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Restricted Securities Available For Sale (Restricted Securities Available For Sale) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Cost |  | $ 46.4 | $ 45.5
Gross Unrealized Gains |  | 0.0 | 0.1
Gross Unrealized Losses |  | 0.3 | 0.3
Total restricted securities available for sale | [1] | 46.1 | 45.3
US Government And Agency Securities [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Cost |  | 19.2 | 20.4
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | 0.2 | 0.1
Total restricted securities available for sale |  | 19.0 | 20.3
Corporate bonds [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Cost |  | 18.2 | 16.9
Gross Unrealized Gains |  | 0.0 | 0.1
Gross Unrealized Losses |  | 0.1 | 0.2
Total restricted securities available for sale |  | 18.1 | 16.8
Asset-backed Securities [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Cost |  | 6.6 | 5.0
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | 0.0 | 0.0
Total restricted securities available for sale |  | 6.6 | 5.0
Mortgage-backed securities [Member] |  |  |
Restricted Cash and Cash Equivalents Items [Line Items] |  |  |
Cost |  | 2.4 | 3.2
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | 0.0 | 0.0
Total restricted securities available for sale |  | $ 2.4 | $ 3.2
[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://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 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -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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