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Restricted Securities Available For Sale (Restricted Securities Available For Sale) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost |  | $ 59.0 | $ 46.4
Gross Unrealized Gains |  | 0.1 | 0.0
Gross Unrealized Losses |  | 0.5 | 0.3
Total restricted securities available for sale | [1] | 58.6 | 46.1
US Government and agency securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost |  | 24.8 | 19.2
Gross Unrealized Gains |  | 0.1 | 0.0
Gross Unrealized Losses |  | 0.2 | 0.2
Total restricted securities available for sale |  | 24.7 | 19.0
Corporate bonds [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost |  | 23.4 | 18.2
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | 0.2 | 0.1
Total restricted securities available for sale |  | 23.2 | 18.1
Asset-backed Securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost |  | 9.4 | 6.6
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | 0.1 | 0.0
Total restricted securities available for sale |  | 9.3 | 6.6
Mortgage-backed securities [Member] |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Cost |  | 1.4 | 2.4
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | 0.0 | 0.0
Total restricted securities available for sale |  | $ 1.4 | $ 2.4
[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=82897076&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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