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Related Party Transactions - BGC Credit Agreement (Details) - USD ($)								3 Months Ended		9 Months Ended
	Sep. 25, 2024	Jul. 31, 2024	Jun. 10, 2024	Jun. 07, 2024	Mar. 12, 2024	Mar. 08, 2024	Mar. 19, 2018	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Apr. 01, 2024	Dec. 31, 2023	Aug. 06, 2018
Related Party
Related Party Transaction [Line Items]
Interest income								$ 4,400,000	$ 2,000,000.0	$ 10,200,000	$ 5,900,000
Revolving credit facility | BGC Credit Agreement | Related Party
Related Party Transaction [Line Items]
Principal amount of debt component				$ 400,000,000		$ 400,000,000	$ 250,000,000.0							$ 400,000,000.0
Basis points (less than)						0.25%
Average interest rate (as a percent)					6.92%	1.00%
Debt instrument, extended term (in years)						1 year
Debt instrument, non-extension notice term							6 months
Maturity term maximum				35 days
Proceeds from borrowings					$ 275,000,000
Line of credit facility, outstanding amount								0		0		$ 275,000,000.0	$ 0
Interest expense recorded								0	0	1,100,000	0
Interest income								3,000,000	$ 0	$ 3,800,000	$ 0
Revolving credit facility | BGC Credit Agreement | Related Party | Cantor
Related Party Transaction [Line Items]
Average interest rate (as a percent)										6.96%
Proceeds from borrowings			$ 180,000,000
Repayment of outstanding borrowings	$ 12,000,000.0	$ 18,000,000.0
Line of credit facility, outstanding amount								150,000,000		$ 150,000,000
Senior Revolving Credit Agreement | Unsecured Credit Agreement
Related Party Transaction [Line Items]
Average interest rate (as a percent)									7.15%	7.18%	6.99%
Repayment of outstanding borrowings					$ 240,000,000
Interest expense recorded								$ 500,000	$ 3,700,000	$ 8,400,000	$ 6,600,000

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