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EMPLOYEE BENEFITS OBLIGATIONS - Plan Assets (Details) - CAD ($)
$ in Millions
Mar. 31, 2018
Mar. 31, 2017
Disclosure of fair value of plan assets [line items]    
Plan assets, at fair value $ 497.2 $ 462.7
Canadian    
Disclosure of fair value of plan assets [line items]    
Cash and cash equivalents, amount contributed to fair value of plan assets 4.4 0.0
Other assets, amount contributed to fair value of plan assets 26.0 32.6
Plan assets, at fair value 440.9 415.9
Foreign    
Disclosure of fair value of plan assets [line items]    
Insured Annuities, Amount Contributed To Fair Value Of Plan Assets 50.1 41.3
Equity instruments, amount contributed to fair value of plan assets 2.6 2.4
Other assets, amount contributed to fair value of plan assets 0.5 0.4
Plan assets, at fair value 56.3 46.8
CANADA | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity instruments, amount contributed to fair value of plan assets 52.2 110.0
Foreign countries | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity instruments, amount contributed to fair value of plan assets 191.8 122.3
Municipal | Canadian    
Disclosure of fair value of plan assets [line items]    
Debt instruments, amount contributed to fair value of plan assets 100.1 116.4
Corporate | Canadian    
Disclosure of fair value of plan assets [line items]    
Debt instruments, amount contributed to fair value of plan assets 66.4 34.6
Corporate | Foreign    
Disclosure of fair value of plan assets [line items]    
Debt instruments, amount contributed to fair value of plan assets 3.1 1.5
Other | Foreign    
Disclosure of fair value of plan assets [line items]    
Debt instruments, amount contributed to fair value of plan assets 0.0 1.2
Level 1    
Disclosure of fair value of plan assets [line items]    
Plan assets, at fair value 5.7 5.1
Level 1 | Canadian    
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 5.7 5.1
Level 1 | CANADA | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity instruments, amount contributed to fair value of plan assets 0.0 0.0
Level 1 | Foreign countries | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity instruments, amount contributed to fair value of plan assets 0.0 0.0
Level 1 | Municipal | Canadian    
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 | Canadian    
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 3.1 1.5
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 1.2
Level 2 and 3 of fair value hierarchy    
Disclosure of fair value of plan assets [line items]    
Plan assets, at fair value 491.5 457.6
Level 2 and 3 of fair value hierarchy | Canadian    
Disclosure of fair value of plan assets [line items]    
Cash and cash equivalents, amount contributed to fair value of plan assets 4.4 0.0
Other assets, amount contributed to fair value of plan assets 26.0 32.6
Plan assets, at fair value 440.9 415.9
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 50.1 41.3
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 50.6 41.7
Level 2 and 3 of fair value hierarchy | CANADA | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity instruments, amount contributed to fair value of plan assets 52.2 110.0
Level 2 and 3 of fair value hierarchy | Foreign countries | Canadian    
Disclosure of fair value of plan assets [line items]    
Equity instruments, amount contributed to fair value of plan assets 191.8 122.3
Level 2 and 3 of fair value hierarchy | Municipal | Canadian    
Disclosure of fair value of plan assets [line items]    
Debt instruments, amount contributed to fair value of plan assets 100.1 116.4
Level 2 and 3 of fair value hierarchy | Corporate | Canadian    
Disclosure of fair value of plan assets [line items]    
Debt instruments, amount contributed to fair value of plan assets 66.4 34.6
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