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Dividend Income, Amount Per Share, Net Of Tax

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Amount of commission revenue from buying and selling securities on behalf of customers.

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Amount, before tax, of realized gain (loss) from foreign currency transaction.

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Number of shares of investment owned.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The carrying value of securities purchased to be resold in reverse repurchase transactions as of the balance sheet date.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Related Party Transactions - Other Agreements with Cantor (Details) - USD ($)		3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025	Oct. 06, 2025	May 16, 2025
Related Party Transaction [Line Items]
Repurchase agreements		$ 0		$ 0		$ 0
Reverse repurchase agreements		0		0		0
Commissions		$ 649,171,000	$ 599,496,000	$ 1,402,106,000	$ 1,094,207,000
Conversion of stock, shares converted (in shares)	64,000,000.0
Minimum number of shares required to be issued (in shares)	75,000,000
Mr. Howard W. Lutnick
Related Party Transaction [Line Items]
Shares issued, price per share, after tax (in dollars per share)							$ 0.032	$ 9.2082
Class A Common Stock \| Cantor
Related Party Transaction [Line Items]
Investment owned, balance (in shares)		0		0
Class A Common Stock \| CFGM
Related Party Transaction [Line Items]
Investment owned, balance (in shares)		0		0
Class B Common Stock \| Cantor \| Mr. Howard W. Lutnick
Related Party Transaction [Line Items]
Shares issued, price per share, after tax (in dollars per share)							$ 0.032
Class B Common Stock \| Cantor
Related Party Transaction [Line Items]
Investment owned, balance (in shares)		102,300,000		102,300,000
Class B Common Stock \| Cantor \| Mr. Howard W. Lutnick
Related Party Transaction [Line Items]
Investment owned, balance (in shares)							8,973,721
Class B Common Stock \| CFGM
Related Party Transaction [Line Items]
Investment owned, balance (in shares)		3,000,000.0		3,000,000.0
Related Party
Related Party Transaction [Line Items]
Repurchase agreements		$ 0		$ 0		0
Reverse repurchase agreements		0		0		$ 0
Recognition of share of FX gains (losses)		(500,000)	(2,800,000)	(3,300,000)	(2,900,000)
Commissions		$ 100,000	$ 100,000	$ 200,000	$ 200,000
Related Party \| Class B Common Stock \| Cantor
Related Party Transaction [Line Items]
Conversion of stock, shares converted (in shares)	64,000,000.0