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Related Party Transactions - Other Agreements with Cantor (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2023 shares | Jun. 05, 2015 shares | Dec. 31, 2024 USD ($) shares | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Aug. 31, 2013 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |
Repurchase agreements | $ |  |  | $ 0 | $ 0 |  |
Reverse repurchase agreements | $ |  |  | 0 | 0 |  |
Commissions | $ |  |  | $ 1,648,817,000 | 1,464,524,000 | $ 1,281,294,000 |
Limited partnership interest, conversion ratio |  | 1 | 1 |  |  |
Conversion of stock, shares converted (in shares) | shares | 64,000,000 |  |  |  |  |
Minimum number of shares required to be issued (in shares) | shares | 75,000,000 |  |  |  |  |
Class A Common Stock | CFGM |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Investment owned, balance (in shares) | shares |  |  | 0 |  |  |
Class A Common Stock | Cantor |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Investment owned, balance (in shares) | shares |  |  | 0 |  |  |
Class B Common Stock | CFGM |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Investment owned, balance (in shares) | shares |  |  | 3,000,000 |  |  |
Class B Common Stock | Cantor |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Investment owned, balance (in shares) | shares |  |  | 93,300,000 |  |  |
Related Party |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Repurchase agreements | $ |  |  | $ 0 | 0 |  |
Reverse repurchase agreements | $ |  |  | 0 | 0 |  |
Recognition of share of FX gain (loss) | $ |  |  | (4,100,000) | 1,600,000 | (100,000) |
Commissions | $ |  |  | $ 300,000 | $ 300,000 | $ 300,000 |
Investment authorization in asset-backed commercial paper program | $ |  |  |  |  |  | $ 350,000,000.0
Right to exchange from Class A to Class B common stock (up to) (in shares) | shares |  | 34,600,000 |  |  |  |
Related Party | Maximum |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Right to exchange from Class A to Class B common stock (up to) (in shares) | shares |  | 34,600,000 |  |  |  |

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