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EMPLOYEE BENEFITS OBLIGATIONS - Plan Assets (Details) - CAD ($) $ in Millions | Mar. 31, 2019 | Mar. 31, 2018
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Plan assets, at fair value | $ 543.7 | $ 497.2
Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents, amount contributed to fair value of plan assets | 9.7 | 4.4
Other assets, amount contributed to fair value of plan assets | 28.5 | 26.0
Plan assets, at fair value | 485.3 | 440.9
Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Insured Annuities, Amount Contributed To Fair Value Of Plan Assets | 52.2 | 50.1
Equity instruments, amount contributed to fair value of plan assets | 2.5 | 2.6
Other assets, amount contributed to fair value of plan assets | 0.4 | 0.5
Plan assets, at fair value | 58.4 | 56.3
Municipal | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 109.7 | 100.1
Corporate | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 68.8 | 66.4
Corporate | Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 3.3 | 3.1
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
Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Plan assets, at fair value | 5.8 | 5.7
Level 1 | Canada |  |
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 | 2.5 | 2.6
Other assets, amount contributed to fair value of plan assets | 0.0 | 0.0
Plan assets, at fair value | 5.8 | 5.7
Level 1 | Municipal | Canada |  |
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 | Canada |  |
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 | 3.3 | 3.1
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 | 0.0
Level 2 and 3 of fair value hierarchy |  |
Disclosure of fair value of plan assets [line items] |  |
Plan assets, at fair value | 537.9 | 491.5
Level 2 and 3 of fair value hierarchy | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents, amount contributed to fair value of plan assets | 9.7 | 4.4
Other assets, amount contributed to fair value of plan assets | 28.5 | 26.0
Plan assets, at fair value | 485.3 | 440.9
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 | 52.2 | 50.1
Equity instruments, amount contributed to fair value of plan assets | 0.0 | 0.0
Other assets, amount contributed to fair value of plan assets | 0.4 | 0.5
Plan assets, at fair value | 52.6 | 50.6
Level 2 and 3 of fair value hierarchy | Municipal | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 109.7 | 100.1
Level 2 and 3 of fair value hierarchy | Corporate | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 68.8 | 66.4
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
Equity securities - domestic | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments, amount contributed to fair value of plan assets | 58.1 | 52.2
Equity securities - domestic | Level 1 | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments, amount contributed to fair value of plan assets | 0.0 | 0.0
Equity securities - domestic | Level 2 and 3 of fair value hierarchy | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments, amount contributed to fair value of plan assets | 58.1 | 52.2
Equity securities - foreign | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments, amount contributed to fair value of plan assets | 210.5 | 191.8
Equity securities - foreign | Level 1 | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments, amount contributed to fair value of plan assets | 0.0 | 0.0
Equity securities - foreign | Level 2 and 3 of fair value hierarchy | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments, amount contributed to fair value of plan assets | $ 210.5 | $ 191.8

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