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Fair Value - Summary of Fair Value Assets Measured on Recurring Basis, Significant Unobservable Input (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total fixed maturity securities $ 4,884,760 $ 5,266,339
U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total fixed maturity securities 2,646,863 2,945,303
Non-U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total fixed maturity securities 652,844 666,594
Fair value, recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total fixed maturity securities 4,884,760  
Fair value, recurring | U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total fixed maturity securities 2,646,863 2,945,303
Fair value, recurring | Non-U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total fixed maturity securities $ 652,844 666,594
Level 3 | U.S. corporate | Internal models | Credit spreads | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities, measurement input (in basis points) 0.0055  
Level 3 | U.S. corporate | Internal models | Credit spreads | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities, measurement input (in basis points) 0.0205  
Level 3 | U.S. corporate | Internal models | Credit spreads | Weighted average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities, measurement input (in basis points) 0.0140  
Level 3 | Non-U.S. corporate | Internal models | Credit spreads | Minimum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities, measurement input (in basis points) 0.0083  
Level 3 | Non-U.S. corporate | Internal models | Credit spreads | Maximum    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities, measurement input (in basis points) 0.0211  
Level 3 | Non-U.S. corporate | Internal models | Credit spreads | Weighted average    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fixed maturity securities, measurement input (in basis points) 0.0129  
Level 3 | Fair value, recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total fixed maturity securities $ 319,261  
Level 3 | Fair value, recurring | Internal models    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total fixed maturity securities 312,600  
Level 3 | Fair value, recurring | U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total fixed maturity securities 220,626 220,733
Level 3 | Fair value, recurring | U.S. corporate | Internal models    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total fixed maturity securities 217,399  
Level 3 | Fair value, recurring | Non-U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total fixed maturity securities 95,154 $ 83,664
Level 3 | Fair value, recurring | Non-U.S. corporate | Internal models    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Total fixed maturity securities $ 95,154