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FINANCIAL RISK MANAGEMENT - Narrative (Details)
$ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2019
CAD ($)
Debt_tranche
shares
Mar. 31, 2018
CAD ($)
shares
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2013
Foreign_currency_swap_agreement
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]          
Accounts receivable, maximum amount available to sell     $ 300.0    
Accounts receivable, amount sold to financial institution $ 266.2 $ 168.3      
Accounts receivable, amount sold to financial institution, fees 4.4 2.4      
Net income 340.1 354.7      
Other comprehensive (loss) income $ (55.3) $ 43.9      
Equity swap agreement, common shares (in shares) | shares 2,250,000 2,150,000      
Borrowings $ 2,328.3 $ 1,260.9      
Letters of credit and guarantees, net $ 205.0 $ 223.4      
Revolving Unsecured Term Credit Facility, September 2022          
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]          
Line of credit facility, maximum borrowing capacity     550.0 $ 550.0  
Line of credit facility, maximum borrowing capacity option     $ 850.0    
Foreign currency swap agreements          
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]          
Debt, fixed interest rate 83.00% 88.00% 83.00% 88.00%  
Currency risk          
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]          
Foreign currency strengthening change 5.00%   5.00%    
Interest rate risk          
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]          
Sensitivity analysis to interest rate change 1.00%        
Net income $ 4.1 $ 1.2      
Other comprehensive (loss) income $ 0.0 0.3      
USD/CDN | Foreign currency swap agreements          
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]          
Number of derivative agreements entered into | Foreign_currency_swap_agreement         2
Number of tranches relating to the multi-tranche private placement debt offering | Debt_tranche 2        
USD/CDN | Currency risk          
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]          
Net income $ 3.0 4.6      
Other comprehensive (loss) income (17.2) (17.3)      
Multi-Tranche Private Placement Debt, Tranche One, December 2024 | USD/CDN | Foreign currency swap agreements          
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]          
Derivative, notional amount 130.5 130.5 $ 127.0 $ 127.0  
Multi-Tranche Private Placement Debt, Tranche Two, December 2027 | USD/CDN | Foreign currency swap agreements          
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]          
Derivative, notional amount $ 100.7 $ 100.7 98.0 98.0  
Hedges Of Net Investment In US Entities          
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]          
Gross finance lease obligations     64.0 8.6  
Hedges Of Net Investment In US Entities | Senior Notes          
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items]          
Borrowings     $ 822.8 $ 372.8