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Borrowings (Schedule of FHLB Balances) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
FHLB advances, financing availability $ 8,758.5 $ 6,350.5
Advances (3,050.0) (1,650.0)
Available capacity 5,708.5 4,700.5
Pledged assets $ 10,314.3 $ 6,987.6
FHLB advances, weighted average percentage rates 1.03% 2.04%
Lending assets    
Debt Instrument [Line Items]    
FHLB advances, financing availability $ 5,879.0  
Advances (3,050.0)  
Available capacity 2,829.0  
Pledged assets 7,308.0  
High quality liquid securities    
Debt Instrument [Line Items]    
FHLB advances, financing availability 2,879.5  
Available capacity 2,879.5  
Pledged assets $ 3,006.3 $ 50.4