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Employee benefit plans - Summary of principal actuarial assumptions (Details) | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Greece | Employee benefit plans |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Expected return on plan assets | 0.00% | 0.00% |
Discount rate - beginning of year | 1.00% | 0.40% | 0.90%
Discount rate - end of year | 1.00% | 0.40% | 0.90%
Rate of salary escalation | 1.70% | 1.70% |
Turkey | Employee benefit plans |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Expected return on plan assets | 0.00% | 0.00% |
Discount rate - beginning of year | 19.00% | 12.80% | 13.00%
Discount rate - end of year | 19.00% | 12.80% | 13.00%
Rate of salary escalation | 15.00% | 8.50% |
Canada | Employee benefit plans |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Expected return on plan assets |  | 3.10% |
Discount rate - beginning of year |  | 0.00% | 3.10%
Discount rate - end of year |  | 0.00% | 3.10%
Rate of salary escalation |  | 0.00% |
Canada | SERP |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Expected return on plan assets |  | 3.10% |
Discount rate - beginning of year |  | 3.10% |
Discount rate - end of year |  | 3.10% |
Rate of salary escalation |  | 0.00% |

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- Definition Actuarial assumption of expected return on plan assets. + References No definition available. + Details
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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_144&doctype=Standard -URIDate 2021-03-24 + 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. + References No definition available. + Details
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