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Capital Structure - Employee Exchanges (Details)
12 Months Ended
Dec. 31, 2018
shares
Dec. 31, 2017
shares
Virtu Financial    
Class of Stock [Line Items]    
Ownership interest (as a percent) 56.70%  
VFH    
Class of Stock [Line Items]    
Common stock exchange ratio 1  
VFH | Class A    
Class of Stock [Line Items]    
Issuance of common stock in connection with employee exchanges (in shares) 4,089,598 1,355,763