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Fair value - Schedule of Fair Value Assets Measured on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | $ 5,815,337 | $ 5,624,773
Short-term investments | 3,696 | 3,367
State and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 476,141 | 467,476
Non-U.S. government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 113,153 | 83,802
U.S. corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 2,900,205 | 2,825,679
Non-U.S. corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 768,953 | 772,624
Residential mortgage-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 111,683 | 8,364
Commercial mortgage-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 20,702 |
Other asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 1,135,492 | 1,189,465
Fair value, recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 5,815,337 | 5,624,773
Short-term investments | 3,696 | 3,367
Total | 5,819,033 | 5,628,140
Fair value, recurring | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 0 | 0
Short-term investments | 0 | 0
Total | 0 | 0
Fair value, recurring | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 5,535,633 | 5,343,232
Short-term investments | 3,696 | 3,367
Total | 5,539,329 | 5,346,599
Fair value, recurring | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 279,704 | 281,541
Short-term investments | 0 | 0
Total | 279,704 | 281,541
Fair value, recurring | U.S. government, agencies and GSEs |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 289,008 | 277,363
Fair value, recurring | U.S. government, agencies and GSEs | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 0 | 0
Fair value, recurring | U.S. government, agencies and GSEs | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 289,008 | 277,363
Fair value, recurring | U.S. government, agencies and GSEs | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 0 | 0
Fair value, recurring | State and political subdivisions |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 476,141 | 467,476
Fair value, recurring | State and political subdivisions | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 0 | 0
Fair value, recurring | State and political subdivisions | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 476,141 | 467,476
Fair value, recurring | State and political subdivisions | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 0 | 0
Fair value, recurring | Non-U.S. government |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 113,153 | 83,802
Fair value, recurring | Non-U.S. government | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 0 | 0
Fair value, recurring | Non-U.S. government | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 113,153 | 83,802
Fair value, recurring | Non-U.S. government | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 0 | 0
Fair value, recurring | U.S. corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 2,900,205 | 2,825,679
Fair value, recurring | U.S. corporate | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 0 | 0
Fair value, recurring | U.S. corporate | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 2,674,235 | 2,602,893
Fair value, recurring | U.S. corporate | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 225,970 | 222,786
Fair value, recurring | Non-U.S. corporate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 768,953 | 772,624
Fair value, recurring | Non-U.S. corporate | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 0 | 0
Fair value, recurring | Non-U.S. corporate | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 718,479 | 716,071
Fair value, recurring | Non-U.S. corporate | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 50,474 | 56,553
Fair value, recurring | Residential mortgage-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 111,683 | 8,364
Fair value, recurring | Residential mortgage-backed | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 0 | 0
Fair value, recurring | Residential mortgage-backed | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 111,683 | 8,364
Fair value, recurring | Residential mortgage-backed | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 0 | 0
Fair value, recurring | Commercial mortgage-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 20,702 |
Fair value, recurring | Commercial mortgage-backed | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 0 |
Fair value, recurring | Commercial mortgage-backed | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 20,702 |
Fair value, recurring | Commercial mortgage-backed | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 0 |
Fair value, recurring | Other asset-backed |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 1,135,492 | 1,189,465
Fair value, recurring | Other asset-backed | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 0 | 0
Fair value, recurring | Other asset-backed | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | 1,132,232 | 1,187,263
Fair value, recurring | Other asset-backed | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Total fixed maturity securities | $ 3,260 | $ 2,202

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