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Income taxes - Narrative (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024 | Dec. 06, 2023
Operating Loss Carryforwards [Line Items] |  |  |
Less: valuation allowance | $ 28,537,000 | $ 34,737,000 |
Uncertain tax position, interest and penalties expense | 0 | 0 |
Subsidiaries |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 115,300,000 | 130,500,000 |
Capital Loss Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward | 63,900,000 | 278,900,000 |
Capital Loss Carryforward | Tax Year 2020 |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward | 225,700,000 |  |
Western Asset Mortgage Capital Corporation |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards | 317,300,000 | 319,400,000 | $ 321,600,000
Operating loss carryforwards, not subject to expiration |  |  | $ 223,800,000
Western Asset Mortgage Capital Corporation | Capital Loss Carryforward |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward | $ 153,900,000 | $ 150,600,000 |

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