Related Party Transactions - Transactions with Executive Officers and Directors, 2 (Details)													1 Months Ended	12 Months Ended
	Jul. 12, 2023 USD ($)	Jul. 12, 2023 GBP (£)	Jul. 11, 2023 GBP (£)	Jul. 10, 2023 USD ($) $ / shares shares	Jul. 01, 2023 USD ($)	Jun. 30, 2023 USD ($)	Aug. 11, 2022 USD ($) $ / shares shares	Dec. 21, 2021 USD ($) shares	Jun. 28, 2021 USD ($) $ / shares shares	Apr. 29, 2021 USD ($) shares	Apr. 23, 2021 USD ($) $ / shares shares	Feb. 22, 2021 USD ($) shares	Oct. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	Apr. 08, 2021 shares	Mar. 02, 2020 $ / shares
Related Party Transaction [Line Items]
Deed of amendment, notice period	24 months	24 months
Share-based payment arrangement, decrease for tax withholding obligation | $													$ 5,000,000
Number of H Units redeemed (in shares)									1,131,774
Payment related to H Units redeemed | $									$ 7,017,000
Number of preferred H Units redeemed (in shares)									1,018,390
Payment related tax for redeemed preferred H Units | $									$ 7,983,000
Restricted Stock Units (RSUs)
Related Party Transaction [Line Items]
Share-based payment arrangement, decrease for tax withholding obligation | $					$ 74,000,000	$ 49,200,000
Aggregate estimated grant date fair value | $	$ 3,986,600													$ 62,494,000	$ 18,743,000	$ 12,792,000
Related Party
Related Party Transaction [Line Items]
Issuance of Class A common stock (net of costs) (in shares)														0	0
Mr. Windeatt | Restricted Stock Units (RSUs)
Related Party Transaction [Line Items]
Vested in period (in shares)				720,509
Share-based payment arrangement, decrease for tax withholding obligation | $				$ 780,333
Mr. Windeatt | Related Party
Related Party Transaction [Line Items]
Drawings, aggregate amount, per year | £		£ 700,000	£ 600,000
Mr. Merkel
Related Party Transaction [Line Items]
Payment related to exchangeable PPSUs redeemed | $								$ 555,990
Number of non-exchangeable PPSU approved redemption (in shares)								90,366
Payment related to non exchangeable PPSU approved redemption | $								$ 0
Number of exchangeable PPSU (in shares)								149,301
Mr. Lutnick
Related Party Transaction [Line Items]
Number of non-exchangeable PSU (in shares)								2,011,731
Payment related to non-exchangeable PSU redeemed | $								$ 0
Payment related to exchangeable PPSUs redeemed | $								$ 1,525,706
Number of non-exchangeable PPSU approved redemption (in shares)								1,939,896
Payment related to non exchangeable PPSU approved redemption | $								$ 10,851,803
Number of exchangeable PPSU (in shares)								425,766
Number of H Units redeemed (in shares)								376,651
Number of HDUs redeemed (in shares)								376,651
Payment related to H Units redeemed | $								$ 2,339,003
Number of preferred H Units redeemed (in shares)								463,969
Payment related tax for redeemed preferred H Units | $								$ 2,661,000
Mr. Lutnick | Exchange LPUs For Common Stock
Related Party Transaction [Line Items]
Exchange share price (in dollars per share) | $ / shares									$ 5.86
Number of shares redeemed (in shares)									0
Number of non-exchangeable LPU (in shares)									88,636
Number of exchangeable LPU exchanged for issuance of shares (in shares)									520,380
Mr. Lutnick | Exchange PLPUs for Common Stock
Related Party Transaction [Line Items]
Number of exchangeable PLPUs (in shares)									425,765
Payment related tax for redeemed PLPU | $									$ 1,525,705
Class A Common Stock
Related Party Transaction [Line Items]
Issuance of Class A common stock (net of costs) (in shares)														518,191	500,697	417,247
Number of shares repurchased (in shares)															27,100,000
Share price (in dollars per share) | $ / shares				$ 4.45
Class A Common Stock | Mr. Merkel
Related Party Transaction [Line Items]
Issuance of Class A common stock (net of costs) (in shares)								90,366
Class A Common Stock | Mr. Lutnick
Related Party Transaction [Line Items]
Issuance of Class A common stock (net of costs) (in shares)								2,011,731
Class A Common Stock | Mr. Lutnick | Exchange LPUs For Common Stock
Related Party Transaction [Line Items]
Issuance of Class A common stock (net of costs) (in shares)									520,380
Common stock, shares issued net of shares for tax withholdings (in shares)									365,229
Class A Common Stock | Mr. Lutnick | Exchange PLPUs for Common Stock
Related Party Transaction [Line Items]
Issuance of Class A common stock (net of costs) (in shares)									88,636
Common stock, shares issued net of shares for tax withholdings (in shares)									41,464
Stephen M. Merkel
Related Party Transaction [Line Items]
Number of non-exchangeable units redeemed (in shares)										108,350
Number of non-exchangeable PSU (in shares)										273,612
Payment related to non-exchangeable PSU redeemed | $										$ 0
Number of non-exchangeable PPSU redeemed (in shares)										101,358
Number of non-exchangeable PPSU (in shares)										250,659
Payment related to exchangeable PPSUs redeemed | $										$ 575,687
Stephen M. Merkel | Class A Common Stock
Related Party Transaction [Line Items]
Issuance of Class A common stock (net of costs) (in shares)										108,350
Number of shares repurchased (in shares)										108,350
Sean A. Windeatt
Related Party Transaction [Line Items]
Stock repurchase program, remaining number of shares authorized to be repurchased (in shares)																	62,211
Exchange share price (in dollars per share) | $ / shares							$ 4.08				$ 5.65							$ 5.38
Shares authorized to be repurchased (in shares)							135,514				123,713
Number of shares redeemed (in shares)							27,826				28,477
Number of shares redeemed, value | $							$ 134,678				$ 178,266
Number of exchange rights grant (in shares)												123,713
Number of non-exchangeable LPU (in shares)												123,713
Number of PLPU share issued for non-exchangeable (in shares)												28,477
Payment of withholding tax rate for common stock issue | $												$ 178,266
Sean A. Windeatt | Class A Common Stock
Related Party Transaction [Line Items]
Number of exchangeable LPU exchanged for issuance of shares (in shares)												123,713