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Related Party Transactions - CEO Program and Other Transactions with CF&Co (Details) - USD ($)						3 Months Ended		9 Months Ended
	Jun. 10, 2024	May 25, 2023	Jul. 10, 2020	Sep. 27, 2019	Jul. 24, 2018	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Aug. 21, 2024	Jun. 11, 2020
Related Party Transaction [Line Items]
Issuance of common stock (in shares)							55,348
Debt instrument, remaining authorized purchase amount						$ 49,500,000		$ 49,500,000
Maximum
Related Party Transaction [Line Items]
Purchased senior notes											$ 50,000,000
5.375% Senior Notes due 2023
Related Party Transaction [Line Items]
Principal amount of debt component					$ 450,000,000.0
Stated interest rate					5.375%
3.750% Senior Notes due 10/1/2024
Related Party Transaction [Line Items]
Principal amount of debt component				$ 300,000,000.0
Stated interest rate				3.75%
BGC Partners 8.000% Senior Notes due May 25, 2028
Related Party Transaction [Line Items]
Stated interest rate		8.00%				8.00%		8.00%		8.00%
Debt instrument, repurchased face amount										$ 500,000
BGC Partners 4.375% Senior Notes due December 15, 2025
Related Party Transaction [Line Items]
Principal amount of debt component			$ 300,000,000.0
Stated interest rate			4.375%
BGC Group 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%
BGC Group 6.600% Senior Notes due June 10, 2029
Related Party Transaction [Line Items]
Principal amount of debt component	$ 500,000,000
Stated interest rate	6.60%
Underwriting fees paid	$ 400,000
Related Party
Related Party Transaction [Line Items]
Issuance of common stock (in shares)						0	0	0	0
Related party expenses						$ 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 Group 8.000% Senior Notes due May 25, 2028 | Underwriting fees
Related Party Transaction [Line Items]
Related party expenses		$ 200,000

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