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Stockholders' Equity - Narrative (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2022
Tradeweb Markets LLC    
Class of Stock [Line Items]    
Cancellation ratio   1
Class A Common Stock | Over-Allotment Option    
Class of Stock [Line Items]    
Shares issued to underwriters (in shares) 1,674,162  
Class A Common Stock | April 2020 Follow-On Offering    
Class of Stock [Line Items]    
Issuance of common stock, net of offering costs and cancellations (in shares) 12,835,245  
Weighted average share price (in dollars per share) | $ / shares $ 50.25  
Net proceeds | $ $ 626.3  
Stock repurchased and retired (in shares) 596,418  
LLC Interests | April 2020 Follow-On Offering    
Class of Stock [Line Items]    
Stock repurchased and retired (in shares) 12,238,827