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Employee Defined Benefit Obligations - Summary of Quantitative Sensitivity Analyses Impact on Defined Benefit Obligation for Significant Assumptions (Details) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Change in discount rate by 0.25% |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Increase | $ (11.4) | $ (22.3)
Decrease | $ 11.6 | 23.8
Percentage of increase | 0.25% |
Percentage of decrease | 0.25% |
Change in pre-retirement inflation rate by 0.25% |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Increase | $ 2.7 | 5.1
Decrease | $ (2.7) | (5.1)
Percentage of increase | 0.25% |
Percentage of decrease | 0.25% |
Change in salary growth by 0.25% |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Increase | $ 0.3 | 1.1
Decrease | $ (0.3) | (1.1)
Percentage of increase | 0.25% |
Percentage of decrease | 0.25% |
Change in pension increase assumption by 0.25% |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Increase | $ 7.1 | 12.3
Decrease | $ (7.1) | (11.6)
Percentage of increase | 0.25% |
Percentage of decrease | 0.25% |
Change in one year in the life expectancy |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Increase | $ 10.3 | 12.0
Decrease | $ (10.3) | $ (12.0)

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2022-03-24 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2022-en-r&anchor=para_145_a&doctype=Standard -URIDate 2022-03-24 + Details
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