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Investments - Schedule of Municipal Debt Securities and Corporate Debt Securities (Details)	Dec. 31, 2024	Dec. 31, 2023
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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