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ITG Acquisition - Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 01, 2019
Sep. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill   $ 1,148,926 $ 1,148,926
Customer relationships      
Business Acquisition [Line Items]      
Intangible assets   404,262 440,144
Trade names      
Business Acquisition [Line Items]      
Intangible assets   $ 1,700 $ 2,600
ITG      
Business Acquisition [Line Items]      
Intangible assets $ 517,200    
Goodwill 312,343    
Total 829,543    
ITG | Technology      
Business Acquisition [Line Items]      
Intangible assets $ 76,000    
Amortization Years 5 years    
ITG | Customer relationships      
Business Acquisition [Line Items]      
Intangible assets $ 437,600    
Amortization Years 10 years    
ITG | Trade names      
Business Acquisition [Line Items]      
Intangible assets $ 3,600    
Amortization Years 3 years