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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 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investments, Debt and Equity Securities [Abstract] |  |  |
Within one year, cost |  | $ 6.8 | $ 1.1
Within one year, fair value |  | 6.8 | 1.1
Over one year to five years, cost |  | 58.3 | 58.1
Over one year to five years, fair value |  | 59.4 | 60.0
Over five years to ten years, cost |  | 1.7 | 4.7
Over five years to ten years, fair value |  | 1.7 | 4.8
Over ten years, cost |  | 0.2 | 0.2
Over ten years, fair value |  | 0.2 | 0.2
Total restricted securities available for sale, cost |  | 67.0 | 64.1
Total restricted securities available for sale | [1] | $ 68.1 | $ 66.1
[1] | Measured at fair value on a recurring basis.

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