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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 | 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

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