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Accounting Policies - Investments in Associates and Joint Ventures (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
UHI
Disclosure of associates
Ownership interest	10.00%	10.00%

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- Definition

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.

+ References

No definition available.

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- Definition

The proportion of ownership interest in an associate attributable to the entity. [Refer: Associates [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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