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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 | Jun. 30, 2021 | Dec. 31, 2020
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Investments, Debt and Equity Securities [Abstract] |  |  |
Within one year, cost |  | $ 3.7 | $ 1.1
Within one year, fair value |  | 3.7 | 1.1
Over one year to five years, cost |  | 62.2 | 58.1
Over one year to five years, fair value |  | 63.3 | 60.0
Over five years to ten years, cost |  | 2.1 | 4.7
Over five years to ten years, fair value |  | 2.1 | 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 |  | 68.2 | 64.1
Total restricted securities available for sale | [1] | $ 69.3 | $ 66.1
[1] | Measured at fair value on a recurring basis.

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27198-111563 + Details
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