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Comprehensive Income (Loss) - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning of period     $ 3,120,076  
OCI before reclassifications     169,415  
Amounts reclassified from AOCI     114  
Other comprehensive income (loss) $ 63,326 $ 180,846 169,529 $ 161,126
End of period 3,489,962 3,167,801 3,489,962 3,167,801
Total AOCI        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning of period (230,642) (392,721) (336,845) (373,001)
Other comprehensive income (loss) 63,326 180,846 169,529 161,126
End of period (167,316) (211,875) (167,316) (211,875)
Investments Subtotal        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning of period     (250,263)  
OCI before reclassifications     169,415  
Amounts reclassified from AOCI     (1,954)  
Other comprehensive income (loss) 62,636 180,082 167,461 158,834
End of period (82,802)   (82,802)  
Credit Loss Related        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning of period     (72,206)  
OCI before reclassifications 9,585 34,702 28,378 29,301
Amounts reclassified from AOCI (655) (1,732) (1,853) 1,336
Other comprehensive income (loss)     26,525  
End of period (45,681)   (45,681)  
All Other        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning of period     (178,057)  
OCI before reclassifications 53,248 148,098 141,037 129,211
Amounts reclassified from AOCI 458 (986) (101) (1,014)
Other comprehensive income (loss)     140,936  
End of period (37,121)   (37,121)  
Defined Benefit Pension and Post-Retirement Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning of period     (86,582)  
OCI before reclassifications     0  
Amounts reclassified from AOCI     2,068  
Other comprehensive income (loss) 690 $ 764 2,068 $ 2,292
End of period $ (84,514)   $ (84,514)