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EMPLOYEE BENEFITS OBLIGATIONS - Significant Assumptions (Details) $ in Millions	Mar. 31, 2019 CAD ($)
Actuarial assumption of discount rates
Disclosure of defined benefit plans [line items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	$ (33.7)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	36.5
Actuarial assumption of expected rates of salary increases
Disclosure of defined benefit plans [line items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	9.0
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	(8.6)
Canada | Actuarial assumption of discount rates | Funded
Disclosure of defined benefit plans [line items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	(27.4)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	29.5
Canada | Actuarial assumption of discount rates | Unfunded
Disclosure of defined benefit plans [line items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	(2.4)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	2.8
Canada | Actuarial assumption of expected rates of salary increases | Funded
Disclosure of defined benefit plans [line items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	8.3
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	(7.9)
Canada | Actuarial assumption of expected rates of salary increases | Unfunded
Disclosure of defined benefit plans [line items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	0.5
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	(0.5)
Foreign | Actuarial assumption of discount rates | Funded
Disclosure of defined benefit plans [line items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	(3.4)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	3.7
Foreign | Actuarial assumption of discount rates | Unfunded
Disclosure of defined benefit plans [line items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	(0.5)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	0.5
Foreign | Actuarial assumption of expected rates of salary increases | Funded
Disclosure of defined benefit plans [line items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	0.2
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	(0.2)
Foreign | Actuarial assumption of expected rates of salary increases | Unfunded
Disclosure of defined benefit plans [line items]
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption	0.0
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption	$ 0.0

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- Definition

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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 [member]]

+ References

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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

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