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Organization and Basis of Presentation (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 01, 2023 | Jun. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Total number of shares (in shares) |  | 0 |  |  |  |  |
Conversion of stock, shares converted (in shares) | 64,000,000 |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  | 55,348 |  |  |
Minimum number of shares required to be issued (in shares) | 75,000,000.0 |  |  |  |  |  |
Stock Purchased On 6/30/2023 |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Conversion of stock, shares converted (in shares) | 5,700,000 |  |  |  |  |  |
Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 0 | 0 | 0 | 0 |
Non-exchangeable Limited Partnership Interests |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Share-based payment arrangement, expense |  | $ 60,900,000 |  |  |  |  |
Exchangeable Limited Partnership Units | Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  | 1,500,000 |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Shares granted in period (in shares) | 25,300,000 |  |  |  |  |  |
Corporate conversion, exchange ratio (in shares) |  | 1 |  |  |  |  |
Share-based payment arrangement, decrease for tax withholding obligation | $ 74,000,000 | $ 49,200,000 |  |  |  |  |
Restricted Stock Units (RSUs) | Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Shares granted in period (in shares) |  | 16,900,000 |  |  |  |  |
Non-exchangeable FPUs | Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  | 5,600,000 |  |  |  |  |
Cantor Units | Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  | 324,223 |  |  |  |  |
Cantor Units | Related Party | Cantor |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  | 5,425,209 |  |  |  |  |
Shares redeemed in period, value |  | $ 9,715,772 |  |  |  |  |
FPU | Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Shares redeemed in period (in shares) |  | 5,425,209 |  |  |  |  |
Shares exchanged in period (in shares) |  | 324,223 |  |  |  |  |
FPU & Cantor Units | Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Shares redeemed in period, value |  | $ 598,712 |  |  |  |  |
Restricted Shares |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Share-based payment arrangement, expense |  |  | $ 9,200,000 |  | $ 53,500,000 |  |
Restricted Shares | Maximum |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Shares granted in period (in shares) | 38,600,000 |  |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01
Shares granted in period (in shares) | 600,000,000 |  |  |  |  |  |
Corporate conversion, exchange ratio (in shares) | 1 |  |  |  |  |  |
Share-based payment arrangement, decrease for tax withholding obligation |  |  | $ 3,700,000 |  | $ 24,900,000 |  |
Issuance of common stock (in shares) |  |  | 100,219 |  | 269,113 | 234,931 |
Common stock, shares authorized (in shares) | 1,500,000,000 |  | 1,500,000,000 |  | 1,500,000,000 |  | 1,500,000,000
Class A Common Stock | Share-Based Payment Arrangement | Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Shares granted in period (in shares) |  | 1,000,000 |  |  |  |  |
Class A Common Stock | BGC Partners |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  |
Class A Common Stock | BGC Group |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  |
Class B Common Stock |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) |  |  | $ 0.01 |  | $ 0.01 |  | $ 0.01
Corporate conversion, exchange ratio (in shares) | 1 |  |  |  |  |  |
Issuance of common stock (in shares) |  |  | 0 | 64,000,000 | 0 | 64,000,000 |
Common stock, shares authorized (in shares) | 300,000,000 |  | 300,000,000 |  | 300,000,000 |  | 300,000,000
Class B Common Stock | BGC Partners |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  |
Class B Common Stock | BGC Group |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  |

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