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Derivative Instruments - Gain (Loss) From Derivative Instruments (Details) - USD ($) $ in Thousands	1 Months Ended			3 Months Ended		9 Months Ended
	Jun. 30, 2024	Dec. 31, 2023	Oct. 31, 2019	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net				$ (19,939)	$ 24,016	$ 192,362	$ 69,099
Derivative instruments designed as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income				430	(12,918)	2,252	607
Futures | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net				52,183	170,492	78,568	198,194
Currency forwards | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net				(14,985)	(145,529)	146,979	(144,070)
Options | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net				(57,011)	8,894	(30,024)	42,212
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract term		2 years	5 years
Derivative, notional amount	$ 1,075,000	$ 1,525,000	$ 525,000
Gain on derivative instrument	$ 5,700
Interest Rate Swap | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net				0	0	0	5,686
Interest Rate Swap | Derivative instruments designed as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income				430	(12,918)	2,252	607
Terminated Interest Rate Swaps | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net				$ (126)	$ (9,841)	$ (3,161)	$ (32,923)

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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