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Share-based compensation expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation expenses (note 12)	$ 5.0	$ 6.8	$ 7.0	$ 8.1
Stock options and restricted share units
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation expenses (note 12)	1.6	1.3	3.0	2.5
Deferred Share Units
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share-based compensation expenses (note 12)	$ 3.4	$ 5.5	$ 4.0	$ 5.6

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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 expense from share-based payment transactions with employees.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
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-URIDate 2020-01-01

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- Details

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