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ITG Acquisition - Pro Forma Results, Narrative (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended
	Mar. 01, 2019	Mar. 31, 2019
Business Acquisition [Line Items]
Advisory and other professional fees		$ 15.1
ITG
Business Acquisition [Line Items]
Advisory and other professional fees		$ 18.2
Common stock, par value (in dollars per share)	$ 0.01
Right to receive cash (in dollars per share)	$ 30.30

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Face amount or stated value per share of common stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

The amount of advisory and other professional fees incurred during the reporting period.

+ References

No definition available.

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- Definition

Amount of cash receivable per share without interest, less any applicable withholding taxes upon cancellation and extinguishment of shares issued in acquisition.

+ References

No definition available.

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