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Events after the balance sheet date - Narrative (Details)	Nov. 26, 2018
China National
Entity Information [Line Items]
Ownership interest in joint venture disposed (as a percent)	68.62%

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- Definition

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

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No definition available.

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- Definition

Proportion of ownership interest in joint Venture disposed.

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No definition available.

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- Details

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