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Significant accounting policies - Property plant and equipment (Details)	12 Months Ended
	Dec. 31, 2017
Bottom of range
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives	10 years
Top of range
Disclosure of detailed information about property, plant and equipment [line items]
Estimated useful lives	25 years

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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.

+ Details

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- Definition

Useful lives or depreciation rates, property, plant and equipment, period

+ References

No definition available.

+ Details

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- Details

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X

- Details

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