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Investment Securities - Gross Unrealized Losses and Fair Values of Investment Securities (Details)
$ in Millions
Sep. 30, 2020
USD ($)
Investments
Dec. 31, 2019
USD ($)
Investments
Available-for-Sale:    
Available-for-Sale, Less than 12 Months, Fair Value $ 266.9 $ 925.4
Available-for-sale, Less than 12 Months, Gross Unrealized Losses (1.7) (5.4)
Available-for-Sale, 12 Months or More, Fair Value 24.1 202.5
Available-for-Sale, 12 Months or More, Gross Unrealized Losses (0.2) (1.8)
Available-for-Sale, Total Fair Value 291.0 1,127.9
Available-for-Sale, Total Gross Unrealized Losses (1.9) (7.2)
Held-to-Maturity:    
Gross Unrealized Losses 0.0 0.0
Investment securities classified as held to maturity 55.0 92.3
Investment debt securities held-to-maturity 58.4 94.5
Debt Securities, Available-for-sale, Amortized Cost 3,369.2 2,945.5
Gross Unrealized Gains 86.2 21.7
Gross Unrealized Losses (1.9) (7.2)
Gross Unrealized Gains $ 3.4 $ 2.2
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Percent Debt Securities 66.30%  
Investment securities in an unrealized loss position (securities) | Investments 127 331
State, county and municipal securities    
Available-for-Sale:    
Available-for-Sale, Less than 12 Months, Fair Value $ 22.6  
Available-for-sale, Less than 12 Months, Gross Unrealized Losses (0.2)  
Available-for-Sale, 12 Months or More, Fair Value 0.0  
Available-for-Sale, 12 Months or More, Gross Unrealized Losses 0.0  
Available-for-Sale, Total Fair Value 22.6  
Available-for-Sale, Total Gross Unrealized Losses (0.2)  
Held-to-Maturity:    
Gross Unrealized Losses 0.0 $ 0.0
Investment securities classified as held to maturity 49.9 57.3
Investment debt securities held-to-maturity 53.1 59.4
Debt Securities, Available-for-sale, Amortized Cost 233.6 80.1
Gross Unrealized Gains 2.7 0.8
Gross Unrealized Losses (0.2) 0.0
Gross Unrealized Gains 3.2 2.1
Obligations of U.S. government agencies    
Available-for-Sale:    
Available-for-Sale, Less than 12 Months, Fair Value 102.0 185.3
Available-for-sale, Less than 12 Months, Gross Unrealized Losses (0.6) (0.8)
Available-for-Sale, 12 Months or More, Fair Value 0.0 0.0
Available-for-Sale, 12 Months or More, Gross Unrealized Losses 0.0 0.0
Available-for-Sale, Total Fair Value 102.0 185.3
Available-for-Sale, Total Gross Unrealized Losses (0.6) (0.8)
Held-to-Maturity:    
Gross Unrealized Losses   0.0
Investment securities classified as held to maturity   19.8
Investment debt securities held-to-maturity   19.8
Debt Securities, Available-for-sale, Amortized Cost 278.4 367.5
Gross Unrealized Gains 1.0 0.1
Gross Unrealized Losses (0.6) (0.8)
Gross Unrealized Gains   0.0
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations    
Available-for-Sale:    
Available-for-Sale, Less than 12 Months, Fair Value 88.2 740.1
Available-for-sale, Less than 12 Months, Gross Unrealized Losses (0.4) (4.6)
Available-for-Sale, 12 Months or More, Fair Value 11.4 155.9
Available-for-Sale, 12 Months or More, Gross Unrealized Losses (0.1) (1.4)
Available-for-Sale, Total Fair Value 99.6 896.0
Available-for-Sale, Total Gross Unrealized Losses (0.5) (6.0)
Held-to-Maturity:    
Gross Unrealized Losses 0.0 0.0
Investment securities classified as held to maturity 1.0 1.2
Investment debt securities held-to-maturity 1.1 1.2
Debt Securities, Available-for-sale, Amortized Cost 2,535.3 2,303.6
Gross Unrealized Gains 76.9 19.6
Gross Unrealized Losses (0.5) (6.0)
Gross Unrealized Gains 0.1 0.0
Private mortgage-backed securities    
Available-for-Sale:    
Available-for-Sale, Less than 12 Months, Fair Value 0.0 0.0
Available-for-sale, Less than 12 Months, Gross Unrealized Losses 0.0 0.0
Available-for-Sale, 12 Months or More, Fair Value 12.7 46.6
Available-for-Sale, 12 Months or More, Gross Unrealized Losses (0.1) (0.4)
Available-for-Sale, Total Fair Value 12.7 46.6
Available-for-Sale, Total Gross Unrealized Losses (0.1) (0.4)
Held-to-Maturity:    
Debt Securities, Available-for-sale, Amortized Cost 20.0 47.6
Gross Unrealized Gains 0.2 0.0
Gross Unrealized Losses (0.1) (0.4)
Corporate securities    
Available-for-Sale:    
Available-for-Sale, Less than 12 Months, Fair Value 54.1  
Available-for-sale, Less than 12 Months, Gross Unrealized Losses (0.5)  
Available-for-Sale, 12 Months or More, Fair Value 0.0  
Available-for-Sale, 12 Months or More, Gross Unrealized Losses 0.0  
Available-for-Sale, Total Fair Value 54.1  
Available-for-Sale, Total Gross Unrealized Losses (0.5)  
Held-to-Maturity:    
Gross Unrealized Losses 0.0 0.0
Investment securities classified as held to maturity 4.0 13.9
Investment debt securities held-to-maturity 4.1 14.0
Debt Securities, Available-for-sale, Amortized Cost 292.9 134.5
Gross Unrealized Gains 5.4 1.2
Gross Unrealized Losses (0.5) 0.0
Gross Unrealized Gains $ 0.1 $ 0.1