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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, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading $ 21,309,460 $ 20,877,108
Short term investments 4,639,165 4,604,079
Equity investments 119,992 106,766
Other investments 3,468,281 3,515,566
Derivative assets 8,116 44,724
Derivative liabilities (10,603) (29,991)
Total other liabilities (1,823) (2,742)
Total other assets 1,306 2,227
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 21,309,460 20,877,108
Short term investments 4,639,165 4,604,079
Equity investments 119,992 106,766
Other investments 3,468,281 3,515,566
Assumed and ceded (re)insurance contracts (517) (515)
Derivative assets 8,116 44,724
Derivative liabilities (10,603) (29,992)
Total other liabilities (3,004)  
Total other assets   14,217
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 29,533,894 29,117,736
Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 1,985,552 2,099,762
Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 9,793,911 10,060,203
Short term investments 335,342 130,232
Equity investments 119,992 106,766
Other investments 0 0
Assumed and ceded (re)insurance contracts 0 0
Derivative assets 3,521 16,701
Derivative liabilities (1,719) (10,372)
Total other assets 1,802 6,329
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 10,251,047 10,303,530
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 11,515,549 10,816,905
Short term investments 4,303,823 4,473,847
Equity investments 0 0
Other investments 1,828,155 1,942,199
Assumed and ceded (re)insurance contracts 0 0
Derivative assets 4,595 28,023
Derivative liabilities (8,884) (19,620)
Total other liabilities (4,289)  
Total other assets   8,403
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 17,643,238 17,241,354
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
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 157,397 157,563
Assumed and ceded (re)insurance contracts (517) (515)
Derivative assets 0 0
Derivative liabilities 0 0
Total other liabilities (517) (515)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 156,880 157,048
Significant Unobservable Inputs (Level 3) | Other assets | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assumed and ceded (re)insurance contracts (1,300) (2,200)
Significant Unobservable Inputs (Level 3) | Other liabilities | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assumed and ceded (re)insurance contracts (1,800) (2,700)
U.S. treasuries | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 9,793,911 10,060,203
U.S. treasuries | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 9,793,911 10,060,203
U.S. treasuries | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
U.S. treasuries | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
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 7,064,030 6,499,075
Corporate | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
Corporate | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 7,064,030 6,499,075
Corporate | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
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 1,616,444 1,420,362
Residential mortgage-backed | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
Residential mortgage-backed | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 1,616,444 1,420,362
Residential mortgage-backed | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
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 1,428,513 1,491,695
Asset-backed | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
Asset-backed | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 1,428,513 1,491,695
Asset-backed | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
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 594,522 489,117
Agencies | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
Agencies | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 594,522 489,117
Agencies | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
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 495,426 483,576
Non-U.S. government | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
Non-U.S. government | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 495,426 483,576
Non-U.S. government | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
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 316,614 433,080
Commercial mortgage-backed | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
Commercial mortgage-backed | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 316,614 433,080
Commercial mortgage-backed | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
Catastrophe bonds | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 1,828,155 1,942,199
Catastrophe bonds | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 0 0
Catastrophe bonds | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 1,828,155 1,942,199
Catastrophe bonds | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 0 0
Term loans | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 97,433 97,658
Term loans | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 0 0
Term loans | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 0 0
Term loans | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 97,433 97,658
Direct private equity investments | Fair Value, Inputs, Level 1, 2 and 3 | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 59,964 59,905
Direct private equity investments | Quoted Prices in Active Markets for Identical  Assets (Level 1) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 0 0
Direct private equity investments | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 0 0
Direct private equity investments | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 59,964 59,905
Fund investments | Fair Value Measured at Net Asset Value Per Share | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments $ 1,482,729 $ 1,415,804