Investments - Schedule of Changes in Assets Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - Significant Unobservable Inputs (Level 3) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Beginning Balance	$ 474,114	$ 496,879	$ 528,447
Included in realized gains / losses	$ (3,151)	$ 740	$ 0
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Realized gains (losses)	Realized gains (losses)	Realized gains (losses)
Included in other comprehensive income	$ 5,025	$ (3,663)	$ (3,689)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]	Attributable to Parent Company	Attributable to Parent Company	Attributable to Parent Company
Acquisitions	$ 118,383	$ 23,748	$ 0
Sales	(154,777)	0	0
Amortization	1,303	4,765	4,724
Other	(45,672)	(50,553)	(32,603)
Transfers into Level 3	0	2,198	0
Transfers out of Level 3	0	0	0
Ending Balance	395,225	474,114	496,879
Asset- backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Beginning Balance	11,183	0	0
Included in realized gains / losses	0	0	0
Included in other comprehensive income	350	37	0
Acquisitions	74,368	8,948	0
Sales	0	0	0
Amortization	0	0	0
Other	0	0	0
Transfers into Level 3	0	2,198	0
Transfers out of Level 3	0	0	0
Ending Balance	85,901	11,183	0
Collateralized debt obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Beginning Balance	42,866	42,146	50,364
Included in realized gains / losses	(588)	0	0
Included in other comprehensive income	(5,943)	907	(8,230)
Acquisitions	0	0	0
Sales	(36,398)	0	0
Amortization	1,512	4,548	4,569
Other	(1,449)	(4,735)	(4,557)
Transfers into Level 3	0	0	0
Transfers out of Level 3	0	0	0
Ending Balance	0	42,866	42,146
Corporates
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation
Beginning Balance	420,065	454,733	478,083
Included in realized gains / losses	(2,563)	740	0
Included in other comprehensive income	10,618	(4,607)	4,541
Acquisitions	44,015	14,800	0
Sales	(118,379)	0	0
Amortization	(209)	217	155
Other	(44,223)	(45,818)	(28,046)
Transfers into Level 3	0	0	0
Transfers out of Level 3	0	0	0
Ending Balance	$ 309,324	$ 420,065	$ 454,733