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Capital Structure - Acquisition of KCG (Details) - Class A - USD ($) $ in Millions |  | 1 Months Ended
--- | --- | ---
Jul. 20, 2017 | May 31, 2018
Class of Stock [Line Items] |  |
Number of shares of stock issued (in shares) |  | 10,518,750
KCG | Aranda |  |
Class of Stock [Line Items] |  |
Number of shares of stock issued (in shares) | 8,012,821 |
Aggregate purchase price | $ 125.0 |
KCG | North Island Stockholder |  |
Class of Stock [Line Items] |  |
Number of shares of stock issued (in shares) | 40,064,103 |
Aggregate purchase price | $ 618.7 |

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