SIGNIFICANT ACCOUNTING POLICIES - Landfill Accounting (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) cubic_yard landfill_site	Dec. 31, 2021 USD ($) cubic_yard	Dec. 31, 2020 USD ($) cubic_yard
Property, Plant and Equipment [Line Items]
Landfill sites | landfill_site	9
Permitted, but not highly probable airspace (cubic yards)	0	0
Remaining Airspace Capacity [Roll Forward]
Remaining capacity, beginning of period (cubic yards)	23,784,000	24,716,000
Changes in highly probable airspace, net (cubic yards)	5,579,000	0
Consumed (cubic yards)	(1,093,000)	(932,000)
Remaining capacity, end of period (cubic yards)	28,270,000	23,784,000	24,716,000
Landfill final closure and post-closure liabilities | $	$ 62.3	$ 53.4
Regulatory post-closure period for landfill (in years)	30 years
Asset retirement obligations, risk free rate (as a percent)	5.37%	4.84%
Non-landfill closure and post-closure liabilities | $	$ 56.6	$ 45.7
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)	20 years
Deer Trail | Colorado
Property, Plant and Equipment [Line Items]
Remaining Lives (Years)	23 years
Grassy Mountain | Utah
Property, Plant and Equipment [Line Items]
Remaining Lives (Years)	39 years
Kimball | Nebraska
Property, Plant and Equipment [Line Items]
Remaining Lives (Years)	5 years
Lambton | Ontario, Canada
Property, Plant and Equipment [Line Items]
Remaining Lives (Years)	47 years
Lone Mountain | Oklahoma
Property, Plant and Equipment [Line Items]
Remaining Lives (Years)	16 years
Ryley | Alberta, Canada
Property, Plant and Equipment [Line Items]
Remaining Lives (Years)	37 years
Sawyer | North Dakota
Property, Plant and Equipment [Line Items]
Remaining Lives (Years)	83 years
Landfill assets
Property, Plant and Equipment [Line Items]
Amortization | $	$ 16.2	$ 13.7	$ 10.9
Non-commercial landfills
Property, Plant and Equipment [Line Items]
Landfill sites | landfill_site	2
Permitted
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	28,270,000
Permitted | Buttonwillow | California
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	5,197,000
Permitted | Deer Trail | Colorado
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	1,488,000
Permitted | Grassy Mountain | Utah
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	4,454,000
Permitted | Kimball | Nebraska
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	116,000
Permitted | Lambton | Ontario, Canada
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	4,443,000
Permitted | Lone Mountain | Oklahoma
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	3,412,000
Permitted | Ryley | Alberta, Canada
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	5,851,000
Permitted | Sawyer | North Dakota
Property, Plant and Equipment [Line Items]
Remaining highly probable airspace	3,309,000