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Related Party Transactions - Transactions with Executive Officers and Directors (Details)															1 Months Ended							3 Months Ended						9 Months Ended
	Aug. 08, 2024 $ / shares shares	Jan. 02, 2024 $ / shares shares	Sep. 21, 2023 $ / shares shares	Jul. 12, 2023 USD ($)	Jul. 12, 2023 GBP (£)	Jul. 11, 2023 GBP (£)	Jul. 10, 2023 USD ($) $ / shares shares	Jul. 01, 2023 USD ($) shares	Jun. 30, 2023 USD ($) shares	Jun. 08, 2023 $ / shares shares	Jun. 02, 2023 $ / shares shares	May 18, 2023 USD ($) $ / shares shares	Apr. 18, 2023 $ / shares shares	Apr. 01, 2021 shares	Sep. 30, 2024 shares	Aug. 31, 2024 shares	Jul. 31, 2024 shares	Sep. 30, 2023 shares	Aug. 31, 2023 shares	Jul. 31, 2023 shares	Apr. 30, 2023 shares	Sep. 30, 2024 USD ($) $ / shares shares	Jun. 30, 2024 shares	Mar. 31, 2024 shares	Sep. 30, 2023 $ / shares shares	Jun. 30, 2023 shares	Mar. 31, 2023 shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 $ / shares shares
Related Party Transaction [Line Items]
Repurchase of class A common stock (in shares)															1,046,000	4,807,000	2,040,000	3,474,000	1,612,000	3,000,000		7,893,000	10,688,000	11,250,000	8,087,000	9,814,000	846,000	29,831,000	18,747,000
Deed of amendment, notice period				24 months	24 months
Class A Common Stock
Related Party Transaction [Line Items]
Repurchase of class A common stock (in shares)																						7,013,116			8,086,750			26,264,523	18,746,467
Stock repurchased, weighted average price (in dollars per share) | $ / shares																						$ 9.05			$ 4.99			$ 8.06	$ 4.70
Shares granted in period (in shares)								600,000,000
Share price (in dollars per share) | $ / shares							$ 4.45
Share-based payment arrangement, decrease for tax withholding obligation | $																						$ 3,700,000						$ 24,900,000
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
Aggregate estimated grant date fair value | $				$ 3,986,600																								$ 43,413,000
Restricted Stock Units (RSUs) | Mr. Windeatt
Related Party Transaction [Line Items]
Vested in period (in shares)							720,509
Share-based payment arrangement, decrease for tax withholding obligation | $							$ 780,333
Related Party
Related Party Transaction [Line Items]
Shares withheld for tax withholding obligation, price per share (in dollars per share) | $ / shares												$ 4.61
Related Party | Mr. Lutnick
Related Party Transaction [Line Items]
Determination amount | $												$ 6,650,000
Related Party | Mr. Windeatt
Related Party Transaction [Line Items]
Drawings, aggregate amount, per year | £					£ 700,000	£ 600,000
Related Party | Class A Common Stock | Reporting Person
Related Party Transaction [Line Items]
Repurchase of class A common stock (in shares)	13,063	136,891	474,808
Stock repurchased, weighted average price (in dollars per share) | $ / shares	$ 9.11	$ 6.98	$ 5.29
Related Party | Class A Common Stock | Mr. Merkel
Related Party Transaction [Line Items]
Repurchase of class A common stock (in shares)											150,000
Stock repurchased, weighted average price (in dollars per share) | $ / shares											$ 4.21
Grants in period, net (in shares)												196,525
Related Party | Class A Common Stock | Mr. Lutnick
Related Party Transaction [Line Items]
Grants in period, net (in shares)												5,710,534
Related Party | Class A Common Stock | Ms. Bell
Related Party Transaction [Line Items]
Repurchase of class A common stock (in shares)													21,786
Stock repurchased, weighted average price (in dollars per share) | $ / shares													$ 4.59
Related Party | Exchangeable Limited Partnership Units
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)									1,500,000
Related Party | Exchangeable Limited Partnership Units | Reporting Person
Related Party Transaction [Line Items]
Repurchase of class A common stock (in shares)										128,279
Stock repurchased, weighted average price (in dollars per share) | $ / shares										$ 4.79
Shares granted in period (in shares)																					128,279
Related Party | Non-exchangeable LPUs | Reporting Person
Related Party Transaction [Line Items]
Shares granted in period (in shares)														128,279
Related Party | NPU-CV, PSU-CV & PSU | Mr. Merkel
Related Party Transaction [Line Items]
Shares redeemed in period | $												$ 0
Related Party | NPSU-CV | Mr. Merkel
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)												148,146
Related Party | PSU-CV | Mr. Merkel
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)												33,585
Related Party | PSU | Mr. Merkel
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)												74,896
Related Party | PSU | Mr. Lutnick
Related Party Transaction [Line Items]
Shares redeemed in period | $												$ 0
Related Party | Share-Based Payment Arrangement | Class A Common Stock
Related Party Transaction [Line Items]
Shares granted in period (in shares)									1,000,000
Related Party | Share-Based Payment Arrangement | Class A Common Stock | Mr. Merkel
Related Party Transaction [Line Items]
Shares granted in period (in shares)												256,627
Related Party | Share-Based Payment Arrangement | Class A Common Stock | Mr. Lutnick
Related Party Transaction [Line Items]
Grants in period, net (in shares)												232,610
Related Party | Share-Based Payment Arrangement | Class A Common Stock | Mr. Lutnick | Non-exchangeable PSU
Related Party Transaction [Line Items]
Shares granted in period (in shares)												11,332,727
Related Party | Share-Based Payment Arrangement | Class A Common Stock | Mr. Lutnick | Exchangeable PSU
Related Party Transaction [Line Items]
Shares granted in period (in shares)												520,380
Related Party | NPPSU-CV & PPSU-CV | Mr. Merkel
Related Party Transaction [Line Items]
Shares redeemed in period | $												$ 843,750
Related Party | NPPSU-CV | Mr. Merkel
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)												148,146
Determination amount | $												$ 681,250
Related Party | PPSU-CV | Mr. Merkel
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)												33,585
Determination amount | $												$ 162,500
Related Party | Non-exchangeable PSUs & PPSUs | Prior To 5/18/2023 | Mr. Lutnick
Related Party Transaction [Line Items]
Determination amount | $												$ 474,195
Related Party | Non-exchangeable PSU | Mr. Lutnick
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)												11,332,727
Related Party | Non-exchangeable PSU | Prior To 5/18/2023 | Mr. Lutnick
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)												7,879,736
Related Party | Non-exchangeable PPSU | Prior To 5/18/2023 | Mr. Lutnick
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)												103,763
Related Party | Incrementally Monetized Non-exchangeable PSUs & PPSUs | Mr. Lutnick
Related Party Transaction [Line Items]
Shares redeemed in period | $												$ 6,650,000
Related Party | Incrementally Monetized Non-exchangeable PSUs & PPSUs | On 5/18/2023 | Mr. Lutnick
Related Party Transaction [Line Items]
Determination amount | $												$ 6,175,805
Related Party | Incrementally Monetized Non-exchangeable PSU | On 5/18/2023 | Mr. Lutnick
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)												3,452,991
Related Party | Incrementally Monetized Non-exchangeable PPSU | Mr. Lutnick
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)												1,451,805
Related Party | Incrementally Monetized Non-exchangeable PPSU | On 5/18/2023 | Mr. Lutnick
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)												1,348,042
Related Party | Exchangeable PSU | Mr. Lutnick
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)												520,380
Related Party | Non-exchangeable HDU | Mr. Lutnick
Related Party Transaction [Line Items]
Shares redeemed in period (in shares)												1,474,930
Related Party | Non-exchangeable HDU | Mr. Lutnick | Newmark
Related Party Transaction [Line Items]
Shares redeemed in period | $												$ 9,148,000
Related Party | Non-exchangeable HDU | Mr. Lutnick | BGC Partners
Related Party Transaction [Line Items]
Shares redeemed in period | $												$ 2,100,000
Related Party | Restricted Stock Units (RSUs)
Related Party Transaction [Line Items]
Shares granted in period (in shares)									16,900,000

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