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Financial risk management objectives and policies (Details)	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]
Borrowings, Percentage Bearing Fixed Interest, Percentage Rate	6.00%	0.00%
Net debt to adjusted book capitalisation plus net debt ratio	73.00%	76.00%
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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- Definition

The percentage of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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- Definition

The net debt to adjusted book capitalisation plus net debt ratio.

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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