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Investments - Schedule of Municipal Debt Securities and Corporate Debt Securities (Details) | Dec. 31, 2024 | Dec. 31, 2023
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Municipal debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 100.00% | 100.00%
Municipal debt securities | Special revenue bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 83.30% | 81.40%
Municipal debt securities | General obligation bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 16.70% | 18.60%
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 100.00% | 100.00%
Corporate debt securities | Financial |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 41.80% | 42.00%
Corporate debt securities | Consumer, Non-Cyclical |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 15.10% | 15.90%
Corporate debt securities | Industrial |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 8.20% | 8.10%
Corporate debt securities | Communications |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 5.70% | 7.20%
Corporate debt securities | Consumer, Cyclical |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 6.30% | 7.10%
Corporate debt securities | Utilities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 8.70% | 6.30%
Corporate debt securities | Technology |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 6.40% | 6.20%
Corporate debt securities | Energy |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 5.10% | 4.70%
Corporate debt securities | Basic Materials |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 2.70% | 2.50%

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