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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
FPU's
Increase (Decrease) in Stockholders' Equity
Stock issued (in shares)			1,008,731
FPU's | Affiliated Entity | Cantor
Increase (Decrease) in Stockholders' Equity
Stock issued (in shares)	1,008,731
Common Class A
Increase (Decrease) in Stockholders' Equity
Treasury stock repurchases (in shares)	3,613,098	0	4,492,341
Common Stock
Increase (Decrease) in Stockholders' Equity
Dividends declared per share of common stock (dollars per share)	$ 0.01	$ 0.01	$ 0.02	$ 0.11
Dividends declared and paid per share of common stock (dollars per share)	$ 0.01	$ 0.01	$ 0.02	$ 0.11
Common Stock | Common Class A
Increase (Decrease) in Stockholders' Equity
Grant of exchangeability, redemption and issuance of limited partnership interests and issuance of common stock (in shares)	20,235,634	1,109,690	2,827,773,905	1,545,975
Treasury stock repurchases (in shares)	3,613,098		4,492,341

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