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Segmentation of key figures (Details 6)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
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 16%, 11% and 7% of net sales to third parties, respectively (2021: 17%, 11% and 6%, respectively; 2020: 17%, 11% and 6%, respectively). All segments had sales to these customers in 2022, 2021 and 2020. The highest amounts of trade receivables outstanding were for these same three customers and amounted to approximately 16%, 14% and 7%, respectively, of the trade receivables at December 31, 2022 (2021: 16%, 12% and 7%, respectively).    
Largest customer [member]      
Disclosure of major customers [line items]      
Percentage of entity's revenue 16.00% 17.00% 17.00%
Percentage of entitys trade receivable 16.00% 16.00%  
Second largest customer [member]      
Disclosure of major customers [line items]      
Percentage of entity's revenue 11.00% 11.00% 11.00%
Percentage of entitys trade receivable 14.00% 12.00%  
Third largest customer [member]      
Disclosure of major customers [line items]      
Percentage of entity's revenue 7.00% 6.00% 6.00%
Percentage of entitys trade receivable 7.00% 7.00%