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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 | Sep. 30, 2023 | Dec. 31, 2022
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Investments, Debt and Equity Securities [Abstract] |  |
Within one year, cost | $ 7.9 | $ 4.0
Over one year to five years, cost | 74.4 | 66.4
Over five years to ten years, cost | 7.7 | 5.6
Over ten years, cost | 0.0 | 0.1
Total restricted securities available for sale, cost | 90.0 | 76.1
Within one year, fair value | 7.7 | 3.9
Over one year to five years, fair value | 71.0 | 63.0
Over five years to ten years, fair value | 7.5 | 5.3
Over ten years, fair value | 0.0 | 0.1
Debt Securities, Available-for-sale, Restricted | $ 86.2 | $ 72.3

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