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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, 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 |  |

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