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EMPLOYEE BENEFITS OBLIGATIONS - Employee Benefit Obligation (Details) - CAD ($) $ in Millions | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | --- | ---
Disclosure of defined benefit plans [line items] |  |  |
Net defined benefit liability (asset) | $ 212.6 | $ 200.6 |
Funded |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Net defined benefit liability (asset) | 120.7 | 114.8 |
Present value of defined benefit obligation | Funded |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Net defined benefit liability (asset) | 664.4 | 612.0 | $ 541.3
Present value of defined benefit obligation | Unfunded |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Net defined benefit liability (asset) | 91.9 | 85.8 | 79.1
Plan assets | Funded |  |  |
Disclosure of defined benefit plans [line items] |  |  |
Net defined benefit liability (asset) | $ (543.7) | $ (497.2) | $ (462.7)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_140_a&doctype=Standard -URIDate 2018-03-16 + Details
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