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Restricted Securities Available for Sale (Schedule of Restricted Securities Available for Sale) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | $ 68.2 | $ 64.1
Gross Unrealized Gains |  | 1.2 | 2.0
Gross Unrealized Losses |  | (0.1) | 0.0
Estimated Fair Value | [1] | 69.3 | 66.1
Corporate Bond Securities [Member] |  |  |
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 33.1 | 31.3
Gross Unrealized Gains |  | 0.7 | 1.1
Gross Unrealized Losses |  | (0.1) | 0.0
Estimated Fair Value |  | 33.7 | 32.4
US Government and Agency Securities [Member] |  |  |
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 22.3 | 19.7
Gross Unrealized Gains |  | 0.4 | 0.7
Gross Unrealized Losses |  | 0.0 | 0.0
Estimated Fair Value |  | 22.7 | 20.4
Asset-backed Securities [Member] |  |  |
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 12.4 | 12.7
Gross Unrealized Gains |  | 0.1 | 0.2
Gross Unrealized Losses |  | 0.0 |
Estimated Fair Value |  | 12.5 | 12.9
Mortgage-backed Securities [Member] |  |  |
Restricted Securities Available For Sale [Line Items] |  |  |
Available-for-sale Securities, Amortized Cost Basis |  | 0.4 | 0.4
Gross Unrealized Gains |  | 0.0 | 0.0
Gross Unrealized Losses |  | 0.0 | 0.0
Estimated Fair Value |  | $ 0.4 | $ 0.4
[1] | Measured at fair value on a recurring basis.

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