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Shareholders' equity - Share Purchase Warrants and Deferred share unit plan (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) CAD / shares	Dec. 31, 2017 USD ($) EquityInstruments shares	Dec. 31, 2016 USD ($) EquityInstruments shares
Stock-based payments
Proceeds from exercise of warrants | $		$ 356.4
Share Purchase Warrants
Stock-based payments
Warrants outstanding, beginning of the year		6,510,280	6,510,769
Exercised		(6,388,528)	(489)
Forfeited		(121,752)
Warrants outstanding, end of the year			6,510,280
Warrants exercise price | CAD / shares	CAD 75.00
Proceeds from exercise of warrants | $		$ 356.4
Common shares issued from exercise of stock warrants		6,388,528
DSU plan
Stock-based payments
Granted | EquityInstruments		19,632	19,209
DSU liability | $	CAD 6.7	$ 6.7	$ 3.8
Mark-to-market adjustments | $		$ 1.6	$ 0.2

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Adjustments for mark-to-market expenses.

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The exercise price of warrants.

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The increase (decrease) in the number of shares through exercise of warrants.

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The number of warrants exercised.

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The number of warrants forfeited.

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The number of warrants issued outstanding.

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The cash inflow from exercise of warrants.

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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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The amount of liabilities arising from share-based payment transactions. Share-based payment transactions are transactions in which the entity: (a) receives goods or services from the supplier of those goods or services (including an employee) in a share-based payment arrangement; or (b) incurs an obligation to settle the transaction with the supplier in a share-based payment arrangement when another group entity receives those goods or services. [Refer: Share-based payment arrangements [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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