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Summary of Significant Accounting Policies - Additional Information (Details)
 12 Months Ended
Nov. 03, 2022
USD ($)
Apr. 22, 2021
USD ($)
Apr. 03, 2020
USD ($)
Dec. 31, 2022
USD ($)
segment
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 01, 2022
USD ($)
Significant Accounting Policies              
Number of operating segments | segment       1      
Accounts receivable       $ 278,900,000 $ 196,200,000 $ 104,700,000  
Allowance for credit loss       11,600,000 9,300,000 15,200,000  
Provisions for expected credit losses       1,900,000 4,500,000 11,700,000  
Accounts receivable, writeoff       400,000 1,400,000 2,700,000  
Revenue       4,095,135,000 3,208,323,000 2,364,681,000  
Sales and marketing       531,512,000 411,406,000 416,331,000  
Advertising expenses       162,100,000 145,400,000 102,500,000  
Impairment loss $ 55,300,000            
Prepaid expenses and other current assets       786,067,000 522,212,000    
Goodwill impairment       0 0 0  
Impairment of long-lived assets       0 0 0  
Capitalized software development costs       12,100,000 16,200,000 12,800,000  
Transfer of certain legacy auto insurance liabilities     $ 407,900,000        
Net carrying amount of liability component       839,494,000 711,437,000    
Additional paid-in capital       10,335,013,000 9,706,293,000    
Accumulated deficit       (9,940,595,000) (8,362,572,000)    
DARAG Bermuda LTD              
Significant Accounting Policies              
Reserves for current period   $ 183,200,000          
Pacific Valley Insurance Company, Inc. | DARAG Bermuda LTD              
Significant Accounting Policies              
Transfer of certain legacy auto insurance liabilities   251,300,000          
Reinsurance obligations   434,500,000          
Unearned premiums   $ 271,500,000          
Sales and marketing              
Significant Accounting Policies              
Credit and refund payments       21,500,000 19,100,000 18,800,000  
Cost of revenue              
Significant Accounting Policies              
Credit and refund payments       7,800,000 6,500,000 0  
Cumulative Effect, Period of Adoption, Adjustment              
Significant Accounting Policies              
Additional paid-in capital             $ (140,000,000)
Accumulated deficit             6,500,000
Convertible Senior Notes Due 2025              
Significant Accounting Policies              
Net carrying amount of liability component       $ 740,609,000 604,317,000    
Convertible Senior Notes Due 2025 | Cumulative Effect, Period of Adoption, Adjustment              
Significant Accounting Policies              
Net carrying amount of liability component             133,500,000
Scooter              
Significant Accounting Policies              
Estimated useful life of property and equipment       12 months      
Depreciation expense       $ 8,600,000 5,900,000 7,200,000  
Scooter | Not Yet Placed Into Service              
Significant Accounting Policies              
Prepaid expenses and other current assets       0 0    
Scooter | Placed Into Service              
Significant Accounting Policies              
Prepaid expenses and other current assets       $ 7,500,000 15,300,000    
Adjustments              
Significant Accounting Policies              
Additional paid-in capital             (140,000,000)
Accumulated deficit             $ 6,500,000
Minimum              
Significant Accounting Policies              
Estimated useful lives of intangible assets       2 years      
Minimum | Property, Plant and Equipment              
Significant Accounting Policies              
Estimated useful life of property and equipment       2 years      
Maximum              
Significant Accounting Policies              
Estimated useful lives of intangible assets       12 years      
Maximum | Property, Plant and Equipment              
Significant Accounting Policies              
Estimated useful life of property and equipment       7 years      
Driver Passenger and Light Vehicle Renter Incentive Programs | Adjustments              
Significant Accounting Policies              
Revenue       $ (1,400,000,000) (1,300,000,000) (390,800,000)  
Sales and marketing       $ (109,800,000) $ (64,700,000) $ (135,000,000)