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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading $ 20,877,108 $ 14,351,402
Short term investments 4,604,079 4,669,272
Equity investments 106,766 625,058
Other investments 3,515,566 2,494,954
Derivative assets 44,724 44,421
Derivative liabilities (29,991) (7,581)
Other assets 2,227 3,499
Other liabilities 2,742 5,331
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 20,877,108 14,351,402
Short term investments 4,604,079 4,669,272
Equity investments 106,766 625,058
Other investments 3,515,566 2,494,954
Assumed and ceded (re)insurance contracts (515) (1,832)
Derivative assets 44,724 44,400
Derivative liabilities (29,992) (7,560)
Other assets 14,217 35,008
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 29,117,736 22,175,694
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 2,099,762 1,408,248
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 10,060,203 7,180,129
Short term investments 130,232 0
Equity investments 106,766 625,058
Other investments 0 0
Assumed and ceded (re)insurance contracts 0 0
Derivative assets 16,701 387
Derivative liabilities (10,372) (2,008)
Other assets 6,329  
Other liabilities   1,621
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 10,303,530 7,803,566
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 10,816,905 7,171,273
Short term investments 4,473,847 4,669,272
Equity investments 0 0
Other investments 1,942,199 1,241,468
Assumed and ceded (re)insurance contracts 0 0
Derivative assets 28,023 44,013
Derivative liabilities (19,620) (5,552)
Other assets 8,403 38,461
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 17,241,354 13,120,474
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 157,563 166,780
Assumed and ceded (re)insurance contracts (515) (1,832)
Derivative assets 0 0
Derivative liabilities 0 0
Other liabilities 515 1,832
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 157,048 164,948
Fair Value, Measurements, Recurring | U.S. treasuries    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 10,060,203 7,180,129
Fair Value, Measurements, Recurring | U.S. treasuries | 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 10,060,203 7,180,129
Fair Value, Measurements, Recurring | U.S. treasuries | 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
Fair Value, Measurements, Recurring | U.S. treasuries | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
Fair Value, Measurements, Recurring | Corporate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 6,499,075 4,390,568
Fair Value, Measurements, Recurring | Corporate | 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
Fair Value, Measurements, Recurring | Corporate | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 6,499,075 4,390,568
Fair Value, Measurements, Recurring | Corporate | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
Fair Value, Measurements, Recurring | Asset-backed    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 1,491,695 1,077,302
Fair Value, Measurements, Recurring | Asset-backed | 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
Fair Value, Measurements, Recurring | Asset-backed | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 1,491,695 1,077,302
Fair Value, Measurements, Recurring | Asset-backed | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
Fair Value, Measurements, Recurring | Residential mortgage-backed    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 1,420,362 710,429
Fair Value, Measurements, Recurring | Residential mortgage-backed | 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
Fair Value, Measurements, Recurring | Residential mortgage-backed | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 1,420,362 710,429
Fair Value, Measurements, Recurring | Residential mortgage-backed | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
Fair Value, Measurements, Recurring | Agencies    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 489,117 395,149
Fair Value, Measurements, Recurring | Agencies | 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
Fair Value, Measurements, Recurring | Agencies | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 489,117 395,149
Fair Value, Measurements, Recurring | Agencies | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
Fair Value, Measurements, Recurring | Non-U.S. government    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 483,576 383,838
Fair Value, Measurements, Recurring | Non-U.S. government | 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
Fair Value, Measurements, Recurring | Non-U.S. government | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 483,576 383,838
Fair Value, Measurements, Recurring | Non-U.S. government | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
Fair Value, Measurements, Recurring | Commercial mortgage-backed    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 433,080 213,987
Fair Value, Measurements, Recurring | Commercial mortgage-backed | 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
Fair Value, Measurements, Recurring | Commercial mortgage-backed | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 433,080 213,987
Fair Value, Measurements, Recurring | Commercial mortgage-backed | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity investments trading 0 0
Fair Value, Measurements, Recurring | Catastrophe bonds | Fair Value, Inputs, Level 1, 2 and 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 1,942,199 1,241,468
Fair Value, Measurements, Recurring | Catastrophe bonds | 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
Fair Value, Measurements, Recurring | Catastrophe bonds | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 1,942,199 1,241,468
Fair Value, Measurements, Recurring | Catastrophe bonds | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 0 0
Fair Value, Measurements, Recurring | Term loans | Fair Value, Inputs, Level 1, 2 and 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 97,658 100,000
Fair Value, Measurements, Recurring | Term loans | 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
Fair Value, Measurements, Recurring | Term loans | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 0 0
Fair Value, Measurements, Recurring | Term loans | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 97,658 100,000
Fair Value, Measurements, Recurring | Direct private equity investments | Fair Value, Inputs, Level 1, 2 and 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 59,905 66,780
Fair Value, Measurements, Recurring | Direct private equity investments | 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
Fair Value, Measurements, Recurring | Direct private equity investments | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 0 0
Fair Value, Measurements, Recurring | Direct private equity investments | Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 59,905 66,780
Fair Value, Measurements, Recurring | Fund investments | Fair Value Measured at Net Asset Value Per Share    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other investments 1,415,804 1,086,706
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Significant Unobservable Inputs (Level 3) | Other assets    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other assets 2,200 3,500
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts | Significant Unobservable Inputs (Level 3) | Other liabilities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other liabilities $ 2,700 $ 5,300