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Condensed Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Equity-based compensation (in shares) 360,422 103,167    
Grant of exchangeability and redemption of limited partnership interests, issuance of shares (in shares) 30,155,970 1,968,788 40,586,915 4,074,189
Repurchase of Class A common stock (in shares)     17,507,000  
Forfeiture of Class A Common Stock (in shares) 84,000 0 84,000 0
Cantor purchase of Cantor units from BGC Holdings upon redemption of FPUs (in shares)     2,768,060  
Dividends declared per share of common stock (in dollars per share) $ 0.01 $ 0.01 $ 0.02 $ 0.15
Dividends declared and paid per share of common stock (in dollars per share) $ 0.01 $ 0.01 $ 0.02 $ 0.15
Partnership Units        
Redemption of FPUs (in shares) 44,496 1,250    
Class A Common Stock        
Equity-based compensation (in shares)     1,727,516 799,674
Grant of exchangeability and redemption of limited partnership interests, issuance of shares (in shares) 30,156,000 1,969,000 40,587,000 4,074,000
Issuance of Class A common stock (net of costs) (in shares) 3,542 176,920 265,915 248,583
Repurchase of Class A common stock (in shares) 16,542,535 0 17,507,006 0
Forfeiture of Class A Common Stock (in shares) 83,765 0 83,765 0
Issuance of Class A common stock and RSUs for acquisitions (in shares) 537,000 15,000 787,000 285,000
Class A Common Stock | Partnership Units        
Redemption of FPUs (in shares)     661,704 1,250
Class A Common Stock | Smith Mack        
Issuance of Class A common stock and RSUs for acquisitions (in shares) 536,893 14,939 787,468 285,435