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Employee Defined Benefit Obligations - Additional Information (Detail) $ in Millions	12 Months Ended
	Dec. 31, 2019 CAD ($)	Dec. 31, 2018 CAD ($) yr Trustee	Dec. 31, 2017 yr
Disclosure of defined benefit plans [line items]
Number of employer-appointed trustee | Trustee		4
Percentage of plans' assets invested in mutual funds and exchange-traded funds or held in cash		50.00%
Percentage of plans' assets held in annuity policies		25.00%
Weighted average duration of defined benefit obligation | yr		16	15
Defined benefit pension plans contribution [member]
Disclosure of defined benefit plans [line items]
Amount expected to contribute to pension plan by company	$ 23.3
Defined benefit obligation [member]
Disclosure of defined benefit plans [line items]
Past service cost		$ 10.5
Defined benefit obligation [member] | Continuing Operations1[member]
Disclosure of defined benefit plans [line items]
Past service cost		4.7
Defined benefit obligation [member] | Discontinued operations [member]
Disclosure of defined benefit plans [line items]
Past service cost		$ 5.8

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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.

+ Details

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- Definition

The estimate of the expected contributions to be made to a defined benefit plan for the next annual reporting period. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 147
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_147_b&doctype=Standard
-URIDate 2018-03-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 148
-Subparagraph d
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_148_d_iii&doctype=Standard
-URIDate 2018-03-16

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 141
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_141_d&doctype=Standard
-URIDate 2018-03-16

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- Definition

The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2018-01-01
-Paragraph 147
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_147_c&doctype=Standard
-URIDate 2018-03-16

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- Definition

Number of employer appointed trustee.

+ References

No definition available.

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- Definition

Percentage of plan asset in annuity policies.

+ References

No definition available.

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- Definition

Percentage of plan asset in securities or held in cash.

+ References

No definition available.

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