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Fair Value Measurements (Quantitative Information Used as Level 3 Inputs) (Details)
$ in Thousands
Sep. 30, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other investments $ 1,738,737 $ 1,256,948
Other liabilities (12,966) (15,193)
Fair Value, Measurements, Recurring    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other investments 1,738,737 1,256,948
Other liabilities (16,008)  
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 20,757,089 20,476,465
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other liabilities (5,521) (6,211)
Fair Value, Measurements, Recurring | Fair Value (Level 3)    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other investments 84,587 79,807
Other liabilities (5,521) (6,211)
Total assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 79,066 73,596
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 (5,521) (6,211)
Fair Value, Measurements, Recurring | Private equity and private credit funds | Fair Value (Level 3)    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other investments 84,587 79,807
Fair Value, Measurements, Recurring | Private equity and private credit funds | Internal valuation model | Fair Value (Level 3)    
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items]    
Other investments $ 84,587 $ 79,807
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) 0.010 0.004
Discount rate | Fair Value, Measurements, Recurring | Private equity and private credit funds | 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 0.090 0.090
Liquidity discount | Fair Value, Measurements, Recurring | Private equity and private credit funds | 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
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) 14,539,000 12,514,000
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) 0.168 0.240