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EMPLOYEE BENEFITS OBLIGATIONS - Plan Assets (Details) - CAD ($) $ in Millions | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Plan assets, at fair value | $ 641.9 | $ 530.1
Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents, amount contributed to fair value of plan assets | 11.2 | 4.3
Other assets, amount contributed to fair value of plan assets | 80.7 | 65.2
Plan assets, at fair value | 574.7 | 467.8
Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Insured annuities, amount contributed to fair value of plan assets | 60.3 | 55.9
Equity instruments, amount contributed to fair value of plan assets | 2.6 | 2.4
Other assets, amount contributed to fair value of plan assets | 0.6 | 0.5
Plan assets, at fair value | 67.2 | 62.3
Municipal | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 113.0 | 92.2
Corporate | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 104.3 | 85.2
Corporate | Foreign |  |
Disclosure of fair value of plan assets [line items] |  |
Debt instruments, amount contributed to fair value of plan assets | 3.7 | 3.5
Level 1 |  |
Disclosure of fair value of plan assets [line items] |  |
Plan assets, at fair value | 6.3 | 5.9
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 | 2.6 | 2.4
Other assets, amount contributed to fair value of plan assets | 0.0 | 0.0
Plan assets, at fair value | 6.3 | 5.9
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 | 3.7 | 3.5
Level 2 and 3 of fair value hierarchy |  |
Disclosure of fair value of plan assets [line items] |  |
Plan assets, at fair value | 635.6 | 524.2
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 | 11.2 | 4.3
Other assets, amount contributed to fair value of plan assets | 80.7 | 65.2
Plan assets, at fair value | 574.7 | 467.8
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 | 60.3 | 55.9
Equity instruments, amount contributed to fair value of plan assets | 0.0 | 0.0
Other assets, amount contributed to fair value of plan assets | 0.6 | 0.5
Plan assets, at fair value | 60.9 | 56.4
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 | 113.0 | 92.2
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 | 104.3 | 85.2
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
Equity securities - domestic | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments, amount contributed to fair value of plan assets | 78.2 | 55.2
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 | 78.2 | 55.2
Equity securities - foreign | Canada |  |
Disclosure of fair value of plan assets [line items] |  |
Equity instruments, amount contributed to fair value of plan assets | 187.3 | 165.7
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 | $ 187.3 | $ 165.7

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