Investments (Details)	1 Months Ended	12 Months Ended
	Dec. 31, 2022 USD ($)	Dec. 31, 2022 USD ($) d	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jul. 20, 2022 USD ($)	Sep. 08, 2017 USD ($)
Schedule of Equity Method Investments
(Loss) income from equity method investments		$ 2,842,000	$ 0	$ (11,562,000)
Distributions received		0	0	100,000
Unrealized gain (loss) on marketable securities		(14,100,000)	1,600,000	$ (84,200,000)
Cantor | Corporate Joint Venture
Schedule of Equity Method Investments
Due from related party, current					$ 88,400,000
Other Assets
Schedule of Equity Method Investments
Equity method investment	$ 91,300,000	91,300,000	88,300,000
Equity securities without readily determinable fair value, amount	2,800,000	2,800,000	8,500,000
Debt securities	$ 8,700,000	$ 8,700,000	$ 20,000,000
CF Real Estate Finance Holdings, L.P.
Schedule of Equity Method Investments
Equity method investment ownership percentage	27.00%	27.00%
Equity method investment						$ 100,000,000
Rescission of ownership percentage by parent	27.20%	27.20%
Redemption notice, threshold trading days | d		20
Payment for administrative fees	$ 44,000