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REVENUES (Tables)

12 Months Ended

Dec. 31, 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):

						For the year ended December 31, 2025
						Environmental Services						Safety-Kleen Sustainability Solutions						Corporate						Total
Primary Geographical Markets
United States						$	4,705,709					$	784,989					$	186					$	5,490,884
Canada						440,645						99,308						—						539,953
Total third-party revenues						$	5,146,354					$	884,297					$	186					$	6,030,837
Sources of Revenue
Technical Services						$	1,859,705					$	—					$	—					$	1,859,705
Industrial Services and Other						1,327,883						—						186						1,328,069
Field and Emergency Response Services						937,362						—						—						937,362
Safety-Kleen Environmental Services						1,021,404						290,423						—						1,311,827
Safety-Kleen Oil						—						593,874						—						593,874
Total third-party revenues						$	5,146,354					$	884,297					$	186					$	6,030,837

						For the year ended December 31, 2024
						Environmental Services						Safety-Kleen Sustainability Solutions						Corporate						Total
Primary Geographical Markets
United States						$	4,510,845					$	841,171					$	407					$	5,352,423
Canada						449,480						88,049						—						537,529
Total third-party revenues						$	4,960,325					$	929,220					$	407					$	5,889,952
Sources of Revenue
Technical Services						$	1,733,550					$	—					$	—					$	1,733,550
Industrial Services and Other						1,377,502						—						407						1,377,909
Field and Emergency Response Services						895,120						—						—						895,120
Safety-Kleen Environmental Services						954,153						229,730						—						1,183,883
Safety-Kleen Oil						—						699,490						—						699,490
Total third-party revenues						$	4,960,325					$	929,220					$	407					$	5,889,952

						For the year ended December 31, 2023
						Environmental Services						Safety-Kleen Sustainability Solutions						Corporate						Total
Primary Geographical Markets
United States						$	4,022,394					$	846,339					$	447					$	4,869,180
Canada						447,515						92,457						—						539,972
Total third-party revenues						$	4,469,909					$	938,796					$	447					$	5,409,152
Sources of Revenue
Technical Services						$	1,563,847					$	—					$	—					$	1,563,847
Industrial Services and Other						1,418,938						—						447						1,419,385
Field and Emergency Response Services						609,913						—						—						609,913
Safety-Kleen Environmental Services						877,211						224,830						—						1,102,041
Safety-Kleen Oil						—						713,966						—						713,966
Total third-party revenues						$	4,469,909					$	938,796					$	447					$	5,409,152

Schedule of Contract Balances

Contract Balances

(in thousands)						December 31, 2025						December 31, 2024
Receivables						$	1,044,137					$	1,015,357
Contract assets (unbilled receivables)						160,888						162,215
Contract liabilities (deferred revenue)						81,529						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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