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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, 2021 | Dec. 31, 2020
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Investments, Debt and Equity Securities [Abstract] |  |  |
Within one year, cost |  | $ 2.9 | $ 1.1
Over one year to five years, cost |  | 56.9 | 58.1
Over five years to ten years, cost |  | 2.1 | 4.7
Over ten years, cost |  | 0.1 | 0.2
Total restricted securities available for sale, cost |  | 62.0 | 64.1
Within one year, estimated fair value |  | 3.0 | 1.1
Over one year to five years, estimated fair value |  | 57.0 | 60.0
Over five years to ten years, estimated fair value |  | 2.0 | 4.8
Over ten years, fair value |  | 0.1 | 0.2
Debt Securities, Available-for-sale, Restricted | [1] | $ 62.1 | $ 66.1
[1] | Measured at fair value on a recurring basis.

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