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Restricted Securities Available For Sale (Restricted Securities Available For Sale) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost |  | $ 64.1 | $ 58.3
Gross Unrealized Gains |  | 2.0 | 1.0
Gross Unrealized Losses |  | 0.0 | 0.0
Total restricted securities available for sale | [1] | 66.1 | 59.3
Corporate bonds [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost |  | 31.3 | 25.3
Gross Unrealized Gains |  | 1.1 | 0.5
Gross Unrealized Losses |  | 0.0 | 0.0
Total restricted securities available for sale |  | 32.4 | 25.8
US Government and agency securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost |  | 19.7 | 21.3
Gross Unrealized Gains |  | 0.7 | 0.4
Gross Unrealized Losses |  | 0.0 | 0.0
Total restricted securities available for sale |  | 20.4 | 21.7
Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost |  | 12.7 | 11.2
Gross Unrealized Gains |  | 0.2 | 0.1
Gross Unrealized Losses |  | 0.0 | 0.0
Total restricted securities available for sale |  | 12.9 | 11.3
Mortgage-backed securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost |  | 0.4 | 0.5
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | 0.0 | 0.0
Total restricted securities available for sale |  | $ 0.4 | $ 0.5
[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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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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