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Stockholder's Equity - Authorized shares (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 Vote $ / shares shares | Jun. 28, 2019 $ / shares | Apr. 08, 2019 | Dec. 31, 2018 $ / shares shares
Class of Stock [Line Items] |  |  |  |
Preferred stock, shares authorized | shares | 250,000,000 |  |  | 250,000,000
Preferred stock, par value | $ / shares | $ 0.00001 |  |  | $ 0.00001
Class A common stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common Stock, shares authorized | shares | 1,000,000,000 |  |  |
Common stock, par value | $ / shares | $ 0.00001 |  |  |
Number of votes per common stock | Vote | 1 |  |  |
Conversion ratio | 1 |  |  |
Class B common stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common Stock, shares authorized | shares | 450,000,000 |  |  |
Common stock, par value | $ / shares | $ 0.00001 | $ 0.00001 |  |
Number of votes per common stock | Vote | 10 |  |  |
Class C common stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common Stock, shares authorized | shares | 350,000,000 |  |  |
Common stock, par value | $ / shares | $ 0.00001 |  |  |
Number of votes per common stock | Vote | 1 |  |  |
Conversion ratio | 1 |  |  |
Class D common stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common Stock, shares authorized | shares | 300,000,000 |  |  |
Common stock, par value | $ / shares | $ 0.00001 |  |  |
Number of votes per common stock | Vote | 10 |  |  |
Voting power threshold percentage to require conversion of shares |  |  | 4.90% |
Tradeweb Markets LLC |  |  |  |
Class of Stock [Line Items] |  |  |  |
Threshold percentage of economic interest for conversion | 10.00% |  |  |
Cancellation ratio | 1 |  |  |
Minimum | Class D common stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Voting power threshold percentage to require conversion of shares |  |  | 4.90% |

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