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Investment Securities (Amortized Cost and Fair Value of AFS and HTM Securities) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, Amortized Cost $ 5,684.0 $ 5,998.2
Debt securities, Unrealized Gains Gross 173.7 37.5
Debt securities, Unrealized Losses Gross (3.0) (23.9)
Debt securities, Fair Value 5,854.7 6,011.8
U.S. government/sponsored agency – Residential    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, Amortized Cost 4,259.0 4,766.4
Debt securities, Unrealized Gains Gross 135.2 24.1
Debt securities, Unrealized Losses Gross (2.2) (16.7)
Debt securities, Fair Value 4,392.0 4,773.8
U.S. government/sponsored agency – Commercial    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, Amortized Cost 1,119.5 554.5
Debt securities, Unrealized Gains Gross 37.7 12.1
Debt securities, Unrealized Losses Gross (0.6) (1.8)
Debt securities, Fair Value 1,156.6 564.8
U.S. government/sponsored agency obligations    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, Amortized Cost 228.5 449.4
Debt securities, Unrealized Gains Gross 0.8 0.0
Debt securities, Unrealized Losses Gross 0.0 (5.4)
Debt securities, Fair Value 229.3 444.0
U.S. Treasury securities    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, Amortized Cost 9.3 11.2
Debt securities, Unrealized Gains Gross 0.0 0.1
Debt securities, Unrealized Losses Gross 0.0 0.0
Debt securities, Fair Value 9.3 11.3
Agency Asset-Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, Amortized Cost 1.8  
Debt securities, Unrealized Gains Gross 0.0  
Debt securities, Unrealized Losses Gross 0.0  
Debt securities, Fair Value 1.8  
Corporate bonds - foreign    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, Amortized Cost 65.9 [1] 65.9
Debt securities, Unrealized Gains Gross 0.0 [1] 1.2
Debt securities, Unrealized Losses Gross (0.2) [1] 0.0
Debt securities, Fair Value $ 65.7 [1] 67.1
Supranational securities    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, Amortized Cost   149.8
Debt securities, Unrealized Gains Gross   0.0
Debt securities, Unrealized Losses Gross   0.0
Debt securities, Fair Value   149.8
State & municipal bonds    
Schedule of Available-for-sale Securities [Line Items]    
Debt securities, Amortized Cost   1.0
Debt securities, Unrealized Gains Gross   0.0
Debt securities, Unrealized Losses Gross   0.0
Debt securities, Fair Value   $ 1.0
[1] There was an immaterial amount of ACL under CECL as of March 31, 2020.