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Derivative Instruments and Hedging Activities (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Xe Operations [Member] | Foreign Exchange Contracts [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset, notional amount $ 1,100   $ 1,100   $ 1,300,000,000
United States of America, Dollars | Ria Operations [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset, notional amount         246,000
United States of America, Dollars | Ria Operations [Member] | Foreign Exchange Contracts [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset, notional amount 220,000   220,000    
Euro Member Countries, Euro | Ria Operations [Member] | Foreign Exchange Contracts [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative asset, notional amount 99,000   $ 99,000   $ 454,000,000
Maximum [Member] | Ria Operations [Member] | Foreign Exchange Contracts [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Foreign currency forward contract term     14 days    
Trading Revenue [Member] | Xe Operations [Member] | Foreign Exchange Contracts [Member]          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Foreign currency exchange margin $ 19,900 $ 13,200,000 $ 38,400,000 $ 31,300,000