Investments - Contractual Maturities (Details) - USD ($) $ in Thousands		Jun. 30, 2025		Dec. 31, 2024
Amortized Cost
Less: loaned securities		$ 179,692		$ 139,121
Fixed-maturities available for sale, amortized cost		5,449,992		5,511,501
Fair Value
Less: loaned securities		179,692		139,121
Total fixed-maturities available for sale, Fair Value		5,108,278		5,074,920
Non asset-backed securities
Amortized Cost
Due in one year or less		148,535
Due after one year through five years	[1]	1,019,664
Due after five years through 10 years	[1]	1,021,904
Due after 10 years	[1]	902,030
Fair Value
Due in one year or less		146,434
Due after one year through five years	[1]	995,687
Due after five years through 10 years	[1]	986,687
Due after 10 years	[1]	705,020
Asset-backed and mortgage-backed securities
Amortized Cost
Asset-backed and mortgage-backed securities	[2]	2,492,298
Fair Value
Asset-backed and mortgage-backed securities	[2]	2,404,577
Total fixed-maturities available for sale
Amortized Cost
Total		5,584,431		5,648,583
Fixed-maturities available for sale, amortized cost		5,449,992		5,511,501	[3]
Fair Value
Total		5,238,405		5,204,772
Total fixed-maturities available for sale, Fair Value		5,108,278		5,074,920	[3]
Fixed-maturities available for sale | Total fixed-maturities available for sale
Amortized Cost
Total		5,584,431
Fair Value
Total		5,238,405
Loaned securities, amortized cost | Total fixed-maturities available for sale
Amortized Cost
Less: loaned securities		134,439	[3]	137,082
Fair Value
Less: loaned securities		134,439	[3]	137,082
Loaned securities, fair value | Total fixed-maturities available for sale
Amortized Cost
Less: loaned securities		130,127	[3]	129,852
Fair Value
Less: loaned securities		$ 130,127	[3]	$ 129,852

[1] Actual maturities may differ as a result of calls before scheduled maturity.

[2] Includes RMBS, CMBS, CLO, Other ABS and mortgage insurance-linked notes, which are not due at a single maturity date.

[3] Included in other assets on our condensed consolidated balance sheets. See “Loaned Securities” below for a discussion of our securities lending agreements.