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SHARE-BASED PAYMENTS - Share-based compensation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Share-based payment transaction |  |
Share-based compensation expense | $ 30.2 | $ 24.5
Share options |  |
Share-based payment transaction |  |
Share-based compensation expense | 2.4 | 2.7
Restricted share unit plan |  |
Share-based payment transaction |  |
Share-based compensation expense | 24.6 | 18.6
Deferred share unit plan |  |
Share-based payment transaction |  |
Share-based compensation expense | 1.1 | 1.1
Employee share purchase plan |  |
Share-based payment transaction |  |
Share-based compensation expense | $ 2.1 | $ 2.1

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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 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 2019-01-01 -Paragraph 51 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_51_a&doctype=Standard -URIDate 2019-03-27 + Details
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