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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