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EMPLOYEE BENEFITS OBLIGATIONS - Movement In Defined Benefit Pension Obligation (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset) | $ 157.7 |
Actuarial loss (gain) arising from: |  |
Net defined benefit liability (asset) | 200.6 | $ 157.7
Foreign |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Interest cost/Interest income |  | (1.1)
Funded |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset) | 78.6 |
Current service cost | 23.8 | 23.2
Interest cost/Interest income | (15.2) | (14.7)
Actuarial loss (gain) arising from: |  |
Net defined benefit liability (asset) | 114.8 | 78.6
Funded | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset) | 541.3 | 521.2
Current service cost | 23.8 | 23.2
Interest cost/Interest income | 17.9 | 17.8
Actuarial loss (gain) arising from: |  |
Experience adjustments | 0.5 | 1.7
Economic assumptions | 30.1 | 15.3
Demographic assumptions | 4.8 | (18.6)
Employee contributions | 6.2 | 5.9
Pension benefits paid | (19.0) | (22.6)
Exchange differences | 6.4 | (2.6)
Net defined benefit liability (asset) | 612.0 | 541.3
Funded | Plan assets |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset) | (462.7) | (429.8)
Interest cost/Interest income | (15.2) | (14.7)
Actuarial loss (gain) arising from: |  |
Return on plan assets, excluding amounts included in interest income | 6.7 | 19.4
Employee contributions | 6.2 | 5.9
Employer contributions | 21.2 | 18.9
Pension benefits paid | 19.0 | 22.6
Administrative costs | (1.4) | (1.2)
Exchange differences | 5.6 | (2.2)
Net defined benefit liability (asset) | (497.2) | (462.7)
Funded | Canadian |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 22.3 | 22.0
Interest cost/Interest income | (14.1) | (13.6)
Funded | Canadian | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset) | 487.4 | 468.9
Current service cost | 22.3 | 22.0
Interest cost/Interest income | 16.7 | 16.5
Actuarial loss (gain) arising from: |  |
Experience adjustments | 0.3 | 1.4
Economic assumptions | 27.1 | 13.5
Demographic assumptions | 4.8 | (19.1)
Employee contributions | 6.0 | 5.7
Pension benefits paid | (17.8) | (21.5)
Exchange differences | 0.0 | 0.0
Net defined benefit liability (asset) | 546.8 | 487.4
Funded | Canadian | Plan assets |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset) | (415.9) | (382.9)
Interest cost/Interest income | (14.1) | (13.6)
Actuarial loss (gain) arising from: |  |
Return on plan assets, excluding amounts included in interest income | 3.8 | 19.1
Employee contributions | 6.0 | 5.7
Employer contributions | 20.1 | 17.2
Pension benefits paid | 17.8 | 21.5
Administrative costs | (1.2) | (1.1)
Exchange differences | 0.0 | 0.0
Net defined benefit liability (asset) | (440.9) | (415.9)
Funded | Foreign |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 1.5 | 1.2
Interest cost/Interest income | (1.1) |
Funded | Foreign | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset) | 53.9 | 52.3
Current service cost | 1.5 | 1.2
Interest cost/Interest income | 1.2 | 1.3
Actuarial loss (gain) arising from: |  |
Experience adjustments | 0.2 | 0.3
Economic assumptions | 3.0 | 1.8
Demographic assumptions | 0.0 | 0.5
Employee contributions | 0.2 | 0.2
Pension benefits paid | (1.2) | (1.1)
Exchange differences | 6.4 | (2.6)
Net defined benefit liability (asset) | 65.2 | 53.9
Funded | Foreign | Plan assets |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset) | (46.8) | (46.9)
Interest cost/Interest income | (1.1) | (1.1)
Actuarial loss (gain) arising from: |  |
Return on plan assets, excluding amounts included in interest income | 2.9 | 0.3
Employee contributions | 0.2 | 0.2
Employer contributions | 1.1 | 1.7
Pension benefits paid | 1.2 | 1.1
Administrative costs | (0.2) | (0.1)
Exchange differences | 5.6 | (2.2)
Net defined benefit liability (asset) | (56.3) | (46.8)
Unfunded |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 2.3 | 2.2
Interest cost/Interest income | 2.2 | 2.1
Unfunded | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset) | 79.1 | 76.6
Current service cost | 2.3 | 2.2
Interest cost/Interest income | 2.2 | 2.1
Past service cost, settlements and curtailments | 0.0 | 0.1
Actuarial loss (gain) arising from: |  |
Experience adjustments | (0.4) | (1.1)
Economic assumptions | (3.5) | (1.3)
Demographic assumptions | (0.4) | 0.0
Pension benefits paid | 3.6 | 3.6
Exchange differences | (1.5) | 0.7
Net defined benefit liability (asset) | 85.8 | 79.1
Unfunded | Canadian |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 2.3 | 2.2
Interest cost/Interest income | 2.0 | 1.9
Unfunded | Canadian | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset) | 66.2 | 62.9
Current service cost | 2.3 | 2.2
Interest cost/Interest income | 2.0 | 1.9
Past service cost, settlements and curtailments | 0.0 | 0.0
Actuarial loss (gain) arising from: |  |
Experience adjustments | (0.3) | (1.1)
Economic assumptions | (3.8) | (1.0)
Demographic assumptions | (0.4) | 0.0
Pension benefits paid | 2.8 | 2.9
Exchange differences | 0.0 | 0.0
Net defined benefit liability (asset) | 72.2 | 66.2
Unfunded | Foreign |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 0.0 | 0.0
Interest cost/Interest income | 0.2 | 0.2
Unfunded | Foreign | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Net defined benefit liability (asset) | 12.9 | 13.7
Current service cost | 0.0 | 0.0
Interest cost/Interest income | 0.2 | 0.2
Past service cost, settlements and curtailments | 0.0 | 0.1
Actuarial loss (gain) arising from: |  |
Experience adjustments | (0.1) | 0.0
Economic assumptions | 0.3 | (0.3)
Demographic assumptions | 0.0 | 0.0
Pension benefits paid | 0.8 | 0.7
Exchange differences | (1.5) | 0.7
Net defined benefit liability (asset) | $ 13.6 | $ 12.9

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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in demographic assumptions that result in remeasurements of the net defined benefit liability (asset). Demographic assumptions deal with matters such as: (a) mortality; (b) rates of employee turnover, disability and early retirement; (c) the proportion of plan members with dependants who will be eligible for benefits; (d) the proportion of plan members who will select each form of payment option available under the plan terms; and (e) claim rates under medical plans. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_ii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_iii&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from experience adjustments that result in remeasurements of the net defined benefit liability (asset). Experience adjustments deal with the effects of differences between the previous actuarial assumptions and what has actually occurred. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from contributions to a defined benefit plan by plan participants. [Refer: Net defined benefit liability (asset); Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_f&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 141 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_e&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from the passage of time. [Refer: Interest expense; Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_b&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph g -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_g&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets. The return on plans assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_141_c_i&doctype=Standard -URIDate 2017-03-09 + Details
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