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Significant accounting policies and new and not yet effective accounting standards (Details)
 12 Months Ended
Dec. 31, 2022
Property, buildings and leasehold improvements [member] | Minimum [member]  
Property, Plant and Equipment  
Estimated useful lives (in years) 5 years
Property, buildings and leasehold improvements [member] | Maximum [member]  
Property, Plant and Equipment  
Estimated useful lives (in years) 20 years
IT equipment [member] | Minimum [member]  
Property, Plant and Equipment  
Estimated useful lives (in years) 3 years
IT equipment [member] | Maximum [member]  
Property, Plant and Equipment  
Estimated useful lives (in years) 10 years
Furniture, equipment and fittings [member] | Minimum [member]  
Property, Plant and Equipment  
Estimated useful lives (in years) 3 years
Furniture, equipment and fittings [member] | Maximum [member]  
Property, Plant and Equipment  
Estimated useful lives (in years) 10 years
Right of use assets [member] | Minimum [member]  
Property, Plant and Equipment  
Estimated useful lives (in years) 3 years
Right of use assets [member] | Maximum [member]  
Property, Plant and Equipment  
Estimated useful lives (in years) 15 years