SIGNIFICANT ACCOUNTING POLICIES - Landfill Accounting and Non-Landfill Closure and Post-Closure Liabilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) cubic_yard landfill_site	Dec. 31, 2023 USD ($) cubic_yard	Dec. 31, 2022 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)	27,753,000	28,270,000
Changes in highly probable airspace, net (cubic yards)	0	464,000
Consumed (cubic yards)	(802,000)	(981,000)
Remaining capacity, end of period (cubic yards)	26,951,000	27,753,000	28,270,000
Landfill final closure and post-closure liabilities | $	$ 59.4	$ 59.4
Regulatory post-closure period for landfill (in years)	30 years
Asset retirement obligations, risk free rate (as a percent)	6.57%	6.51%
Non-landfill closure and post-closure liabilities | $	$ 70.4	$ 59.2
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)	21 years
Deer Trail | Colorado
Property, Plant and Equipment [Line Items]
Remaining Lives (Years)	17 years
Grassy Mountain | Utah
Property, Plant and Equipment [Line Items]
Remaining Lives (Years)	37 years
Kimball | Nebraska
Property, Plant and Equipment [Line Items]
Remaining Lives (Years)	22 years
Lambton | Ontario, Canada
Property, Plant and Equipment [Line Items]
Remaining Lives (Years)	46 years
Lone Mountain | Oklahoma
Property, Plant and Equipment [Line Items]
Remaining Lives (Years)	13 years
Ryley | Alberta, Canada
Property, Plant and Equipment [Line Items]
Remaining Lives (Years)	40 years
Sawyer | North Dakota
Property, Plant and Equipment [Line Items]
Remaining Lives (Years)	61 years
Landfill assets
Property, Plant and Equipment [Line Items]
Amortization | $	$ 10.6	$ 18.6	$ 16.2
Permitted
Property, Plant and Equipment [Line Items]
Permitted Remaining Highly Probable Airspace (cubic yards)	26,951,000
Permitted | Buttonwillow | California
Property, Plant and Equipment [Line Items]
Permitted Remaining Highly Probable Airspace (cubic yards)	4,909,000
Permitted | Deer Trail | Colorado
Property, Plant and Equipment [Line Items]
Permitted Remaining Highly Probable Airspace (cubic yards)	1,347,000
Permitted | Grassy Mountain | Utah
Property, Plant and Equipment [Line Items]
Permitted Remaining Highly Probable Airspace (cubic yards)	4,253,000
Permitted | Kimball | Nebraska
Property, Plant and Equipment [Line Items]
Permitted Remaining Highly Probable Airspace (cubic yards)	520,000
Permitted | Lambton | Ontario, Canada
Property, Plant and Equipment [Line Items]
Permitted Remaining Highly Probable Airspace (cubic yards)	4,218,000
Permitted | Lone Mountain | Oklahoma
Property, Plant and Equipment [Line Items]
Permitted Remaining Highly Probable Airspace (cubic yards)	2,913,000
Permitted | Ryley | Alberta, Canada
Property, Plant and Equipment [Line Items]
Permitted Remaining Highly Probable Airspace (cubic yards)	5,594,000
Permitted | Sawyer | North Dakota
Property, Plant and Equipment [Line Items]
Permitted Remaining Highly Probable Airspace (cubic yards)	3,197,000