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Net realized and unrealized gains - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]    
Gain from sale of real property $ 1.2 $ 1.2
Contingent liability adjustment   $ 1.2