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Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) $ / shares shares | Dec. 31, 2022
Tradeweb Markets LLC |  |
Class of Stock [Line Items] |  |
Cancellation ratio |  | 1
Class A Common Stock | Over-Allotment Option |  |
Class of Stock [Line Items] |  |
Shares issued to underwriters (in shares) | 1,674,162 |
Class A Common Stock | April 2020 Follow-On Offering |  |
Class of Stock [Line Items] |  |
Issuance of common stock, net of offering costs and cancellations (in shares) | 12,835,245 |
Weighted average share price (in dollars per share) | $ / shares | $ 50.25 |
Net proceeds | $ | $ 626.3 |
Stock repurchased and retired (in shares) | 596,418 |
LLC Interests | April 2020 Follow-On Offering |  |
Class of Stock [Line Items] |  |
Stock repurchased and retired (in shares) | 12,238,827 |

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