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SIGNIFICANT ACCOUNTING POLICIES - Landfill Accounting (Details) $ in Millions | 12 Months Ended
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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 |  |

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