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INVESTMENTS - Schedule of Net Realized and Unrealized Gains (Losses) on Investments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments	$ 311,890	$ 943,745	$ 994,550	$ 602,507
Fixed maturity investments trading
Gain (Loss) on Securities [Line Items]
Gross realized gains on fixed maturity investments trading	31,036	41,538	83,919	128,544
Gross realized losses on fixed maturity investments trading	(11,743)	(19,486)	(56,358)	(162,509)
Net realized gains (losses) on fixed maturity investments trading	19,293	22,052	27,561	(33,965)
Net unrealized gains (losses) on fixed maturity investments trading	66,796	590,309	389,382	353,465
Net realized and unrealized gains (losses) on fixed maturity investments trading	86,089	612,361	416,943	319,500
Derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investment-related derivatives	181,012	97,534	498,089	50,102
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on equity investments	541	340	613	355
Net unrealized gains (losses) on equity investments	6,609	18,778	33,366	26,368
Net realized and unrealized gains (losses) on equity investments	7,150	19,118	33,979	26,723
Catastrophe bonds
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on other investments	44,592	66,291	(9,837)	51,091
Other
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on other investments	$ (6,953)	$ 148,441	$ 55,376	$ 155,091

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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 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 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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