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Investment Securities - Amortized Cost and Approximate Fair Values of Investment Securities (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available-for-Sale: |  |
Amortized Cost | $ 2,946.7 | $ 2,945.5
Gross Unrealized Gains | 63.1 | 21.7
Gross Unrealized Losses | (9.5) | (7.2)
Estimated Fair Value | 3,000.3 | 2,960.0
Held-to-Maturity: |  |
Amortized Cost | 70.2 | 92.3
Gross Unrealized Gains | 2.4 | 2.2
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | 72.6 | 94.5
U.S. Treasury Notes |  |
Available-for-Sale: |  |
Amortized Cost | 17.1 | 9.0
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | 17.1 | 9.0
State, county and municipal securities |  |
Available-for-Sale: |  |
Amortized Cost | 111.4 | 80.1
Gross Unrealized Gains | 0.9 | 0.8
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | 112.3 | 80.9
Held-to-Maturity: |  |
Amortized Cost | 55.2 | 57.3
Gross Unrealized Gains | 2.3 | 2.1
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | 57.5 | 59.4
Obligations of U.S. government agencies |  |
Available-for-Sale: |  |
Amortized Cost | 202.7 | 367.5
Gross Unrealized Gains | 1.0 | 0.1
Gross Unrealized Losses | (0.1) | (0.8)
Estimated Fair Value | 203.6 | 366.8
Held-to-Maturity: |  |
Amortized Cost | 9.8 | 19.8
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | 9.8 | 19.8
U.S. agency residential mortgage-backed securities & collateralized mortgage obligations |  |
Available-for-Sale: |  |
Amortized Cost | 2,356.7 | 2,303.6
Gross Unrealized Gains | 60.8 | 19.6
Gross Unrealized Losses | (2.7) | (6.0)
Estimated Fair Value | 2,414.8 | 2,317.2
Held-to-Maturity: |  |
Amortized Cost | 1.2 | 1.2
Gross Unrealized Gains | 0.1 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | 1.3 | 1.2
Private mortgage-backed securities |  |
Available-for-Sale: |  |
Amortized Cost | 41.2 | 47.6
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | (1.2) | (0.4)
Estimated Fair Value | 40.0 | 47.2
Corporate securities |  |
Available-for-Sale: |  |
Amortized Cost | 215.6 | 134.5
Gross Unrealized Gains | 0.4 | 1.2
Gross Unrealized Losses | (5.5) | 0.0
Estimated Fair Value | 210.5 | 135.7
Held-to-Maturity: |  |
Amortized Cost | 3.9 | 13.9
Gross Unrealized Gains | 0.0 | 0.1
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | 3.9 | 14.0
Other investments |  |
Available-for-Sale: |  |
Amortized Cost | 2.0 | 3.2
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | 2.0 | 3.2
Other Investments |  |
Held-to-Maturity: |  |
Amortized Cost | 0.1 | 0.1
Gross Unrealized Gains | 0.0 | 0.0
Gross Unrealized Losses | 0.0 | 0.0
Estimated Fair Value | $ 0.1 | $ 0.1

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121558606&loc=SL82898722-210454 + Details
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