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SHARE CAPITAL - Additional information (Details) $ / shares in Units, $ in Millions, $ in Millions			1 Months Ended	12 Months Ended
	Aug. 30, 2019 CAD ($) $ / shares shares	Aug. 30, 2019 USD ($) shares	Mar. 31, 2017 USD ($)	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)
SHARE CAPITAL
Deferred tax expense (income)			$ 1.9	$ (3.0)	$ (14.5)
Issuance of common shares | shares	93,750,000	93,750,000		93,750,000
Shares issued in equity offering, price per share | $ / shares	$ 1.60
Net proceeds on equity offering		$ 106.7		$ 106.7	0.0
Gross proceeds on equity offering	$ 150.0
Share-based payment expenses recognized in operating expenses				$ 1.0	$ 0.0

X

- Definition

The amount of tax expense (income) relating to changes in deferred tax liabilities and deferred tax assets. [Refer: Deferred tax assets; Deferred tax liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2019-01-01
-Paragraph 81
-Subparagraph g
-Clause ii
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X

- References

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X

- Definition

The cash inflow from the issuing of ordinary shares. [Refer: Ordinary shares [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2019-01-01
-Paragraph 17
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-URIDate 2019-03-27

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- Definition

The gross proceeds from the issuing of ordinary shares.

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- Definition

Number of new stock issued during the period.

+ References

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- Definition

Amount of share based compensation expenses recognized in operating expenses.

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- Definition

Per share price of new stock issued during the period.

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