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SIGNIFICANT ACCOUNTING POLICIES - Landfill Accounting and Non-Landfill Closure and Post-Closure Liabilities (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2025
USD ($)
cubic_yard
landfill_site
Dec. 31, 2024
USD ($)
cubic_yard
Dec. 31, 2023
USD ($)
cubic_yard
Property, Plant and Equipment [Line Items]      
Landfill sites | landfill_site 8    
Permitted, but not highly probable airspace (cubic yards) 0 0  
Remaining Airspace Capacity [Roll Forward]      
Remaining capacity, beginning of period (cubic yards) 26,951,000 27,753,000  
Changes in highly probable airspace, net (cubic yards) 10,909,000 0  
Consumed (cubic yards) (1,241,000) (802,000)  
Remaining capacity, end of period (cubic yards) 36,619,000 26,951,000 27,753,000
Landfill final closure and post-closure liabilities | $ $ 59.8 $ 59.4  
Regulatory post-closure period for landfill (in years) 30 years    
Asset retirement obligations, risk free rate (as a percent) 6.53% 6.57%  
Non-landfill closure and post-closure liabilities | $ $ 75.6 $ 70.4  
Minimum      
Remaining Airspace Capacity [Roll Forward]      
Non-landfill closure and post-closure liabilities, period (in years) 10 years    
Maximum      
Remaining Airspace Capacity [Roll Forward]      
Non-landfill closure and post-closure liabilities, period (in years) 30 years    
Buttonwillow | California      
Property, Plant and Equipment [Line Items]      
Remaining Lives (Years) 17 years    
Deer Trail | Colorado      
Property, Plant and Equipment [Line Items]      
Remaining Lives (Years) 16 years    
Grassy Mountain | Utah      
Property, Plant and Equipment [Line Items]      
Remaining Lives (Years) 36 years    
Kimball | Nebraska      
Property, Plant and Equipment [Line Items]      
Remaining Lives (Years) 21 years    
Lambton | Ontario, Canada      
Property, Plant and Equipment [Line Items]      
Remaining Lives (Years) 41 years    
Lone Mountain | Oklahoma      
Property, Plant and Equipment [Line Items]      
Remaining Lives (Years) 52 years    
Ryley | Alberta, Canada      
Property, Plant and Equipment [Line Items]      
Remaining Lives (Years) 47 years    
Sawyer | North Dakota      
Property, Plant and Equipment [Line Items]      
Remaining Lives (Years) 59 years    
Landfill assets      
Property, Plant and Equipment [Line Items]      
Amortization | $ $ 8.8 $ 10.6 $ 18.6
Permitted      
Property, Plant and Equipment [Line Items]      
Permitted Remaining Highly Probable Airspace (cubic yards) 36,619,000    
Permitted | Buttonwillow | California      
Property, Plant and Equipment [Line Items]      
Permitted Remaining Highly Probable Airspace (cubic yards) 4,597,000    
Permitted | Deer Trail | Colorado      
Property, Plant and Equipment [Line Items]      
Permitted Remaining Highly Probable Airspace (cubic yards) 1,271,000    
Permitted | Grassy Mountain | Utah      
Property, Plant and Equipment [Line Items]      
Permitted Remaining Highly Probable Airspace (cubic yards) 4,133,000    
Permitted | Kimball | Nebraska      
Property, Plant and Equipment [Line Items]      
Permitted Remaining Highly Probable Airspace (cubic yards) 496,000    
Permitted | Lambton | Ontario, Canada      
Property, Plant and Equipment [Line Items]      
Permitted Remaining Highly Probable Airspace (cubic yards) 3,983,000    
Permitted | Lone Mountain | Oklahoma      
Property, Plant and Equipment [Line Items]      
Permitted Remaining Highly Probable Airspace (cubic yards) 13,528,000    
Permitted | Ryley | Alberta, Canada      
Property, Plant and Equipment [Line Items]      
Permitted Remaining Highly Probable Airspace (cubic yards) 5,475,000    
Permitted | Sawyer | North Dakota      
Property, Plant and Equipment [Line Items]      
Permitted Remaining Highly Probable Airspace (cubic yards) 3,136,000