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LANDFILL CLOSURE AND POST-CLOSURE OBLIGATIONS - Narrative (Details)
$ in Millions
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Disclosure of detailed information about property, plant and equipment    
Future landfill post-closure assets $ 28.3 $ 26.1
Landfill closure and post-closure obligations    
Disclosure of detailed information about property, plant and equipment    
Depreciation of property and equipment (inclusive of infrastructure and depreciation difference between risk free discount rate considered for ARO) $ 4.4 $ 7.8
Discount rate | CANADA | Landfill closure and post-closure obligations    
Disclosure of detailed information about property, plant and equipment    
Significant unobservable input, liabilities 3.02 3.28
Discount rate | UNITED STATES | Landfill closure and post-closure obligations    
Disclosure of detailed information about property, plant and equipment    
Significant unobservable input, liabilities 4.03 3.97
Inflation rate | CANADA | Landfill closure and post-closure obligations    
Disclosure of detailed information about property, plant and equipment    
Significant unobservable input, liabilities 2.60 2.38
Inflation rate | UNITED STATES | Landfill closure and post-closure obligations    
Disclosure of detailed information about property, plant and equipment    
Significant unobservable input, liabilities 2.82 2.63