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Reinsurance (Schedule of Trust Assets and Reinsurance Liabilities) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Reinsurance [Line Items] |  |  |  |  |
Restricted cash and cash equivalents |  | $ 559.2 | $ 457.7 | $ 480.0 | $ 410.0
Debt Securities, Available-for-sale, Restricted |  | 99.9 | 93.2 |  |
Trust Assets [Member] |  |  |  |  |
Reinsurance [Line Items] |  |  |  |  |
Restricted cash and cash equivalents |  | 3.0 | 1.4 |  |
Debt Securities, Available-for-sale, Restricted |  | 99.9 | 93.2 |  |
Unearned Premium [Member] |  |  |  |  |
Reinsurance [Line Items] |  |  |  |  |
Accounts payable and accrued liabilities |  | 76.9 | 67.6 |  |
Claims Reserve [Member] |  |  |  |  |
Reinsurance [Line Items] |  |  |  |  |
Accounts payable and accrued liabilities | [1] | $ 5.6 | $ 5.6 |  |
[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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