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Revenue and segmental analysis - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2017 segment
Disclosure of entity's operating segments [Abstract] |
Number of reportable segments | 2
Number of operating segments | 6

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- Definition Number Of Operating Segments1 + References No definition available. + Details
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- Definition Number Of Reportable Segments1 + References No definition available. + Details
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