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Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Numerator:      
Net income attributable to Tradeweb Markets Inc. $ 309,338 $ 226,828 $ 166,296
Less: Distributed and undistributed earnings allocated to unvested RSUs and unsettled vested PRSUs (244) 0 0
Net income attributable to outstanding shares of Class A and Class B common stock - Basic 309,094 226,828 166,296
Net income attributable to outstanding shares of Class A and Class B common stock - Diluted $ 309,094 $ 226,828 $ 166,296
Denominator:      
Weighted average shares of Class A and Class B common stock outstanding - Basic (in shares) 205,576,637 201,419,081 180,409,462
Dilutive effect (in shares) 2,823,403    
Weighted average shares of Class A and Class B common stock outstanding - Diluted (in shares) 208,400,040 207,254,840 188,223,032
Earnings per share - Basic (in dollars per share) $ 1.50 $ 1.13 $ 0.92
Earnings per share - Diluted (in dollars per share) $ 1.48 $ 1.09 $ 0.88
Weighted average unvested RSUs and unsettled vested PRSUs that were considered participating securities (in shares) 193,441 0 0
Equity-Settled PRSUs      
Denominator:      
Dilutive effect (in shares) 770,726 2,067,558 2,472,801
Options      
Denominator:      
Dilutive effect (in shares) 1,810,956 3,473,549 5,179,109
RSUs      
Denominator:      
Dilutive effect (in shares) 241,721 294,652 161,660