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Deposits (Schedule of Detail on Deposit Types) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Deposits [Abstract]    
Interest-bearing $ 39,372.3 $ 33,546.4
Non-interest bearing 2,789.8 1,593.1
Total deposits $ 42,162.1 $ 35,139.5