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FINANCIAL RISK MANAGEMENT - Maturity Analysis (Details) - CAD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount $ 4,476.2 $ 3,937.2
Contractual cash flows 5,671.3 5,128.1
Derivative financial instruments, carrying amount 39.7 20.3
Derivative financial instruments, undiscounted cash flows 72.3 30.5
Non-derivative financial liabilities and derivative financial instruments, carrying amount 4,515.9 3,957.5
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 5,743.6 5,158.6
Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 1,456.2 1,211.8
Derivative financial instruments, undiscounted cash flows 26.1 21.5
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 1,482.3 1,233.3
Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 667.8 444.4
Derivative financial instruments, undiscounted cash flows 11.9 2.4
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 679.7 446.8
Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 329.8 339.4
Derivative financial instruments, undiscounted cash flows 2.8 0.9
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 332.6 340.3
Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 834.4 321.3
Derivative financial instruments, undiscounted cash flows 31.5 (0.1)
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 865.9 321.2
Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 250.2 763.3
Derivative financial instruments, undiscounted cash flows 0.0 5.8
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 250.2 769.1
More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 2,132.9 2,047.9
Derivative financial instruments, undiscounted cash flows 0.0 0.0
Non-derivative financial liabilities and derivative financial instruments, undiscounted cash flows 2,132.9 2,047.9
Forward foreign currency contracts    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, carrying amount 38.3 9.3
Outflow    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 2,829.3 2,916.5
Outflow | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 2,481.4 2,522.6
Outflow | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 305.6 302.0
Outflow | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 39.4 69.3
Outflow | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows 2.9 20.4
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 2.2
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 (2,780.2) (2,905.7)
Inflow | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (2,443.3) (2,514.3)
Inflow | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (295.4) (299.2)
Inflow | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (38.5) (68.7)
Inflow | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (3.0) (21.1)
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 (2.4)
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 14.4 (4.8)
Derivative financial instruments, undiscounted cash flows 36.2 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 1.0 (2.6)
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 1.7 (0.4)
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 1.9 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 31.6 0.6
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 0.0 6.0
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 (13.0) 15.8
Derivative financial instruments, undiscounted cash flows (13.0) 15.8
Equity swap agreements | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Derivative financial instruments, undiscounted cash flows (13.0) 15.8
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 914.4 775.8
Contractual cash flows 914.4 775.8
Accounts payable and accrued liabilities | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 914.4 775.8
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 2,678.3 2,522.4
Contractual cash flows 2,678.3 2,522.4
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 277.9 253.7
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 469.3 265.0
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 140.6 174.1
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 654.5 164.1
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 121.7 644.1
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 1,014.3 1,021.4
Interest and accretion    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 0.0 0.0
Contractual cash flows 686.2 743.2
Interest and accretion | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 93.2 94.1
Interest and accretion | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 74.6 78.7
Interest and accretion | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 67.5 70.5
Interest and accretion | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 50.0 66.2
Interest and accretion | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 34.7 44.3
Interest and accretion | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 366.2 389.4
Lease liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 792.1 551.9
Contractual cash flows 1,237.2 922.0
Lease liabilities | Less than 1 year    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 170.7 88.2
Lease liabilities | Between 1 and 2 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 98.9 75.9
Lease liabilities | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 90.3 72.1
Lease liabilities | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 101.8 62.5
Lease liabilities | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 69.9 53.0
Lease liabilities | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 705.6 570.3
Other non-current liabilities    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Carrying amount 91.4 87.1
Contractual cash flows 155.2 164.7
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 25.0 24.8
Other non-current liabilities | Between 2 and 3 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 31.4 22.7
Other non-current liabilities | Between 3 and 4 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 28.1 28.5
Other non-current liabilities | Between 4 and 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows 23.9 21.9
Other non-current liabilities | More than 5 years    
Disclosure of maturity analysis for non-derivative financial liabilities [line items]    
Contractual cash flows $ 46.8 $ 66.8