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Reinsurance (Cumulative Paid Claims) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | $ 218.2 |  |  |  |
Incident Year - Four Years Prior [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | 30.2 | $ 30.2 | $ 30.2 | $ 30.2 | $ 28.3
Incident Year - Three Years Prior [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | 37.7 | 37.7 | 37.6 | $ 35.4 |
Incident Year - Two Years Prior [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | 39.3 | 39.2 | $ 36.5 |  |
Incident Year - Prior Year [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | 47.7 | $ 42.9 |  |  |
Incident Year - Current Year [Member] |  |  |  |  |
Cumulative Paid Claims [Line Items] |  |  |  |  |
Cumulative Paid Claims | $ 63.3 |  |  |  |

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