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Exchange rates in US$ (Tables) | 12 Months Ended
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Dec. 31, 2018
Foreign Exchange Rates [Abstract] |
Summary of principal exchange rate used in preparation of financial statements | The principal exchange rates used in the preparation of the 2018 financial statements were:
|  | Full-year average |  | Year-end |
|  |  | 2018 |  |  | 2017 |  |  | 2016 |  |  | 2018 |  |  | 2017 |  |  | 2016 |
Sterling |  |  | 1.34 |  |  | 1.29 |  |  | 1.36 |  |  | 1.27 |  |  | 1.34 |  |  | 1.22 |
Australian dollar |  |  | 0.75 |  |  | 0.77 |  |  | 0.74 |  |  | 0.70 |  |  | 0.78 |  |  | 0.72 |
Canadian dollar |  |  | 0.77 |  |  | 0.77 |  |  | 0.76 |  |  | 0.73 |  |  | 0.79 |  |  | 0.74 |
Euro |  |  | 1.18 |  |  | 1.13 |  |  | 1.11 |  |  | 1.14 |  |  | 1.20 |  |  | 1.05 |
South African rand |  |  | 0.076 |  |  | 0.075 |  |  | 0.068 |  |  | 0.069 |  |  | 0.081 |  |  | 0.073 |

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- Definition Disclosure of detailed information about effect of changes in foreign exchange rates explanatory. + References No definition available. + Details
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