LONG-TERM DEBT - Changes in Long-Term Debt (Details) - CAD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2023 |
Dec. 31, 2022 |
|
| Borrowings [Roll Forward] | ||
| Balance, beginning of period | $ 9,266.8 | $ 8,001.8 |
| Cash flows | ||
| Issuance of long-term debt | 4,972.3 | 1,656.4 |
| Repayment of long-term debt | (5,365.1) | (904.5) |
| Payment of financing costs | (38.2) | (2.7) |
| Long-term debt via business combinations | 182.5 | 73.3 |
| Proceeds from termination of swap instrument | 17.3 | 0.0 |
| Non-cash changes | ||
| Accrued interest and other non-cash changes | 7.4 | 16.0 |
| Revaluation of foreign exchange | (217.1) | 504.3 |
| Fair value movements on cash flow hedges | 11.0 | (77.8) |
| Balance, end of period | $ 8,836.9 | $ 9,266.8 |