Defined contribution and defined benefit retirement plans - Summary of Actuarial Assumptions Used to Determine Net Periodic Benefit Cost (Credit) (Details) - Pension plans defined benefit	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
United States
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	5.00%	5.30%	2.60%
Long-term return on plan assets	5.00%	5.00%	4.00%
Non U.S.
Pension Plans Postretirement And Other Employee Benefits [Line Items]
Discount rate	3.40%	3.90%	1.50%
Increase in future compensation levels	2.70%	2.70%	2.60%
Long-term return on plan assets	4.90%	4.60%	2.50%