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Investments - Contractual Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Amortized Cost    
Less: loaned securities $ 134,393 $ 139,121
Fixed-maturities available for sale, amortized cost 5,360,398 5,498,422
Fair Value    
Less: loaned securities 134,393 139,121
Total fixed-maturities available for sale, Fair Value 5,074,425 5,062,405
Non asset-backed securities    
Amortized Cost    
Due in one year or less 133,848  
Due after one year through five years [1] 1,020,087  
Due after five years through 10 years [1] 1,018,332  
Due after 10 years [1] 927,060  
Fair Value    
Due in one year or less 132,547  
Due after one year through five years [1] 1,000,206  
Due after five years through 10 years [1] 1,000,293  
Due after 10 years [1] 747,179  
Asset-backed and mortgage-backed securities    
Amortized Cost    
Asset-backed and mortgage-backed securities [2] 2,358,288  
Fair Value    
Asset-backed and mortgage-backed securities [2] 2,290,367  
Total fixed-maturities available for sale    
Amortized Cost    
Total 5,457,615 5,635,504
Fixed-maturities available for sale, amortized cost 5,360,398 5,498,422
Fair Value    
Total 5,170,592 5,192,257
Total fixed-maturities available for sale, Fair Value 5,074,425 5,062,405
Fixed-maturities available for sale | Total fixed-maturities available for sale    
Amortized Cost    
Total 5,457,615  
Fair Value    
Total 5,170,592  
Loaned securities, amortized cost | Total fixed-maturities available for sale    
Amortized Cost    
Less: loaned securities [3] 97,217 137,082
Fair Value    
Less: loaned securities [3] 97,217 137,082
Loaned securities, fair value | Total fixed-maturities available for sale    
Amortized Cost    
Less: loaned securities [3] 96,167 129,852
Fair Value    
Less: loaned securities [3] $ 96,167 $ 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.