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Pledged Assets, Collateral and Restricted Assets (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Cash, held in foreign currency $ 642,800,000   $ 642,800,000   $ 330,400,000
Restricted cash 553,600,000   553,600,000   574,200,000
Average deposits maintained to meet Federal Reserve Bank reserve requirements 0 $ 0 0 $ 0  
Collateral that may be repledged or sold          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Financial instruments owned at fair value 39,000,000,000.0   39,000,000,000.0   43,200,000,000
Asset Pledged as Collateral with Right          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Financial instruments owned at fair value 540,700,000   540,700,000   464,700,000
Collateral Requirements | Collateral that may be repledged or sold          
Financial Instruments Owned and Pledged as Collateral [Line Items]          
Financial instruments owned at fair value $ 13,100,000,000   $ 13,100,000,000   $ 8,700,000,000