Post-retirement benefits - Summary of reconciliation (Detail) - Post-employment medical defined benefit plans [member] - Country of domicile [member] - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Disclosure of defined benefit plans [line items]
Balance at beginning of year	$ 46.1	$ 34.2
Current service cost	0.1	0.1
Interest expense	3.9	3.8
Remeasurement losses (gains):
Experience loss	1.2	3.9
(Gain) loss due to change in financial assumptions	(4.5)	2.8
Gain due to change in demographic assumptions	(4.5)	0.0
Benefits paid	(1.3)	(1.7)
Translation adjustments	(9.4)	3.0
Balance at end of year	$ 31.6	$ 46.1

Past service cost defined benefit plan.

No definition available.

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- Definition

Translation adjustment on defined benefit plan.

+ References

No definition available.

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- Definition

The amount of other comprehensive income, net of tax, resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2024-01-01
-Paragraph 135
-Subparagraph b
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-URIDate 2024-03-27

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- Definition

The amount of other comprehensive income, net of tax, resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions]

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+ Details

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- Definition

The amount of other comprehensive income, net of tax, resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments]

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+ Details

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- Definition

The expense of employee service in the current period arising from defined benefit plans. [Refer: Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase in net defined benefit liability (asset) resulting from current service cost]

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+ Details

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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No definition available.

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- Definition

The amount of other comprehensive income, net of tax, resulting from the gain (loss) on changes in the effect of limiting a net defined benefit asset to the asset ceiling, excluding amounts included in interest income or expense. [Refer:Other comprehensive income, net of tax, gains (losses) on remeasurements of defined benefit plans] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on changes in effect of limiting net defined benefit asset to asset ceiling excluding interest income or expense]

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+ Details

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- Definition

The amount of interest expense arising from defined benefit plans. [Refer: Interest expense; Post-employment benefit expense in profit or loss, defined benefit plans] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)]

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+ Details

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- References

No definition available.

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- Details

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