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Capital Structure (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 10, 2017 USD ($) shares | Jul. 20, 2017 USD ($) shares | Feb. 28, 2018 shares | Feb. 28, 2017 shares | Mar. 31, 2018 Vote class | Apr. 21, 2015 shares
Class of Stock [Line Items] |  |  |  |  |  |
Number of classes of common stock | class |  |  |  |  | 4 |
Virtu Financial |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Ownership interest (as a percent) |  |  |  |  | 49.10% |
VFH |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of common stock in connection with employee exchanges (in shares) |  |  | 795,521 | 683,762 |  |
Common stock exchange ratio |  |  |  |  | 1 |
Class A | 2015 Management Incentive Plan |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of shares of stock authorized |  |  |  |  |  | 16,000,000
Class A common stock and Class C common stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of votes | Vote |  |  |  |  | 1 |
Class B common stock and Class D common stock |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of votes | Vote |  |  |  |  | 10 |
NIH Investment Agreement | Class A |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of shares of stock issued | 338,124 |  |  |  |  |
Aggregate purchase price | $ | $ 5.2 |  |  |  |  |
KCG | Aranda | Class A |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of shares of stock issued |  | 6,346,155 |  |  |  |
Aggregate purchase price | $ |  | $ 99.0 |  |  |  |
KCG | NIH Investment Agreement |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of shares of stock issued |  | 39,725,979 |  |  |  |
Aggregate purchase price | $ |  | $ 613.5 |  |  |  |
KCG | NIH Investment Agreement | Class A |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of shares of stock issued | 338,124 |  |  |  |  |
Aggregate purchase price | $ | $ 5.2 |  |  |  |  |
KCG | Temasek Investment | Class A |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of shares of stock issued | 1,666,666 |  |  |  |  |
Aggregate purchase price | $ | $ 26.0 |  |  |  |  |

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