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Share-based compensation - Range of exercise prices in stock options (Details) | Dec. 31, 2018 USD ($) year shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 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 | 3.54 |  |
Number of stock options outstanding | shares | 198,221 | 262,535 | 344,767
Weighted average exercise price (in usd per option) | $ 48.55 | $ 45.09 | $ 40.91
Number of stock options exercisable | shares | 137,282 |  |
Weighted average exercise price (in usd per option) | $ 49.46 |  |
$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 | 3.98 |  |
Number of stock options outstanding | shares | 56,467 |  |
Weighted average exercise price (in usd per option) | $ 34.45 |  |
Number of stock options exercisable | shares | 35,831 |  |
Weighted average exercise price (in usd per option) | $ 34.37 |  |
$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 $50.17 |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Weighted average remaining contractual life (years) | year | 3.01 |  |
Number of stock options outstanding | shares | 57,754 |  |
Weighted average exercise price (in usd per option) | $ 43.70 |  |
Number of stock options exercisable | shares | 39,351 |  |
Weighted average exercise price (in usd per option) | $ 40.67 |  |
$38.24 to $50.17 | Minimum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 38.24 |  |
$38.24 to $50.17 | Maximum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 50.17 |  |
$54.65 to $78.59 |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |
Weighted average remaining contractual life (years) | year | 3.61 |  |
Number of stock options outstanding | shares | 84,000 |  |
Weighted average exercise price (in usd per option) | $ 61.37 |  |
Number of stock options exercisable | shares | 62,100 |  |
Weighted average exercise price (in usd per option) | $ 63.74 |  |
$54.65 to $78.59 | Minimum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | 54.65 |  |
$54.65 to $78.59 | Maximum |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Exercise price of outstanding share options | $ 78.59 |  |

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