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Financial instruments - additional disclosures (Details 13) | 12 Months Ended
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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% |

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