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% |