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Related Party Transactions - CEO Program and Other Transactions with CF&Co (Details) - USD ($) shares in Millions |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 25, 2023 | Jul. 10, 2020 | Sep. 27, 2019 | Jul. 24, 2018 | Mar. 31, 2024 | Mar. 31, 2023 | Jun. 11, 2020
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Debt instrument, remaining authorized purchase amount |  |  |  |  | $ 50,000,000 |  |
Maximum |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Purchased senior notes |  |  |  |  |  |  | $ 50,000,000
5.375% Senior Notes due 2023 |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Principal amount of debt component |  |  |  | $ 450,000,000 |  |  |
Stated interest rate |  |  |  | 5.375% |  |  |
3.750% Senior Notes due 10/1/2024 |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Principal amount of debt component |  |  | $ 300,000,000 |  |  |  |
Stated interest rate |  |  | 3.75% |  |  |  |
BGC Partners 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Principal amount of debt component |  | $ 300,000,000 |  |  |  |  |
Stated interest rate |  | 4.375% |  |  |  |  |
BGC Group 8.000% Senior Notes due May 25, 2028 |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Principal amount of debt component | $ 350,000,000 |  |  |  |  |  |
Stated interest rate | 8.00% |  |  |  | 8.00% |  |
Related Party |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Related party expenses |  |  |  |  | $ 0 | $ 0 |
Issuance of common stock (in shares) |  |  |  |  | 0.0 | 0.0 |
Related Party | 5.375% Senior Notes due 2023 |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Advisory fees |  |  |  | $ 200,000 |  |  |
Related Party | 5.375% Senior Notes due 2023 | Underwriting fees |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Related party expenses |  |  |  | $ 300,000 |  |  |
Related Party | 3.750% Senior Notes due 10/1/2024 | Underwriting fees |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Related party expenses |  |  | $ 200,000 |  |  |  |
Related Party | BGC Partners 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Purchased senior notes |  |  |  |  | $ 14,500,000 |  |
Related Party | BGC Partners 4.375% Senior Notes due December 15, 2025 | Underwriting fees |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Related party expenses |  | $ 200,000 |  |  |  |  |
Related Party | BGC Group 8.000% Senior Notes due May 25, 2028 | Underwriting fees |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Related party expenses | $ 200,000 |  |  |  |  |  |

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