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BUSINESS COMBINATIONS - Narrative (Details) - business	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Business Acquisition [Line Items]
Number of businesses acquired		6
Minimum
Business Acquisition [Line Items]
Useful life of finite lived intangible assets	4 years
Maximum
Business Acquisition [Line Items]
Useful life of finite lived intangible assets	10 years
Western | Tuck-in Solid Waste Collection Business
Business Acquisition [Line Items]
Number of businesses acquired	2	5
Resource solutions | Recycling Operation
Business Acquisition [Line Items]
Number of businesses acquired		1

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