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FINANCIAL RISK MANAGEMENT - Maturity Analysis (Details) - CAD ($)
$ in Millions
Mar. 31, 2021
Mar. 31, 2020
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, carrying amount $ 3,218.3 $ 4,196.3
Non-derivative financial liabilities, undiscounted cash flows 4,005.7 5,426.7
Derivative financial instruments, carrying amount (28.5) 94.6
Derivative financial instruments, undiscounted cash flows (28.9) 88.9
Non-derivative financial liabilities and derivative financial instruments, carrying amount 3,189.8 4,290.9
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 3,976.8 5,515.6
No later than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 966.3 1,006.3
Derivative financial instruments, undiscounted cash flows (18.6) 92.8
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 947.7 1,099.1
Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 267.4 604.9
Derivative financial instruments, undiscounted cash flows (7.0) 2.2
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 260.4 607.1
Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 271.0 596.0
Derivative financial instruments, undiscounted cash flows (2.4) (0.9)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 268.6 595.1
Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 351.1 415.5
Derivative financial instruments, undiscounted cash flows (0.6) (2.3)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 350.5 413.2
Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 182.4 372.5
Derivative financial instruments, undiscounted cash flows (0.2) (1.9)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 182.2 370.6
More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 1,967.5 2,431.5
Derivative financial instruments, undiscounted cash flows (0.1) (1.0)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 1,967.4 2,430.5
Accounts payable and accrued liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, carrying amount 674.9 709.1
Non-derivative financial liabilities, undiscounted cash flows 674.9 709.1
Accounts payable and accrued liabilities | No later than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 674.9 709.1
Accounts payable and accrued liabilities | Between 1 and 2 years    
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 | Between 2 and 3 years    
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 | Between 3 and 4 years    
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 | Between 4 and 5 years    
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 | More than 5 years    
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 2,358.0 3,305.2
Non-derivative financial liabilities, undiscounted cash flows 2,954.5 4,319.8
Long-term debt | No later than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 291.4 296.5
Long-term debt | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 238.1 555.1
Long-term debt | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 230.0 564.8
Long-term debt | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 320.0 383.4
Long-term debt | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 151.7 340.1
Long-term debt | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 1,723.3 2,179.9
Other non-current liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, carrying amount 185.4 182.0
Non-derivative financial liabilities, undiscounted cash flows 376.3 397.8
Other non-current liabilities | No later than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 0.0 0.7
Other non-current liabilities | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 29.3 49.8
Other non-current liabilities | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 41.0 31.2
Other non-current liabilities | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 31.1 32.1
Other non-current liabilities | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 30.7 32.4
Other non-current liabilities | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Non-derivative financial liabilities, undiscounted cash flows 244.2 251.6
Forward foreign currency contracts    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount (24.0) 38.8
Forward foreign currency contracts, outflow    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 2,449.7 1,862.5
Forward foreign currency contracts, outflow | No later than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 2,157.6 1,636.1
Forward foreign currency contracts, outflow | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 233.0 171.0
Forward foreign currency contracts, outflow | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 49.8 42.4
Forward foreign currency contracts, outflow | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 9.3 9.2
Forward foreign currency contracts, outflow | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 3.8
Forward foreign currency contracts, outflow | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Forward foreign currency contracts, inflow    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (2,475.3) (1,822.8)
Forward foreign currency contracts, inflow | No later than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (2,175.6) (1,606.6)
Forward foreign currency contracts, inflow | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (238.8) (164.8)
Forward foreign currency contracts, inflow | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (51.3) (39.4)
Forward foreign currency contracts, inflow | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (9.6) (8.5)
Forward foreign currency contracts, inflow | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 (3.5)
Forward foreign currency contracts, inflow | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Foreign currency and interest rate swap agreements    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount (5.1) 0.3
Derivative financial instruments, undiscounted cash flows (3.9) (6.3)
Foreign currency and interest rate swap agreements | No later than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1.2) 7.8
Foreign currency and interest rate swap agreements | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1.2) (4.0)
Foreign currency and interest rate swap agreements | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (0.9) (3.9)
Foreign currency and interest rate swap agreements | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (0.3) (3.0)
Foreign currency and interest rate swap agreements | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (0.2) (2.2)
Foreign currency and interest rate swap agreements | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (0.1) (1.0)
Equity swap agreements    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount 0.6 55.5
Derivative financial instruments, undiscounted cash flows 0.6 55.5
Equity swap agreements | No later than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.6 55.5
Equity swap agreements | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Equity swap agreements | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Equity swap agreements | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Equity swap agreements | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Equity swap agreements | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows $ 0.0 $ 0.0