Related Party Transactions - Other Agreements with Cantor (Details)			12 Months Ended
	Jul. 01, 2023 shares	Jun. 05, 2015 shares	Dec. 31, 2024 USD ($) shares	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Aug. 31, 2013 USD ($)
Related Party Transaction [Line Items]
Repurchase agreements | $			$ 0	$ 0
Reverse repurchase agreements | $			0	0
Commissions | $			$ 1,648,817,000	1,464,524,000	$ 1,281,294,000
Limited partnership interest, conversion ratio		1	1
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
Class A Common Stock | CFGM
Related Party Transaction [Line Items]
Investment owned, balance (in shares) | shares			0
Class A Common Stock | Cantor
Related Party Transaction [Line Items]
Investment owned, balance (in shares) | shares			0
Class B Common Stock | CFGM
Related Party Transaction [Line Items]
Investment owned, balance (in shares) | shares			3,000,000
Class B Common Stock | Cantor
Related Party Transaction [Line Items]
Investment owned, balance (in shares) | shares			93,300,000
Related Party
Related Party Transaction [Line Items]
Repurchase agreements | $			$ 0	0
Reverse repurchase agreements | $			0	0
Recognition of share of FX gain (loss) | $			(4,100,000)	1,600,000	(100,000)
Commissions | $			$ 300,000	$ 300,000	$ 300,000
Investment authorization in asset-backed commercial paper program | $						$ 350,000,000.0
Right to exchange from Class A to Class B common stock (up to) (in shares) | shares		34,600,000
Related Party | Maximum
Related Party Transaction [Line Items]
Right to exchange from Class A to Class B common stock (up to) (in shares) | shares		34,600,000