Other assets and liabilities - Narrative (Details) - USD ($) $ in Millions |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Derivative Instruments and Hedging Activities Disclosure [Abstract] | ||
| Cash as collateral for certain derivatives | $ 11.4 | $ 9.6 |
| Cash collateral posted by company | 1.7 | 5.5 |
| Cash pledged as collateral against derivatives related to variation margin | $ 9.7 | $ 4.1 |