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Related Party Transactions - CEO Program and Other Transactions with CF&Co (Details) - USD ($)					3 Months Ended		9 Months Ended
	May 25, 2023	Jul. 10, 2020	Sep. 27, 2019	Jul. 24, 2018	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jul. 01, 2023	Dec. 31, 2022	Jun. 11, 2020
Debt securities
Related Party Transaction [Line Items]
Debt instrument, authorized repurchase amount									$ 50,000,000		$ 50,000,000
Debt instrument, remaining authorized purchase amount					$ 50,000,000		$ 50,000,000
5.375% Senior Notes due 2023
Related Party Transaction [Line Items]
Principal amount of debt component				$ 450,000,000
Stated interest rate				5.375%
3.750% Senior Notes due 10/1/2024
Related Party Transaction [Line Items]
Principal amount of debt component			$ 300,000,000
Stated interest rate			3.75%
BGC Partners 4.375% Senior Notes due December 15, 2025
Related Party Transaction [Line Items]
Principal amount of debt component		$ 300,000,000
Stated interest rate		4.375%	4.375%		4.375%		4.375%
BGC Partners 8.000% Senior Notes due May 25, 2028
Related Party Transaction [Line Items]
Principal amount of debt component	$ 350,000,000
Stated interest rate	8.00%				8.00%		8.00%
Related Party
Related Party Transaction [Line Items]
Securities loaned					$ 0		$ 0			$ 0
Related party expenses					$ 0	$ 0	$ 0	$ 0
Issuance of common stock (in shares)					0	0	0	0
Related Party | 5.375% Senior Notes due 2023
Related Party Transaction [Line Items]
Advisory fees				$ 200,000
Related Party | 5.375% Senior Notes due 2023 | Underwriting fees
Related Party Transaction [Line Items]
Related party expenses				$ 300,000
Related Party | 3.750% Senior Notes due 10/1/2024 | Underwriting fees
Related Party Transaction [Line Items]
Related party expenses			$ 200,000
Related Party | BGC Partners 4.375% Senior Notes due December 15, 2025
Related Party Transaction [Line Items]
Purchased senior notes					$ 14,500,000		$ 14,500,000
Related Party | BGC Partners 4.375% Senior Notes due December 15, 2025 | Underwriting fees
Related Party Transaction [Line Items]
Related party expenses		$ 200,000
Related Party | BGC Partners 8.000% Senior Notes due May 25, 2028 | Underwriting fees
Related Party Transaction [Line Items]
Related party expenses	$ 300,000

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