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EMPLOYEE BENEFITS OBLIGATIONS - Plan Assets (Details) - CAD ($)
$ in Millions
Mar. 31, 2020
Mar. 31, 2019
Disclosure of fair value of plan assets [line items]    
Plan assets, at fair value $ 530.1 $ 543.7
Canada    
Disclosure of fair value of plan assets [line items]    
Cash and cash equivalents, amount contributed to fair value of plan assets 4.3 9.7
Other assets, amount contributed to fair value of plan assets 65.2 28.5
Plan assets, at fair value 467.8 485.3
Foreign    
Disclosure of fair value of plan assets [line items]    
Insured Annuities, Amount Contributed To Fair Value Of Plan Assets 55.9 52.2
Equity instruments, amount contributed to fair value of plan assets 2.4 2.5
Other assets, amount contributed to fair value of plan assets 0.5 0.4
Plan assets, at fair value 62.3 58.4
Municipal | Canada    
Disclosure of fair value of plan assets [line items]    
Debt instruments, amount contributed to fair value of plan assets 92.2 109.7
Corporate | Canada    
Disclosure of fair value of plan assets [line items]    
Debt instruments, amount contributed to fair value of plan assets 85.2 68.8
Corporate | Foreign    
Disclosure of fair value of plan assets [line items]    
Debt instruments, amount contributed to fair value of plan assets 3.5 3.3
Level 1    
Disclosure of fair value of plan assets [line items]    
Plan assets, at fair value 5.9 5.8
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 2.4 2.5
Other assets, amount contributed to fair value of plan assets 0.0 0.0
Plan assets, at fair value 5.9 5.8
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 3.5 3.3
Level 2 and 3 of fair value hierarchy    
Disclosure of fair value of plan assets [line items]    
Plan assets, at fair value 524.2 537.9
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 4.3 9.7
Other assets, amount contributed to fair value of plan assets 65.2 28.5
Plan assets, at fair value 467.8 485.3
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 55.9 52.2
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 56.4 52.6
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 92.2 109.7
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 85.2 68.8
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 55.2 58.1
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 55.2 58.1
Equity securities - foreign | Canada    
Disclosure of fair value of plan assets [line items]    
Equity instruments, amount contributed to fair value of plan assets 165.7 210.5
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 $ 165.7 $ 210.5