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Capital Structure (Details)
$ in Millions
 1 Months Ended 3 Months Ended
Aug. 10, 2017
USD ($)
shares
Jul. 20, 2017
USD ($)
shares
Feb. 28, 2018
shares
Feb. 28, 2017
shares
Mar. 31, 2018
Vote
class
Apr. 21, 2015
shares
Class of Stock [Line Items]            
Number of classes of common stock | class         4  
Virtu Financial            
Class of Stock [Line Items]            
Ownership interest (as a percent)         49.10%  
VFH            
Class of Stock [Line Items]            
Issuance of common stock in connection with employee exchanges (in shares)     795,521 683,762    
Common stock exchange ratio         1  
Class A | 2015 Management Incentive Plan            
Class of Stock [Line Items]            
Number of shares of stock authorized           16,000,000
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  
NIH Investment Agreement | Class A            
Class of Stock [Line Items]            
Number of shares of stock issued 338,124          
Aggregate purchase price | $ $ 5.2          
KCG | Aranda | Class A            
Class of Stock [Line Items]            
Number of shares of stock issued   6,346,155        
Aggregate purchase price | $   $ 99.0        
KCG | NIH Investment Agreement            
Class of Stock [Line Items]            
Number of shares of stock issued   39,725,979        
Aggregate purchase price | $   $ 613.5        
KCG | NIH Investment Agreement | Class A            
Class of Stock [Line Items]            
Number of shares of stock issued 338,124          
Aggregate purchase price | $ $ 5.2          
KCG | Temasek Investment | Class A            
Class of Stock [Line Items]            
Number of shares of stock issued 1,666,666          
Aggregate purchase price | $ $ 26.0