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Financial Instruments - Additional Information (Detail) - CAD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about financial instruments [Line Items]
Fair value of unsecured senior notes	$ 1,765.0	$ 1,917.0
Credit Risk [Member]
Disclosure of detailed information about financial instruments [Line Items]
Trade receivables	$ 11.7	$ 8.6

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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.

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- Definition

The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]

+ References

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- Definition

The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

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