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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, 2019 | Dec. 31, 2018
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Investments, Debt and Equity Securities [Abstract] |  |  |
Within one year, cost |  | $ 5.7 | $ 1.7
Over one year to five years, cost |  | 50.8 | 55.1
Over five years to ten years, cost |  | 1.5 | 0.8
Over ten years, cost |  | 0.3 | 1.4
Total restricted securities available for sale, cost |  | 58.3 | 59.0
Within one year, estimated fair value |  | 5.7 | 1.7
Over one year to five years, estimated fair value |  | 51.8 | 54.7
Over five years to ten years, estimated fair value |  | 1.5 | 0.8
Over ten years, fair value |  | 0.3 | 1.4
Total restricted securities available for sale, estimated fair value | [1] | $ 59.3 | $ 58.6
[1] | Measured at fair value on a recurring basis.

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