Derivative Instruments - Gain (Loss) From Derivative Instruments (Details)	1 Months Ended	3 Months Ended		12 Months Ended
	Oct. 31, 2019	Mar. 31, 2020 USD ($) instrument	Dec. 31, 2019 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net				$ 378,516,000	$ 326,444,000	$ 231,994,000
Derivative instruments designed as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income				44,541,000	(69,462,000)	0
Futures | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net				283,482,000	(6,217,000)	247,619,000
Currency forwards | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net				1,077,000	249,856,000	(44,293,000)
Options | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net				95,828,000	84,695,000	19,692,000
Interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract term	5 years	5 years	5 years
Derivative, notional amount		$ 1,000,000,000	$ 525,000,000			525,000,000
Number of interest rate swaps | instrument		2
Interest rate swap | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and other, net				(1,871,000)	(1,890,000)	8,976,000
Interest rate swap | Derivative instruments designed as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income				$ 44,541,000	$ (69,462,000)	$ 0