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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 | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other investment assets measured at fair value | $ 213,042 | $ 288,955 |  |
Total Level 3 securities | 566,725 | 551,689 |  |
Corporate securities |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Level 3 securities | 249,539 | 297,332 | $ 260,479 | $ 187,980
CLO and other ABS |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total Level 3 securities | 308,218 | 245,313 | $ 210,407 | $ 153,342
Valuation Technique, Discounted Cash Flow |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Total assets measured at fair value | 353,683 | 262,734 |  |
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 | 154,935 | 135,524 |  |
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 | $ 198,748 | $ 127,210 |  |
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) | 0.0001 |  |
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 | 0.017 | 0.019 |  |
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 | 0.023 | 0.024 |  |

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