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Regulatory Requirement (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($)
Regulatory Requirement
Number of broker-dealer subsidiaries | item	2
Broker Dealer Subsidiary One
Regulatory Requirement
Minimum net capital required to be maintained by broker-dealer subsidiaries	$ 1.0	$ 1.0
Net capital	57.0	74.5
Excess net capital over the required net capital	56.0	73.5
Broker Dealer Subsidiary Two
Regulatory Requirement
Minimum net capital required to be maintained by broker-dealer subsidiaries	1.0	1.0
Net capital	11.9	10.8
Excess net capital over the required net capital	10.9	9.8
VFCM
Regulatory Requirement
Minimum capital required to be maintained in connection with the operation of the Company's DMM business	1.8	$ 1.9
Required amount under exchange rules	$ 1.0
Required amount under exchange rules as percentage of market value	15.00%
Number of trading units whose market value is considered to calculate required net capital under exchange act | item	60

X

- Definition

The amount of net capital in excess of the minimum required net capital.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

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- Definition

Minimum amount of net capital required to be maintained by entity's broker-dealer subsidiary to engage in securities transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
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Minimum amount of net capital required to be maintained by the entity to engage in securities transactions.

+ References

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- Definition

Net capital is equal to the net worth of the broker dealer, less certain items such as exchange memberships, carrying value of securities not readily marketable, haircuts on marketable securities in proprietary accounts, furniture and equipment and other illiquid assets as defined.

+ References

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- Definition

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- Definition

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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.

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- Definition

Represents the amount of minimum net capital required to be maintained by the entity under the exchange act.

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Percentage of net capital required to be maintained under minimum financial requirements, pursuant to the exchange Act.

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