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FINANCIAL RISK MANAGEMENT - Maturity Analysis (Details) - CAD ($)
$ in Millions
Mar. 31, 2023
Mar. 31, 2022
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount $ 4,187.0 $ 3,898.3
Contractual cash flows 5,330.3 4,907.0
Derivative financial instruments, carrying amount 27.1 (10.5)
Derivative financial instruments, undiscounted cash flows 27.7 (6.3)
Non-derivative financial liabilities and derivative financial instruments, carrying amount 4,214.1 3,887.8
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 5,358.0 4,900.7
Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 1,157.4 1,034.3
Derivative financial instruments, undiscounted cash flows 25.6 (1.7)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 1,183.0 1,032.6
Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 671.7 527.8
Derivative financial instruments, undiscounted cash flows 0.9 (3.8)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 672.6 524.0
Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 421.6 378.5
Derivative financial instruments, undiscounted cash flows 1.3 (0.6)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 422.9 377.9
Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 316.5 368.0
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 316.5 368.0
Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 697.4 603.2
Derivative financial instruments, undiscounted cash flows (0.1) (0.2)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 697.3 603.0
More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 2,065.7 1,995.2
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 2,065.7 1,995.2
Accounts payable and accrued liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 799.3 696.6
Contractual cash flows 799.3 696.6
Accounts payable and accrued liabilities | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 799.3 696.6
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 (other than lease liabilities)    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 2,794.2 2,651.2
Contractual cash flows 2,794.2 2,651.2
Long-term debt (other than lease liabilities) | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 133.4 142.8
Long-term debt (other than lease liabilities) | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 486.7 345.3
Long-term debt (other than lease liabilities) | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 264.2 232.5
Long-term debt (other than lease liabilities) | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 171.5 238.4
Long-term debt (other than lease liabilities) | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 562.7 489.9
Long-term debt (other than lease liabilities) | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 1,175.7 1,202.3
Interest and accretion    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 0.0 0.0
Contractual cash flows 734.5 741.3
Interest and accretion | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 120.2 81.9
Interest and accretion | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 93.8 80.3
Interest and accretion | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 73.9 70.6
Interest and accretion | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 67.5 59.7
Interest and accretion | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 53.9 48.7
Interest and accretion | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 325.2 400.1
Lease liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 455.9 395.0
Contractual cash flows 724.6 487.8
Lease liabilities | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 104.5 113.0
Lease liabilities | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 62.7 66.7
Lease liabilities | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 55.9 44.2
Lease liabilities | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 51.5 39.1
Lease liabilities | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 47.6 34.4
Lease liabilities | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 402.4 190.4
Other non-current liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 137.6 155.5
Contractual cash flows 277.7 330.1
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 28.5 35.5
Other non-current liabilities | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 27.6 31.2
Other non-current liabilities | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 26.0 30.8
Other non-current liabilities | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 33.2 30.2
Other non-current liabilities | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 162.4 202.4
Forward foreign currency contracts    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount 25.8 (15.3)
Outflow    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 2,119.4 1,320.5
Outflow | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 1,852.8 1,175.3
Outflow | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 186.3 118.1
Outflow | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 66.5 15.4
Outflow | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 13.8 11.7
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 (2,092.2) (1,336.9)
Inflow | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (1,832.5) (1,188.6)
Inflow | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (182.2) (121.0)
Inflow | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (64.1) (15.7)
Inflow | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (13.4) (11.6)
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 (10.5) (8.2)
Derivative financial instruments, undiscounted cash flows (11.3) (2.9)
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 (6.5) (1.4)
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 (3.2) (0.9)
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 (1.1) (0.3)
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 (0.4) (0.1)
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 (0.1) (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 0.0
Equity swap agreements    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount 11.8 13.0
Derivative financial instruments, undiscounted cash flows 11.8 13.0
Equity swap agreements | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 11.8 13.0
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