Equity-settled share-based payments - Restricted Share and Restricted Stock Unit Plan (Details) - shares	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted shares
Movement of Share-Based Payment Arrangement [Roll Forward]
Balance at beginning of period (shares)	750,000	0
Granted (shares)	751,000	753,000
Forfeited (shares)	(24,000)	(3,000)
Vested (shares)	(255,000)	0
Balance at end of period (shares)	1,222,000	750,000	0
Restricted Stock Units
Movement of Share-Based Payment Arrangement [Roll Forward]
Balance at beginning of period (shares)	508,000	976,000	969,000
Granted (shares)	0	20,000	530,000
Forfeited (shares)	(10,000)	(12,000)	(25,000)
Vested (shares)	(324,000)	(476,000)	(498,000)
Balance at end of period (shares)	174,000	508,000	976,000

Movement of Share-Based Payment Arrangement [Roll Forward]

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- Definition

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard
-URIDate 2020-01-01

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- Definition

The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 45
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45&doctype=Standard
-URIDate 2020-01-01

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- Definition

The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement.

+ References

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- Definition

The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

+ References

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