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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