | 2020 |  | 2019
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-basic | 163.2 |  |  | 164.2 |  |  | 171.0 |
Diluted shares: |  |  |  |  |
Weighted-average common stock outstanding-basic | 163.2 |  |  | 164.2 |  |  | 171.0 |
Effect of potentially dilutive securities: |  |  |  |  |
RSUs | 2.2 |  |  | 2.3 |  |  | 2.8 |
Stock options | 1.7 |  |  | 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 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | 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,
| 2021 |  | 2020 |  | 2019
RSUs | 0.1 |  |  | 0.3 |  |  | 0.3 |
Stock options | 0.2 |  |  | 0.5 |  |  | 0.6 |
Total | 0.3 |  |  | 0.8 |  |  | 0.9 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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