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Employee benefits (Details Textual)	12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2016
Employee benefits [Line Items]
Key management personnel compensation | $		$ 27,907,000	$ 27,367,000
Weighted average share price | $	$ 54
Executive Compensation Plan [Member]
Employee benefits [Line Items]
Key management personnel compensation | $		$ 3,754,000	$ 6,487,000
Number of shares effected | shares		476,302	533,476
Men [Member]
Employee benefits [Line Items]
Actuarial assumption of retirement age		65	65	65
Men [Member] | Top of range [member]
Employee benefits [Line Items]
Actuarial assumption of retirement age		65
Women [Member]
Employee benefits [Line Items]
Actuarial assumption of retirement age		60	60	60
Women [Member] | Top of range [member]
Employee benefits [Line Items]
Actuarial assumption of retirement age			60

X

- Definition

The retirement age used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 19
-IssueDate 2018-01-01
-Paragraph 144
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X

- Definition

The amount of compensation to key management personnel. [Refer: Key management personnel of entity or parent [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 24
-IssueDate 2018-01-01
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=24&date=2018-03-01&anchor=para_17&doctype=Standard
-URIDate 2018-03-16

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X

- Definition

The weighted average share price. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2018-01-01
-Paragraph 45
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2018-03-01&anchor=para_45_c&doctype=Standard
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- References

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X

- Definition

The number of shares effected in plan.

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No definition available.

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