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Employee benefit plans - Summary of principal actuarial assumptions (Details)
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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%