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Commitments, Contingencies and Guarantees - Schedule of Contractual Obligations (Details) - USD ($) | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Nov. 08, 2024 | Aug. 21, 2024 | Oct. 19, 2023 | Oct. 06, 2023 | May 25, 2023 | Jul. 10, 2020 | Sep. 27, 2019
Debt and collateralized borrowings |  |  |  |  |  |  |  |  |  |
Total | $ 1,349,500,000 |  |  |  |  |  |  |  |  |
Less Than 1 Year | 500,000,000 |  |  |  |  |  |  |  |  |
1-3 Years | 0 |  |  |  |  |  |  |  |  |
3-5 Years | 849,500,000 |  |  |  |  |  |  |  |  |
More Than 5 Years | 0 |  |  |  |  |  |  |  |  |
Operating leases |  |  |  |  |  |  |  |  |  |
Total | 172,607,000 |  |  |  |  |  |  |  |  |
Less Than 1 Year | 29,722,000 |  |  |  |  |  |  |  |  |
1-3 Years | 46,821,000 |  |  |  |  |  |  |  |  |
3-5 Years | 28,895,000 |  |  |  |  |  |  |  |  |
More Than 5 Years | 67,169,000 |  |  |  |  |  |  |  |  |
Finance leases |  |  |  |  |  |  |  |  |  |
Total | 3,437,000 |  |  |  |  |  |  |  |  |
Less Than 1 Year | 1,520,000 |  |  |  |  |  |  |  |  |
1-3 Years | 1,917,000 |  |  |  |  |  |  |  |  |
3-5 Years | 0 |  |  |  |  |  |  |  |  |
More Than 5 Years | 0 |  |  |  |  |  |  |  |  |
Interest on debt and collateralized borrowings |  |  |  |  |  |  |  |  |  |
Total | 257,435,000 |  |  |  |  |  |  |  |  |
Less Than 1 Year | 74,750,000 |  |  |  |  |  |  |  |  |
1-3 Years | 123,757,000 |  |  |  |  |  |  |  |  |
3-5 Years | 58,928,000 |  |  |  |  |  |  |  |  |
More Than 5 Years | 0 |  |  |  |  |  |  |  |  |
Interest on Short-term borrowings |  |  |  |  |  |  |  |  |  |
Total | 55,000 |  |  |  |  |  |  |  |  |
Less Than 1 Year | 55,000 |  |  |  |  |  |  |  |  |
1-3 Years | 0 |  |  |  |  |  |  |  |  |
3-5 Years | 0 |  |  |  |  |  |  |  |  |
More Than 5 Years | 0 |  |  |  |  |  |  |  |  |
One-time transition tax |  |  |  |  |  |  |  |  |  |
Total | 11,382,000 |  |  |  |  |  |  |  |  |
Less Than 1 Year | 6,962,000 |  |  |  |  |  |  |  |  |
1-3 Years | 4,420,000 |  |  |  |  |  |  |  |  |
3-5 Years | 0 |  |  |  |  |  |  |  |  |
More Than 5 Years | 0 |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |
Total | 13,242,000 |  |  |  |  |  |  |  |  |
Less Than 1 Year | 13,242,000 |  |  |  |  |  |  |  |  |
1-3 Years | 0 |  |  |  |  |  |  |  |  |
3-5 Years | 0 |  |  |  |  |  |  |  |  |
More Than 5 Years | 0 |  |  |  |  |  |  |  |  |
Total contractual obligations |  |  |  |  |  |  |  |  |  |
Total | 1,807,658,000 |  |  |  |  |  |  |  |  |
Less Than 1 Year | 626,251,000 |  |  |  |  |  |  |  |  |
1-3 Years | 176,915,000 |  |  |  |  |  |  |  |  |
3-5 Years | 937,323,000 |  |  |  |  |  |  |  |  |
More Than 5 Years | 67,169,000 |  |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 8.00% |  |  |
Long-term debt | 1,141,709,000 | $ 944,326,000 |  |  |  |  |  |  |  |
Transition tax on deemed repatriation of foreign subsidiaries earnings net cumulative tax expense net of foreign tax credits | 25,300,000 |  |  |  |  |  |  |  |  |
Transition tax on deemed repatriation of foreign subsidiaries earnings net cumulative tax expense net of foreign tax credits, net adjustment | $ 3,300,000 |  |  |  |  |  |  |  |  |
Transition tax on deemed repatriation of foreign subsidiaries earnings payment period | 8 years |  |  |  |  |  |  |  |  |
Contractual obligation, charitable contribution | $ 13,200,000 |  |  |  |  |  |  |  |  |
Unsecured senior revolving credit agreement | Unsecured Credit Agreement February 26, 2021 |  |  |  |  |  |  |  |  |  |
Total contractual obligations |  |  |  |  |  |  |  |  |  |
Unsecured senior revolving credit agreement | $ 500,000,000.0 |  |  |  |  |  |  |  |  |
BGC Group 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |  |  |  |
Interest on debt and collateralized borrowings |  |  |  |  |  |  |  |  |  |
Total |  |  | $ 0 |  |  |  |  |  |  |
Total contractual obligations |  |  |  |  |  |  |  |  |  |
Stated interest rate | 4.375% |  |  | 4.375% |  | 4.375% | 4.375% |  |  |
Long-term debt | $ 287,462,000 | 286,729,000 |  |  |  |  |  |  |  |
BGC Partners 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |  |  |  |
Interest on debt and collateralized borrowings |  |  |  |  |  |  |  |  |  |
Total | $ 500,000 | 10,500,000 | $ 13,800,000 |  |  |  |  |  |  |
Total contractual obligations |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  |  |  |  |  |  |  |  | $ 300,000,000.0 |
Stated interest rate | 4.375% |  |  |  |  |  |  |  | 4.375% | 4.375%
Long-term debt | $ 11,824,000 | 11,800,000 |  |  |  |  |  |  |  |
BGC Group 8.000% Senior Notes due May 25, 2028 |  |  |  |  |  |  |  |  |  |
Interest on debt and collateralized borrowings |  |  |  |  |  |  |  |  |  |
Total | $ 28,500,000 | 7,100,000 |  |  |  |  |  |  |  |
Total contractual obligations |  |  |  |  |  |  |  |  |  |
Stated interest rate | 8.00% |  |  | 8.00% |  | 8.00% | 8.00% |  |  |
Long-term debt | $ 344,620,000 | 343,852,000 |  |  |  |  |  |  |  |
BGC Partners 8.000% Senior Notes due May 25, 2028 |  |  |  |  |  |  |  |  |  |
Interest on debt and collateralized borrowings |  |  |  |  |  |  |  |  |  |
Total | $ 200,000 | 10,000,000.0 |  |  |  |  |  |  |  |
Total contractual obligations |  |  |  |  |  |  |  |  |  |
Principal amount of debt component |  |  |  |  |  |  |  | $ 350,000,000 |  |
Stated interest rate | 8.00% |  |  |  | 8.00% |  |  | 8.00% |  |
Debt instrument gross amount | $ 2,300,000 |  |  |  |  |  |  |  |  |
Long-term debt | 2,257,000 | $ 2,748,000 |  |  | $ 500,000 |  |  |  |  |
Debt and Collateralized Borrowings | Unsecured senior revolving credit agreement |  |  |  |  |  |  |  |  |  |
Total contractual obligations |  |  |  |  |  |  |  |  |  |
Interest expense | 3,200,000 |  |  |  |  |  |  |  |  |
Debt and Collateralized Borrowings | BGC Group 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |  |  |  |
Total contractual obligations |  |  |  |  |  |  |  |  |  |
Principal amount of debt component | 288,200,000 |  |  |  |  |  |  |  |  |
Debt instrument gross amount | 287,500,000 |  |  |  |  |  |  |  |  |
Interest expense | 11,900,000 |  |  |  |  |  |  |  |  |
Debt and Collateralized Borrowings | BGC Partners 4.375% Senior Notes due December 15, 2025 |  |  |  |  |  |  |  |  |  |
Total contractual obligations |  |  |  |  |  |  |  |  |  |
Principal amount of debt component | $ 11,800,000 |  |  |  |  |  |  |  |  |
Stated interest rate | 4.375% |  |  |  |  |  |  |  |  |
Debt instrument gross amount | $ 11,800,000 |  |  |  |  |  |  |  |  |
Long-term debt | 11,800,000 |  |  |  |  |  |  |  |  |
Interest expense | 500,000 |  |  |  |  |  |  |  |  |
Debt and Collateralized Borrowings | BGC Group 8.000% Senior Notes due May 25, 2028 |  |  |  |  |  |  |  |  |  |
Total contractual obligations |  |  |  |  |  |  |  |  |  |
Principal amount of debt component | $ 347,200,000 |  |  |  |  |  |  |  |  |
Stated interest rate | 8.00% |  |  |  |  |  |  |  |  |
Debt instrument gross amount | $ 344,600,000 |  |  |  |  |  |  |  |  |
Interest expense | 94,500,000 |  |  |  |  |  |  |  |  |
Debt and Collateralized Borrowings | BGC Partners Six Point Zero Percent Senior Notes |  |  |  |  |  |  |  |  |  |
Total contractual obligations |  |  |  |  |  |  |  |  |  |
Principal amount of debt component | $ 500,000,000.0 |  |  |  |  |  |  |  |  |
Stated interest rate | 6.60% |  |  |  |  |  |  |  |  |
Long-term debt | $ 495,500,000 |  |  |  |  |  |  |  |  |
Interest expense | 146,700,000 |  |  |  |  |  |  |  |  |
Debt and Collateralized Borrowings | BGC Partners 8.000% Senior Notes due May 25, 2028 |  |  |  |  |  |  |  |  |  |
Total contractual obligations |  |  |  |  |  |  |  |  |  |
Principal amount of debt component | $ 2,300,000 |  |  |  |  |  |  |  |  |
Stated interest rate | 8.00% |  |  |  |  |  |  |  |  |
Debt instrument gross amount | $ 2,300,000 |  |  |  |  |  |  |  |  |
Long-term debt | 2,300,000 |  |  |  |  |  |  |  |  |
Interest expense | 600,000 |  |  |  |  |  |  |  |  |
One-time Transition Tax |  |  |  |  |  |  |  |  |  |
Total contractual obligations |  |  |  |  |  |  |  |  |  |
Transition tax on deemed repatriation of foreign subsidiaries earnings net cumulative tax expense net of foreign tax credits | $ 28,600,000 |  |  |  |  |  |  |  |  |
Percentage of transition tax to be paid in equal installments over first five years | 40.00% |  |  |  |  |  |  |  |  |
Percentage of remaining transition tax to be paid in installments in years six to eight | 60.00% |  |  |  |  |  |  |  |  |
Percentage of remaining transition tax to be paid in installments in year six | 15.00% |  |  |  |  |  |  |  |  |
Percentage of remaining transition tax to be paid in installments in year seven | 20.00% |  |  |  |  |  |  |  |  |
Percentage of remaining transition tax to be paid in installments in year eight | 25.00% |  |  |  |  |  |  |  |  |
Transition tax on deemed repatriation of foreign subsidiaries earnings net cumulative remaining balance | $ 11,400,000 |  |  |  |  |  |  |  |  |

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