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SHARE-BASED PAYMENTS - Share-based Compensation Cost (Details) - CAD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Recognized in the consolidated statement of financial position $ (0.1) $ 60.7
Share-based compensation obligations (49.3) (105.7)
Employee Stock Option Plan    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from equity-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets 5.8 6.4
Employee Stock Purchase Plan (ESPP)    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from cash-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets 10.3 8.5
Share-based compensation obligations 0.0 0.0
Deferred Share Unit (DSU)    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from cash-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets (2.4) 6.3
Share-based compensation obligations (8.4) (15.5)
Restricted Share Unit Plan (RSU)    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from cash-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets (10.9) 13.0
Share-based compensation obligations (24.7) (43.2)
Performance Share Unit Plan (PSU)    
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Expense from cash-settled share-based payment transactions in which goods or services received did not qualify for recognition as assets (2.9) 26.5
Share-based compensation obligations $ (16.2) $ (47.0)