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Convertible Unsecured Subordinated Debentures - Schedule of Debt (Details)	12 Months Ended
	Dec. 31, 2017 CAD	Dec. 31, 2016 CAD	Dec. 31, 2017 $ / shares	Mar. 14, 2017	Mar. 01, 2016 CAD
Debt Instrument [Line Items]
Maturity date				2.33%
Convertible Subordinated Debt | Convertible Unsecured Subordinated Debentures
Debt Instrument [Line Items]
Maturity date	5.00%				5.00%
Conversion price (CAD per share) | $ / shares			$ 10.60
Convertible Unsecured Subordinated Debentures [Roll Forward]
Carrying value at December 31, 2016	CAD 358,619,000
Receipt of Final instalment, net of deferred financing costs	743,881,000	CAD 357,694,000
Amortization of deferred financing costs	1,134,000	925,000
Conversion to common shares	(1,102,416,000)
Carrying value at December 31, 2017	1,218,000	CAD 358,619,000
Par value	CAD 1,277,000				CAD 1,150,000,000

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Debt Rollforward [Roll Forward]

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Amount of amortization expense attributable to debt issuance costs.

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The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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The price per share of the conversion feature embedded in the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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