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Financial risk management objectives and policies (Details) | Dec. 31, 2017 | Dec. 31, 2016
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Disclosure of detailed information about financial instruments [line items] |  |
Borrowings, Percentage Bearing Fixed Interest, Percentage Rate | 0.00% | 31.00%
Net debt to adjusted book capitalisation plus net debt ratio | 76.00% | 164.00%
Minimum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net debt to adjusted book capitalisation plus net debt ratio | 60.00% |
Maximum |  |
Disclosure of detailed information about financial instruments [line items] |  |
Net debt to adjusted book capitalisation plus net debt ratio | 80.00% |

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