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FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | $ 23,310,208 | $ 23,562,514
Short term investments | 5,054,254 | 4,531,655
Equity investments | 887,508 | 117,756
Other investments | 4,239,952 | 4,324,761
Derivative assets | 24,277 | 34,538
Derivative liabilities | (18,656) | (75,878)
Total other liabilities | (1,334) | (2,434)
Total other assets | 1,100 | 2,029
Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 23,310,208 | 23,562,514
Short term investments | 5,054,254 | 4,531,655
Equity investments | 887,508 | 117,756
Other investments | 4,239,952 | 4,324,761
Assumed and ceded (re)insurance contracts | (234) | (405)
Derivative assets | 24,277 | 34,538
Derivative liabilities | (18,656) | (75,878)
Total other liabilities |  | (41,745)
Total other assets | 5,387 |
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 33,497,309 | 32,494,941
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 11,199,657 | 11,001,893
Short term investments | 44,219 | 99,343
Equity investments | 887,508 | 117,756
Other investments | 0 | 0
Assumed and ceded (re)insurance contracts | 0 | 0
Derivative assets | 16,000 | 10,614
Derivative liabilities | (4,198) | (7,872)
Total other assets | 11,802 | 2,742
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 12,143,186 | 11,221,734
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 12,110,551 | 12,560,621
Short term investments | 5,010,035 | 4,432,312
Equity investments | 0 | 0
Other investments | 1,821,837 | 2,152,485
Assumed and ceded (re)insurance contracts | 0 | 0
Derivative assets | 8,277 | 23,924
Derivative liabilities | (14,458) | (68,006)
Total other liabilities | (6,181) | (44,082)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 18,936,242 | 19,101,336
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
Short term investments | 0 | 0
Equity investments | 0 | 0
Other investments | 38,987 | 43,777
Assumed and ceded (re)insurance contracts | (234) | (405)
Derivative assets | 0 | 0
Derivative liabilities | 0 | 0
Total other liabilities | (234) | (405)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs | 38,753 | 43,372
U.S. treasuries | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 11,199,657 | 11,001,893
U.S. treasuries | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 11,199,657 | 11,001,893
U.S. treasuries | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
U.S. treasuries | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
Corporate | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 7,795,056 | 7,862,423
Corporate | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
Corporate | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 7,795,056 | 7,862,423
Corporate | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
Residential mortgage-backed | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 1,393,065 | 1,707,056
Residential mortgage-backed | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
Residential mortgage-backed | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 1,393,065 | 1,707,056
Residential mortgage-backed | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
Asset-backed | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 1,396,178 | 1,422,393
Asset-backed | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
Asset-backed | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 1,396,178 | 1,422,393
Asset-backed | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
Agencies | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 617,537 | 623,489
Agencies | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
Agencies | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 617,537 | 623,489
Agencies | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
Non-U.S. government | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 600,986 | 618,809
Non-U.S. government | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
Non-U.S. government | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 600,986 | 618,809
Non-U.S. government | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
Commercial mortgage-backed | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 307,729 | 326,451
Commercial mortgage-backed | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
Commercial mortgage-backed | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 307,729 | 326,451
Commercial mortgage-backed | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fixed maturity investments trading | 0 | 0
Fixed income exchange traded funds | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investments | 764,191 |
Fixed income exchange traded funds | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investments | 764,191 |
Fixed income exchange traded funds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investments | 0 |
Fixed income exchange traded funds | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investments | 0 |
Other equity investments | Fair Value, Measurements, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investments | 123,317 |
Other equity investments | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investments | 123,317 |
Other equity investments | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investments | 0 |
Other equity investments | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity investments | 0 |
Catastrophe bonds | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 1,653,148 | 1,984,396
Catastrophe bonds | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 0 | 0
Catastrophe bonds | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 1,653,148 | 1,984,396
Catastrophe bonds | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 0 | 0
Direct private equity investments | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1, 2 and 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 207,676 | 211,866
Direct private equity investments | Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 0 | 0
Direct private equity investments | Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 168,689 | 168,089
Direct private equity investments | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 38,987 | 43,777
Fund investments | Fair Value, Measurements, Recurring | Fair Value Measured at Net Asset Value Per Share |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other investments | 2,379,128 | 2,128,499
Assumed and ceded (re)insurance contracts | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other assets |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other assets | 1,100 | 2,000
Assumed and ceded (re)insurance contracts | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other liabilities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total other liabilities | $ (1,300) | $ (2,400)

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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