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3. Fair Value and Gross Unrealized Losses with Unrealized Losses (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 0.2 | $ 0.4
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 | 0.1
Debt Securities, Available-for-sale, Unrealized Loss Position | 35.9 | 111.8
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 35.9 | 91.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0.0 | 19.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.2 | 0.3
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0.1 | 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 | 0.0
Debt Securities, Available-for-sale, Unrealized Loss Position | 23.2 | 48.6
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 23.2 | 46.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0.0 | 2.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.1 | 0.1
US Government Sponsored Agencies [Member] |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0.2
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0.0
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 38.3
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 27.5
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 10.8
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0.2
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0.1 | 0.1
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0.0 | 0.1
Debt Securities, Available-for-sale, Unrealized Loss Position | 12.7 | 24.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 12.7 | 17.9
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 0.0 | 7.0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 0.1 | $ 0.0
Fair Value, Recurring [Member] | Debt Securities [Member] |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | $ 0.2 |

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121582814&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
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