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Related Party Transactions - CEO Program and Other Transactions with CF&Co (Details) - USD ($) shares in Millions				12 Months Ended
	May 25, 2023	Sep. 27, 2019	Jul. 24, 2018	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jul. 10, 2020	Jun. 11, 2020
Related Party Transaction [Line Items]
Purchased senior notes				$ 50,000,000
Payables to related parties						$ 8,300,000
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 notes			$ 450,000,000
Stated interest rate			5.375%
3.750% Senior Notes due 10/1/2024
Related Party Transaction [Line Items]
Principal amount of notes		$ 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 notes							$ 300,000,000
Stated interest rate		4.375%		4.375%			4.375%
BGC Partners 8.000% Senior Notes due May 25, 2028
Related Party Transaction [Line Items]
Principal amount of notes	$ 350,000,000
Stated interest rate	8.00%
Related Party
Related Party Transaction [Line Items]
Related party expenses				$ 0	$ 0	$ 0
Issuance of Class A common stock (net of costs) (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 \| Underwriting fees
Related Party Transaction [Line Items]
Related party expenses				$ 200,000
Purchased senior notes				$ 14,500,000
Related Party \| BGC Partners 8.000% Senior Notes due May 25, 2028 \| Underwriting fees
Related Party Transaction [Line Items]
Related party expenses	$ 200,000