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Capital Structure - Narrative (Details)
 9 Months Ended
Sep. 30, 2025
class
vote
shares
Sep. 30, 2024
shares
Dec. 31, 2024
shares
Class of Stock [Line Items]      
Number of classes of common stock | class 4    
Non-voting common interest units outstanding (in shares) | shares 3,402,959   3,994,744
Number of non-voting common interest units forfeited or repurchased (in shares) | shares 591,785 32,946  
Virtu Financial      
Class of Stock [Line Items]      
Ownership interest 57.20%    
Class A common stock and Class C common stock      
Class of Stock [Line Items]      
Number of votes | vote 1    
Class B common stock and Class D common stock      
Class of Stock [Line Items]      
Number of votes | vote 10    
Class C common stock and class D common stock | Founder | Virtu Financial      
Class of Stock [Line Items]      
Ownership interest 87.10%