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Fair Value Measurements - Quantitative Information Used as Level 3 Inputs (Details)
$ in Thousands
Jun. 30, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other investments $ 2,314,232 $ 1,993,059
Other liabilities (6,001) (10,827)
Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other investments 2,314,232 1,993,059
Other liabilities   (3,792)
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 20,525,609 21,340,799
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other liabilities (3,064) (4,727)
Fair Value, Measurements, Recurring | Fair Value (Level 3)    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other investments 181,610 163,223
Other liabilities (3,064) (4,727)
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 178,546 158,496
Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Assumed and ceded (re)insurance contracts, group two    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other liabilities (3,064) (4,727)
Fair Value, Measurements, Recurring | Direct private equity investments | Fair Value (Level 3)    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other investments 81,610 88,373
Fair Value, Measurements, Recurring | Direct private equity investments | Internal valuation model | Fair Value (Level 3)    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other investments 81,610 88,373
Fair Value, Measurements, Recurring | Term loans | Fair Value (Level 3)    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other investments 100,000 74,850
Fair Value, Measurements, Recurring | Term loans | Internal valuation model | Fair Value (Level 3)    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other investments 100,000 74,900
Fair Value, Measurements, Recurring | Term loans | Discounted cash flow | Fair Value (Level 3)    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other investments $ 100,000 $ 74,850
Discount rate | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group two    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs (in dollars per share) 0.030 0.013
Discount rate | Fair Value, Measurements, Recurring | Direct private equity investments | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs (in dollars per share) | $ / shares 0.075 0.075
Liquidity discount | Fair Value, Measurements, Recurring | Direct private equity investments | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs (in dollars per share) | $ / shares 0.150 0.150
Credit spread adjustment | Fair Value, Measurements, Recurring | Term loans | Discounted cash flow | Fair Value (Level 3) | Weighted Average or Actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs (in dollars per share) | $ / shares 0.002 0.002
Risk premium | Fair Value, Measurements, Recurring | Term loans | Discounted cash flow | Fair Value (Level 3) | Weighted Average or Actual    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs (in dollars per share) | $ / shares 0.026 0.026
Net undiscounted cash flows | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group two    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs (in dollars per share) 14,933,000 14,920,000
Expected loss ratio | Fair Value, Measurements, Recurring | Internal valuation model | Fair Value (Level 3) | Weighted Average or Actual | Assumed and ceded (re)insurance contracts, group two    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Significant observable and unobservable inputs (in dollars per share) 0.084 0.147