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SIGNIFICANT ACCOUNTING POLICIES - Landfill Accounting (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) cubic_yard cubicYard landfill_site | Dec. 31, 2020 USD ($) cubicYard cubic_yard landfill_site | Dec. 31, 2019 USD ($) cubicYard 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) | 24,716,000 | 28,494,000 | 29,760,000
Changes in highly probable airspace, net (cubic yards) | 0 | (2,962,000) | 0
Consumed (cubic yards) | (932,000) | (816,000) | (1,266,000)
Remaining capacity, end of period (cubic yards) | 23,784,000 | 24,716,000 | 28,494,000
Number of landfill sites closed during period | landfill_site |  | 2 |
Landfill final closure and post-closure liabilities | $ | $ 53.4 | $ 48.4 |
Regulatory post-closure period for landfill (in years) | 30 years |  |
Asset retirement obligations, inflation rate (as a percent) | 1.02% | 1.02% |
Asset retirement obligations, risk free rate (as a percent) | 4.84% | 5.60% |
Non-landfill closure and post-closure liabilities | $ | $ 45.7 | $ 39.5 |
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 Park | Texas |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 1 year |  |
Deer Trail | Colorado |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 26 years |  |
Grassy Mountain | Utah |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 40 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) | 48 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) | 3 years |  |
Sawyer | North Dakota |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining Lives (Years) | 84 years |  |
Altair |  |  |
Remaining Airspace Capacity [Roll Forward] |  |  |
Airspace consumed (in cubic yards) | cubicYard |  | 25,000 | 132,000
Westmorland |  |  |
Remaining Airspace Capacity [Roll Forward] |  |  |
Airspace consumed (in cubic yards) | cubicYard | 0 | 0 | 0
Landfill assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization | $ | $ 13.7 | $ 10.9 | $ 12.3
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 | 23,784,000 |  |
Permitted | Buttonwillow | California |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 5,500,000 |  |
Permitted | Deer Park | Texas |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 32,000 |  |
Permitted | Deer Trail | Colorado |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 1,572,000 |  |
Permitted | Grassy Mountain | Utah |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 4,608,000 |  |
Permitted | Kimball | Nebraska |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 120,000 |  |
Permitted | Lambton | Ontario, Canada |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 4,534,000 |  |
Permitted | Lone Mountain | Oklahoma |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 3,617,000 |  |
Permitted | Ryley | Alberta, Canada |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 455,000 |  |
Permitted | Sawyer | North Dakota |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Remaining highly probable airspace | 3,346,000 |  |

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