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Shareholders' equity - Restricted stock unit (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) EquityInstruments shares	Dec. 31, 2016 USD ($) EquityInstruments
Bottom
Stock-based payments
Target settlement range 0% to 100%	0.00%
Top
Stock-based payments
Target settlement range 0% to 100%	100.00%
Restricted Share Units
Stock-based payments
Number of shares for each RSU vests | shares	1
Fair value of RSUs granted	$ 3.3	$ 2.9
Number of trading days immediately preceding the date of conversion or award grant for determining fair value	5 days
Stock-based compensation expenses	$ 1.5	2.7
Capitalised to royalty, stream and working interest	0.3	0.3
Total unrecognized non-cash stock-based compensation expense	$ 5.3	$ 4.1
Expected to be recognized over weighted average period	1 year 6 months	1 year 6 months
Performance based RSU
Stock-based payments
Vesting period	3 years
Granted | EquityInstruments	21,095	25,611
Time-based RSU
Stock-based payments
Vesting period	3 years
Granted | EquityInstruments	20,745	25,164

X

- Definition

The amount of expense arising from share-based payment transactions in which the goods or services received are capitalized to royalty, stream and working interest, net.

+ References

No definition available.

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X

- Definition

The amount of unrecognised expense arising from share-based payment transactions in which the goods or services received did not qualify for recognition as assets.

+ References

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- Definition

The number of shares for each other equity instruments vest.

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- Definition

The number of trading days immediately preceding the date of conversion or award grant for determining fair value.

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- Definition

The percentage of performance and target settlement in share based payment.

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- Definition

The vesting life of awards in a share-based payment arrangement.

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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
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- Definition

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

+ References

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- Definition

The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]]

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