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Investments - Equity Method Investments and Investments Carried Under Measurement Alternative (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | $ 35,433 | $ 39,075
Investments carried under measurement alternative | 3,530 | 192
Total equity method and investments carried under measurement alternative | $ 38,963 | 39,267
Advanced Markets Holdings |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment ownership percentage amount (as a percent) | 25.00% |
Equity method investments | $ 3,405 | 3,772
China Credit BGC Money Broking Company Limited |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment ownership percentage amount (as a percent) | 33.00% |
Equity method investments | $ 21,734 | 23,242
Freedom International Brokerage |  |
Schedule of Equity Method Investments [Line Items] |  |
Investment ownership percentage amount (as a percent) | 45.00% |
Equity method investments | $ 9,150 | 9,637
Other |  |
Schedule of Equity Method Investments [Line Items] |  |
Equity method investments | $ 1,144 | $ 2,424

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