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Share capital - Treasury shares (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2015
Disclosure of classes of share capital [line items] |  |  |  |
Beginning balance | $ 141,900,000 | $ 169,700,000 | $ 175,400,000 |
Purchase of own shares |  | (6,300,000) | (1,900,000) |
Ending balance | $ 162,300,000 | $ 141,900,000 | 169,700,000 |
Authorized stock repurchase amount |  |  |  | $ 10,000,000
Authorized stock repurchase, number of shares |  |  |  | 2,700,000
Number of shares repurchased | 0 | 634,185 |  |
Number of treasury shares held | 527,616 | 665,424 |  |
Treasury shares |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |
Beginning balance | $ (7,100,000) | $ (1,300,000) | 0 |
Purchase of own shares | 800,000 | (6,300,000) | (1,900,000) |
Utilization of treasury shares | 500,000 | 500,000 | 600,000 |
Ending balance | $ (5,800,000) | $ (7,100,000) | $ (1,300,000) |

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