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Securities (Reconciliation of Amortized Cost to Fair Value of Securities Available for Sale) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Investment Holdings [Line Items]    
Total Fair Value $ 37,741.5 $ 41,155.7
GROSS UNREALIZED GAINS 444.2 897.6
GROSS UNREALIZED LOSSES 152.8 31.3
FAIR VALUE 38,032.9 42,022.0
U.S. Government    
Investment Holdings [Line Items]    
Total Fair Value 2,517.1 2,728.8
GROSS UNREALIZED GAINS 40.6 71.1
GROSS UNREALIZED LOSSES 7.5 0.0
FAIR VALUE 2,550.2 2,799.9
Obligations of States and Political Subdivisions    
Investment Holdings [Line Items]    
Total Fair Value 3,682.1 2,927.8
GROSS UNREALIZED GAINS 95.3 155.9
GROSS UNREALIZED LOSSES 27.3 0.1
FAIR VALUE 3,750.1 3,083.6
Government Sponsored Agency    
Investment Holdings [Line Items]    
Total Fair Value 18,498.2 24,595.1
GROSS UNREALIZED GAINS 134.4 388.5
GROSS UNREALIZED LOSSES 90.9 26.9
FAIR VALUE 18,541.7 24,956.7
Non-U.S. Government    
Investment Holdings [Line Items]    
Total Fair Value 277.3 713.6
GROSS UNREALIZED GAINS 0.1 1.1
GROSS UNREALIZED LOSSES 4.0 0.7
FAIR VALUE 273.4 714.0
Corporate Debt    
Investment Holdings [Line Items]    
Total Fair Value 2,395.2 2,459.9
GROSS UNREALIZED GAINS 51.0 79.8
GROSS UNREALIZED LOSSES 2.4 0.1
FAIR VALUE 2,443.8 2,539.6
Covered Bonds    
Investment Holdings [Line Items]    
Total Fair Value 552.6 543.1
GROSS UNREALIZED GAINS 6.4 10.0
GROSS UNREALIZED LOSSES 0.0 0.0
FAIR VALUE 559.0 553.1
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds    
Investment Holdings [Line Items]    
Total Fair Value 2,996.1 2,281.7
GROSS UNREALIZED GAINS 40.7 64.7
GROSS UNREALIZED LOSSES 14.1 0.6
FAIR VALUE 3,022.7 2,345.8
Other Asset-Backed    
Investment Holdings [Line Items]    
Total Fair Value 5,618.1 3,953.5
GROSS UNREALIZED GAINS 22.7 46.8
GROSS UNREALIZED LOSSES 5.8 2.8
FAIR VALUE 5,635.0 3,997.5
Commercial Mortgage-Backed    
Investment Holdings [Line Items]    
Total Fair Value 1,204.8 952.2
GROSS UNREALIZED GAINS 53.0 79.7
GROSS UNREALIZED LOSSES 0.8 0.1
FAIR VALUE $ 1,257.0 $ 1,031.8