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Fair Value Measurements - Summary of Fair Value Hierarchy for Assets (Detail) - CAD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Disclosure of fair value measurement of assets and liabilities [line items]
Investments held for self-insured liabilities	$ 153.0	$ 144.2
Recurring fair value measurement [member] | Investments held for self-insured liabilities [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Investments held for self-insured liabilities	153.0
Recurring fair value measurement [member] | Interest rate swap [Member]
Disclosure of fair value measurement of assets and liabilities [line items]
Interest rate swap	1.5
Recurring fair value measurement [member] | Significant other observable inputs [member] | Investments held for self-insured liabilities [member]
Disclosure of fair value measurement of assets and liabilities [line items]
Investments held for self-insured liabilities	153.0
Recurring fair value measurement [member] | Significant other observable inputs [member] | Interest rate swap [Member]
Disclosure of fair value measurement of assets and liabilities [line items]
Interest rate swap	$ 1.5

X

- Definition

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

+ References

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- Definition

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

+ References

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- Definition

Disclosure of Fair Value Measurement of Assets and Liabilities [Line item]

+ References

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