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INVESTMENTS - Schedule of Fair Value of Fixed Maturity Investments Trading (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Schedule of Investments [Line Items]
Total fixed maturity investments trading	$ 23,310,208	$ 23,562,514
U.S. treasuries
Schedule of Investments [Line Items]
Total fixed maturity investments trading	11,199,657	11,001,893
Corporate
Schedule of Investments [Line Items]
Total fixed maturity investments trading	7,795,056	7,862,423
Residential mortgage-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	1,393,065	1,707,056
Asset-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	1,396,178	1,422,393
Agencies
Schedule of Investments [Line Items]
Total fixed maturity investments trading	617,537	623,489
Non-U.S. government
Schedule of Investments [Line Items]
Total fixed maturity investments trading	600,986	618,809
Commercial mortgage-backed
Schedule of Investments [Line Items]
Total fixed maturity investments trading	$ 307,729	$ 326,451

X

- Definition

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

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