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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