Fair value measurements - Schedule of Notional Amounts and Fair Values of Derivatives by Product (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Derivatives, Fair Value [Line Items]
Notional derivative asset	$ 512,100	$ 360
Fair value derivative asset	94	0
Notional derivative liability	12,382,100	11,475,360
Fair value derivative liability	946	1,071
Future | Commodity contracts
Derivatives, Fair Value [Line Items]
Notional derivative asset	500,000
Fair value derivative asset	0
Notional derivative liability	12,370,000	11,475,000
Fair value derivative liability	846	1,071
TBAs | Other contracts
Derivatives, Fair Value [Line Items]
Notional derivative asset	12,100	360
Fair value derivative asset	94	0
Notional derivative liability	12,100	360
Fair value derivative liability	$ 100	$ 0