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Retirement benefits - Defined Benefit Plans - Sensitivity Analysis of Actuarial Assumptions (Detail) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Discount 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 | $ 3.2
Increase in liabilities | $ (3.2)
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 | $ (1.4)
Increase in liabilities | $ 1.4
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 | $ 5.7
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 | $ (1.6)
Increase in liabilities | $ 1.7

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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 2020-01-01 -Paragraph 145 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_b&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_a&doctype=Standard -URIDate 2020-01-01 + 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 2020-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2020-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2020-en-r&anchor=para_145_a&doctype=Standard -URIDate 2020-01-01 + Details
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