LONG-TERM DEBT - Maturity (Details) - CAD ($) $ in Millions |
Dec. 31, 2023 |
Dec. 31, 2022 |
Dec. 31, 2021 |
|---|---|---|---|
| Disclosure of detailed information about borrowings [line items] | |||
| Borrowings | $ 8,836.9 | $ 9,266.8 | $ 8,001.8 |
| Cost | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Borrowings | 8,834.6 | $ 9,252.0 | |
| Cost | 2024 | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Borrowings | 9.7 | ||
| Cost | 2025 | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Borrowings | 1,680.6 | ||
| Cost | 2026 | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Borrowings | 855.8 | ||
| Cost | 2027 | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Borrowings | 999.0 | ||
| Cost | 2028 | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Borrowings | 2,247.5 | ||
| Cost | Thereafter | |||
| Disclosure of detailed information about borrowings [line items] | |||
| Borrowings | $ 3,042.0 |