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Retirement benefits - Defined Benefit Plans - Sensitivity Analysis of Actuarial Assumptions (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | [1]
Discount rate [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Percentage of reasonably possible decrease in actuarial assumption | 1.00% |
Percentage of reasonably possible increase in actuarial assumption | 1.00% |
Decrease in liabilities | $ 6.6 | $ 11.4
Increase in liabilities | $ (5.4) | (11.2)
Inflation rate [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Percentage of reasonably possible decrease in actuarial assumption | 0.25% |
Percentage of reasonably possible increase in actuarial assumption | 0.25% |
Decrease in liabilities | $ (0.5) | (1.2)
Increase in liabilities | $ 0.6 | 1.3
Mortality rate [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Year of reasonably possible increase in actuarial assumption | One-year |
Increase in liabilities | $ 2.5 | 5.1
Healthcare costs trend rate [Member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Percentage of reasonably possible decrease in actuarial assumption | 1.00% |
Percentage of reasonably possible increase in actuarial assumption | 1.00% |
Decrease in liabilities | $ (0.8) | (1.2)
Increase in liabilities | $ 0.8 | $ 1.3
[1] | 2021 sensitivities have been re-presented to show the effect of a 1% change in discount rate, consistent with 2022.

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- Definition The description of the methods and assumptions used when preparing a sensitivity analysis for significant actuarial assumptions. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_b&doctype=Standard -URIDate 2022-03-24 + Details
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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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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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 [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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