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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale by Aging Category) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Restricted Securities Available For Sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | $ 4.7 | $ 5.2
Gross Unrealized Losses, Less than 12 Months | 0.0 | 0.0
Estimated Fair Value, 12 Months or More | 0.0 | 0.0
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 4.7 | 5.2
Total Gross Unrealized Losses | 0.0 | 0.0
Corporate Bond Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 4.2 | 1.4
Gross Unrealized Losses, Less than 12 Months | 0.0 | 0.0
Estimated Fair Value, 12 Months or More | 0.0 | 0.0
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 4.2 | 1.4
Total Gross Unrealized Losses | 0.0 | 0.0
US Government and Agency Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 0.0 | 1.9
Gross Unrealized Losses, Less than 12 Months | 0.0 | 0.0
Estimated Fair Value, 12 Months or More | 0.0 | 0.0
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 0.0 | 1.9
Total Gross Unrealized Losses | 0.0 | 0.0
Asset-backed Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 0.5 | 1.9
Gross Unrealized Losses, Less than 12 Months | 0.0 |
Estimated Fair Value, 12 Months or More | 0.0 | 0.0
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 0.5 | 1.9
Mortgage-backed Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 0.0 | 0.0
Estimated Fair Value, 12 Months or More | 0.0 | 0.0
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | $ 0.0 | $ 0.0

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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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