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BUSINESS COMBINATIONS
 3 Months Ended
Mar. 31, 2021
Business Combinations [Abstract]  
BUSINESS COMBINATIONS BUSINESS COMBINATIONS
2021 Acquisition
On March 27, 2021, the Company acquired a privately-owned business for $22.9 million cash consideration. The acquired company increases the Safety-Kleen Sustainability Solutions segment's network within the south central United States. In connection with this acquisition, a preliminary goodwill amount of $15.9 million was recognized.
2020 Acquisition
On April 17, 2020, the Company acquired a privately-owned business for $8.8 million cash consideration. The acquired company expands the Safety-Kleen Sustainability Solutions segment's oil re-refining operations to the northeast United States. In connection with this acquisition, a preliminary goodwill amount of $1.4 million was recognized.