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Financial instruments and risk management - Interest rate risk - Narrative (Details)
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Disclosure of detailed information about financial instruments [line items]      
Borrowings percentage 100.00%   100.00%
Fixed rate      
Disclosure of detailed information about financial instruments [line items]      
Borrowings percentage 77.00%   70.00%
Minimum | Fixed rate      
Disclosure of detailed information about financial instruments [line items]      
Borrowings percentage 40.00%    
Temporary borrowings percentage 40.00% 40.00%  
Maximum | Fixed rate      
Disclosure of detailed information about financial instruments [line items]      
Borrowings percentage 60.00%    
Temporary borrowings percentage 90.00% 80.00%