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INVESTMENTS - Schedule of Net Realized and Unrealized Gains (Losses) on Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments	$ 349,720	$ (127,584)	$ 682,660	$ (341,238)
Fixed maturity investments trading
Gain (Loss) on Securities [Line Items]
Gross realized gains on fixed maturity investments trading	13,922	17,617	52,883	87,006
Gross realized losses on fixed maturity investments trading	(15,689)	(83,430)	(44,615)	(143,023)
Net realized gains (losses) on fixed maturity investments trading	(1,767)	(65,813)	8,268	(56,017)
Net unrealized gains (losses) on fixed maturity investments trading	96,346	(24,848)	322,586	(236,844)
Net realized and unrealized gains (losses) on fixed maturity investments trading	94,579	(90,661)	330,854	(292,861)
Derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investment-related derivatives	175,431	10,374	317,077	(47,432)
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on equity investments	64	15	72	15
Net unrealized gains (losses) on equity investments	23,807	(5,507)	26,757	7,590
Net realized and unrealized gains (losses) on equity investments	23,871	(5,492)	26,829	7,605
Catastrophe bonds
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on other investments	(14,016)	(34,107)	(54,429)	(15,200)
Other
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on other investments	$ 69,855	$ (7,698)	$ 62,329	$ 6,650

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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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Amount of unrealized and realized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity), investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amount of unrealized and realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amount of realized gain on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of realized gain (loss) from sale of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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