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Comprehensive Income (Loss) - Schedule of Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning of period $ 3,120,076  
OCI before reclassifications 64,801  
Amounts reclassified from AOCI (24)  
Other comprehensive income (loss) 64,777 $ (11,971)
End of period 3,258,540 3,006,494
Total AOCI    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning of period (336,845) (373,001)
Other comprehensive income (loss) 64,777 (11,971)
End of period (272,068) $ (384,972)
Investments Subtotal    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning of period (250,263)  
OCI before reclassifications 64,801  
Amounts reclassified from AOCI (713)  
Other comprehensive income (loss) 64,088  
End of period (186,175)  
Credit Loss Related    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning of period (72,206)  
OCI before reclassifications 10,086  
Amounts reclassified from AOCI (497)  
Other comprehensive income (loss) 9,589  
End of period (62,617)  
All Other    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning of period (178,057)  
OCI before reclassifications 54,715  
Amounts reclassified from AOCI (216)  
Other comprehensive income (loss) 54,499  
End of period (123,558)  
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 689  
Other comprehensive income (loss) 689  
End of period $ (85,893)