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Performance B.4.1. Share-based compensation - Narrative (Details) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Apr. 01, 2015 shares | Dec. 31, 2018 | Dec. 31, 2015 plan shares | Dec. 31, 2016 plan | Dec. 31, 2014 plan
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Number of plans | plan |  |  | 4 | 2 | 2
Deferred share plans |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
Deferred share plans | Tranche One |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting percentage |  | 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 |  | 67.00% |  |  |
2015 CEO Plan |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Number of shares granted (in shares) | 77,344 |  |  |  |
2015 Performance Plan |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Fulfillment expectation |  | 100.00% |  |  |
2015 Performance Plan | Tranche One |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting percentage |  | 62.50% |  |  |
2015 Performance Plan | Tranche Two |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting percentage |  | 37.50% |  |  |
2015 Executive Plan |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
Fulfillment expectation |  | 100.00% |  |  |
2015 Executive Plan - CEO |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Number of shares granted (in shares) |  |  | 26,664 |  |
Shares in entity held by entity executive |  |  | 3,333 |  |
2015 Executive Plan - CFO |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Number of shares granted (in shares) |  |  | 14,000 |  |
Shares in entity held by entity executive |  |  | 2,000 |  |
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% |  |  |
2016 Performance Plan |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting period |  | 3 years |  |  |
2016 Performance Plan | Tranche One |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |
2016 Performance Plan | Tranche Two |  |  |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |  |  |
Vesting percentage |  | 25.00% |  |  |
2016 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% |  |  |

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