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Net Employee Defined Benefit Liability - Summary of Major Categories of Plan Assets, Measured at Fair Value (Detail) - CAD CAD in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value of plan assets [Line Items]
Cash and cash equivalents	CAD 2.9	CAD 8.8
Fair Value of the plan assets	379.2	324.1
Quoted prices in active markets for identical items [member]
Disclosure of fair value of plan assets [Line Items]
Corporate bonds and fixed income	45.0	36.1
Equities	110.1	80.8
Property funds	6.6	8.0
Unquoted investment [member]
Disclosure of fair value of plan assets [Line Items]
Annuity policies	102.9	90.5
Equities and property	69.5	59.0
Corporate bonds and fixed income	22.7	19.1
Cash and cash equivalents	CAD 19.5	CAD 21.8

X

- Definition

The amount that cash and cash equivalents constitute of the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]]

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The amount that instruments representing debt (rather than equity) constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

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The amount that investment funds constitute of the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]; Investment funds [member]]

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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Annuity policies amount contributed to fair value of plan assets.

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