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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investments	$ 943,745	$ (228,087)	$ 602,507	$ (171,417)
Fixed maturity investments trading
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on fixed maturity investments trading	22,052	(121,112)	(33,965)	(300,089)
Net unrealized gains (losses) on fixed maturity investments trading	590,309	(158,226)	353,465	14,007
Net realized and unrealized gains (losses) on fixed maturity investments trading	612,361	(279,338)	319,500	(286,082)
Derivatives
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on investment-related derivatives	97,534	30,594	50,102	(22,295)
Equity investments
Gain (Loss) on Securities [Line Items]
Net realized gains (losses) on equity investments	340	(10)	355	(27,503)
Net unrealized gains (losses) on equity investments	18,778	2,261	26,368	62,039
Net realized and unrealized gains (losses) on equity investments	19,118	2,251	26,723	34,536
Catastrophe bonds
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on other investments	66,291	32,474	51,091	94,786
Other
Gain (Loss) on Securities [Line Items]
Net realized and unrealized gains (losses) on other investments	$ 148,441	$ (14,068)	$ 155,091	$ 7,638

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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
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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 (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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