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FINANCIAL RISK MANAGEMENT - Maturity Analysis (Details) - CAD ($)
$ in Millions
Mar. 31, 2018
Mar. 31, 2017
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, carrying amount $ 2,018.8 $ 2,019.8
Non-derivative financial liabilities, undiscounted cash flows 2,654.6 2,691.4
Derivative financial instruments, carrying amount (2.3) (19.2)
Derivative financial instruments, undiscounted cash flows (2.7) (19.2)
Non-derivative financial liabilities and derivative financial instruments, carrying amount 2,016.5 2,000.6
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 2,651.9 2,672.2
0-12 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 676.7 714.3
Derivative financial instruments, undiscounted cash flows 5.2 (7.4)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 681.9 706.9
13-24 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 280.9 99.5
Derivative financial instruments, undiscounted cash flows 0.0 (1.5)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 280.9 98.0
25-36 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 110.2 276.4
Derivative financial instruments, undiscounted cash flows (1.5) (0.4)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 108.7 276.0
37-48 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 255.2 103.6
Derivative financial instruments, undiscounted cash flows (1.5) (2.0)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 253.7 101.6
49-60 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 106.7 242.0
Derivative financial instruments, undiscounted cash flows (1.4) (1.9)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 105.3 240.1
Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 1,224.9 1,255.6
Derivative financial instruments, undiscounted cash flows (3.5) (6.0)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 1,221.4 1,249.6
Accounts payable and accrued liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, carrying amount 588.4 615.0
Non-derivative financial liabilities, undiscounted cash flows 588.4 615.0
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 588.4 615.0
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 1,262.9 1,258.2
Non-derivative financial liabilities, undiscounted cash flows 1,643.5 1,683.1
Long-term debt | 0-12 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 88.3 99.3
Long-term debt | 13-24 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 262.1 79.8
Long-term debt | 25-36 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 91.6 258.2
Long-term debt | 37-48 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 212.2 85.7
Long-term debt | 49-60 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 75.8 215.4
Long-term debt | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 913.5 944.7
Other non-current liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, carrying amount 167.5 146.6
Non-derivative financial liabilities, undiscounted cash flows 422.7 393.3
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 0.0 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 18.8 19.7
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 18.6 18.2
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 43.0 17.9
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 30.9 26.6
Other non-current liabilities | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 311.4 310.9
Forward foreign currency contracts    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount 10.8 1.6
Forward foreign currency contracts, outflow    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 1,351.4 1,380.4
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 1,146.5 1,140.5
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 162.0 167.1
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 22.4 63.9
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 12.8 8.2
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 6.7 0.7
Forward foreign currency contracts, outflow | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 1.0 0.0
Forward foreign currency contracts, inflow    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1,339.0) (1,375.8)
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 (1,136.7) (1,139.3)
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 (160.2) (165.7)
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 (22.1) (62.2)
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 (12.5) (8.1)
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 (6.4) (0.5)
Forward foreign currency contracts, inflow | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1.1) 0.0
Swap derivatives    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount (10.7) (16.0)
Derivative financial instruments, undiscounted cash flows (12.7) (19.0)
Swap derivatives | 0-12 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (2.2) (4.1)
Swap derivatives | 13-24 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1.8) (2.6)
Swap derivatives | 25-36 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1.8) (2.1)
Swap derivatives | 37-48 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1.8) (2.1)
Swap derivatives | 49-60 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1.7) (2.1)
Swap derivatives | Thereafter    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (3.4) (6.0)
Embedded foreign currency derivatives    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount (0.9) (1.8)
Derivative financial instruments, undiscounted cash flows (0.9) (1.8)
Embedded foreign currency derivatives | 0-12 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (0.9) (1.5)
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 (0.3)
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 (1.5) (3.0)
Derivative financial instruments, undiscounted cash flows (1.5) (3.0)
Equity swap agreements | 0-12 Months    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1.5) (3.0)
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