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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 |

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- Definition Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479130/326-30-45-1 + Details
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- Definition Amount of unrealized gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 102 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-102 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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