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Related Party Transactions - Other Agreements with Cantor (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jul. 01, 2023
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Aug. 31, 2013
Related Party Transaction [Line Items]              
Repurchase agreements   $ 0   $ 0   $ 0  
Reverse repurchase agreements   0   0   0  
Commissions   599,496,000 $ 395,081,000 1,094,207,000 $ 810,253,000    
Investment in asset-backed commercial paper program   $ 0   $ 0   0  
Conversion of stock, shares converted (in shares) 64,000,000            
Minimum number of shares required to be issued (in shares) 75,000,000            
Class A Common Stock | Cantor              
Related Party Transaction [Line Items]              
Investment owned, balance (in shares)   0   0      
Class A Common Stock | CFGM              
Related Party Transaction [Line Items]              
Investment owned, balance (in shares)   0   0      
Class B Common Stock | Cantor              
Related Party Transaction [Line Items]              
Investment owned, balance (in shares)   93,300,000   93,300,000      
Class B Common Stock | CFGM              
Related Party Transaction [Line Items]              
Investment owned, balance (in shares)   3,000,000.0   3,000,000.0      
Related Party              
Related Party Transaction [Line Items]              
Repurchase agreements   $ 0   $ 0   0  
Reverse repurchase agreements   0   0   $ 0  
Recognition of share of FX gains (losses)   (2,800,000) (1,400,000) (2,900,000) (1,400,000)    
Commissions   $ 100,000 $ 100,000 $ 200,000 $ 200,000    
Investment authorization in asset-backed commercial paper program             $ 350,000,000.0