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Restricted Securities Available for Sale (Schedule of Cost and Estimated Fair Values of Debt Securities by Contractual Maturity) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investments, Debt and Equity Securities [Abstract] |  |  |
Within one year, cost |  | $ 2.6 | $ 5.7
Within one year, fair value |  | 2.6 | 5.7
Over one year to five years, cost |  | 56.8 | 50.8
Over one year to five years, fair value |  | 58.8 | 51.8
Over five years to ten years, cost |  | 5.1 | 1.5
Over five years to ten years, fair value |  | 5.2 | 1.5
Over ten years, cost |  | 0.2 | 0.3
Over ten years, fair value |  | 0.2 | 0.3
Total restricted securities available for sale, cost |  | 64.7 | 58.3
Total restricted securities available for sale | [1] | $ 66.8 | $ 59.3
[1] | Measured at fair value on a recurring basis.

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