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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
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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

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other 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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- 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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