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v3.19.3.a.u2

Non-Controlling Interests (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 08, 2019 shares | Mar. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Sep. 30, 2018 | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 | Dec. 31, 2017
Non-Controlling Interests |  |  |  |  |  |  |  |
Financial Designation, Predecessor and Successor [Fixed List] |  | Successor | Successor | Successor | Predecessor | Successor | Successor | Predecessor
Net income attributable to Tradeweb Markets Inc. |  |  |  |  |  | $ 83,769 |  |
Allocation of equity to non-controlling interests arising from the reorganization transactions and IPO |  |  |  |  |  | (1,607,529) |  |
Change in non-controlling interests as a result of the October 2019 follow-on offering and other ownership changes |  |  |  |  |  | 402,227 |  |
Net transfers (to) from non-controlling interests |  |  |  |  |  | (1,205,302) |  |
Change from net income attributable to Tradeweb Markets Inc. and transfers (to) from non-controlling interests |  |  |  |  |  | $ (1,121,533) |  |
Class A common stock |  |  |  |  |  |  |  |
Non-Controlling Interests |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  | 1 |  |
Class B common stock |  |  |  |  |  |  |  |
Non-Controlling Interests |  |  |  |  |  |  |  |
Conversion ratio |  |  |  |  |  | 1 |  |
Tradeweb Markets LLC |  |  |  |  |  |  |  |
Non-Controlling Interests |  |  |  |  |  |  |  |
Number of LLC Interests held by Tradeweb Markets Inc. | shares | 142,933,192 |  |  |  |  | 163,341,520 |  |
Number of LLC Interests held by non-controlling interests | shares |  |  |  |  |  | 59,182,155 |  |
Total LLC Interests outstanding | shares |  |  |  |  |  | 222,523,675 |  |
Number of LLC Interests held by Tradeweb Markets Inc. | 64.30% |  |  | 73.40% |  | 73.40% |  |
Equity interest of noncontrolling shareholders in consolidated entity |  |  |  | 26.60% |  | 26.60% |  |
Total LLC Interests outstanding |  |  |  | 100.00% |  | 100.00% |  |

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