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Investments - Summary of Contractual Maturities of Fixed Maturity Securities Available-For-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Amortized cost
Due one year or less	$ 264,671
Due after one year through five years	1,709,680
Due after five years through ten years	2,261,321
Due after ten years	471,074
Subtotal	4,706,746
Amortized cost	5,992,370	$ 5,876,502
Fair value
Due one year or less	263,849
Due after one year through five years	1,646,604
Due after five years through ten years	2,171,249
Due after ten years	465,758
Subtotal	4,547,460
Fair value	5,815,337	5,624,773
Residential mortgage-backed
Amortized cost
Residential mortgage-backed and other asset-backed, amortization	111,660
Amortized cost	111,660	8,394
Fair value
Residential mortgage-backed and other asset-backed, fair value	111,683
Fair value	111,683	8,364
Commercial mortgage-backed
Amortized cost
Residential mortgage-backed and other asset-backed, amortization	20,597
Amortized cost	20,597
Fair value
Residential mortgage-backed and other asset-backed, fair value	20,702
Fair value	20,702
Other asset-backed
Amortized cost
Residential mortgage-backed and other asset-backed, amortization	1,153,367
Amortized cost	1,153,367	1,214,928
Fair value
Residential mortgage-backed and other asset-backed, fair value	1,135,492
Fair value	$ 1,135,492	$ 1,189,465

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