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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, 2023 | Dec. 31, 2022
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Investments, Debt and Equity Securities [Abstract] |  |  |
Within one year, cost |  | $ 6.9 | $ 4.0
Over one year to five years, cost |  | 80.5 | 66.4
Over five years to ten years, cost |  | 7.1 | 5.6
Over ten years, cost |  | 0.1 | 0.1
Total restricted securities available for sale, cost |  | 94.6 | 76.1
Within one year, estimated fair value |  | 6.8 | 3.9
Over one year to five years, estimated fair value |  | 79.1 | 63.0
Over five years to ten years, estimated fair value |  | 7.2 | 5.3
Over ten years, fair value |  | 0.1 | 0.1
Debt Securities, Available-for-sale, Restricted | [1] | $ 93.2 | $ 72.3
[1] | Measured at fair value on a recurring basis.

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