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Share-based compensation - Range of exercise prices in stock options (Details) | Dec. 31, 2017 USD ($) year shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares
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Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Weighted average remaining contractual life (years) | year | 3.58 |  |
Number of stock options outstanding | shares | 262,535 | 344,767 | 448,507
Weighted average exercise price (in usd per option) | $ 45.09 | $ 40.91 | $ 30.52
Number of stock options exercisable | shares | 175,360 |  |
Weighted average exercise price (in usd per option) | $ 45.88 |  |
$25.97 to $35.51 |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Weighted average remaining contractual life (years) | year | 3.40 |  |
Number of stock options outstanding | shares | 103,850 |  |
Weighted average exercise price (in usd per option) | $ 33.08 |  |
Number of stock options exercisable | shares | 60,980 |  |
Weighted average exercise price (in usd per option) | $ 32.02 |  |
$25.97 to $35.51 | Minimum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 25.97 |  |
$25.97 to $35.51 | Maximum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 35.51 |  |
$38.24 to $73.13 |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Weighted average remaining contractual life (years) | year | 3.69 |  |
Number of stock options outstanding | shares | 158,685 |  |
Weighted average exercise price (in usd per option) | $ 52.95 |  |
Number of stock options exercisable | shares | 114,380 |  |
Weighted average exercise price (in usd per option) | $ 53.28 |  |
$38.24 to $73.13 | Minimum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 38.24 |  |
$38.24 to $73.13 | Maximum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 73.13 |  |

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