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FINANCIAL RISK MANAGEMENT - Maturity Analysis (Details) - CAD ($)
$ in Millions
Mar. 31, 2022
Mar. 31, 2021
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount $ 3,905.9 $ 3,218.3
Contractual cash flows 4,700.7 4,005.7
Derivative financial instruments, carrying amount (10.5) (28.5)
Derivative financial instruments, undiscounted cash flows (6.3) (28.9)
Non-derivative financial liabilities and derivative financial instruments, carrying amount 3,895.4 3,189.8
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 4,694.4 3,976.8
Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 1,034.2 966.3
Derivative financial instruments, undiscounted cash flows (1.7) (18.6)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 1,032.5 947.7
Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 527.8 267.4
Derivative financial instruments, undiscounted cash flows (3.8) (7.0)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 524.0 260.4
Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 378.5 271.0
Derivative financial instruments, undiscounted cash flows (0.6) (2.4)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 377.9 268.6
Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 368.1 351.1
Derivative financial instruments, undiscounted cash flows 0.0 (0.6)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 368.1 350.5
Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 603.2 182.4
Derivative financial instruments, undiscounted cash flows (0.2) (0.2)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 603.0 182.2
More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 1,788.9 1,967.5
Derivative financial instruments, undiscounted cash flows 0.0 (0.1)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 1,788.9 1,967.4
Accounts payable and accrued liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 696.6 674.9
Contractual cash flows 696.6 674.9
Accounts payable and accrued liabilities | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 696.6 674.9
Accounts payable and accrued liabilities | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual 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]    
Contractual 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]    
Contractual 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]    
Contractual 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]    
Contractual cash flows 0.0 0.0
Long-term debt    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 3,053.8 2,358.0
Contractual cash flows 3,674.0 2,954.5
Long-term debt | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 337.6 291.4
Long-term debt | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 492.3 238.1
Long-term debt | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 347.3 230.0
Long-term debt | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 337.3 320.0
Long-term debt | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 573.0 151.7
Long-term debt | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 1,586.5 1,723.3
Other non-current liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 155.5 185.4
Contractual cash flows 330.1 376.3
Other non-current liabilities | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 0.0 0.0
Other non-current liabilities | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 35.5 29.3
Other non-current liabilities | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 31.2 41.0
Other non-current liabilities | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 30.8 31.1
Other non-current liabilities | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 30.2 30.7
Other non-current liabilities | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 202.4 244.2
Forward foreign currency contracts    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount (15.3) (24.0)
Outflow    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 1,320.5 2,449.7
Outflow | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 1,175.3 2,157.6
Outflow | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 118.1 233.0
Outflow | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 15.4 49.8
Outflow | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 11.7 9.3
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 0.0
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
Inflow    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1,336.9) (2,475.3)
Inflow | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1,188.6) (2,175.6)
Inflow | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (121.0) (238.8)
Inflow | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (15.7) (51.3)
Inflow | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (11.6) (9.6)
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 0.0
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 (8.2) (5.1)
Derivative financial instruments, undiscounted cash flows (2.9) (3.9)
Foreign currency and interest rate swap agreements | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1.4) (1.2)
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 (0.9) (1.2)
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 (0.3) (0.9)
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 (0.1) (0.3)
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) (0.2)
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 0.0 (0.1)
Equity swap agreements    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount 13.0 0.6
Derivative financial instruments, undiscounted cash flows 13.0 0.6
Equity swap agreements | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 13.0 0.6
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