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SHARE-BASED PAYMENTS - Share-based compensation (Details) - USD ($) $ in Millions	12 Months Ended
	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.

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- Definition

Represents the expense recognised during the period arising from share based payments.

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No definition available.

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