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EMPLOYEE BENEFITS OBLIGATIONS - Net Pension Costs (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Disclosure of net defined benefit liability (asset) [line items] |  |
Net pension costs | $ 40.2 | $ 37.2
Funded plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 32.9 | 31.9
Interest cost and income | (26.4) | (25.4)
Past service cost | 0.0 | 2.9
Settlement gain | (1.4) | (5.4)
Administrative cost | 0.8 | 0.8
Net pension costs | 28.6 | 27.6
Funded plans | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 32.9 | 31.9
Interest cost and income | 22.7 | 22.8
Unfunded plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 4.8 | 5.2
Interest cost and income | 4.4 | 4.4
Past service cost | 2.4 | 0.0
Net pension costs | 11.6 | 9.6
Unfunded plans | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 4.8 | 5.2
Interest cost and income | 4.4 | 4.4
Canadian |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net pension costs | 40.4 | 35.4
Canadian | Funded plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 32.9 | 31.9
Interest cost and income | (26.0) | (25.1)
Past service cost | 0.0 | 2.9
Settlement gain | (1.4) | (5.4)
Administrative cost | 0.8 | 0.8
Net pension costs | 28.7 | 27.6
Canadian | Funded plans | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 32.9 | 31.9
Interest cost and income | 22.4 | 22.5
Canadian | Unfunded plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 4.1 | 3.9
Interest cost and income | 4.0 | 3.9
Past service cost | 3.6 | 0.0
Net pension costs | 11.7 | 7.8
Canadian | Unfunded plans | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 4.1 | 3.9
Interest cost and income | 4.0 | 3.9
Foreign |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net pension costs | (0.2) | 1.8
Foreign | Funded plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 0.0 | 0.0
Interest cost and income | (0.4) | (0.3)
Past service cost | 0.0 | 0.0
Settlement gain | 0.0 | 0.0
Administrative cost | 0.0 | 0.0
Net pension costs | (0.1) | 0.0
Foreign | Funded plans | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 0.0 | 0.0
Interest cost and income | 0.3 | 0.3
Foreign | Unfunded plans |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 0.7 | 1.3
Interest cost and income | 0.4 | 0.5
Past service cost | (1.2) | 0.0
Net pension costs | (0.1) | 1.8
Foreign | Unfunded plans | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 0.7 | 1.3
Interest cost and income | $ 0.4 | $ 0.5

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- Definition Post-employment Benefit Cost, Defined Benefit Plans + References No definition available. + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from employee service in the current period. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 141 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_141_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of income (expense) resulting from settlements. Settlements are transactions that eliminate all further legal or constructive obligations for part or all of the benefits provided under a defined benefit plan, other than a payment of benefits to, or on behalf of, employees that is set out in the terms of the plan and included in the actuarial assumptions. [Refer: Post-employment benefit expense in profit or loss, defined benefit plans; Defined benefit plans [domain]; Actuarial assumptions [domain]] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gains (losses) arising from settlements] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_135_b&doctype=Standard -URIDate 2024-03-27 + Details
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