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Related Party Transactions - Service Agreements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Tower Bridge International Services LP | BGC Partners, Inc. |  |  |
Related Party Transaction [Line Items] |  |  |
Company ownership of Tower Bridge | 52.00% |  |
Tower Bridge International Services LP | Cantor |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership percentage by noncontrolling owners | 48.00% |  |
Cantor |  |  |
Related Party Transaction [Line Items] |  |  |
Mark-up cost of services | 7.50% |  |
Less: Net income (loss) from continuing operations attributable to noncontrolling interest in subsidiaries | $ 0.7 | $ 2.5 | $ 0.8
Recognized related party revenues | 14.7 | 14.9 | 25.8
Service charges | 84.9 | 81.9 | 62.6
Compensation to leased employees | $ 59.2 | $ 57.9 | $ 39.4

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