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Pension and other postretirement benefits - Schedule of Weighted Average Assumptions Used to Determine Benefit Obligation (Details)
Dec. 31, 2023
Dec. 31, 2022
Pension Plans | United States    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 4.95% 5.20%
Pension Plans | Non-U.S.    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 3.49% 4.13%
Rate of compensation increase 3.22% 3.22%
OPEB Plans    
Defined Benefit Plan Disclosure [Line Items]    
Discount rate 4.86% 5.08%
Rate of compensation increase 2.75% 2.80%