COMMITMENTS AND CONTINGENCIES - Superfund Proceedings (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) site	Dec. 31, 2020 USD ($)
Remedial Liabilities for Inactive Sites
Superfund Proceedings
Increase in estimated remedial liability | $		$ 3.3
Superfund Proceedings
Superfund Proceedings
Number of sites subject to proceedings under federal or state superfund laws	131
Number of sites owned by the entity subject to proceedings under federal or state superfund laws	6
Number of sites owned by third parties subject to proceedings under federal or state superfund laws	125
Number of sites for which environmental remediation expense is settled	30
Third party sites requiring expenditure on remediation	15
Number of sites for which environmental remediation expense is not required	80
Loss contingency, liability limit amount | $	$ 1.0
Number of sites which potential liability could exceed $1.0 million	3
Notices received from owners of third party sites seeking indemnification from the company	6
Certain other third party sites
Superfund Proceedings
Indemnification agreement with third party sites, sites	11
Safety-Kleen Sustainability Solutions
Superfund Proceedings
Notices received from owners of third party sites seeking indemnification from the company	17