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REVENUES (Tables)

9 Months Ended

Sep. 30, 2025

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregation of Revenue

The following tables present the Company’s third-party revenue disaggregated by source of revenue and geography (in thousands):

						Three Months Ended September 30, 2025
						Environmental Services						Safety-Kleen Sustainability Solutions						Corporate						Total
Primary Geographical Markets
United States						$	1,194,300					$	202,483					$	—					$	1,396,783
Canada						124,280						28,274						—						152,554
Total third-party revenues						$	1,318,580					$	230,757					$	—					$	1,549,337
Sources of Revenue
Technical Services						$	490,768					$	—					$	—					$	490,768
Industrial Services						332,102						—						—						332,102
Field and Emergency Response Services						232,262						—						—						232,262
Safety-Kleen Environmental Services						263,448						76,601						—						340,049
Safety-Kleen Oil						—						154,156						—						154,156
Total third-party revenues						$	1,318,580					$	230,757					$	—					$	1,549,337

						Three Months Ended September 30, 2024
						Environmental Services						Safety-Kleen Sustainability Solutions						Corporate						Total
Primary Geographical Markets
United States						$	1,166,660					$	218,963					$	96					$	1,385,719
Canada						120,990						22,713						—						143,703
Total third-party revenues						$	1,287,650					$	241,676					$	96					$	1,529,422
Sources of Revenue
Technical Services						$	437,180					$	—					$	—					$	437,180
Industrial Services						345,573						—						96						345,669
Field and Emergency Response Services						260,200						—						—						260,200
Safety-Kleen Environmental Services						244,697						59,675						—						304,372
Safety-Kleen Oil						—						182,001						—						182,001
Total third-party revenues						$	1,287,650					$	241,676					$	96					$	1,529,422

						Nine Months Ended September 30, 2025
						Environmental Services						Safety-Kleen Sustainability Solutions						Corporate						Total
Primary Geographical Markets
United States						$	3,519,337					$	596,612					$	186					$	4,116,135
Canada						336,340						78,666						—						415,006
Total third-party revenues						$	3,855,677					$	675,278					$	186					$	4,531,141
Sources of Revenue
Technical Services						$	1,380,394					$	—					$	—					$	1,380,394
Industrial Services						1,016,040						—						186						1,016,226
Field and Emergency Response Services						690,755						—						—						690,755
Safety-Kleen Environmental Services						768,488						213,965						—						982,453
Safety-Kleen Oil						—						461,313						—						461,313
Total third-party revenues						$	3,855,677					$	675,278					$	186					$	4,531,141

						Nine Months Ended September 30, 2024
						Environmental Services						Safety-Kleen Sustainability Solutions						Corporate						Total
Primary Geographical Markets
United States						$	3,395,446					$	645,664					$	297					$	4,041,407
Canada						350,781						66,648						—						417,429
Total third-party revenues						$	3,746,227					$	712,312					$	297					$	4,458,836
Sources of Revenue
Technical Services						$	1,288,339					$	—					$	—					$	1,288,339
Industrial Services						1,064,441						—						297						1,064,738
Field and Emergency Response Services						676,562						—						—						676,562
Safety-Kleen Environmental Services						716,885						171,117						—						888,002
Safety-Kleen Oil						—						541,195						—						541,195
Total third-party revenues						$	3,746,227					$	712,312					$	297					$	4,458,836

Schedule of Contract Balances

(in thousands)						September 30, 2025						December 31, 2024
Receivables						$	1,104,805					$	1,015,357
Contract assets (unbilled receivables)						182,059						162,215
Contract liabilities (deferred revenue)						91,966						88,545

X

- Definition

Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

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- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-5

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