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Restricted Securities Available For Sale (Schedule Of Restricted Securities Available For Sale By Aging Category) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | $ 28.2 | $ 33.4
Gross Unrealized Losses, Less than 12 Months | (0.2) | (0.3)
Estimated Fair Value,12 Months or More | 12.0 | 0.0
Gross Unrealized Losses, 12 Months or More | (0.1) | 0.0
Total Estimated Fair Value | 40.2 | 33.4
Total Gross Unrealized Losses | (0.3) | (0.3)
US Government and agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 11.0 | 16.4
Gross Unrealized Losses, Less than 12 Months | (0.1) | (0.1)
Estimated Fair Value,12 Months or More | 7.9 | 0.0
Gross Unrealized Losses, 12 Months or More | (0.1) | 0.0
Total Estimated Fair Value | 18.9 | 16.4
Total Gross Unrealized Losses | (0.2) | (0.1)
Corporate bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 11.1 | 11.8
Gross Unrealized Losses, Less than 12 Months | (0.1) | (0.2)
Estimated Fair Value,12 Months or More | 1.9 | 0.0
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 13.0 | 11.8
Total Gross Unrealized Losses | (0.1) | (0.2)
Asset-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 4.9 | 2.8
Gross Unrealized Losses, Less than 12 Months | 0.0 | 0.0
Estimated Fair Value,12 Months or More | 1.0 | 0.0
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 5.9 | 2.8
Total Gross Unrealized Losses | 0.0 | 0.0
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 1.2 | 2.4
Gross Unrealized Losses, Less than 12 Months | 0.0 | 0.0
Estimated Fair Value,12 Months or More | 1.2 | 0.0
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 2.4 | 2.4
Total Gross Unrealized Losses | $ 0.0 | $ 0.0

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
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