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Earnings Per Share - Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Numerator:        
Net income attributable to Tradeweb Markets Inc. $ 68,344 $ 55,316 $ 151,309 $ 123,175
Less: Distributed and undistributed earnings allocated to unvested RSUs and unsettled vested PRSUs (26) 0 (53) 0
Net income attributable to outstanding shares of Class A and Class B common stock - Basic 68,318 55,316 151,256 123,175
Net income attributable to outstanding shares of Class A and Class B common stock - Diluted $ 68,318 $ 55,316 $ 151,256 $ 123,175
Denominator:        
Weighted average shares of Class A and Class B common stock outstanding - Basic (in shares) 204,501,035 201,749,985 204,282,406 200,414,714
Dilutive effect (in shares) 2,771,640   3,088,966  
Weighted average shares of Class A and Class B common stock outstanding - Diluted (in shares) 207,272,675 207,463,960 207,371,372 206,253,756
Earnings per share - Basic (in dollars per share) $ 0.33 $ 0.27 $ 0.74 $ 0.61
Earnings per share - Diluted (in dollars per share) $ 0.33 $ 0.27 $ 0.73 $ 0.60
Weighted average unvested RSUs and unsettled vested PRSUs that were considered participating securities (in shares) 76,426 0 80,778 0
PRSUs        
Denominator:        
Dilutive effect (in shares) 782,955 2,021,234 765,497 1,926,771
Options        
Denominator:        
Dilutive effect (in shares) 1,839,177 3,461,230 2,080,602 3,656,412
RSUs        
Denominator:        
Dilutive effect (in shares) 149,508 231,511 242,867 255,859