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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 | Mar. 31, 2024 | Dec. 31, 2023
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Investments, Debt and Equity Securities [Abstract] |  |
Within one year, cost | $ 4.8 | $ 6.9
Over one year to five years, cost | 87.6 | 80.5
Over five years to ten years, cost | 9.0 | 7.1
Over ten years, cost | 0.1 | 0.1
Total restricted securities available for sale, cost | 101.5 | 94.6
Within one year, fair value | 4.7 | 6.8
Over one year to five years, fair value | 86.1 | 79.1
Over five years to ten years, fair value | 9.0 | 7.2
Over ten years, fair value | 0.1 | 0.1
Debt Securities, Available-for-sale, Restricted | $ 99.9 | $ 93.2

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