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FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading $ 23,562,514 $ 20,877,108
Short term investments, at fair value - amortized cost $4,532,166 at December 31, 2024 (2023 - $4,603,340) (Notes 5 and 6) 4,531,655 4,604,079
Equity investments 117,756 106,766
Other investments 4,324,761 3,515,566
Derivative assets 34,538 44,724
Derivative liabilities (75,878) (29,991)
Other liabilities (2,434) (2,742)
Other assets 2,029 2,227
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 23,562,514 20,877,108
Short term investments, at fair value - amortized cost $4,532,166 at December 31, 2024 (2023 - $4,603,340) (Notes 5 and 6) 4,531,655 4,604,079
Equity investments 117,756 106,766
Other investments 4,324,761 3,515,566
Assumed and ceded (re)insurance contracts (405) (515)
Derivative assets 34,538 44,724
Derivative liabilities (75,878) (29,992)
Other liabilities (41,745)  
Other assets   14,217
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 32,494,941 29,117,736
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 11,001,893 10,060,203
Short term investments, at fair value - amortized cost $4,532,166 at December 31, 2024 (2023 - $4,603,340) (Notes 5 and 6) 99,343 130,232
Equity investments 117,756 106,766
Other investments 0 0
Assumed and ceded (re)insurance contracts 0 0
Derivative assets 10,614 16,701
Derivative liabilities (7,872) (10,372)
Other assets 2,742 6,329
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 11,221,734 10,303,530
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 12,560,621 10,816,905
Short term investments, at fair value - amortized cost $4,532,166 at December 31, 2024 (2023 - $4,603,340) (Notes 5 and 6) 4,432,312 4,473,847
Equity investments 0 0
Other investments 2,152,485 1,942,199
Assumed and ceded (re)insurance contracts 0 0
Derivative assets 23,924 28,023
Derivative liabilities (68,006) (19,620)
Other liabilities (44,082)  
Other assets   8,403
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 19,101,336 17,241,354
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, at fair value - amortized cost $4,532,166 at December 31, 2024 (2023 - $4,603,340) (Notes 5 and 6) 0 0
Equity investments 0 0
Other investments 43,777 157,563
Assumed and ceded (re)insurance contracts (405) (515)
Derivative assets 0 0
Derivative liabilities 0 0
Other liabilities (405) (515)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 43,372 157,048
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 2,196,262 2,099,762
U.S. treasuries | Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 11,001,893 10,060,203
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 11,001,893 10,060,203
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 7,862,423 6,499,075
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 7,862,423 6,499,075
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 1,707,056 1,420,362
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 1,707,056 1,420,362
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 1,422,393 1,491,695
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 1,422,393 1,491,695
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 623,489 489,117
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 623,489 489,117
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 618,809 483,576
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 618,809 483,576
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 326,451 433,080
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 326,451 433,080
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
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 1,984,396 1,942,199
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
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 1,984,396 1,942,199
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 168,089 0
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 43,777 59,905
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 211,866 59,905
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 2,128,499 1,415,804
Term loans | 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
Term loans | 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   0
Term loans | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments   97,658
Term loans | 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   97,658
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]    
Other assets 2,000 2,200
Assumed and ceded (re)insurance contracts | Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other Liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other liabilities $ (2,400) $ (2,700)