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INVESTMENTS - Schedule of Net Realized and Unrealized Gains (Losses) on Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments	$ 332,940	$ (213,654)
Fixed maturity investments trading
Gain (Loss) on Securities [Line Items]
Gross realized gains on fixed maturity investments trading	38,961	69,389
Gross realized losses on fixed maturity investments trading	(28,926)	(59,593)
Net realized gains (losses) on fixed maturity investments trading	10,035	9,796
Net unrealized gains (losses) on fixed maturity investments trading	226,240	(211,996)
Net realized and unrealized gains (losses) on fixed maturity investments trading	236,275	(202,200)
Derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investment-related derivatives	141,646	(57,806)
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on equity investments	8	0
Net unrealized gains (losses) on equity investments	2,950	13,097
Net realized and unrealized gains (losses) on equity investments	2,958	13,097
Catastrophe bonds
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on other investments	(40,413)	18,907
Other
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on other investments	$ (7,526)	$ 14,348

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments and relating to the entity's investment portfolio.

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