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Fair Value Measurements - Schedule of Quantitative Information about Significant Unobservable Inputs in the Fair Value Measurement of Level 3 Assets (Details) $ in Thousands | Mar. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investment assets measured at fair value | $ 283,366 | $ 222,447 |  |
Total Level 3 securities | 662,511 | 619,247 |  |
Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Level 3 securities | 240,917 | 242,679 | $ 287,496 | $ 297,332
CLO and other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Level 3 securities | 412,802 | 367,994 | $ 260,097 | $ 245,313
Valuation Technique, Discounted Cash Flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets measured at fair value | 379,145 | 396,800 |  |
Valuation Technique, Discounted Cash Flow | Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets measured at fair value | 147,340 | 147,294 |  |
Valuation Technique, Discounted Cash Flow | CLO and other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets measured at fair value | $ 231,805 | $ 249,506 |  |
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Minimum | Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, available-for-sale, measurement input | (0.044) | (0.044) |  |
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Minimum | CLO and other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, available-for-sale, measurement input | (0.0097) | (0.0097) |  |
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Maximum | Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, available-for-sale, measurement input | 0.053 | 0.053 |  |
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Maximum | CLO and other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, available-for-sale, measurement input | 0.196 | 0.196 |  |
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Weighted Average | Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, available-for-sale, measurement input | 0.018 | 0.017 |  |
Valuation Technique, Discounted Cash Flow | Illiquidity Spread | Weighted Average | CLO and other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Debt securities, available-for-sale, measurement input | 0.022 | 0.019 |  |

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