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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale by Aging Category) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
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Restricted Securities Available For Sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | $ 22.8 | $ 2.2
Gross Unrealized Losses, Less than 12 Months | (0.2) | 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 | 22.8 | 2.2
Total Gross Unrealized Losses | (0.2) | 0.0
Corporate Bond Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 16.7 | 2.2
Gross Unrealized Losses, Less than 12 Months | (0.2) | 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 | 16.7 | 2.2
Total Gross Unrealized Losses | (0.2) | 0.0
US Government and Agency Securities [Member] |  |
Restricted Securities Available For Sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 3.4 | 0.0
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 | 3.4 | 0.0
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 | 2.7 | 0.0
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 | 2.7 | 0.0
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 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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