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Fair Value Measurements - Summary of Fair Value Hierarchy for Assets (Details) - CAD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Disclosure of fair value measurement of assets and liabilities [line items]
Assets	$ 198.3	$ 174.9
Recurring fair value measurement | Interest rate swap
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities	2.3
Recurring fair value measurement | Investments held for self-insured liabilities
Disclosure of fair value measurement of assets and liabilities [line items]
Assets	198.3
Recurring fair value measurement | Total return swap on share-based compensation units
Disclosure of fair value measurement of assets and liabilities [line items]
Assets	0.3
Recurring fair value measurement | Foreign currency forward contracts
Disclosure of fair value measurement of assets and liabilities [line items]
Assets	0.3
Recurring fair value measurement | Level 1 | Interest rate swap
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities	0.0
Recurring fair value measurement | Level 1 | Investments held for self-insured liabilities
Disclosure of fair value measurement of assets and liabilities [line items]
Assets	0.0
Recurring fair value measurement | Level 1 | Total return swap on share-based compensation units
Disclosure of fair value measurement of assets and liabilities [line items]
Assets	0.0
Recurring fair value measurement | Level 1 | Foreign currency forward contracts
Disclosure of fair value measurement of assets and liabilities [line items]
Assets	0.0
Recurring fair value measurement | Level 2 | Interest rate swap
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities	2.3
Recurring fair value measurement | Level 2 | Investments held for self-insured liabilities
Disclosure of fair value measurement of assets and liabilities [line items]
Assets	198.3
Recurring fair value measurement | Level 2 | Total return swap on share-based compensation units
Disclosure of fair value measurement of assets and liabilities [line items]
Assets	0.3
Recurring fair value measurement | Level 2 | Foreign currency forward contracts
Disclosure of fair value measurement of assets and liabilities [line items]
Assets	0.3
Recurring fair value measurement | Level 3 | Interest rate swap
Disclosure of fair value measurement of assets and liabilities [line items]
Liabilities	0.0
Recurring fair value measurement | Level 3 | Investments held for self-insured liabilities
Disclosure of fair value measurement of assets and liabilities [line items]
Assets	0.0
Recurring fair value measurement | Level 3 | Total return swap on share-based compensation units
Disclosure of fair value measurement of assets and liabilities [line items]
Assets	0.0
Recurring fair value measurement | Level 3 | Foreign currency forward contracts
Disclosure of fair value measurement of assets and liabilities [line items]
Assets	$ 0.0

X

- 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
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

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+ References

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