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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, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments	$ (127,584)	$ (222,781)	$ (341,238)	$ 56,670
Fixed maturity investments trading
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on fixed maturity investments trading	(65,813)	(74,212)	(56,017)	(178,977)
Net unrealized gains (losses) on fixed maturity investments trading	(24,848)	(139,793)	(236,844)	172,233
Net realized and unrealized gains (losses) on fixed maturity investments trading	(90,661)	(214,005)	(292,861)	(6,744)
Derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investment-related derivatives	10,374	(65,051)	(47,432)	(52,889)
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on equity investments	15	(18,755)	15	(27,493)
Net unrealized gains (losses) on equity investments	(5,507)	20,627	7,590	59,778
Net realized and unrealized gains (losses) on equity investments	(5,492)	1,872	7,605	32,285
Catastrophe bonds
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on other investments	(34,107)	38,186	(15,200)	62,312
Other
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on other investments	$ (7,698)	$ 16,217	$ 6,650	$ 21,706

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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 220
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-Name Accounting Standards Codification
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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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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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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 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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Amount of unrealized 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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The aggregate amount of gains or losses resulting from nonoperating activities (for example, interest and dividend revenue, property, plant and equipment impairment loss, and so forth).

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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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