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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 |

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- 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 + Details
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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 -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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- Definition Minimum amount of net capital required to be maintained by the entity to engage in securities transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
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