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Post-retirement benefits - Summary of the reasonably possible changes (Detail) $ in Millions	Dec. 31, 2024 USD ($)
Effect on the discount rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ 3.6
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	(4.4)
Effect on medical inflation
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	(4.3)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 3.6

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

+ References

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

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