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FINANCIAL RISK MANAGEMENT - Maturity Analysis (Details) - CAD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, carrying amount $ 3,282.1 $ 2,018.6
Non-derivative financial liabilities, undiscounted cash flows 4,576.8 2,654.4
Derivative financial instruments, carrying amount (12.6) (2.2)
Derivative financial instruments, undiscounted cash flows (14.2) (2.7)
Non-derivative financial liabilities and derivative financial instruments, carrying amount 3,269.5 2,016.4
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 4,562.6 2,651.7
0-12 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 1,130.9 676.5
Derivative financial instruments, undiscounted cash flows (1.7) 5.2
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 1,129.2 681.7
13-24 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 271.0 280.9
Derivative financial instruments, undiscounted cash flows (5.0) 0.0
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 266.0 280.9
25-36 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 244.5 110.2
Derivative financial instruments, undiscounted cash flows (1.7) (1.5)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 242.8 108.7
37-48 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 271.0 255.2
Derivative financial instruments, undiscounted cash flows (1.2) (1.5)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 269.8 253.7
49-60 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 261.2 106.7
Derivative financial instruments, undiscounted cash flows (1.9) (1.4)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 259.3 105.3
Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 2,398.2 1,224.9
Derivative financial instruments, undiscounted cash flows (2.7) (3.5)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 2,395.5 1,221.4
Accounts payable and accrued liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, carrying amount 770.8 588.2
Non-derivative financial liabilities, undiscounted cash flows 770.8 588.2
Accounts payable and accrued liabilities | 0-12 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 770.8 588.2
Accounts payable and accrued liabilities | 13-24 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 0.0 0.0
Accounts payable and accrued liabilities | 25-36 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 0.0 0.0
Accounts payable and accrued liabilities | 37-48 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 0.0 0.0
Accounts payable and accrued liabilities | 49-60 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 0.0 0.0
Accounts payable and accrued liabilities | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 0.0 0.0
Long-term debt    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, carrying amount 2,335.4 1,262.9
Non-derivative financial liabilities, undiscounted cash flows 3,393.0 1,643.5
Long-term debt | 0-12 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 359.8 88.3
Long-term debt | 13-24 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 251.7 262.1
Long-term debt | 25-36 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 200.3 91.6
Long-term debt | 37-48 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 239.4 212.2
Long-term debt | 49-60 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 228.6 75.8
Long-term debt | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 2,113.2 913.5
Other non-current liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, carrying amount 175.9 167.5
Non-derivative financial liabilities, undiscounted cash flows 413.0 422.7
Other non-current liabilities | 0-12 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 0.3 0.0
Other non-current liabilities | 13-24 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 19.3 18.8
Other non-current liabilities | 25-36 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 44.2 18.6
Other non-current liabilities | 37-48 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 31.6 43.0
Other non-current liabilities | 49-60 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 32.6 30.9
Other non-current liabilities | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 285.0 311.4
Forward foreign currency contracts    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount 9.0 10.8
Forward foreign currency contracts, outflow    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 1,708.0 1,351.4
Forward foreign currency contracts, outflow | 0-12 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 1,448.0 1,146.5
Forward foreign currency contracts, outflow | 13-24 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 186.4 162.0
Forward foreign currency contracts, outflow | 25-36 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 55.0 22.4
Forward foreign currency contracts, outflow | 37-48 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 16.3 12.8
Forward foreign currency contracts, outflow | 49-60 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 1.0 6.7
Forward foreign currency contracts, outflow | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 1.3 1.0
Forward foreign currency contracts, inflow    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1,699.0) (1,339.0)
Forward foreign currency contracts, inflow | 0-12 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1,437.1) (1,136.7)
Forward foreign currency contracts, inflow | 13-24 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (189.4) (160.2)
Forward foreign currency contracts, inflow | 25-36 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (54.7) (22.1)
Forward foreign currency contracts, inflow | 37-48 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (15.5) (12.5)
Forward foreign currency contracts, inflow | 49-60 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1.0) (6.4)
Forward foreign currency contracts, inflow | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1.3) (1.1)
Swap derivatives    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount (11.1) (10.6)
Derivative financial instruments, undiscounted cash flows (12.7) (12.7)
Swap derivatives | 0-12 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (2.1) (2.2)
Swap derivatives | 13-24 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (2.0) (1.8)
Swap derivatives | 25-36 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (2.0) (1.8)
Swap derivatives | 37-48 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (2.0) (1.8)
Swap derivatives | 49-60 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1.9) (1.7)
Swap derivatives | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (2.7) (3.4)
Embedded foreign currency derivatives    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount (0.1) (0.9)
Derivative financial instruments, undiscounted cash flows (0.1) (0.9)
Embedded foreign currency derivatives | 0-12 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (0.1) (0.9)
Embedded foreign currency derivatives | 13-24 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Embedded foreign currency derivatives | 25-36 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Embedded foreign currency derivatives | 37-48 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Embedded foreign currency derivatives | 49-60 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Embedded foreign currency derivatives | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Equity swap agreements    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount (10.4) (1.5)
Derivative financial instruments, undiscounted cash flows (10.4) (1.5)
Equity swap agreements | 0-12 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (10.4) (1.5)
Equity swap agreements | 13-24 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Equity swap agreements | 25-36 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Equity swap agreements | 37-48 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Equity swap agreements | 49-60 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Equity swap agreements | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows $ 0.0 $ 0.0