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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | $ 52.0 | $ 46.4
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | (0.7) | (0.3)
Estimated Fair Value | [1] | 51.3 | 46.1
US Government and Agency Securities [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 21.3 | 19.2
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | (0.3) | (0.2)
Estimated Fair Value |  | 21.0 | 19.0
Corporate Bond Securities [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 20.5 | 18.2
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | (0.3) | (0.1)
Estimated Fair Value |  | 20.2 | 18.1
Asset-backed Securities [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 8.0 | 6.6
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | (0.1) |
Estimated Fair Value |  | 7.9 | 6.6
Mortgage-backed Securities [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 2.2 | 2.4
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | 0.0 | 0.0
Estimated Fair Value |  | $ 2.2 | $ 2.4
[1] | Measured and recorded 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://www.xbrl.org/2003/role/presentationRef -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 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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