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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | $ 67.0 | $ 64.1
Gross Unrealized Gains |  | 1.3 | 2.0
Gross Unrealized Losses |  | (0.2) | 0.0
Estimated Fair Value | [1] | 68.1 | 66.1
Corporate Bond Securities [Member] |  |  |
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 34.8 | 31.3
Gross Unrealized Gains |  | 0.7 | 1.1
Gross Unrealized Losses |  | (0.2) | 0.0
Estimated Fair Value |  | 35.3 | 32.4
US Government and Agency Securities [Member] |  |  |
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 19.2 | 19.7
Gross Unrealized Gains |  | 0.5 | 0.7
Gross Unrealized Losses |  | 0.0 | 0.0
Estimated Fair Value |  | 19.7 | 20.4
Asset-backed Securities [Member] |  |  |
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 12.6 | 12.7
Gross Unrealized Gains |  | 0.1 | 0.2
Gross Unrealized Losses |  | 0.0 |
Estimated Fair Value |  | 12.7 | 12.9
Mortgage-backed Securities [Member] |  |  |
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 0.4 | 0.4
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | 0.0 | 0.0
Estimated Fair Value |  | $ 0.4 | $ 0.4
[1] | Measured at fair value on a recurring basis.

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as 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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