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Derivative Instruments - Gain (Loss) From Derivative Instruments (Details)	1 Months Ended	3 Months Ended		12 Months Ended
	Oct. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019	Dec. 31, 2020 USD ($) instrument	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and Other, net				$ 326,444,000	$ 231,994,000	$ (141,449,000)
Derivative instruments designed as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income				(69,462,000)	0	63,000
Futures | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and Other, net				(6,217,000)	247,619,000	(309,598,000)
Currency forwards | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and Other, net				249,856,000	(44,293,000)	174,310,000
Options | Not designated as hedging instruments
Derivative Instruments, Gain (Loss) [Line Items]
Trading income, net and Other, net				$ 84,695,000	19,692,000	(6,161,000)
Interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Derivative contract term	5 years	5 years	5 years
Derivative, notional amount	$ 525,000,000	$ 1,000,000,000
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				$ (1,890,000)	8,976,000	0
Interest rate swap | Derivative instruments designed as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income				(69,462,000)	0	0
Foreign exchange - forward contract | Derivative instruments designed as hedging instruments:
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income				$ 0	$ 0	$ 63,000

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959

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+ References

No definition available.

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- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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- Definition

The number of derivative instruments of a particular group held by the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

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-Publisher FASB
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-Topic 815
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-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

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- Definition

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

+ References

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Amount, before tax and reclassification, of gain (loss) from derivative designated and qualifying as net investment hedge.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CCC
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998896-113959

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