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Employee Defined Benefit Obligations - Summary of Major Categories of Plan Assets, Measured at Fair Value (Details) - CAD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disclosure of fair value of plan assets [Line Items]
Cash and cash equivalents	$ 9.6	$ 7.6
Fair value of plan assets	575.2	519.3
Level 1
Disclosure of fair value of plan assets [Line Items]
Equities	149.1	163.4
Corporate bonds and fixed income	130.6	73.3
Pooled fund liability-driven investments	21.2	13.2
Property funds	10.1	14.4
Level 2 and 3 of fair value hierarchy
Disclosure of fair value of plan assets [Line Items]
Cash and cash equivalents	0.9	9.3
Corporate bonds and fixed income	41.2	29.9
Annuity policies	127.0	123.2
Equities and property	$ 85.5	$ 85.0

X

- Definition

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

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

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The amount investment funds contribute to 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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Equity instruments and property amount contributed to fair value of plan assets.

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Pooled fund liability driven investments amount contributed to fair value of plan assets.

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