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Investment Securities - Gross Unrealized Losses and Fair Values of Investment Securities (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Available-for-Sale: |  |
Available-for-Sale, Less than 12 Months, Fair Value | $ 467.6 | $ 1,123.2
Available-for-sale, Less than 12 Months, Gross Unrealized Losses | (3.9) | (22.6)
Available-for-Sale, 12 Months or More, Fair Value | 407.8 | 779.0
Available-for-Sale, 12 Months or More, Gross Unrealized Losses | (2.6) | (14.5)
Available-for-Sale, Total Fair Value | 875.4 | 1,902.2
Available-for-Sale, Total Gross Unrealized Losses | (6.5) | (37.1)
Held-to-Maturity: |  |
Held-to-Maturity, Less than 12 Months, Fair Value | 19.7 | 90.4
Held-to-Maturity, Less Than 12 Months, Gross Unrealized Losses | (0.1) | (2.8)
Held-to-Maturity, 12 Months or More, Fair Value | 0.0 | 216.9
Held-to-Maturity, 12 Months or More, Gross Unrealized Losses | 0.0 | (5.5)
Held-to-Maturity, Total Fair Value | 19.7 | 307.3
Held-to-Maturity, Total Gross Unrealized Losses | (0.1) | (8.3)
State, county and municipal securities |  |
Held-to-Maturity: |  |
Held-to-Maturity, Less than 12 Months, Fair Value |  | 25.9
Held-to-Maturity, Less Than 12 Months, Gross Unrealized Losses |  | (0.3)
Held-to-Maturity, 12 Months or More, Fair Value |  | 57.1
Held-to-Maturity, 12 Months or More, Gross Unrealized Losses |  | (0.6)
Held-to-Maturity, Total Fair Value |  | 83.0
Held-to-Maturity, Total Gross Unrealized Losses |  | (0.9)
Obligations of U.S. government agencies |  |
Available-for-Sale: |  |
Available-for-Sale, Less than 12 Months, Fair Value | 168.1 | 363.1
Available-for-sale, Less than 12 Months, Gross Unrealized Losses | (0.8) | (7.9)
Available-for-Sale, 12 Months or More, Fair Value | 119.4 | 154.5
Available-for-Sale, 12 Months or More, Gross Unrealized Losses | (0.5) | (2.3)
Available-for-Sale, Total Fair Value | 287.5 | 517.6
Available-for-Sale, Total Gross Unrealized Losses | (1.3) | (10.2)
Held-to-Maturity: |  |
Held-to-Maturity, Less than 12 Months, Fair Value |  | 19.5
Held-to-Maturity, Less Than 12 Months, Gross Unrealized Losses |  | (0.3)
Held-to-Maturity, 12 Months or More, Fair Value |  | 0.0
Held-to-Maturity, 12 Months or More, Gross Unrealized Losses |  | 0.0
Held-to-Maturity, Total Fair Value |  | 19.5
Held-to-Maturity, Total Gross Unrealized Losses |  | (0.3)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations |  |
Available-for-Sale: |  |
Available-for-Sale, Less than 12 Months, Fair Value | 299.5 | 735.2
Available-for-sale, Less than 12 Months, Gross Unrealized Losses | (3.1) | (14.5)
Available-for-Sale, 12 Months or More, Fair Value | 240.3 | 503.7
Available-for-Sale, 12 Months or More, Gross Unrealized Losses | (1.6) | (9.6)
Available-for-Sale, Total Fair Value | 539.8 | 1,238.9
Available-for-Sale, Total Gross Unrealized Losses | (4.7) | (24.1)
Held-to-Maturity: |  |
Held-to-Maturity, Less than 12 Months, Fair Value |  | 45.0
Held-to-Maturity, Less Than 12 Months, Gross Unrealized Losses |  | (2.2)
Held-to-Maturity, 12 Months or More, Fair Value |  | 120.2
Held-to-Maturity, 12 Months or More, Gross Unrealized Losses |  | (4.3)
Held-to-Maturity, Total Fair Value |  | 165.2
Held-to-Maturity, Total Gross Unrealized Losses |  | (6.5)
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 | 48.1 | 69.4
Available-for-Sale, 12 Months or More, Gross Unrealized Losses | (0.5) | (1.8)
Available-for-Sale, Total Fair Value | 48.1 | 69.4
Available-for-Sale, Total Gross Unrealized Losses | (0.5) | (1.8)
Corporate securities |  |
Available-for-Sale: |  |
Available-for-Sale, Less than 12 Months, Fair Value |  | 24.9
Available-for-sale, Less than 12 Months, Gross Unrealized Losses |  | (0.2)
Available-for-Sale, 12 Months or More, Fair Value |  | 51.4
Available-for-Sale, 12 Months or More, Gross Unrealized Losses |  | (0.8)
Available-for-Sale, Total Fair Value |  | 76.3
Available-for-Sale, Total Gross Unrealized Losses |  | (1.0)
Held-to-Maturity: |  |
Held-to-Maturity, Less than 12 Months, Fair Value | 19.7 | 0.0
Held-to-Maturity, Less Than 12 Months, Gross Unrealized Losses | (0.1) | 0.0
Held-to-Maturity, 12 Months or More, Fair Value | 0.0 | 39.6
Held-to-Maturity, 12 Months or More, Gross Unrealized Losses | 0.0 | (0.6)
Held-to-Maturity, Total Fair Value | 19.7 | 39.6
Held-to-Maturity, Total Gross Unrealized Losses | $ (0.1) | $ (0.6)

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