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Stockholder's Equity (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Apr. 08, 2019 | Oct. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Weighted Weighted Average Share Price |  |  | $ 21.62 | $ 21.62
LLC units | October 2019 Follow-On Offering |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Stock Repurchased and Retired During Period, Shares |  | 19,835,666 |  |
Class A common stock |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Issuance of common stock (in shares) |  |  |  | 46,000,000
Class A common stock | October 2019 Follow-On Offering |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Issuance of common stock (in shares) |  |  | 19,881,059 |
Weighted Weighted Average Share Price |  | $ 42.00 |  |
Net proceeds |  | $ 810.0 |  |
Stock Repurchased and Retired During Period, Shares |  | 45,393 |  |
Class A common stock | Initial Public Offering |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Issuance of common stock (in shares) | 46,000,000 |  |  |
Weighted Weighted Average Share Price | $ 27.00 |  |  |
Class A common stock | Over allotment |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Issuance of common stock (in shares) | 6,000,000 | 2,593,181 |  |
Tradeweb Markets LLC |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Weighted Weighted Average Share Price | $ 27.00 |  |  |
Net proceeds | $ 1,200.0 |  |  |

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