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v3.24.3

Subsequent Events (Detail) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 28, 2024 | Oct. 01, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Oct. 30, 2024 | Jun. 07, 2024 | Mar. 08, 2024 | Oct. 06, 2023 | Sep. 27, 2019 | Aug. 06, 2018 | Mar. 19, 2018
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share of common stock (in dollars per share) |  |  | $ 0.02 | $ 0.01 | $ 0.05 | $ 0.03 |  |  |  |  |  |  |
Revolving credit facility | BGC Credit Agreement | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  |  |  |  |  |  |  | $ 400.0 | $ 400.0 |  |  | $ 400.0 | $ 250.0
BGC Group 3.750% Senior Notes due October 1, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.75% |  | 3.75% |  |  |  |  | 3.75% |  |  |
BGC Partners 3.750% Senior Notes due October 1, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.75% |  | 3.75% |  |  |  |  |  | 3.75% |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends declared per share of common stock (in dollars per share) | $ 0.02 |  |  |  |  |  |  |  |  |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  | $ 400.0 |  |  |  |  |  |
Subsequent event | Senior Revolving Credit Agreement |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from credit facility |  | $ 200.0 |  |  |  |  |  |  |  |  |  |  |
Subsequent event | Revolving credit facility | BGC Credit Agreement | Related Party |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of outstanding borrowings |  | 150.0 |  |  |  |  |  |  |  |  |  |  |
Subsequent event | BGC Group 3.750% Senior Notes due October 1, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  | $ 255.5 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.75% |  |  |  |  |  |  |  |  |  |  |
Subsequent event | BGC Partners 3.750% Senior Notes due October 1, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  | $ 44.5 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 3.75% |  |  |  |  |  |  |  |  |  |  |

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