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Reinsurance (Cumulative Incurred Claims) (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 223,800,000 |  |  |  |
Claims Reserve | $ 5,600,000 |  |  |  |
Cumulative Number Of Reported Claims | 148,443 |  |  |  |
Incident Year - Four Years Prior [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 30,200,000 | $ 30,200,000 | $ 30,200,000 | $ 30,200,000 | $ 30,100,000
Claims Reserve | $ 0 |  |  |  |
Cumulative Number Of Reported Claims | 24,422 |  |  |  |
Incident Year - Three Years Prior [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 37,700,000 | 37,700,000 | 37,600,000 | $ 37,700,000 |
Claims Reserve | $ 0 |  |  |  |
Cumulative Number Of Reported Claims | 28,208 |  |  |  |
Incident Year - Two Years Prior [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 39,300,000 | 39,200,000 | $ 38,900,000 |  |
Claims Reserve | $ 0 |  |  |  |
Cumulative Number Of Reported Claims | 28,834 |  |  |  |
Incident Year - Prior Year [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 47,700,000 | $ 46,000,000.0 |  |  |
Claims Reserve | $ 0 |  |  |  |
Cumulative Number Of Reported Claims | 30,441 |  |  |  |
Incident Year - Current Year [Member] |  |  |  |  |
Cumulative Incurred Claims [Line Items] |  |  |  |  |
Cumulative Incurred Claims | $ 68,900,000 |  |  |  |
Claims Reserve | $ 5,600,000 |  |  |  |
Cumulative Number Of Reported Claims | 36,538 |  |  |  |

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