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Fair Value Measurements - Quantitative Information Used As Level 3 Inputs (Details) $ in Thousands | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | $ 3,515,566 | $ 2,494,954
Other liabilities | (2,742) | (5,331)
Fair Value, Measurements, Recurring |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 3,515,566 | 2,494,954
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 | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 157,563 | 166,780
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 | Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other liabilities | (515) | (1,832)
Fair Value, Measurements, Recurring | Internal valuation model | Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts, group two |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other liabilities | (515) | (1,832)
Fair Value, Measurements, Recurring | Direct private equity investments | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 59,905 | 66,780
Fair Value, Measurements, Recurring | Direct private equity investments | Internal valuation model | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 59,905 | 66,780
Fair Value, Measurements, Recurring | Term loans | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 97,658 | 100,000
Fair Value, Measurements, Recurring | Term loans | Internal valuation model | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | 97,700 | 100,000
Fair Value, Measurements, Recurring | Term loans | Discounted cash flow | Significant Unobservable Inputs (Level 3) |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Other investments | $ 97,658 | $ 100,000
Fair Value, Measurements, Recurring | Discount rate | Internal valuation model | Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts, group two | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | 0.207 | 0.040
Fair Value, Measurements, Recurring | Discount rate | Direct private equity investments | Internal valuation model | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | 0.100 | 0.075
Fair Value, Measurements, Recurring | Liquidity discount | Direct private equity investments | Internal valuation model | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | 0.150 | 0.150
Fair Value, Measurements, Recurring | Credit spread adjustment | Term loans | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | 0.002 | 0.002
Fair Value, Measurements, Recurring | Risk premium | Term loans | Discounted cash flow | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | 0.026 | 0.026
Fair Value, Measurements, Recurring | Net undiscounted cash flows | Internal valuation model | Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts, group two | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | 12,478,000 | 14,734,000
Fair Value, Measurements, Recurring | Expected loss ratio | Internal valuation model | Significant Unobservable Inputs (Level 3) | Assumed and ceded (re)insurance contracts, group two | Weighted Average or Actual |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Significant observable and unobservable inputs | 0.023 | 0.058

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