Investments - Schedule of Fixed Maturities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Amortized Cost, net
Due in one year or less	$ 121,194
Due after one year through five years	816,125
Due after five years through ten years	1,873,144
Due after ten years through twenty years	8,965,771
Due after twenty years	6,928,887
Mortgage-backed and asset-backed securities	112,046
Fixed maturities available for sale:	18,817,167
Fair Value
Due in one year or less	122,154
Due after one year through five years	847,246
Due after five years through ten years	1,938,627
Due after ten years through twenty years	8,521,420
Due after twenty years	6,046,084
Mortgage-backed and asset-backed securities	113,811
Fixed maturities available for sale:	$ 17,589,342	$ 17,155,012