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Fair value measurement - Quantitative information about the significant unobservable inputs used in level 3 fair value measurements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]
Contingent consideration liability at fair value	$ 22,100	$ 16,410	$ 15,755	$ 17,570
Expected revenues annual average [member]
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]
Contingent consideration liability at fair value	$ 222,238
Possible increase in unobservable input, liabilities	10.00%
Possible decrease in unobservable input, liabilities	10.00%
Amount of increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities	$ 2,200
Amount of increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, liabilities	2,200
Contingent consideration [member] | At fair value [member] | Rate before tax [member]
Disclosure of significant unobservable inputs used in fair value measurement of liabilities [line items]
Contingent consideration liability at fair value	$ 22,100
Range of inputs	9.30
Percentage of reasonably possible increase in unobservable input, liabilities	10.00%
Percentage of reasonably possible decrease in unobservable input, liabilities	0.93%
Amount of increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input, liabilities	$ 1,500
Amount of increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input, liabilities	$ 1,500

X

- Definition

The decremental percentage of unobservable input used in fair value measurement of liabilities.

+ References

No definition available.

+ Details

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- Definition

The incremental percentage of unobservable input used in fair value measurement of liabilities.

+ References

No definition available.

+ Details

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X

- Definition

The amount of contingent liabilities recognised in a business combination. [Refer: Contingent liabilities [member]; Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2020-01-01
-Paragraph B67
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2020-en-r&anchor=para_B67_c&doctype=Appendix&subtype=B
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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

The amount of increase (decrease) in the fair value measurement of liabilities due to a reasonably possible decrease in an unobservable input.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2020-01-01
-Paragraph 93
-Subparagraph h
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_h_ii&doctype=Standard
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- Definition

The amount of increase (decrease) in the fair value measurement of liabilities due to a reasonably possible increase in an unobservable input.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2020-01-01
-Paragraph 93
-Subparagraph h
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_h_ii&doctype=Standard
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- Definition

The percentage of a reasonably possible decrease in an unobservable input used in fair value measurement of liabilities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 13
-IssueDate 2020-01-01
-Paragraph 93
-Subparagraph h
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_h_ii&doctype=Standard
-URIDate 2020-01-01

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- Definition

The percentage of a reasonably possible increase in an unobservable input used in fair value measurement of liabilities.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 13
-IssueDate 2020-01-01
-Paragraph 93
-Subparagraph h
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_h_ii&doctype=Standard
-URIDate 2020-01-01

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- Definition

The value of significant unobservable input used in the measurement of the fair value of liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2020-01-01
-Paragraph 93
-Subparagraph d
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-URIDate 2020-01-01

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