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Commitments, Contingencies and Guarantees (Details)		1 Months Ended		3 Months Ended	9 Months Ended
	Sep. 02, 2014 exchange	Sep. 30, 2018 kr / shares	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($) shares	Sep. 30, 2018 USD ($)	Sep. 13, 2018 kr / $	Dec. 31, 2017 USD ($)
Commitments and Contingencies Disclosure [Line Items]
Financial guarantees obtained						$ 12,000,000		$ 14,000,000
SEK exchange rate | kr / $							8.96
National exchanges named as defendants | exchange	7
eSpeed
Commitments and Contingencies Disclosure [Line Items]
Contingent future issuance of common stock (in shares) | shares					992,247
Revenue required to trigger annual issuance of Nasdaq common stock					$ 25,000,000
Property Lease Guarantee
Commitments and Contingencies Disclosure [Line Items]
Other guarantees						4,000,000		3,000,000
Escrow Agreement
Commitments and Contingencies Disclosure [Line Items]
Contingency, accrual						11,000,000
Escrow Agreement | Other current liabilities
Commitments and Contingencies Disclosure [Line Items]
Contingency, accrual						9,000,000
Escrow Agreement | Other non-current liabilities
Commitments and Contingencies Disclosure [Line Items]
Contingency, accrual						2,000,000
Clearinghouse Credit Facilities
Commitments and Contingencies Disclosure [Line Items]
Credit facility, available liquidity						219,000,000		$ 187,000,000
ICBC
Commitments and Contingencies Disclosure [Line Items]
Margin deposits contributed to brokers						15,000,000
Contribution of Equity Capital | OCC
Commitments and Contingencies Disclosure [Line Items]
Commitment contributions						$ 200,000,000
OCC
Commitments and Contingencies Disclosure [Line Items]
Ownership percentage						40.00%
OCC | Contribution of Equity Capital
Commitments and Contingencies Disclosure [Line Items]
Commitment contributions						$ 80,000,000
Cinnober
Commitments and Contingencies Disclosure [Line Items]
SEK per share offering (in SEK per share) | kr / shares		kr 75
SEK per warrant offering (in SEK per warrant) | kr / shares		kr 85
Payments to acquire businesses			$ 190,000,000
Scenario, Forecast | Cinnober
Commitments and Contingencies Disclosure [Line Items]
Payments to acquire businesses				$ 190,000,000

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