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Stockholder's Equity - Redemptions and Exchange of LLC Interests (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 08, 2019 | Oct. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2019
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Weighted Weighted Average Share Price |  |  | $ 21.62 | $ 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 |  |  |
LLC units | Redemptions and Exchanges of LLC Interests [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Number of LLC Units received from the exchange transaction |  |  |  |  | 271,184
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 | Redemptions and Exchanges of LLC Interests [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Issuance of common stock (in shares) |  |  |  |  | 271,184
Class D common stock |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Issuance of common stock (in shares) |  |  |  | 69,282,736 |
Class D common stock | Redemptions and Exchanges of LLC Interests [Member] |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Stock Repurchased and Retired During Period, Shares |  |  |  |  | 271,184
Class B common stock |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Issuance of common stock (in shares) | 96,933,192 |  |  | 96,933,192 |
Class C common stock |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Issuance of common stock (in shares) |  |  |  | 10,006,269 |
Tradeweb Markets LLC |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Weighted Weighted Average Share Price | $ 27.00 |  |  |  |
Net proceeds | $ 1,200.0 |  |  |  |
Ownership interest | 64.30% |  | 73.40% | 73.40% | 73.40%
Equity interest of noncontrolling shareholders in consolidated entity |  |  | 26.60% | 26.60% | 26.60%
Tradeweb Markets LLC | Public Investors |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Equity interest of noncontrolling shareholders in consolidated entity |  |  | 29.80% | 29.80% | 29.80%
Tradeweb Markets LLC | Bank Stockholders |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Equity interest of noncontrolling shareholders in consolidated entity |  |  | 16.20% | 16.20% | 16.20%
Tradeweb Markets Inc | Public Investors |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Voting power percentage |  |  | 4.30% | 4.30% | 4.30%
Tradeweb Markets Inc | Bank Stockholders |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Voting power percentage |  |  | 18.40% | 18.40% | 18.40%
Tradeweb Markets Inc | Class A common stock | Public Investors |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Number of share owned |  |  | 66,408,328 | 66,408,328 | 66,408,328
Tradeweb Markets Inc | Class D common stock | Bank Stockholders |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Number of share owned |  |  | 27,662,354 | 27,662,354 | 27,662,354
Tradeweb Markets Inc | Class C common stock | Bank Stockholders |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Number of share owned |  |  | 8,328,983 | 8,328,983 | 8,328,983
Tradeweb Markets LLC |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Weighted Weighted Average Share Price | $ 27.00 |  |  |  |
Net proceeds | $ 1,200.0 |  |  |  |
Refinitiv | Tradeweb Markets LLC |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Ownership interest |  |  | 53.90% | 53.90% | 53.90%
Refinitiv | Tradeweb Markets Inc |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Ownership interest |  |  | 77.20% | 77.20% | 77.20%
Refinitiv | Tradeweb Markets Inc | Class D common stock |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Number of share owned |  |  | 22,988,329 | 22,988,329 | 22,988,329
Refinitiv | Tradeweb Markets Inc | Class B common stock |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Number of share owned |  |  | 96,933,192 | 96,933,192 | 96,933,192

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