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Fair Value Measurements - Summary of Fair Value Hierarchy for Assets (Detail) - CAD CAD in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of fair value measurement of assets [line items]
Other financial assets	CAD 195.4	CAD 181.0
Investments held for self-insured liabilities [member]
Disclosure of fair value measurement of assets [line items]
Other financial assets	147.1	CAD 141.1
Recurring fair value measurement [member] | Investments held for self-insured liabilities [member]
Disclosure of fair value measurement of assets [line items]
Other financial assets	147.1
Recurring fair value measurement [member] | Significant other observable inputs [member] | Investments held for self-insured liabilities [member]
Disclosure of fair value measurement of assets [line items]
Other financial assets	CAD 147.1

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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 amount of financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 54
-Subparagraph d
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-URIDate 2017-03-09

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