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Fair value measurements - Schedule of Notional Amounts and Fair Values of Derivatives by Product (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Notional derivative asset	$ 13,985	$ 360
Fair value derivative asset	83	0
Notional derivative liability	16,013,985	11,475,360
Fair value derivative liability	1,068	1,071
Futures | Commodity contracts
Derivatives, Fair Value [Line Items]
Notional derivative liability	16,000,000	11,475,000
Fair value derivative liability	982	1,071
TBAs | Other contracts
Derivatives, Fair Value [Line Items]
Notional derivative asset	13,985	360
Fair value derivative asset	83	0
Notional derivative liability	13,985	360
Fair value derivative liability	$ 86	$ 0

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Nominal or face amount used to calculate payments on the derivative asset.

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