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SEGMENT REPORTING (Tables)

12 Months Ended

Dec. 31, 2025

Segment Reporting [Abstract]

Schedule of Reconciliation of Third Party Revenues to Direct Revenues

The following tables reconcile third-party revenues to direct revenues by Reportable Segment (in thousands):

			For the year ended December 31, 2025
			Environmental Services						Safety-Kleen Sustainability Solutions						Total Segment Revenues						Corporate						Total Consolidated Revenues
Third-party revenues			$	5,146,354					$	884,297					$	6,030,651					$	186					$	6,030,837
Intersegment revenues (expense), net			46,936						(46,936)						—						—						—
Direct revenues			$	5,193,290					$	837,361					$	6,030,651					$	186					$	6,030,837

			For the year ended December 31, 2024
			Environmental Services						Safety-Kleen Sustainability Solutions						Total Segment Revenues						Corporate						Total Consolidated Revenues
Third-party revenues			$	4,960,325					$	929,220					$	5,889,545					$	407					$	5,889,952
Intersegment revenues (expense), net			44,422						(44,422)						—						—						—
Direct revenues			$	5,004,747					$	884,798					$	5,889,545					$	407					$	5,889,952

			For the year ended December 31, 2023
			Environmental Services						Safety-Kleen Sustainability Solutions						Total Segment Revenues						Corporate						Total Consolidated Revenues
Third-party revenues			$	4,469,909					$	938,796					$	5,408,705					$	447					$	5,409,152
Intersegment revenues (expense), net			41,533						(41,533)						—						—						—
Direct revenues			$	4,511,442					$	897,263					$	5,408,705					$	447					$	5,409,152

Schedule of Reconciliation to Consolidated Statements of Income to Adjusted EBITDA

The tables below present total Reportable Segment Adjusted EBITDA and the relevant significant segment expenses provided to the CODM by reported segment (in thousands):

			For the year ended December 31, 2025
			Environmental Services						Safety-Kleen Sustainability Solutions						Total Reportable Segments
Direct Revenues			$	5,193,290					$	837,361					$	6,030,651
Cost of Revenues			3,461,985						626,918						4,088,903
Selling, General and Administrative Expenses			387,529						72,989						460,518
Total Reportable Segment Adjusted EBITDA			$	1,343,776					$	137,454					$	1,481,230

			For the year ended December 31, 2024
			Environmental Services						Safety-Kleen Sustainability Solutions						Total Reportable Segments
Direct Revenues			$	5,004,747					$	884,798					$	5,889,545
Cost of Revenues			3,366,022						659,217						4,025,239
Selling, General and Administrative Expenses			371,263						78,575						449,838
Total Reportable Segment Adjusted EBITDA			$	1,267,462					$	147,006					$	1,414,468

			For the year ended December 31, 2023
			Environmental Services						Safety-Kleen Sustainability Solutions						Total Reportable Segments
Direct Revenues			$	4,511,442					$	897,263					$	5,408,705
Cost of Revenues			3,063,043						646,301						3,709,344
Selling, General and Administrative Expenses			346,791						78,089						424,880
Total Reportable Segment Adjusted EBITDA			$	1,101,608					$	172,873					$	1,274,481

The following table presents Total Reportable Segment Adjusted EBITDA reconciled to income from operations before provision for income taxes (in thousands):

			For the years ended December 31,
			2025						2024						2023
Adjusted EBITDA:
Environmental Services			$	1,343,776					$	1,267,462					$	1,101,608
Safety-Kleen Sustainability Solutions			137,454						147,006						172,873
Total Reportable Segment Adjusted EBITDA			1,481,230						1,414,468						1,274,481
Reconciliation to Consolidated Statements of Operations:
Corporate Costs (1)			311,291						297,534						261,911
Accretion of environmental liabilities			14,326						13,456						13,667
Stock-based compensation			32,702						27,981						20,703
Depreciation and amortization			446,006						400,922						365,761
Third-party transaction related costs			3,533						—						—
Kimball startup costs			—						4,343						—
Income from operations			673,372						670,232						612,439
Other (income) expense, net			(5,200)						1,454						(2,315)
Loss on early extinguishment of debt			8,277						371						2,880
Gain on sale of businesses			(776)						—						—
Interest expense, net of interest income			143,104						134,964						108,595
Income from operations before provision for income taxes			$	527,967					$	533,443					$	503,279

___________________________________

(1) Corporate Costs include the revenue, cost of revenues and selling, general and administrative expenses not managed through the Company’s operating segments. These costs are not captured within the Company’s Reportable Segment Adjusted EBITDA but are included in the Company’s total Adjusted EBITDA balances.

Schedule of Segment Reporting Information, by Segment

The following table presents assets by reported segment and in the aggregate (in thousands):

			December 31, 2025						December 31, 2024
Property, plant and equipment, net
Environmental Services			$	1,929,643					$	1,865,611
Safety-Kleen Sustainability Solutions			492,400						463,538
Corporate			119,024						118,792
Total property, plant and equipment, net			$	2,541,067					$	2,447,941
Goodwill and Permits and other intangibles, net
Environmental Services
Goodwill			$	1,297,478					$	1,296,204
Permits and other intangibles, net			510,919						549,482
Total Environmental Services			1,808,397						1,845,686
Safety-Kleen Sustainability Solutions
Goodwill			$	181,572					$	180,995
Permits and other intangibles, net			142,108						152,505
Total Safety-Kleen Sustainability Solutions			323,680						333,500
Total			$	2,132,077					$	2,179,186

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

As of December 31, 2025 and 2024, the Company had property, plant and equipment, net of depreciation and amortization and permits and other intangible assets, net of amortization in the following geographic locations (in thousands, except percentages):

			December 31, 2025												December 31, 2024
			Total						% of Total						Total						% of Total
Property, plant and equipment, net
United States			$	2,331,260					91.7		%				$	2,249,155					91.9		%
Canada and other foreign			209,807						8.3						198,786						8.1
Total property, plant and equipment, net			$	2,541,067					100.0		%				$	2,447,941					100.0		%
Permits and other intangibles, net
United States			$	625,670					95.8		%				$	674,246					96.0		%
Canada			27,357						4.2						27,741						4.0
Total permits and other intangibles, net			$	653,027					100.0		%				$	701,987					100.0		%

Schedule of Long-lived Assets by Geographic Areas

The following table presents the total assets by geographical area (in thousands):

			December 31, 2025						December 31, 2024
United States			$	6,937,254					$	6,756,813
Canada and other foreign			686,802						620,465
Total			$	7,624,056					$	7,377,278

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