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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, 2019 | Dec. 31, 2018
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Investments, Debt and Equity Securities [Abstract] |  |  |
Within one year, cost |  | $ 4.8 | $ 1.7
Within one year, fair value |  | 4.8 | 1.7
Over one year to five years, cost |  | 53.1 | 55.1
Over one year to five years, fair value |  | 54.1 | 54.7
Over five years to ten years, cost |  | 2.1 | 0.8
Over five years to ten years, fair value |  | 2.1 | 0.8
Over ten years, cost |  | 0.5 | 1.4
Over ten years, fair value |  | 0.5 | 1.4
Total restricted securities available for sale, cost |  | 60.5 | 59.0
Total restricted securities available for sale | [1] | $ 61.5 | $ 58.6
[1] | Measured at fair value on a recurring basis.

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