Related Party Transactions - Other Agreements with Cantor (Details)				12 Months Ended
	Jul. 01, 2023 shares	Aug. 06, 2018 USD ($)	Jun. 05, 2015 shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Aug. 05, 2018 USD ($)	Mar. 19, 2018 USD ($)	Aug. 31, 2013 USD ($)
Related Party Transaction [Line Items]
Reverse repurchase agreements				$ 0	$ 0
Commissions				1,464,524,000	1,281,294,000	$ 1,541,900,000
Conversion of stock, shares converted (in shares) | shares	64,000,000
Minimum number of shares required to be issued (in shares) | shares	75,000,000
Interest expense				$ 77,231,000	57,932,000	69,329,000
Limited partnership interest, conversion ratio				1
Class B Common Stock | Cantor
Related Party Transaction [Line Items]
Investment owned, balance (in shares) | shares				93,300,000
Class B Common Stock | CFGM
Related Party Transaction [Line Items]
Investment owned, balance (in shares) | shares				3,000,000
Class A Common Stock | Cantor
Related Party Transaction [Line Items]
Investment owned, balance (in shares) | shares				0
Class A Common Stock | CFGM
Related Party Transaction [Line Items]
Investment owned, balance (in shares) | shares				0
Related Party
Related Party Transaction [Line Items]
Repurchase agreements				$ 0	0
Reverse repurchase agreements				0	0
Recognition of share of FX gains				1,600,000	(100,000)	500,000
Commissions				300,000	300,000	100,000
Investment authorization in asset-backed commercial paper program									$ 350,000,000
Number of shares, right to exchange from Class A to Class B common stock (in shares) | shares			34,600,000
Related Party | Revolving Credit Facility
Related Party Transaction [Line Items]
Principal amount of notes		$ 400,000,000					$ 250,000,000	$ 250,000,000
Debt instrument, extended term		1 year
Debt instrument, non-extension notice term		6 months
Debt instrument, basis point		1.00%
Line of credit facility, current borrowing capacity				0	0
Interest expense				$ 0	$ 0	$ 0
Related Party | Maximum
Related Party Transaction [Line Items]
Number of shares, right to exchange from Class A to Class B common stock (in shares) | shares			34,600,000