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Performance B.4.1. Share-based compensation - Narrative (Details) - plan | 12 Months Ended |
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Number of plans |  |  | 2
Deferred share plans |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 3 years | 3 years |
Deferred share plans | Tranche One |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting percentage | 30.00% | 16.50% |
Deferred share plans | Tranche Two |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting percentage | 16.50% |  |
Deferred share plans | Tranche Three |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting percentage | 40.00% | 67.00% |
2017 Performance Plan |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 3 years |  |
2017 Performance Plan | Tranche One |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting percentage | 25.00% |  |
2017 Performance Plan | Tranche Two |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting percentage | 25.00% |  |
2017 Performance Plan | Tranche Three |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting percentage | 50.00% |  |
2018 Performance Plan |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 3 years |  |
2018 Performance Plan | Tranche One |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting percentage | 25.00% |  |
2018 Performance Plan | Tranche Two |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting percentage | 25.00% |  |
2018 Performance Plan | Tranche Three |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting percentage | 50.00% |  |
Performance Share Plan 2016 And 2017 |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting period | 3 years |  |
Fulfillment expectation | 100.00% |  |
Performance Share Plan 2016 And 2017 | Tranche One |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting percentage | 25.00% |  |
Performance Share Plan 2016 And 2017 | Tranche Two |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting percentage | 25.00% |  |
Performance Share Plan 2016 And 2017 | Tranche Three |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Vesting percentage | 50.00% |  |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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