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Consolidated Statements of Changes in Equity (Parenthetical) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Equity-based compensation (in shares) | 2,167,170 | 1,133,725 | 434,694
Grant of exchangeability and redemption of limited partnership interests (in shares) | 58,024,858 | 13,190,311 | 15,008,431
Repurchase of Class A common stock (in shares) | 68,253,000 |  |
Cantor purchase of Cantor units from BGC Holdings upon redemption of FPUs (in shares) | 4,408,931 |  |
Dividends declared per share of common stock (in dollars per share) | $ 0.04 | $ 0.17 | $ 0.56
Dividends declared and paid per share of common stock (in dollars per share) | $ 0.04 | $ 0.17 | $ 0.56
Smith Mack |  |  |
Issuance of Class A common stock and RSUs for acquisitions (in shares) | 1,789,018 | 390,775 | 1,039,452
Partnership Units |  |  |
Redemption of FPUs (in shares) | 1,198,131 | 730,141 | 56,878
Class A Common Stock |  |  |
Grant of exchangeability and redemption of limited partnership interests (in shares) | 58,025,000 | 13,190,000 |
Issuance of Class A common stock (net of costs) (in shares) | 417,247 | 390,570 | 212,711
Repurchase of Class A common stock (in shares) | 68,253,498 | 2,259 | 233,172
Forfeiture of Class A common stock (in shares) | 140,188 |  | 22,046
Issuance of Class A common stock and RSUs for acquisitions (in shares) | 1,789,000 | 391,000 |

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