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EMPLOYEE BENEFITS OBLIGATIONS - Plan Assets (Details) - CAD ($) $ in Millions | Mar. 31, 2018 | Mar. 31, 2017
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Plan assets, at fair value | $ 497.2 | $ 462.7
Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents, amount contributed to fair value of plan assets | 4.4 | 0.0
Other assets, amount contributed to fair value of plan assets | 26.0 | 32.6
Plan assets, at fair value | 440.9 | 415.9
Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Insured Annuities, Amount Contributed To Fair Value Of Plan Assets | 50.1 | 41.3
Equity instruments, amount contributed to fair value of plan assets | 2.6 | 2.4
Other assets, amount contributed to fair value of plan assets | 0.5 | 0.4
Plan assets, at fair value | 56.3 | 46.8
CANADA | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments, amount contributed to fair value of plan assets | 52.2 | 110.0
Foreign countries | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments, amount contributed to fair value of plan assets | 191.8 | 122.3
Municipal | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 100.1 | 116.4
Corporate | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 66.4 | 34.6
Corporate | Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 3.1 | 1.5
Other | Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 0.0 | 1.2
Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Plan assets, at fair value | 5.7 | 5.1
Level 1 | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents, amount contributed to fair value of plan assets | 0.0 | 0.0
Other assets, amount contributed to fair value of plan assets | 0.0 | 0.0
Plan assets, at fair value | 0.0 | 0.0
Level 1 | Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Insured Annuities, Amount Contributed To Fair Value Of Plan Assets | 0.0 | 0.0
Equity instruments, amount contributed to fair value of plan assets | 2.6 | 2.4
Other assets, amount contributed to fair value of plan assets | 0.0 | 0.0
Plan assets, at fair value | 5.7 | 5.1
Level 1 | CANADA | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments, amount contributed to fair value of plan assets | 0.0 | 0.0
Level 1 | Foreign countries | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments, amount contributed to fair value of plan assets | 0.0 | 0.0
Level 1 | Municipal | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 0.0 | 0.0
Level 1 | Corporate | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 0.0 | 0.0
Level 1 | Corporate | Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 3.1 | 1.5
Level 1 | Other | Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 0.0 | 1.2
Level 2 and 3 of fair value hierarchy |  |
Disclosure of fair value of plan assets [line items] |  |
Plan assets, at fair value | 491.5 | 457.6
Level 2 and 3 of fair value hierarchy | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents, amount contributed to fair value of plan assets | 4.4 | 0.0
Other assets, amount contributed to fair value of plan assets | 26.0 | 32.6
Plan assets, at fair value | 440.9 | 415.9
Level 2 and 3 of fair value hierarchy | Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Insured Annuities, Amount Contributed To Fair Value Of Plan Assets | 50.1 | 41.3
Equity instruments, amount contributed to fair value of plan assets | 0.0 | 0.0
Other assets, amount contributed to fair value of plan assets | 0.5 | 0.4
Plan assets, at fair value | 50.6 | 41.7
Level 2 and 3 of fair value hierarchy | CANADA | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments, amount contributed to fair value of plan assets | 52.2 | 110.0
Level 2 and 3 of fair value hierarchy | Foreign countries | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments, amount contributed to fair value of plan assets | 191.8 | 122.3
Level 2 and 3 of fair value hierarchy | Municipal | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 100.1 | 116.4
Level 2 and 3 of fair value hierarchy | Corporate | Canadian |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 66.4 | 34.6
Level 2 and 3 of fair value hierarchy | Corporate | Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 0.0 | 0.0
Level 2 and 3 of fair value hierarchy | Other | Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | $ 0.0 | $ 0.0

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