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Related party transactions - Investments in debt and equity affiliates (Details) - shares	Aug. 01, 2025	Dec. 31, 2025	Dec. 31, 2024
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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