Pension and other postretirement benefits - Schedule of Weighted Average Assumptions (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
OPEB Plans (i)
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.86%	5.08%	2.59%
Rate of compensation increase	2.75%	2.80%	2.22%
United States | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	4.95%	5.20%	2.70%
Rate of compensation increase			3.50%
Expected long‐term rate of return on plan assets	5.50%	5.50%	5.50%
Non-U.S. | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.49%	4.13%	1.54%
Rate of compensation increase	3.22%	3.22%	2.74%
Expected long‐term rate of return on plan assets	3.62%	4.04%	2.54%
Interest crediting rates	1.60%	1.50%	2.25%