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Share-based compensation expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation expenses (note 14)	$ 11.2	$ 9.6
Stock options and restricted share units
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation expenses (note 14)	8.0	5.6
Deferred Share Units
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation expenses (note 14)	$ 3.2	$ 4.0

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- Definition

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.

+ References

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
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2021-03-24

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- Details

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