Related Party Transactions - Other Agreements with Cantor (Details) - USD ($)		3 Months Ended
	Jul. 01, 2023	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Aug. 31, 2013
Related Party Transaction [Line Items]
Repurchase agreements		$ 0		$ 0
Reverse repurchase agreements		0		0
Commissions		494,711,000	$ 415,172,000
Investment in asset-backed commercial paper program		$ 0		0
Conversion of stock, shares converted (in shares)	64,000,000
Minimum number of shares required to be issued (in shares)	75,000,000.0
Class A Common Stock | Cantor
Related Party Transaction [Line Items]
Investment owned, balance (in shares)		0
Class A Common Stock | CFGM
Related Party Transaction [Line Items]
Investment owned, balance (in shares)		0
Class B Common Stock | Cantor
Related Party Transaction [Line Items]
Investment owned, balance (in shares)		93,300,000
Class B Common Stock | CFGM
Related Party Transaction [Line Items]
Investment owned, balance (in shares)		3,000,000.0
Related Party
Related Party Transaction [Line Items]
Repurchase agreements		$ 0		0
Reverse repurchase agreements		0		$ 0
Recognition of share of FX gains (losses)		7,500,000	(100,000)
Commissions		$ 100,000	$ 100,000
Investment authorization in asset-backed commercial paper program					$ 350,000,000.0