Derivative Instruments - Gain (Loss) From Derivative Instruments (Details) $ in Thousands	1 Months Ended		3 Months Ended		12 Months Ended
	Dec. 31, 2023 USD ($) instrument	Oct. 31, 2019 USD ($)	Mar. 31, 2020 USD ($) instrument	Dec. 31, 2019 USD ($)	Dec. 31, 2023 USD ($) instrument	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net					$ 162,784	$ 298,210	$ 378,516
Derivative instruments designed as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income					(35,990)	106,329	44,541
Futures | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net					297,345	257,258	283,482
Currency forwards | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net					(150,071)	12,492	1,077
Options | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net					21,224	30,339	95,828
Interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract term	2 years	5 years	5 years	5 years
Derivative, notional amount	$ 1,525,000	$ 525,000	$ 1,000,000	$ 525,000	$ 1,525,000
Number of interest rate swaps | instrument	2		2		2
Interest rate swap | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net					$ (1,720)	(1,879)	(1,871)
Interest rate swap | Derivative instruments designed as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income					(35,990)	106,329	44,541
Terminated interest rate swaps | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net					$ (3,994)	$ 0	$ 0