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FINANCIAL RISK MANAGEMENT - Narrative (Details)
$ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2023
CAD ($)
shares
Mar. 31, 2022
CAD ($)
shares
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Disclosure of detailed information about financial instruments [line items]        
Line of credit facility, maximum borrowing capacity   $ 300.0 $ 1,000.0 $ 850.0
Accounts receivable, maximum amount available to sell     $ 400.0 400.0
Accounts receivable, amount sold to financial institution $ 266.7 213.9    
Accounts receivable, amount sold to financial institution, fees $ 42.4 21.0    
Strengthening in the relevant foreign currency against the Canadian dollar (in percent) 5.00%   5.00%  
Net income $ 231.9 150.0    
Other comprehensive income (loss) $ 257.0 $ (13.2)    
Equity swap agreement, common shares (in shares) | shares 2,700,000 2,700,000    
Letters of credit and guarantees, net $ 242.5 $ 216.1    
U.S. Federal Government        
Disclosure of detailed information about financial instruments [line items]        
Percentage of entity's revenue 22.00% 23.00%    
Interest rate risk        
Disclosure of detailed information about financial instruments [line items]        
Sensitivity analysis to interest rate change (in percent) 1.00%      
Net income $ (8.8) $ (5.0)    
Other comprehensive income (loss) $ 0.0 $ 0.0    
Bottom of range        
Disclosure of detailed information about financial instruments [line items]        
Terms of Indemnifications (in years) 1 year      
Top of range        
Disclosure of detailed information about financial instruments [line items]        
Terms of Indemnifications (in years) 2 years      
Unsecured senior notes, term loans and revolving credit facility | Hedges of net investment in foreign operations [member]        
Disclosure of detailed information about financial instruments [line items]        
Debt     $ 1,054.8 $ 1,068.8
Foreign currency and interest rate swap agreements        
Disclosure of detailed information about financial instruments [line items]        
Fixed interest rate (in percent) 73.00% 75.00% 73.00% 75.00%