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Fair value - Schedule of Additional Information about Fair Value Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance $ 281,541 $ 331,484  
Total realized and unrealized gains (losses) included in net income 242 8  
Total realized and unrealized gains (losses) included in OCI 3,363 (2,523)  
Purchases 2,786 3,935  
Sales 0 0  
Settlements (8,328) (523)  
Transfer into Level 3 100 4,651  
Transfer out of Level 3 0 (2,088)  
Ending Balance 279,704 334,944  
Total gains (losses) attributable to assets still held included in net income 242 8  
Total gains (losses) attributable to assets still held included in OCI 3,355 (2,548)  
Fixed maturity securities available-for-sale, at fair value (amortized cost of $5,992,370 and $5,876,502; allowance for credit losses of $273 and $0) 5,815,337   $ 5,624,773
Commercial mortgage-backed      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fixed maturity securities available-for-sale, at fair value (amortized cost of $5,992,370 and $5,876,502; allowance for credit losses of $273 and $0) 20,702    
Fair value, recurring      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fixed maturity securities available-for-sale, at fair value (amortized cost of $5,992,370 and $5,876,502; allowance for credit losses of $273 and $0) 5,815,337   $ 5,624,773
Fair value, recurring | Commercial mortgage-backed      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Fixed maturity securities available-for-sale, at fair value (amortized cost of $5,992,370 and $5,876,502; allowance for credit losses of $273 and $0) 20,702    
U.S. corporate      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 222,786 247,205  
Total realized and unrealized gains (losses) included in net income 239 (7)  
Total realized and unrealized gains (losses) included in OCI 3,167 (1,892)  
Purchases 0 0  
Sales 0 0  
Settlements (222) (358)  
Transfer into Level 3 0 4,651  
Transfer out of Level 3 0 0  
Ending Balance 225,970 249,599  
Total gains (losses) attributable to assets still held included in net income 239 (7)  
Total gains (losses) attributable to assets still held included in OCI 3,167 (1,892)  
Non-U.S. corporate      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 56,553 81,321  
Total realized and unrealized gains (losses) included in net income (6) 7  
Total realized and unrealized gains (losses) included in OCI 232 (669)  
Purchases 1,800 0  
Sales 0 0  
Settlements (8,105) (105)  
Transfer into Level 3 0 0  
Transfer out of Level 3 0 0  
Ending Balance 50,474 80,554  
Total gains (losses) attributable to assets still held included in net income (6) 7  
Total gains (losses) attributable to assets still held included in OCI 223 (669)  
Other asset-backed      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 2,202 2,958  
Total realized and unrealized gains (losses) included in net income 9 8  
Total realized and unrealized gains (losses) included in OCI (36) 38  
Purchases 986 3,935  
Sales 0 0  
Settlements (1) (60)  
Transfer into Level 3 100 0  
Transfer out of Level 3 0 (2,088)  
Ending Balance 3,260 4,791  
Total gains (losses) attributable to assets still held included in net income 9 8  
Total gains (losses) attributable to assets still held included in OCI $ (35) $ 13