Organization and Basis of Presentation (Details) $ / shares in Units, $ in Billions		3 Months Ended
Mar. 01, 2019 USD ($) $ / shares	Mar. 31, 2019 country segment
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Number of countries in which entity operates \| country		36
Number of operating segments		2
Number of non-operating segments		1
ITG
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Acquisition value (in dollars per share) \| $ / shares	$ 30.30
Total cash consideration \| $	$ 1.0
Virtu Financial
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Ownership interest (as a percent)		57.00%

Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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- Definition

The number of countries in which the entity operates as of balance sheet date.

+ References

No definition available.

+ Details

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

No definition available.

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- Definition

The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3213-108585

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- Definition

Number Of Non-Operating Segments

+ References

No definition available.

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- Definition

[Line Items] for Organization, Consolidation And Presentation Of Financial Statements [Table]

+ References

No definition available.

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