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Investment Securities - Gross Unrealized Losses and Fair Values of Investment Securities (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Available-for-Sale: |  |
Available-for-Sale, Less than 12 Months, Fair Value | $ 175.0 | $ 925.4
Available-for-sale, Less than 12 Months, Gross Unrealized Losses | (1.5) | (5.4)
Available-for-Sale, 12 Months or More, Fair Value | 37.6 | 202.5
Available-for-Sale, 12 Months or More, Gross Unrealized Losses | (0.2) | (1.8)
Available-for-Sale, Total Fair Value | 212.6 | 1,127.9
Available-for-Sale, Total Gross Unrealized Losses | (1.7) | (7.2)
State, county and municipal securities |  |
Available-for-Sale: |  |
Available-for-Sale, Less than 12 Months, Fair Value | 15.1 |
Available-for-sale, Less than 12 Months, Gross Unrealized Losses | (0.1) |
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 | 15.1 |
Available-for-Sale, Total Gross Unrealized Losses | (0.1) |
Obligations of U.S. government agencies |  |
Available-for-Sale: |  |
Available-for-Sale, Less than 12 Months, Fair Value |  | 185.3
Available-for-sale, Less than 12 Months, Gross Unrealized Losses |  | (0.8)
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 |  | 185.3
Available-for-Sale, Total Gross Unrealized Losses |  | (0.8)
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations |  |
Available-for-Sale: |  |
Available-for-Sale, Less than 12 Months, Fair Value | 113.2 | 740.1
Available-for-sale, Less than 12 Months, Gross Unrealized Losses | (0.6) | (4.6)
Available-for-Sale, 12 Months or More, Fair Value | 19.3 | 155.9
Available-for-Sale, 12 Months or More, Gross Unrealized Losses | (0.1) | (1.4)
Available-for-Sale, Total Fair Value | 132.5 | 896.0
Available-for-Sale, Total Gross Unrealized Losses | (0.7) | (6.0)
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 | 18.3 | 46.6
Available-for-Sale, 12 Months or More, Gross Unrealized Losses | (0.1) | (0.4)
Available-for-Sale, Total Fair Value | 18.3 | 46.6
Available-for-Sale, Total Gross Unrealized Losses | (0.1) | $ (0.4)
Corporate securities |  |
Available-for-Sale: |  |
Available-for-Sale, Less than 12 Months, Fair Value | 46.7 |
Available-for-sale, Less than 12 Months, Gross Unrealized Losses | (0.8) |
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 | 46.7 |
Available-for-Sale, Total Gross Unrealized Losses | $ (0.8) |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27337-111563 + Details
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