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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 |

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