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Fair Value Measurements - Quantitative Information Used As Level 3 Inputs (Details) $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
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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Value of input used to measure alternative investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(f))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(12))
-Publisher FASB
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