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Commitments, Contingencies and Guarantees (Narrative) (Details) - USD ($)
Sep. 07, 2021
Aug. 06, 2021
Aug. 10, 2020
Sep. 30, 2021
Commitment And Contingencies [Line Items]        
Damage awarded $ 6,600,000      
Guarantees, Fair Value Disclosure       $ 0
Trading Technologies Matter [Member]        
Commitment And Contingencies [Line Items]        
Damages sought   $ 962,400,000    
FINRA [Member]        
Commitment And Contingencies [Line Items]        
Settlement, penalties agreed to paid     $ 15,000,000  
SEC [Member]        
Commitment And Contingencies [Line Items]        
Settlement, penalties agreed to paid     11,500,000  
CFTC [Member]        
Commitment And Contingencies [Line Items]        
Settlement, penalties agreed to paid     11,500,000  
Disgorgement [Member]        
Commitment And Contingencies [Line Items]        
Settlement, penalties agreed to paid     $ 700,000