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Employee Defined Benefit Plans - Schedule of Quantitative Sensitivity Analyses Impact on Defined Benefit Obligation for Significant Assumptions (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Change in discount rate by 0.25% |  |
Disclosure of sensitivity analysis for actuarial assumptions [Line Items] |  |
Increase | $ (13.8) | $ (11.4)
Decrease | $ 14.3 | 11.6
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 | $ 2.4 | 2.7
Decrease | $ (2.4) | (2.7)
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 | 0.3
Decrease | $ (0.3) | (0.3)
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 | $ 7.5 | 7.1
Decrease | $ (7.4) | (7.1)
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 | $ 13.5 | 10.3
Decrease | $ (13.5) | $ (10.3)

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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 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + 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 2023-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_145_a&doctype=Standard -URIDate 2023-03-23 + Details
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