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Investments - Schedule of Municipal Debt Securities and Corporate Debt Securities (Details) | Dec. 31, 2022 | Dec. 31, 2021
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Municipal debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 100.00% | 100.00%
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 100.00% | 100.00%
Special revenue bonds | Municipal debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 79.00% | 77.10%
General obligation bonds | Municipal debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 20.90% | 20.50%
Certificate of participation bonds | Municipal debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 0.00% | 1.90%
Tax allocation bonds | Municipal debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 0.10% | 0.50%
Financial | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 40.50% | 33.70%
Consumer, non-cyclical | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 17.90% | 19.80%
Communications | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 8.40% | 11.40%
Consumer, cyclical | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 6.80% | 7.00%
Industrial | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 6.80% | 7.00%
Energy | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 6.40% | 6.00%
Utilities | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 6.10% | 4.60%
Technology | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 4.90% | 6.80%
Basic Materials | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 2.10% | 3.70%
Government | Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of debt securities | 0.10% | 0.00%

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