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Other non-current liabilities and employee future benefits - Actuarial Assumptions (Details)
Dec. 31, 2023
Dec. 31, 2022
Net defined benefit pension plan liability    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate, fair value benefit obligation 4.88% 5.00%
Discount rate, net expense 5.00% 2.76%
Net other post-retirement benefit plan liability    
Disclosure of sensitivity analysis for actuarial assumptions [line items]    
Discount rate, fair value benefit obligation 4.67% 4.89%
Discount rate, net expense 4.67% 4.89%