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Financial instruments - additional disclosures (Details 13)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of major customers [line items]      
Customers with net sales over five percent The Group’s largest, second-largest and third-largest customers account for approximately 17%, 11% and 6% of net sales, respectively (2019: 18%, 13% and 8%, respectively; 2018: 18%, 14% and 8%, respectively). All segments had sales to these customers in 2020, 2019 and 2018. The highest amounts of trade receivables outstanding were for these same three customers and amounted to approximately 14%, 12% and 6%, respectively, of the trade receivables at December 31, 2020 (2019: 14%, 12% and 7%, respectively).    
Largest customer [member]      
Disclosure of major customers [line items]      
Percentage of entity's revenue 17.00% 18.00% 18.00%
Percentage of entitys trade receivable 14.00% 14.00%  
Second largest customer [member]      
Disclosure of major customers [line items]      
Percentage of entity's revenue 11.00% 13.00% 14.00%
Percentage of entitys trade receivable 12.00% 12.00%  
Third largest customer [member]      
Disclosure of major customers [line items]      
Percentage of entity's revenue 6.00% 8.00% 8.00%
Percentage of entitys trade receivable 6.00% 7.00%