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Commitments and Contingencies - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Loss Contingencies [Line Items] |  |  |  |  |
Inventory purchase commitments | $ 732,500,000 |  | $ 732,500,000 |  |
Accrued inventory purchase commitments | 35,200,000 |  | 35,200,000 |  | $ 54,000,000
Inventory purchase (benefit) expense | 0 | $ (27,400,000) | 0 | $ 11,200,000 |
Other contractual commitments and open purchase orders | 112,700,000 |  | $ 112,700,000 |  |
Non-cancelable remaining contract term (in excess of) |  |  | 1 year |  |
Operating lease liability | 92,900,000 |  | $ 92,900,000 |  |
Oklahoma Firefighters Pension and Retirement System v. Fortinet, Inc., et al And State Of Rhode Island Office Of The General Treasurer V. Fortinet, Inc. et al |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss accrual | 0 |  | 0 |  |
Alorica v. Fortinet |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |
Loss accrual | $ 0 |  | $ 0 |  | $ 0

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- Definition Amount of loss recognized on firm purchase commitment for inventory. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Accounting Standards Codification -Section 50 -Paragraph 5 -SubTopic 10 -Topic 330 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483080/330-10-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147476148/220-40-50-22 + Details
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- Definition Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3 + Details
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