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v3.19.1

Significant accounting policies, estimates and judgements (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
U.S. Dollar [Member] |  |  |
Average foreign exchange rate | 1.18 | 1.13 | 1.11
Closing foreign exchange rate | 1.15 | 1.20 | 1.05
Pound Sterling [Member] |  |  |
Average foreign exchange rate | 0.88 | 0.88 | 0.82
Closing foreign exchange rate | 0.89 | 0.88 | 0.86
Norwegian Krone [Member] |  |  |
Average foreign exchange rate | 9.60 | 9.33 | 9.29
Closing foreign exchange rate | 9.94 | 9.83 | 9.09
Australian Dollar [Member] |  |  |
Average foreign exchange rate | 1.58 | 1.47 | 1.49
Closing foreign exchange rate | 1.62 | 1.53 | 1.46

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