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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | $ 61.7 | $ 59.0
Gross Unrealized Gains |  | 0.5 | 0.1
Gross Unrealized Losses |  | (0.2) | (0.5)
Estimated Fair Value | [1] | 62.0 | 58.6
Corporate Bond Securities [Member] |  |  |
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 24.3 | 23.4
Gross Unrealized Gains |  | 0.3 | 0.0
Gross Unrealized Losses |  | (0.1) | (0.2)
Estimated Fair Value |  | 24.5 | 23.2
US Government and Agency Securities [Member] |  |  |
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 25.0 | 24.8
Gross Unrealized Gains |  | 0.2 | 0.1
Gross Unrealized Losses |  | (0.1) | (0.2)
Estimated Fair Value |  | 25.1 | 24.7
Asset-backed Securities [Member] |  |  |
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 11.5 | 9.4
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | 0.0 | (0.1)
Estimated Fair Value |  | 11.5 | 9.3
Mortgage-backed Securities [Member] |  |  |
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 0.9 | 1.4
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | 0.0 | 0.0
Estimated Fair Value |  | $ 0.9 | $ 1.4
[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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