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SHARE-BASED PAYMENTS - Share-based compensation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Share-based payment transaction |  |
Share-based compensation expense | $ 24.5 | $ 29.0
Share options |  |
Share-based payment transaction |  |
Share-based compensation expense | 2.7 | 2.4
Restricted share unit plan |  |
Share-based payment transaction |  |
Share-based compensation expense | 18.6 | 23.4
DSUs |  |
Share-based payment transaction |  |
Share-based compensation expense | 1.1 | 1.2
ESPP |  |
Share-based payment transaction |  |
Share-based compensation expense | $ 2.1 | $ 2.0

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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 Represents the expense recognised during the period arising from share based payments. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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