REVENUES - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) source	Dec. 31, 2022 USD ($)
Disaggregation of Revenue [Line Items]
Deferred contract cost, recognition period	3 months
Deferred contracts costs | $	$ 29.9	$ 29.7
Environmental Services
Disaggregation of Revenue [Line Items]
Number of revenue sources	4
Safety-Kleen Sustainability Solutions
Disaggregation of Revenue [Line Items]
Number of revenue sources	2