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v3.25.3

Related Party Transactions - CEO Program and Other Transactions with CF&Co (Details) - USD ($) $ in Thousands, shares in Millions |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 02, 2025 | Jun. 10, 2024 | May 25, 2023 | Jul. 10, 2020 | Sep. 27, 2019 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Aug. 21, 2024 | Jul. 01, 2023 | Jun. 11, 2020
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 1,837,085 |  | $ 1,837,085 |  | $ 1,141,709 |  |  |
Debt instrument, remaining authorized purchase amount |  |  |  |  |  | 49,500 |  | 49,500 |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased senior notes |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 | $ 50,000
3.750% Senior Notes due 10/1/2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 3.75% |  |  |  |  |  |  |  |
BGC Partners 8.000% Senior Notes due May 25, 2028 |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 8.00% |  |  |  |  |  |  |  | 8.00% |  |
Debt instrument, repurchased face amount |  |  |  |  |  |  |  |  |  |  | $ 500 |  |
Long-term debt |  |  |  |  |  | $ 2,261 |  | $ 2,261 |  | 2,257 | $ 500 |  |
BGC Partners 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  |  |  | $ 300,000 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 8.00% |  | 8.00% |  |  |  |  |
BGC Group 6.600% Senior Notes due June 10, 2029 |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 6.60% |  |  |  | 6.60% |  | 6.60% |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 496,297 |  | $ 496,297 |  | 495,546 |  |  |
Underwriting fees paid |  | $ 400 |  |  |  |  |  |  |  |  |  |  |
BGC Group 6.150% Senior Notes due April 2, 2030 |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 6.15% |  | 6.15% |  |  |  |  |
Long-term debt |  |  |  |  |  | $ 693,478 |  | $ 693,478 |  | $ 0 |  |  |
Related Party |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  |  | 0.0 | 0.0 | 0.0 | 0.0 |  |  |  |
Related party expenses |  |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |
Related Party | 3.750% Senior Notes due 10/1/2024 | Underwriting fees |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  | $ 200 |  |  |  |  |  |  |  |
Related Party | BGC Partners 4.375% Senior Notes due December 15, 2025 | Underwriting fees |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  |  | $ 200 |  |  |  |  |  |  |  |  |
Purchased senior notes |  |  |  |  |  | $ 14,500 |  | $ 14,500 |  |  |  |  |
Related Party | BGC Group 8.000% Senior Notes due May 25, 2028 | Underwriting fees |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  | $ 200 |  |  |  |  |  |  |  |  |  |
Related Party | BGC Group 6.150% Senior Notes due April 2, 2030 | Underwriting fees |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses | $ 400 |  |  |  |  |  |  |  |  |  |  |  |
Principal amount of debt component | $ 700,000 |  |  |  |  |  |  |  |  |  |  |  |

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