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EMPLOYEE BENEFITS OBLIGATIONS - Significant Assumptions (Details) $ in Millions	Mar. 31, 2025 CAD ($)
Disclosure of defined benefit plans [line items]
Change in significant assumptions (in percent)	0.25%
Discount rate:
Disclosure of defined benefit plans [line items]
Increase (decrease) in discount rate	$ (30.8)
Increase (decrease) in compensation rate	33.4
Compensation rate:
Disclosure of defined benefit plans [line items]
Increase (decrease) in discount rate	11.6
Increase (decrease) in compensation rate	(11.1)
Canadian | Discount rate: | Funded plans
Disclosure of defined benefit plans [line items]
Increase (decrease) in discount rate	(27.9)
Increase (decrease) in compensation rate	30.2
Canadian | Discount rate: | Unfunded plans
Disclosure of defined benefit plans [line items]
Increase (decrease) in discount rate	(2.5)
Increase (decrease) in compensation rate	2.7
Canadian | Compensation rate: | Funded plans
Disclosure of defined benefit plans [line items]
Increase (decrease) in discount rate	11.1
Increase (decrease) in compensation rate	(10.6)
Canadian | Compensation rate: | Unfunded plans
Disclosure of defined benefit plans [line items]
Increase (decrease) in discount rate	0.5
Increase (decrease) in compensation rate	(0.5)
Foreign | Discount rate: | Funded plans
Disclosure of defined benefit plans [line items]
Increase (decrease) in discount rate	(0.1)
Increase (decrease) in compensation rate	0.1
Foreign | Discount rate: | Unfunded plans
Disclosure of defined benefit plans [line items]
Increase (decrease) in discount rate	(0.3)
Increase (decrease) in compensation rate	0.4
Foreign | Compensation rate: | Funded plans
Disclosure of defined benefit plans [line items]
Increase (decrease) in discount rate	0.0
Increase (decrease) in compensation rate	0.0
Foreign | Compensation rate: | Unfunded plans
Disclosure of defined benefit plans [line items]
Increase (decrease) in discount rate	0.0
Increase (decrease) in compensation rate	$ 0.0

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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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 [domain]]

+ References

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-IssueDate 2024-01-01
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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 [domain]]

+ References

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

The reasonably possible percentage of the increase in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [domain]]

+ References

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