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FINANCIAL RISK MANAGEMENT - Narrative (Details)
shares in Millions, $ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2021
CAD ($)
shares
Mar. 31, 2020
CAD ($)
shares
Mar. 31, 2021
USD ($)
May 19, 2020
USD ($)
Mar. 31, 2020
USD ($)
Disclosure of detailed information about financial instruments [line items]          
Accounts receivable, maximum amount available to sell       $ 400.0 $ 300.0
Accounts receivable, amount sold to financial institution $ 298.8 $ 333.1      
Accounts receivable, amount sold to financial institution, fees 26.4 38.8      
Net Income (loss) (47.5) 318.9      
Other comprehensive (loss) income $ (140.1) $ 7.2      
Equity swap agreement, common shares (in shares) | shares 2.5 2.8      
Letters of credit and guarantees, net $ 196.2 $ 189.6      
Bottom of range          
Disclosure of detailed information about financial instruments [line items]          
Terms of Indemnifications 1 year        
Top of range          
Disclosure of detailed information about financial instruments [line items]          
Terms of Indemnifications 2 years        
Revolving Unsecured Term Credit Facility, September 2022          
Disclosure of detailed information about financial instruments [line items]          
Line of credit facility, maximum borrowing capacity $ 500.0   $ 850.0   $ 850.0
Foreign currency and interest rate swap agreements          
Disclosure of detailed information about financial instruments [line items]          
Debt, fixed interest rate 94.00% 74.00% 94.00%   74.00%
Currency risk          
Disclosure of detailed information about financial instruments [line items]          
Foreign currency strengthening change 5.00%   5.00%    
Foreign currency rate change, based on weakening of foreign currency 5.00%   5.00%    
Interest rate risk          
Disclosure of detailed information about financial instruments [line items]          
Sensitivity analysis to interest rate change 1.00%        
Net Income (loss) $ (1.7) $ (5.7)      
Other comprehensive (loss) income $ 0.0 $ 0.0      
Sensitivity analysis to interest rate change, decrease 1.00%        
Hedges Of Net Investment In US Entities          
Disclosure of detailed information about financial instruments [line items]          
Debt     $ 862.8   $ 862.8
Gross finance lease obligations     $ 23.9   $ 48.1