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Share-based payments - Movement in PSUs (Details) |  | 6 Months Ended
--- | --- | ---
Apr. 30, 2018 USD ($) shares | Jun. 30, 2018 shares | Jun. 30, 2017 shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding at January 1, (in shares) |  | 1,610,894 | 1,145,238
Granted during the period (in shares) |  | 943 | 0
Forfeited during the period (in shares) |  | (19,759) | (5,756)
Vested during the period (in shares) |  | (447,122) | 0
Outstanding at June 30, (in shares) |  | 1,144,956 | 1,139,482
2015 Plan |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding at January 1, (in shares) |  | 452,816 | 454,959
Granted during the period (in shares) |  | 0 | 0
Forfeited during the period (in shares) |  | (5,694) | (1,515)
Vested during the period (in shares) | 380,436 | (447,122) | 0
Outstanding at June 30, (in shares) |  | 0 | 453,444
Number of shares issued through share-based payment transactions, new shares (in shares) | 400,453 |  |
Number of shares issued through share-based payment transactions, treasury shares (in shares) | 1,284 |  |
Weighted average fair value at measurement date, other equity instruments settled (in dollars per share) | $ | $ 26.80 |  |
2016 Plan |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding at January 1, (in shares) |  | 686,038 | 690,279
Granted during the period (in shares) |  | 113 | 0
Forfeited during the period (in shares) |  | (8,544) | (4,241)
Vested during the period (in shares) |  | 0 | 0
Outstanding at June 30, (in shares) |  | 677,607 | 686,038
2017 Plan |  |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |  |
Outstanding at January 1, (in shares) |  | 472,040 |
Granted during the period (in shares) |  | 830 |
Forfeited during the period (in shares) |  | (5,521) |
Vested during the period (in shares) |  | 0 |
Outstanding at June 30, (in shares) |  | 467,349 | 0

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