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SHARE-BASED PAYMENTS - Share-based compensation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Share-based payment transaction
Share-based compensation expense	$ 34.4	$ 30.2
Share options
Share-based payment transaction
Share-based compensation expense	1.0	2.4
Restricted share unit plan
Share-based payment transaction
Share-based compensation expense	29.7	24.6
Deferred share unit plan
Share-based payment transaction
Share-based compensation expense	1.3	1.1
Employee share purchase plan
Share-based payment transaction
Share-based compensation expense	$ 2.4	$ 2.1

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- Definition

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+ References

No definition available.

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- Definition

The amount of expense arising from share-based payment transactions in which the goods or services received did not qualify for recognition as assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2020-01-01
-Paragraph 51
-Subparagraph a
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-URIDate 2020-01-01

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