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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, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | $ 18.9 | $ 28.2
Gross Unrealized Losses, Less than 12 Months | (0.1) | (0.2)
Estimated Fair Value,12 Months or More | 21.7 | 12.0
Gross Unrealized Losses, 12 Months or More | (0.4) | (0.1)
Total Estimated Fair Value | 40.6 | 40.2
Total Gross Unrealized Losses | (0.5) | (0.3)
US Government and agency securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 2.2 | 11.0
Gross Unrealized Losses, Less than 12 Months | 0.0 | (0.1)
Estimated Fair Value,12 Months or More | 10.5 | 7.9
Gross Unrealized Losses, 12 Months or More | (0.2) | (0.1)
Total Estimated Fair Value | 12.7 | 18.9
Total Gross Unrealized Losses | (0.2) | (0.2)
Corporate bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 12.0 | 11.1
Gross Unrealized Losses, Less than 12 Months | (0.1) | (0.1)
Estimated Fair Value,12 Months or More | 6.5 | 1.9
Gross Unrealized Losses, 12 Months or More | (0.1) | 0.0
Total Estimated Fair Value | 18.5 | 13.0
Total Gross Unrealized Losses | (0.2) | (0.1)
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 4.7 | 4.9
Gross Unrealized Losses, Less than 12 Months | 0.0 | 0.0
Estimated Fair Value,12 Months or More | 3.3 | 1.0
Gross Unrealized Losses, 12 Months or More | (0.1) | 0.0
Total Estimated Fair Value | 8.0 | 5.9
Total Gross Unrealized Losses | (0.1) | 0.0
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 0.0 | 1.2
Gross Unrealized Losses, Less than 12 Months | 0.0 | 0.0
Estimated Fair Value,12 Months or More | 1.4 | 1.2
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 1.4 | 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 No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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