Significant accounting policies - Deferred share units and Restricted share units (Details)	12 Months Ended
Dec. 31, 2018 shares
Deferred Share Units
Significant accounting policies
Number of trading days immediately preceding grant date for determining fair value	5 days
Restricted Share Units
Significant accounting policies
The number of trading days immediately preceding the date of the conversion award	5 days
The number of shares exchanged for each RSU	1
Time-based RSU
Significant accounting policies
Vesting period	3 years
Performance based RSU
Significant accounting policies
Vesting period	3 years
Bottom
Significant accounting policies
Target settlement range 0% to 100%	0.00%
Top
Significant accounting policies
Target settlement range 0% to 100%	100.00%

The number of shares for each other equity instruments vest.

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

The number of trading days immediately preceding grant date of grant for determining fair value.

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

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No definition available.

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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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