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Fair value - Summary of Fair Value Assets Measured on Recurring Basis, Significant Unobservable Input (Details)
$ in Thousands
Sep. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value $ 5,652,399 $ 5,266,141
U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 2,871,882 2,723,730
Non-U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 759,329 689,663
Fair value, recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 5,652,399 5,266,141
Fair value, recurring | U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 2,871,882 2,723,730
Fair value, recurring | Non-U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value $ 759,329 689,663
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) 0.0014  
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) 0.0193  
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) 0.0100  
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) 0.0084  
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) 0.0136  
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) 0.0111  
Level 3  | Fair value, recurring    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value $ 301,680 331,484
Level 3  | Fair value, recurring | Internal models    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 284,200  
Level 3  | Fair value, recurring | U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 232,914 247,205
Level 3  | Fair value, recurring | U.S. corporate | Internal models    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 232,914  
Level 3  | Fair value, recurring | Non-U.S. corporate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value 61,584 $ 81,321
Level 3  | Fair value, recurring | Non-U.S. corporate | Internal models    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Fair value $ 51,315