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DEBT FACILITIES - Future Minimum Lease Payments (Details)
$ in Millions, $ in Millions
Mar. 31, 2018
USD ($)
Mar. 31, 2018
CAD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2017
CAD ($)
Disclosure of finance lease and operating lease by lessee [line items]        
Minimum finance lease payments payable $ 119.4 $ 201.8 $ 192.3 $ 240.4
Future finance charge on finance lease   47.2   58.3
Discounted guaranteed residual value of assets subject to finance lease   9.2   8.8
Minimum finance lease payments payable, at present value   145.4   173.3
No later than 1 year        
Disclosure of finance lease and operating lease by lessee [line items]        
Minimum finance lease payments payable   25.8   30.1
Minimum finance lease payments payable, at present value   17.0   20.7
Later than 1 year and no later than 5 years        
Disclosure of finance lease and operating lease by lessee [line items]        
Minimum finance lease payments payable   105.8   123.3
Minimum finance lease payments payable, at present value   81.0   92.0
Later than 5 years        
Disclosure of finance lease and operating lease by lessee [line items]        
Minimum finance lease payments payable   70.2   87.0
Minimum finance lease payments payable, at present value   $ 47.4   $ 60.6