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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, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | $ 5.2 | $ 18.9
Gross Unrealized Losses, Less than 12 Months | 0.0 | (0.1)
Estimated Fair Value,12 Months or More | 0.0 | 21.7
Gross Unrealized Losses, 12 Months or More | 0.0 | (0.4)
Total Estimated Fair Value | 5.2 | 40.6
Total Gross Unrealized Losses | 0.0 | (0.5)
Corporate bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 1.4 | 12.0
Gross Unrealized Losses, Less than 12 Months | 0.0 | (0.1)
Estimated Fair Value,12 Months or More | 0.0 | 6.5
Gross Unrealized Losses, 12 Months or More | 0.0 | (0.1)
Total Estimated Fair Value | 1.4 | 18.5
Total Gross Unrealized Losses | 0.0 | (0.2)
US Government and agency securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 1.9 | 2.2
Gross Unrealized Losses, Less than 12 Months | 0.0 | 0.0
Estimated Fair Value,12 Months or More | 0.0 | 10.5
Gross Unrealized Losses, 12 Months or More | 0.0 | (0.2)
Total Estimated Fair Value | 1.9 | 12.7
Total Gross Unrealized Losses | 0.0 | (0.2)
Asset-backed Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 1.9 | 4.7
Gross Unrealized Losses, Less than 12 Months | 0.0 | 0.0
Estimated Fair Value,12 Months or More | 0.0 | 3.3
Gross Unrealized Losses, 12 Months or More | 0.0 | (0.1)
Total Estimated Fair Value | 1.9 | 8.0
Total Gross Unrealized Losses | 0.0 | (0.1)
Mortgage-backed securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Estimated Fair Value, Less than 12 Months | 0.0 | 0.0
Gross Unrealized Losses, Less than 12 Months | 0.0 | 0.0
Estimated Fair Value,12 Months or More | 0.0 | 1.4
Gross Unrealized Losses, 12 Months or More | 0.0 | 0.0
Total Estimated Fair Value | 0.0 | 1.4
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=118939692&loc=d3e27337-111563 + Details
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