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Retirement benefits - Sensitivity Analysis for Actuarial Assumptions (Details) | 12 Months Ended
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Dec. 31, 2017
Discount rate |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Percentage of reasonably possible increase in actuarial assumption | 1.00%
Percentage of impact on total defined benefit obligations due to increase in actuarial assumption | 19.00%
Percentage of reasonably possible decrease in actuarial assumption | 1.00%
Percentage of impact on total defined benefit obligations due to decrease in actuarial assumption | 19.00%
CPI inflation (and related increases) |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Percentage of reasonably possible increase in actuarial assumption | 1.00%
Percentage of impact on total defined benefit obligations due to increase in actuarial assumption | 9.00%
Percentage of reasonably possible decrease in actuarial assumption | 1.00%
Percentage of impact on total defined benefit obligations due to decrease in actuarial assumption | 9.00%
Post retirement mortality |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |
Percentage of reasonably possible increase in actuarial assumption | 3.00%
Percentage of reasonably possible decrease in actuarial assumption | 3.00%
Duration of reasonably possible increase in actuarial assumption | 1 year
Duration of reasonably possible decrease in actuarial assumption | 1 year

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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 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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