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Investments - Schedule of Investment Funds (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Alternative Investment [Line Items] |  |
Investment funds, unfunded commitments | $ 471,000 |
Minimum |  |
Alternative Investment [Line Items] |  |
Expected life of non-redeemable funds | 7 years |
Extension options term of non-redeemable funds | 1 year |
Expected life of redeemable funds | 6 months |
Maximum |  |
Alternative Investment [Line Items] |  |
Expected life of non-redeemable funds | 12 years |
Extension options term of non-redeemable funds | 4 years |
Expected life of redeemable funds | 36 months |
Commercial mortgage loans |  |
Alternative Investment [Line Items] |  |
Investment funds, Fair Value | $ 547,663 | $ 566,142
Investment funds, unfunded commitments | 190,366 |
Opportunistic and private credit |  |
Alternative Investment [Line Items] |  |
Investment funds, Fair Value | 216,659 | 202,008
Investment funds, unfunded commitments | 204,013 |
Infrastructure |  |
Alternative Investment [Line Items] |  |
Investment funds, Fair Value | 188,605 | 179,627
Investment funds, unfunded commitments | 21,662 |
Other |  |
Alternative Investment [Line Items] |  |
Investment funds, Fair Value | 84,520 | 38,989
Investment funds, unfunded commitments | 54,793 |
Investment funds |  |
Alternative Investment [Line Items] |  |
Investment funds, Fair Value | 1,037,447 | $ 986,766
Investment funds, unfunded commitments | 470,834 |
Unfunded commitments, including past investment period | $ 628,000 |

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