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Reinsurance (Schedule of Trust Assets and Reinsurance Liabilities) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Reinsurance [Line Items] |  |  |  |  |
Restricted cash and cash equivalents |  | $ 481.1 | $ 410.9 | $ 538.5 | $ 380.2
Debt Securities, Available-for-sale, Restricted |  | 62.4 | 62.1 |  |
Trust Assets [Member] |  |  |  |  |
Reinsurance [Line Items] |  |  |  |  |
Restricted cash and cash equivalents |  | 1.1 | 0.3 |  |
Debt Securities, Available-for-sale, Restricted |  | 62.4 | 62.1 |  |
Unearned Premium [Member] |  |  |  |  |
Reinsurance [Line Items] |  |  |  |  |
Accounts payable and accrued liabilities |  | 48.5 | 44.6 |  |
Claims Reserve [Member] |  |  |  |  |
Reinsurance [Line Items] |  |  |  |  |
Accounts payable and accrued liabilities | [1] | $ 2.3 | $ 2.4 |  |
[1] | The claims reserve represents our liability for incurred-but-not-reported claims and is estimated based on historical claims experience.

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