LONG-TERM DEBT - Changes in long-term debt (Details) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
|
| LONG-TERM DEBT | ||
| Balance at beginning of year | $ 7,582.3 | $ 7,609.9 |
| Net change under revolving facilities, net of financing costs | (364.0) | |
| Issuance of long-term debt, net of financing costs | 795.0 | 1,957.2 |
| Repayment of long-term debt | (1,440.9) | (1,900.3) |
| Foreign currency translation | (154.1) | 267.4 |
| Amortization of financing costs | 8.7 | 9.0 |
| Change in fair value related to hedged interest rate risk | 2.2 | |
| Other | 2.1 | 0.9 |
| Balance at end of year | $ 6,793.1 | $ 7,582.3 |