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ITG Acquisition - Purchase Price and Goodwill (Details) - USD ($)
$ / shares in Units, $ in Thousands
Mar. 01, 2019
Dec. 31, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill   $ 1,148,926 $ 1,148,926
ITG      
Business Acquisition [Line Items]      
Total cash consideration $ 1,000,000    
Acquisition value (in dollars per share) $ 30.30    
Goodwill $ 312,343