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FINANCIAL RISK MANAGEMENT - Maturity Analysis (Details) - CAD ($)
$ in Millions
Mar. 31, 2024
Mar. 31, 2023
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount $ 3,937.2 $ 4,187.0
Contractual cash flows 5,128.1 5,330.3
Derivative financial instruments, carrying amount 20.3 27.1
Derivative financial instruments, undiscounted cash flows 30.5 27.7
Non-derivative financial liabilities and derivative financial instruments, carrying amount 3,957.5 4,214.1
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 5,158.6 5,358.0
Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 1,211.8 1,157.4
Derivative financial instruments, undiscounted cash flows 21.5 25.6
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 1,233.3 1,183.0
Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 444.4 671.7
Derivative financial instruments, undiscounted cash flows 2.4 0.9
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 446.8 672.6
Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 339.4 421.6
Derivative financial instruments, undiscounted cash flows 0.9 1.3
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 340.3 422.9
Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 321.3 316.5
Derivative financial instruments, undiscounted cash flows (0.1) 0.0
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 321.2 316.5
Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 763.3 697.4
Derivative financial instruments, undiscounted cash flows 5.8 (0.1)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 769.1 697.3
More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 2,047.9 2,065.7
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 2,047.9 2,065.7
Forward foreign currency contracts    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount 9.3 25.8
Outflow    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 2,916.5 2,119.4
Outflow | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 2,522.6 1,852.8
Outflow | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 302.0 186.3
Outflow | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 69.3 66.5
Outflow | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 20.4 13.8
Outflow | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 2.2 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 (2,905.7) (2,092.2)
Inflow | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (2,514.3) (1,832.5)
Inflow | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (299.2) (182.2)
Inflow | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (68.7) (64.1)
Inflow | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (21.1) (13.4)
Inflow | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (2.4) 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 (4.8) (10.5)
Derivative financial instruments, undiscounted cash flows 3.9 (11.3)
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 (2.6) (6.5)
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 (0.4) (3.2)
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 (1.1)
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 0.6 (0.4)
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 6.0 (0.1)
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 15.8 11.8
Derivative financial instruments, undiscounted cash flows 15.8 11.8
Equity swap agreements | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 15.8 11.8
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
Accounts payable and accrued liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 775.8 799.3
Contractual cash flows 775.8 799.3
Accounts payable and accrued liabilities | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 775.8 799.3
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 2,522.4 2,794.2
Contractual cash flows 2,522.4 2,794.2
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 253.7 133.4
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 265.0 486.7
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 174.1 264.2
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 164.1 171.5
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 644.1 562.7
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 1,021.4 1,175.7
Interest and accretion    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 0.0 0.0
Contractual cash flows 743.2 734.5
Interest and accretion | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 94.1 120.2
Interest and accretion | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 78.7 93.8
Interest and accretion | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 70.5 73.9
Interest and accretion | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 66.2 67.5
Interest and accretion | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 44.3 53.9
Interest and accretion | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 389.4 325.2
Lease liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 551.9 455.9
Contractual cash flows 922.0 724.6
Lease liabilities | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 88.2 104.5
Lease liabilities | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 75.9 62.7
Lease liabilities | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 72.1 55.9
Lease liabilities | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 62.5 51.5
Lease liabilities | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 53.0 47.6
Lease liabilities | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 570.3 402.4
Other non-current liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 87.1 137.6
Contractual cash flows 164.7 277.7
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 24.8 28.5
Other non-current liabilities | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 22.7 27.6
Other non-current liabilities | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 28.5 26.0
Other non-current liabilities | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 21.9 33.2
Other non-current liabilities | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows $ 66.8 $ 162.4