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Pensions - Actuarial assumptions (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Weighted-average duration of the defined benefit obligation | 15 years 2 months 12 days | 15 years 7 months 6 days
Description of Expected attrition | Expected attrition at 31 December 2021 was 0.3% and 3.9% for employees between 50-59 years and 60-67 years, and 0.3% and 3.6% in 2020. The attrition rate for the age group 60-67 years represents employees with immediate withdrawal of vested pension, thus remaining in the scheme. |
Employee age group (50-59 years) [Member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Expected attrition rate of employees | 0.30% | 0.30%
Employee age group (60-67 years) [Member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Expected attrition rate of employees | 3.90% | 3.60%
Discount rate [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Assumptions used to determine benefit costs | 1.75% | 2.25%
Percentage Actuarial Assumption To Determine Defined Benefit Obligations | 2.00% | 1.75%
Rate of compensation increase [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Assumptions used to determine benefit costs | 2.00% | 2.25%
Percentage Actuarial Assumption To Determine Defined Benefit Obligations | 2.50% | 2.00%
Expected rate of pension increase [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Assumptions used to determine benefit costs | 1.25% | 1.50%
Percentage Actuarial Assumption To Determine Defined Benefit Obligations | 1.75% | 1.25%
Expected increase of social security base amount (G-amount) [member] |  |
Disclosure of sensitivity analysis for actuarial assumptions [line items] |  |
Assumptions used to determine benefit costs | 2.00% | 2.25%
Percentage Actuarial Assumption To Determine Defined Benefit Obligations | 2.25% | 2.00%

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- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 147 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_147_c&doctype=Standard -URIDate 2021-03-24 + Details
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