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Stock Transactions and Unit Redemptions - Changes in Shares of Class A Common Stock Outstanding (Details) - shares | 1 Months Ended | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Aug. 31, 2025 | Jul. 31, 2025 | Sep. 30, 2024 | Aug. 31, 2024 | Jul. 31, 2024 | Sep. 30, 2025 | Jun. 30, 2025 | Mar. 31, 2025 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Share issuances: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock repurchases (in shares) | (2,225,000) | (2,014,000) | 0 | (1,046,000) | (4,807,000) | (2,040,000) | (4,239,000) | (17,224,000) | (3,184,000) | (7,893,000) | (10,688,000) | (11,250,000) | (24,647,000) | (29,831,000)
Limited Partnership |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share issuances: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of units redeemed and cancelled for exchange (in shares) |  |  |  |  |  |  | 200,000 |  |  | 200,000 |  |  | 900,000 | 1,400,000
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares outstanding at beginning of period (in shares) |  |  | 366,193,000 |  |  | 379,588,000 | 366,193,000 |  | 374,297,000 | 379,588,000 |  | 390,095,000 | 374,297,000 | 390,095,000
Share issuances: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Redemptions/exchanges of limited partnership interests and contingent share obligations (in shares) |  |  |  |  |  |  | 175,000 |  |  | 180,000 |  |  | 793,000 | 1,298,000
Vesting of RSUs (in shares) |  |  |  |  |  |  | 1,189,000 |  |  | 2,507,000 |  |  | 8,267,000 | 8,192,000
Acquisitions (in shares) |  |  |  |  |  |  | 52,679 |  |  | 70,371 |  |  | 694,332 | 542,626
Other issuances of BGC Class A common stock (in shares) |  |  |  |  |  |  | 2,566,000 |  |  | 1,278,000 |  |  | 6,906,000 | 6,106,000
Restricted stock forfeitures (in shares) |  |  |  |  |  |  | 0 |  |  | (299,935) |  |  | (372,504) | (972,567)
Treasury stock repurchases (in shares) |  |  |  |  |  |  | (4,236,069) |  |  | (7,013,116) |  |  | (22,808,205) | (26,264,523)
Shares outstanding at end of period (in shares) | 365,937,000 |  |  | 375,430,000 |  |  | 365,937,000 | 366,193,000 |  | 375,430,000 | 379,588,000 |  | 365,937,000 | 375,430,000
Conversion, shares issued (in shares) |  |  |  |  |  |  | 200,000 |  |  | 200,000 |  |  | 800,000 | 1,300,000

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