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Fair Value of Financial Instruments - Contingent Consideration (Details) - Tradeweb Markets LLC - Predecessor | Dec. 31, 2017 item
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Standard deviation |
Fair Value of Financial Instruments |
Contingent consideration, measurement input | 1,666,667
Revenue multiple |
Fair Value of Financial Instruments |
Contingent consideration, measurement input | 7.03
Discount rate |
Fair Value of Financial Instruments |
Contingent consideration, measurement input | 0.0164

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