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Benefit plans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Retirement Benefits [Abstract]        
Company contributions to plan $ 0.2 $ 0.5 $ 0.5 $ 1.1