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Reinsurance (Schedule of Trust Assets and Reinsurance Liabilities) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Reinsurance [Line Items] |  |  |  |  |
Restricted cash and cash equivalents |  | $ 391.9 | $ 330.3 | $ 329.8 | $ 303.6
Restricted securities available for sale | [1] | 66.8 | 59.3 |  |
Trust Assets [Member] |  |  |  |  |
Reinsurance [Line Items] |  |  |  |  |
Restricted cash and cash equivalents |  | 1.0 | 0.9 |  |
Restricted securities available for sale |  | 66.8 | 59.3 |  |
Unearned Premium [Member] |  |  |  |  |
Reinsurance [Line Items] |  |  |  |  |
Accounts payable and accrued liabilities |  | 51.2 | 44.1 |  |
Claims Reserve [Member] |  |  |  |  |
Reinsurance [Line Items] |  |  |  |  |
Accounts payable and accrued liabilities | [2] | $ 2.6 | $ 1.8 |  |
[1] | Measured at fair value on a recurring basis.
[2] | The claims reserve represents our liability for incurred-but-not-reported claims and is estimated based on historical claims experience.

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