Investments - Schedule of Investment Funds (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Alternative Investment [Line Items]
Investment funds, unfunded commitments	$ 558,000
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	$ 614,080	$ 566,142
Investment funds, unfunded commitments	260,229
Opportunistic and private credit
Alternative Investment [Line Items]
Investment funds, fair value	223,665	202,008
Investment funds, unfunded commitments	222,080
Infrastructure
Alternative Investment [Line Items]
Investment funds, fair value	187,964	179,627
Investment funds, unfunded commitments	21,791
Other
Alternative Investment [Line Items]
Investment funds, fair value	84,010	38,989
Investment funds, unfunded commitments	53,665
Investment funds
Alternative Investment [Line Items]
Investment funds, fair value	1,109,719	$ 986,766
Investment funds, unfunded commitments	557,765
Unfunded commitments, including past investment period	$ 716,000