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Investment Securities (Schedule of Amortized Cost and Fair Value Maturities with Changes Recorded in Net Income) (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
Total debt securities available-for-sale, Fair Value $ 5,854.7 6,011.8
Weighted Average Yield 2.62%  
U.S. government/sponsored agency – Residential    
Schedule of Available-for-sale Securities [Line Items]    
After 5 through 10 years, Amortized Cost $ 9.7  
Due after 10 years, Amortized Cost 4,249.3  
Debt securities, Amortized Cost 4,259.0 4,766.4
After 5 through 10 years, Fair value 10.2  
Due after 10 years, Fair Value 4,381.8  
Total debt securities available-for-sale, Fair Value $ 4,392.0 4,773.8
After 5 through 10 years, Weighted Average Yield 2.67%  
Due after 10 years, Weighted Average Yield 2.60%  
Weighted Average Yield 2.60%  
U.S. government/sponsored agency – Commercial    
Schedule of Available-for-sale Securities [Line Items]    
After 1 through 5 years, Amortized Cost $ 17.0  
After 5 through 10 years, Amortized Cost 362.3  
Due after 10 years, Amortized Cost 740.2  
Debt securities, Amortized Cost 1,119.5 554.5
After 1 through 5 years, Fair Value 17.4  
After 5 through 10 years, Fair value 388.6  
Due after 10 years, Fair Value 750.6  
Total debt securities available-for-sale, Fair Value $ 1,156.6 564.8
After 1 through 5 years, Weighted Average Yield 2.95%  
After 5 through 10 years, Weighted Average Yield 2.81%  
Due after 10 years, Weighted Average Yield 2.30%  
Weighted Average Yield 2.48%  
U.S. government/sponsored agency obligations    
Schedule of Available-for-sale Securities [Line Items]    
After 5 through 10 years, Amortized Cost $ 118.2  
Due after 10 years, Amortized Cost 110.3  
Debt securities, Amortized Cost 228.5 449.4
After 5 through 10 years, Fair value 118.8  
Due after 10 years, Fair Value 110.5  
Total debt securities available-for-sale, Fair Value $ 229.3 444.0
After 5 through 10 years, Weighted Average Yield 2.69%  
Due after 10 years, Weighted Average Yield 2.78%  
Weighted Average Yield 2.73%  
U.S. Treasury securities    
Schedule of Available-for-sale Securities [Line Items]    
Due in 1 year or less, Amortized Cost $ 4.3  
After 1 through 5 years, Amortized Cost 5.0  
Debt securities, Amortized Cost 9.3 11.2
Due in 1 year or less, Fair Value 4.3  
After 1 through 5 years, Fair Value 5.0  
Total debt securities available-for-sale, Fair Value $ 9.3 11.3
Due in 1 year or less, Weighted Average Yield 2.48%  
After 1 through 5 years, Weighted Average Yield 0.53%  
Weighted Average Yield 1.44%  
Agency Asset-Backed Securities    
Schedule of Available-for-sale Securities [Line Items]    
Due after 10 years, Amortized Cost $ 1.8  
Debt securities, Amortized Cost 1.8  
Due after 10 years, Fair Value 1.8  
Total debt securities available-for-sale, Fair Value $ 1.8  
Due after 10 years, Weighted Average Yield 2.24%  
Weighted Average Yield 2.24%  
Corporate bonds - foreign    
Schedule of Available-for-sale Securities [Line Items]    
Due in 1 year or less, Amortized Cost $ 65.9  
Debt securities, Amortized Cost 65.9 [1] 65.9
Due in 1 year or less, Fair Value 65.7  
Total debt securities available-for-sale, Fair Value $ 65.7 [1] $ 67.1
Due in 1 year or less, Weighted Average Yield 6.09%  
Weighted Average Yield 6.09%  
[1] There was an immaterial amount of ACL under CECL as of March 31, 2020.