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INVESTMENTS - Fixed Maturities Available for Sale (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024
Available for sale
Amortized cost	$ 13,916,563		$ 12,937,728
Allowance for expected credit losses	(1,898)	$ (3,119)	(1,836)	$ (5,043)	$ (4,183)	$ (3,938)
Gross unrealized gains	71,366		180,873
Gross unrealized losses	(157,717)		(98,738)
Fair value	13,828,314		13,018,027
U.S. government and agency
Available for sale
Amortized cost	2,403,693		2,406,907
Allowance for expected credit losses	0		0
Gross unrealized gains	2,762		17,206
Gross unrealized losses	(19,081)		(6,212)
Fair value	2,387,374		2,417,901
Non-U.S. government
Available for sale
Amortized cost	830,184		798,984
Allowance for expected credit losses	(26)		0
Gross unrealized gains	4,875		14,961
Gross unrealized losses	(11,123)		(3,401)
Fair value	823,910		810,544
Corporate debt
Available for sale
Amortized cost	5,603,202		5,168,562
Allowance for expected credit losses	(1,211)		(1,539)
Gross unrealized gains	43,724		96,137
Gross unrealized losses	(60,816)		(40,727)
Fair value	5,584,899		5,222,433
Agency RMBS
Available for sale
Amortized cost	2,445,926		2,026,043
Allowance for expected credit losses	0		0
Gross unrealized gains	12,350		31,869
Gross unrealized losses	(35,327)		(22,560)
Fair value	2,422,949		2,035,352
CMBS
Available for sale
Amortized cost	804,486		811,056
Allowance for expected credit losses	(326)		0
Gross unrealized gains	2,104		6,641
Gross unrealized losses	(17,916)		(16,186)
Fair value	788,348		801,511
Non-agency RMBS
Available for sale
Amortized cost	212,897		193,372
Allowance for expected credit losses	(258)		(240)
Gross unrealized gains	617		1,366
Gross unrealized losses	(5,217)		(4,374)
Fair value	208,039		190,124
ABS
Available for sale
Amortized cost	1,569,414		1,479,963
Allowance for expected credit losses	(77)		(57)
Gross unrealized gains	4,768		12,231
Gross unrealized losses	(6,846)		(4,070)
Fair value	1,567,259		1,488,067
Municipals
Available for sale
Amortized cost	46,761		52,841
Allowance for expected credit losses	0		0
Gross unrealized gains	166		462
Gross unrealized losses	(1,391)		(1,208)
Fair value	$ 45,536		$ 52,095