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Derivative Instruments - Gain (Loss) From Derivative Instruments (Details) - USD ($) $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Dec. 31, 2023	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net			$ 247,458	$ 147,833	$ 243,396	$ 212,301
Derivative instruments designed as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income			0	1,391	0	1,822
Futures \| Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net			210,924	56,616	113,651	26,385
Currency forwards \| Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net			30,547	72,937	77,770	161,964
Options \| Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net			5,987	18,405	51,975	26,987
Terminated Interest Rate Swaps \| Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net			0	(125)	0	(3,035)
Interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract term	5 years	2 years
Derivative, notional amount	$ 525,000	$ 1,525,000
Interest rate swap \| Derivative instruments designed as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income			$ 0	$ 1,391	$ 0	$ 1,822