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Stockholder's Equity - Issuance and Cancellation of Common Stock (Details) - shares |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 08, 2019 | Jun. 30, 2019 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |
Shares contributed by Refinitiv Owner |  | 96,933,192 |
Continuing LLC Owners |  |  |
Class of Stock [Line Items] |  |  |
Percentage of combined voting power | 27.50% |  |
Refinitiv Direct Owner [Member] |  |  |
Class of Stock [Line Items] |  |  |
Shares contributed by Refinitiv Owner | 96,933,192 |  |
Class A common stock |  |  |
Class of Stock [Line Items] |  |  |
Number of shares owned | 46,000,000 |  |
Percentage of combined voting power | 2.70% |  |
Class B common stock |  |  |
Class of Stock [Line Items] |  |  |
Shares contributed by Refinitiv Owner | 96,933,192 |  |
Number of shares canceled | 9,993,731 |  |
Class B common stock | Refinitiv Direct Owner [Member] |  |  |
Class of Stock [Line Items] |  |  |
Number of shares owned | 96,933,192 |  |
Percentage of combined voting power | 56.40% |  |
Class C common stock |  |  |
Class of Stock [Line Items] |  |  |
Shares issued to acquire TWM LLC | 20,000,000 |  |
Number of shares canceled | 9,993,731 |  |
Class C common stock | Continuing LLC Owners |  |  |
Class of Stock [Line Items] |  |  |
Number of shares owned | 10,006,269 |  |
Class D common stock |  |  |
Class of Stock [Line Items] |  |  |
Shares issued to acquire TWM LLC | 105,289,005 |  |
Number of shares canceled | 36,006,269 |  |
Class D common stock | Continuing LLC Owners |  |  |
Class of Stock [Line Items] |  |  |
Number of shares owned | 46,294,407 |  |
Class D common stock | Refinitiv LLC Owner [Member] |  |  |
Class of Stock [Line Items] |  |  |
Percentage of combined voting power | 13.40% |  |
Number of LLC Interest | 22,988,329 |  |
Tradeweb Markets LLC |  |  |
Class of Stock [Line Items] |  |  |
Number of LLC Interest |  |  | 59,182,155
Ownership percentage, Continuing LLC Owners |  |  | 26.60%
Number of LLC Interest held by parent | 142,933,192 |  | 163,341,520
Ownership interest | 64.30% |  | 73.40%
Tradeweb Markets LLC | Continuing LLC Owners |  |  |
Class of Stock [Line Items] |  |  |
Number of LLC Interest | 56,300,676 |  |
Ownership percentage, Continuing LLC Owners | 25.30% |  |
Tradeweb Markets LLC | Class A common stock |  |  |
Class of Stock [Line Items] |  |  |
Percentage of economic interest | 20.70% |  |
Tradeweb Markets LLC | Class B common stock | Refinitiv Direct Owner [Member] |  |  |
Class of Stock [Line Items] |  |  |
Percentage of economic interest | 43.60% |  |
Tradeweb Markets LLC | Class D common stock | Refinitiv LLC Owner [Member] |  |  |
Class of Stock [Line Items] |  |  |
Number of LLC Interest | 22,988,329 |  |
Ownership percentage, Continuing LLC Owners | 10.30% |  |

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