Share-based compensation - VRS 2019 narrative (Details) - USD ($)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
2019 VRSUP
Disclosure of terms and conditions of share-based payment arrangement [line items]
Expense from share-based payment transactions with employees	$ 1,300,000	$ 6,400,000
Equity Settled Restricted Stock Units [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Fair value, RSUs	19.01
Cash Settled Restricted Stock Units [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Fair value, RSUs	$ 5.70

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

No definition available.

+ Details

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- Definition

The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-URIDate 2021-03-24

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- Definition

The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-IssueDate 2021-01-01
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-URIDate 2021-03-24

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