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Common Shares - Shareholder Rights Plan (Details) - Shareholder Rights Plan - Common shares	12 Months Ended
	Dec. 31, 2018 CAD ($)
Disclosure of classes of share capital [line items]
Value of common shares received under Shareholder Rights Plan	$ 200
Purchase price of common shares under Shareholder Rights Plan	$ 100
Minimum
Disclosure of classes of share capital [line items]
Percentage of outstanding common shares at which Shareholder Rights Plan may take effect	20.00%

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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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- Definition

Purchase Price Of Common Shares Under Shareholder Rights Plan

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- Definition

Shareholder Rights Plan, Percentage Of Outstanding Common Shares Potentially Purchased At Which Shareholder Rights Are Exercisable

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- Definition

Value Of Common Shares Received Under Shareholder Rights Plan

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