OPERATING SEGMENTS - Goodwill and Intangible Assets (Details) - Gross Revenue - CAD ($) $ in Millions |
Dec. 31, 2023 |
Dec. 31, 2022 |
|---|---|---|
| Disclosure of operating segments [line items] | ||
| Goodwill and indefinite life intangible assets | $ 8,751.5 | $ 9,022.1 |
| Solid Waste | Canada | ||
| Disclosure of operating segments [line items] | ||
| Goodwill and indefinite life intangible assets | 2,091.7 | 2,079.6 |
| Solid Waste | USA | ||
| Disclosure of operating segments [line items] | ||
| Goodwill and indefinite life intangible assets | 5,601.7 | 6,046.2 |
| Environmental Services | ||
| Disclosure of operating segments [line items] | ||
| Goodwill and indefinite life intangible assets | $ 1,058.1 | $ 896.3 |