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EMPLOYEE BENEFITS OBLIGATIONS - Net Periodic Costs (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefits – defined benefit plans | $ 40.9 | $ 32.4
Funded |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 29.0 | 23.8
Interest expense (income), net defined benefit liability (asset) | (15.3) | (15.2)
Past service cost, net defined benefit liability (asset) | 1.7 | 0.0
Administrative costs, net defined benefit liability (asset) | 1.0 | 1.4
Post-employment benefits – defined benefit plans | 35.0 | 27.9
Funded | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 29.0 | 23.8
Interest expense (income), net defined benefit liability (asset) | 18.6 | 17.9
Unfunded |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 3.5 | 2.3
Interest expense (income), net defined benefit liability (asset) | 2.4 | 2.2
Past service cost, net defined benefit liability (asset) | 0.0 | 0.0
Post-employment benefits – defined benefit plans | 5.9 | 4.5
Unfunded | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 3.5 | 2.3
Interest expense (income), net defined benefit liability (asset) | 2.4 | 2.2
Foreign |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Interest expense (income), net defined benefit liability (asset) |  | (1.1)
Post-employment benefits – defined benefit plans | 4.1 | 2.0
Foreign | Funded |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 1.8 | 1.5
Interest expense (income), net defined benefit liability (asset) | (1.0) |
Past service cost, net defined benefit liability (asset) | 0.0 | 0.0
Administrative costs, net defined benefit liability (asset) | 0.1 | 0.2
Post-employment benefits – defined benefit plans | 2.1 | 1.8
Foreign | Funded | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 1.8 | 1.5
Interest expense (income), net defined benefit liability (asset) | 1.2 | 1.2
Foreign | Unfunded |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 0.1 | 0.0
Interest expense (income), net defined benefit liability (asset) | 0.2 | 0.2
Past service cost, net defined benefit liability (asset) | 1.7 | 0.0
Post-employment benefits – defined benefit plans | 2.0 | 0.2
Foreign | Unfunded | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 0.1 | 0.0
Interest expense (income), net defined benefit liability (asset) | 0.2 | 0.2
Canada |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Post-employment benefits – defined benefit plans | 36.8 | 30.4
Canada | Funded |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 27.2 | 22.3
Interest expense (income), net defined benefit liability (asset) | (14.3) | (14.1)
Past service cost, net defined benefit liability (asset) | 1.7 | 0.0
Administrative costs, net defined benefit liability (asset) | 0.9 | 1.2
Post-employment benefits – defined benefit plans | 32.9 | 26.1
Canada | Funded | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 27.2 | 22.3
Interest expense (income), net defined benefit liability (asset) | 17.4 | 16.7
Canada | Unfunded |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 3.4 | 2.3
Interest expense (income), net defined benefit liability (asset) | 2.2 | 2.0
Past service cost, net defined benefit liability (asset) | (1.7) | 0.0
Post-employment benefits – defined benefit plans | 3.9 | 4.3
Canada | Unfunded | Present value of defined benefit obligation |  |
Disclosure of net defined benefit liability (asset) [line items] |  |
Current service cost | 3.4 | 2.3
Interest expense (income), net defined benefit liability (asset) | $ 2.2 | $ 2.0

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