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Non-Controlling Interests -Schedule of the Ownership Interest in Noncontrolling Interest (Details) - Tradeweb Markets LLC - shares
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Non-Controlling Interests      
Number of LLC Interests held by Tradeweb Markets Inc. (in shares) 213,215,797 211,601,209  
Number of LLC Interests held by non-controlling interests (in shares) 23,076,973 23,080,571  
Total LLC Interests outstanding (in shares) 236,292,770 234,681,780  
Number of LLC Interests held by Tradeweb Markets Inc. 90.20% 90.20% 90.20%
Number of LLC Interests held by non-controlling interests 9.80% 9.80% 9.80%
Total LLC Interests outstanding 100.00% 100.00%