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Financial instruments - fair values and risk management - Sensitivity analysis (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2021
EUR (€)
Jun. 30, 2021
RUB (₽)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
RUB (₽)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
RUB (₽)
Dec. 31, 2019
USD ($)
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, entity's own equity instruments [line items]                  
Strengthening of USD by 10%       10.00% 10.00% 10.00% 10.00% 10.00% 10.00%
Weakening of USD by 10%       10.00% 10.00% 10.00% 10.00% 10.00% 10.00%
Currency risk                  
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, entity's own equity instruments [line items]                  
Strengthening of USD by 10% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%      
Increase (decrease) in equity and profit or loss due to strengthening of USD by 10% | $     $ (2,896)     $ (1,749)     $ (1,577)
Weakening of USD by 10% 10.00% 10.00% 10.00% 10.00% 10.00% 10.00%      
Increase (decrease) in equity and profit or loss due to weakening of USD by 10% | $     $ 2,896     $ 1,749     $ 1,577
Euro | Currency risk                  
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, entity's own equity instruments [line items]                  
Increase (decrease) in equity and profit or loss due to strengthening of USD by 10% | € € (2,703)     € (1,410)     € (1,323)    
Increase (decrease) in equity and profit or loss due to weakening of USD by 10% | € € 2,703     € 1,410     € 1,323    
Russian Ruble | Currency risk                  
Disclosure of sensitivity analysis of fair value measurement to changes in unobservable inputs, entity's own equity instruments [line items]                  
Increase (decrease) in equity and profit or loss due to strengthening of USD by 10% | ₽   ₽ (193)     ₽ (339)     ₽ (254)  
Increase (decrease) in equity and profit or loss due to weakening of USD by 10% | ₽   ₽ 193     ₽ 339     ₽ 254