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FINANCE EXPENSE - NET (Details) - CAD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Finance expense:    
Long-term debt (other than finance leases) $ 53.5 $ 53.7
Finance leases 9.0 10.5
Royalty obligations 11.9 10.6
Employee benefits obligations 4.9 5.2
Financing cost amortization 1.4 1.5
Other 12.9 5.7
Borrowing costs capitalized (3.7) (3.2)
Finance expense 89.9 84.0
Finance income:    
Loans and finance lease contracts (9.9) (8.2)
Other (3.8) (3.4)
Finance income (13.7) (11.6)
Finance expense – net $ 76.2 $ 72.4
Capitalisation rate of borrowing costs eligible for capitalisation 4.33% 4.37%