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Fair Value Measurements (Quantitative Information Used As Level 3 Inputs) (Details)
$ in Thousands
Dec. 31, 2021
USD ($)
$ / shares
Dec. 31, 2020
USD ($)
$ / shares
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments $ 1,993,059 $ 1,256,948
Other liabilities (10,827) (15,193)
Other assets 6,100 8,982
Fair Value, Measurements, Recurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments 1,993,059 1,256,948
Other liabilities (3,792)  
Other assets   16,662
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 21,340,799 20,476,465
Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other liabilities (4,727) (6,211)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments 163,223 79,807
Other liabilities (4,727) (6,211)
Total other assets and (liabilities) measured at fair value on a recurring basis using Level 3 inputs 158,496 73,596
Fair Value, Measurements, Recurring | Direct private equity investments | Significant Unobservable Inputs (Level 3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments 88,373 79,807
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 88,373 $ 79,807
Fair Value, Measurements, Recurring | Term loans | Significant Unobservable Inputs (Level 3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Other investments 74,850  
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 $ 74,850  
Discount rate | Fair Value, Measurements, Recurring | 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 | $ / shares 0.075 0.090
Liquidity discount | Fair Value, Measurements, Recurring | 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 | $ / shares 0.150 0.150
Transaction yield | Fair Value, Measurements, Recurring | Direct private equity investments | Yield analysis | Significant Unobservable Inputs (Level 3) | Weighted Average or Actual    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant observable and unobservable inputs | $ / shares 0.0278  
Expected loss ratio | Fair Value, Measurements, Recurring | Assumed and ceded (re)insurance contracts, group three | Internal valuation model | Significant Unobservable Inputs (Level 3)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant observable and unobservable inputs   0.000