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EMPLOYEE BENEFITS OBLIGATIONS - Significant Assumptions (Details) $ in Millions | Mar. 31, 2018 CAD ($)
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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 | $ (30.9)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 33.2
Actuarial assumption of discount rates | Funded | Canadian |
Disclosure of defined benefit plans [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (24.9)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 26.7
Actuarial assumption of discount rates | Funded | Foreign |
Disclosure of defined benefit plans [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (3.2)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 3.5
Actuarial assumption of discount rates | Unfunded | Canadian |
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 | 2.6
Actuarial assumption of discount rates | Unfunded | Foreign |
Disclosure of defined benefit plans [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (0.4)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 0.4
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 | 7.8
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | (7.4)
Actuarial assumption of expected rates of salary increases | Funded | Canadian |
Disclosure of defined benefit plans [line items] |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | 7.1
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | (6.7)
Actuarial assumption of expected rates of salary increases | Funded | Foreign |
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)
Actuarial assumption of expected rates of salary increases | Unfunded | Canadian |
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)
Actuarial assumption of expected rates of salary increases | Unfunded | Foreign |
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 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 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_145_a&doctype=Standard -URIDate 2017-03-09 + Details
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