Organization and Basis of Presentation (Details) - USD ($)			3 Months Ended		6 Months Ended
	Jul. 01, 2023	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Total number of shares (in shares)		0
Conversion of stock, shares converted (in shares)	64,000,000
Minimum number of shares required to be issued (in shares)	75,000,000.0
Stock Purchased On 6/30/2023
Related Party Transaction [Line Items]
Conversion of stock, shares converted (in shares)	5,700,000
Class A Common Stock
Related Party Transaction [Line Items]
Shares granted in period (in shares)	600,000,000
Share-based payment arrangement, decrease for tax withholding obligation			$ 10,300,000		$ 21,200,000
Issuance of common stock (in shares)			122,220	166,280	168,894	179,583
Common stock, shares authorized (in shares)	1,500,000,000		1,500,000,000		1,500,000,000		1,500,000,000
Common stock, par value (in dollars per share)			$ 0.01		$ 0.01		$ 0.01
Class A Common Stock | BGC Partners
Related Party Transaction [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
Class A Common Stock | BGC Group
Related Party Transaction [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
Class B Common Stock
Related Party Transaction [Line Items]
Issuance of common stock (in shares)	64,000,000		0	0	0	0
Common stock, shares authorized (in shares)	300,000,000		300,000,000		300,000,000		300,000,000
Common stock, par value (in dollars per share)			$ 0.01		$ 0.01		$ 0.01
Class B Common Stock | BGC Partners
Related Party Transaction [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
Class B Common Stock | BGC Group
Related Party Transaction [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
Related Party
Related Party Transaction [Line Items]
Issuance of common stock (in shares)			0	0	0	0
Non-exchangeable Limited Partnership Interests
Related Party Transaction [Line Items]
Share-based payment arrangement, expense		$ 60,900,000
Exchangeable Limited Partnership Units | Related Party
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)		1,500,000
Share-Based Payment Arrangement | Related Party | Class A Common Stock
Related Party Transaction [Line Items]
Shares granted in period (in shares)		1,000,000
Restricted Stock Units (RSUs)
Related Party Transaction [Line Items]
Shares granted in period (in shares)	25,300,000
Share-based payment arrangement, decrease for tax withholding obligation	$ 74,000,000	$ 49,200,000
Corporate conversion, exchange ratio (in shares)		1		1		1
Restricted Stock Units (RSUs) | Related Party
Related Party Transaction [Line Items]
Shares granted in period (in shares)		16,900,000
Non-exchangeable FPUs | Related Party
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)		5,600,000
FPU | Related Party
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)		5,425,209
Shares exchanged in period (in shares)		324,223
Cantor Units | Related Party
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)		324,223
Cantor Units | Related Party | Cantor
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)		5,425,209
Shares redeemed in period, value		$ 9,715,772
FPU & Cantor Units | Related Party
Related Party Transaction [Line Items]
Shares redeemed in period, value		$ 598,712
Restricted Shares
Related Party Transaction [Line Items]
Share-based payment arrangement, expense			$ 8,900,000		$ 44,300,000
Restricted Shares | Maximum
Related Party Transaction [Line Items]
Shares granted in period (in shares)	38,600,000