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Fair Value of Financial Instruments - Narrative (Details)
shares in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Dec. 31, 2022
USD ($)
Sep. 01, 2025
tranche
shares
Dec. 31, 2024
USD ($)
Oct. 31, 2021
USD ($)
tranche
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Number of tranches expired | tranche           3    
Root Warrants                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity securities, not readily determinable fair value               $ 126,000,000
Number of tranches | tranche           4   8
Root Warrants for 2.4 million shares                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Number of securities called by warrants (in shares) | shares           2.4    
Root Warrants for 3.2 million shares                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Number of securities called by warrants (in shares) | shares           3.2    
Root Warrants for 1.6 million shares                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Number of securities called by warrants (in shares) | shares           1.6    
Root Warrants for 1.4 million shares                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Number of securities called by warrants (in shares) | shares           1.4    
Root Warrants | Root Warrants                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Deferred revenue $ 41,000,000   $ 41,000,000       $ 57,000,000  
Deferred revenue recognized $ 5,000,000 $ 6,000,000 $ 16,000,000 $ 16,000,000        
Measurement Input, Price Volatility | Root Warrants                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Warrants and rights outstanding, measurement input 1 1 1 1        
Fair Value, Measurements, Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Purchase price adjustment receivable gain (loss) (less than) $ 2,000,000 $ (1,000,000) $ 2,000,000 $ 1,000,000        
Level 3 | Root Warrants | Root Warrants                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Equity securities, fair value               $ 30,000,000
Asset issuances         $ 75,000,000      
Total increase (decrease) in fair value (120,000,000) (26,000,000) 3,000,000 27,000,000        
Variable Interest Entity, Not Primary Beneficiary | Level 3 | Fair Value, Measurements, Recurring                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Proceeds from sale of beneficial interests $ 0 $ 0 $ 0 $ 9,000,000        
Variable Interest Entity, Not Primary Beneficiary | Level 3 | Fair Value, Measurements, Recurring | Measurement Input, Weighted Average Discount Rate | Valuation Technique, Discounted Cash Flow                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Measurement input, discount rate 0.092   0.092       0.097  
Minimum | Variable Interest Entity, Not Primary Beneficiary | Level 3 | Fair Value, Measurements, Recurring | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Measurement input, discount rate 0.055   0.055       0.06  
Maximum | Variable Interest Entity, Not Primary Beneficiary | Level 3 | Fair Value, Measurements, Recurring | Measurement Input, Discount Rate | Valuation Technique, Discounted Cash Flow                
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]                
Measurement input, discount rate 0.10   0.10       0.10