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Restricted Securities Available For Sale (Schedule Of Cost And Estimated Fair Values Of Debt Securities By Contractual Maturity) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Investments, Debt and Equity Securities [Abstract] |  |  |
Within one year, cost |  | $ 1.7 | $ 2.5
Over one year to five years, cost |  | 55.1 | 40.5
Over five years to ten years, cost |  | 0.8 | 1.0
Over ten years, cost |  | 1.4 | 2.4
Total restricted securities available for sale, cost |  | 59.0 | 46.4
Within one year, estimated fair value |  | 1.7 | 2.5
Over one year to five years, estimated fair value |  | 54.7 | 40.2
Over five years to ten years, estimated fair value |  | 0.8 | 1.0
Over ten years, fair value |  | 1.4 | 2.4
Total restricted securities available for sale, estimated fair value | [1] | $ 58.6 | $ 46.1
[1] | Measured at fair value on a recurring basis.

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