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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 | Jun. 30, 2026 | Dec. 31, 2025
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Investments, Debt and Equity Securities [Abstract] |  |
Within one year, cost | $ 8.7 | $ 9.6
Over one year to five years, cost | 100.0 | 92.1
Over five years to ten years, cost | 8.2 | 3.3
Over ten years, cost | 0.0 | 0.0
Total restricted securities available for sale, cost | 116.9 | 105.0
Within one year, fair value | 8.7 | 9.6
Over one year to five years, fair value | 99.7 | 93.2
Over five years to ten years, fair value | 8.2 | 3.4
Over ten years, fair value | 0.0 | 0.0
Debt Securities, Available-for-sale, Restricted | $ 116.6 | $ 106.2

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