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Subsequent Events (Details) - Tradeweb Markets LLC - Subsequent Event - USD ($) $ in Millions | Mar. 22, 2019 | Jun. 30, 2019
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Subsequent Events |  |
Distribution paid to current owners of the Company | $ 20.0 |
Planned event, contingent on closing of IPO | Revolving credit facility |  |
Subsequent Events |  |
Line of credit, maximum borrowing capacity |  | $ 500.0

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