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Related party transactions - Investments in debt and equity affiliates (Details) - shares | Aug. 01, 2025 | Dec. 31, 2025 | Dec. 31, 2024
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ARC Home |  |  |
Related Party Transaction [Line Items] |  |  |
Loan securitization, ownership interest |  | 66.00% |
ARC Home | Related Party |  |  |
Related Party Transaction [Line Items] |  |  |
Loan securitization, ownership interest |  | 66.00% | 44.60%
Loan securitization, additional interest | 21.40% |  |
Share issued in connection with acquisition (in shares) | 2,027,676 |  |
MATH |  |  |
Related Party Transaction [Line Items] |  |  |
Loan securitization, ownership interest |  | 47.00% | 47.00%
MATH | Related Party |  |  |
Related Party Transaction [Line Items] |  |  |
Loan securitization, ownership interest |  | 47.00% |

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