Waste Connections (WCN) 10-Q26 Oct 232023 Q3 Quarterly reportFinancial data

Company Profile

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2023	Oct. 13, 2023
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2023
Document Fiscal Year Focus	2023
Document Transition Report	false
Securities Act File Number	1-34370
Entity Registrant Name	WASTE CONNECTIONS, INC.
Entity Incorporation, State or Country Code	A6
Entity Tax Identification Number	98-1202763
Entity Address, Address Line One	6220 Hwy 7
Entity Address, Address Line Two	Suite 600
Entity Address, City or Town	Woodbridge
Entity Address, State or Province	ON
Entity Address, Country	CA
Entity Address, Postal Zip Code	L4H 4G3
City Area Code	905
Local Phone Number	532-7510
Title of 12(b) Security	Common Shares, no par value
Trading Symbol	WCN
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		257,643,341
Entity Central Index Key	0001318220
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q3
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current assets:
Cash and equivalents	$ 96,187	$ 78,637
Accounts receivable, net of allowance for credit losses of $23,970 and $22,939 at September 30, 2023 and December 31, 2022, respectively	868,093	833,862
Prepaid expenses and other current assets	187,442	205,146
Total current assets	1,151,722	1,117,645
Restricted cash	102,844	102,727
Restricted investments	75,990	68,099
Property and equipment, net	7,096,769	6,950,915
Operating lease right-of-use assets	263,491	192,506
Goodwill	7,313,084	6,902,297
Intangible assets, net	1,618,692	1,673,917
Other assets, net	108,648	126,497
Total assets	17,731,240	17,134,603
Current liabilities:
Accounts payable	604,542	638,728
Book overdraft	15,782	15,645
Deferred revenue	342,726	325,002
Accrued liabilities	446,436	431,247
Current portion of operating lease liabilities	32,677	35,170
Current portion of contingent consideration	100,813	60,092
Current portion of long-term debt and notes payable	32,760	6,759
Total current liabilities	1,575,736	1,512,643
Long-term portion of debt and notes payable	6,803,439	6,890,149
Long-term portion of operating lease liabilities	239,768	165,462
Long-term portion of contingent consideration	21,195	21,323
Deferred income taxes	1,048,283	1,013,742
Other long-term liabilities	451,524	417,640
Total liabilities	10,139,945	10,020,959
Commitments and contingencies (Note 18)
Equity:
Common shares: 257,640,960 shares issued and 257,581,304 shares outstanding at September 30, 2023; 257,211,175 shares issued and 257,145,716 shares outstanding at December 31, 2022	3,276,631	3,271,958
Additional paid-in capital	270,104	244,076
Accumulated other comprehensive loss	(49,262)	(56,830)
Treasury shares: 59,656 and 65,459 shares at September 30, 2023 and December 31, 2022, respectively
Retained earnings	4,088,726	3,649,494
Total Waste Connections' equity	7,586,199	7,108,698
Noncontrolling interest in subsidiaries	5,096	4,946
Total equity	7,591,295	7,113,644
Total liabilities and equity	$ 17,731,240	$ 17,134,603

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Statement Of Financial Position [Abstract]
Allowance for credit losses	$ 23,970	$ 22,939
Common shares, shares issued	257,640,960	257,211,175
Common shares, shares outstanding	257,581,304	257,145,716
Treasury shares	59,656	65,459

Condensed Consolidated Statemen

Condensed Consolidated Statements of Net Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Revenues	$ 2,064,744	$ 1,879,868	$ 5,986,342	$ 5,342,558
Operating expenses:
Cost of operations	1,204,603	1,120,629	3,548,893	3,198,039
Selling, general and administrative	196,316	186,887	606,367	518,705
Depreciation	214,966	193,287	632,347	562,174
Amortization of intangibles	39,405	38,859	117,740	113,956
Impairments and other operating items	56,477	13,438	69,201	19,467
Operating income	352,977	326,768	1,011,794	930,217
Interest expense	(69,016)	(51,161)	(204,914)	(137,565)
Interest income	2,833	1,784	6,886	2,574
Other income (expense), net	5,372	8,487	8,346	2,373
Income before income tax provision	292,166	285,878	822,112	797,599
Income tax provision	(62,975)	(48,753)	(185,915)	(155,899)
Net income	229,191	237,125	636,197	641,700
Plus (less): Net loss (income) attributable to noncontrolling interests	(165)	(213)	(150)	(390)
Net income attributable to Waste Connections	$ 229,026	$ 236,912	$ 636,047	$ 641,310
Earnings per common share attributable to Waste Connections' common shareholders:
Basic	$ 0.89	$ 0.92	$ 2.47	$ 2.49
Diluted	$ 0.89	$ 0.92	$ 2.46	$ 2.49
Shares used in the per share calculations:
Basic	257,633,703	257,197,010	257,535,408	257,438,756
Diluted	258,229,404	257,891,635	258,110,484	258,060,751
Cash dividends per common share	$ 0.255	$ 0.230	$ 0.765	$ 0.690

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net income	$ 229,191	$ 237,125	$ 636,197	$ 641,700
Other comprehensive income (loss), before tax:
Foreign currency translation adjustment	(50,020)	(145,955)	2,527	(185,030)
Other comprehensive income (loss), before tax	(47,518)	(117,328)	9,386	(100,717)
Income tax expense related to items of other comprehensive income (loss)	(663)	(7,586)	(1,818)	(22,343)
Other comprehensive income (loss), net of tax	(48,181)	(124,914)	7,568	(123,060)
Comprehensive income	181,010	112,211	643,765	518,640
Plus (less): Comprehensive loss (income) attributable to noncontrolling interests	(165)	(213)	(150)	(390)
Comprehensive income attributable to Waste Connections	180,845	111,998	643,615	518,250
Interest Rate Swap
Other comprehensive income (loss), before tax:
Interest rate swap amounts reclassified into interest expense	(5,286)	948	(14,120)	9,344
Changes in fair value of interest rate swaps	$ 7,788	$ 27,679	$ 20,979	$ 74,969

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Common Stock Deferred Compensation Plan	Common Stock Performance Shares	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Retained Earnings	Noncontrolling Interests	Total
Cumulative effect adjustment from adoption of new accounting pronouncement			$ 3,693,027	$ 199,482	$ 39,584		$ 3,056,845	$ 4,607	$ 6,993,545
Beginning Balances at Dec. 31, 2021			$ 3,693,027	199,482	39,584		3,056,845	4,607	6,993,545
Beginning Balances, shares at Dec. 31, 2021			260,212,496
Beginning Balance, treasury shares at Dec. 31, 2021						70,662
Sale of common shares held in trust			$ 305						305
Sale of common shares held in trust, shares			2,203			(2,203)
Vesting of restricted share units (shares)	19,149	57,677	312,706
Tax withholdings related to net share settlements of equity-based compensation				(17,236)					(17,236)
Tax withholdings related to net share settlements of equity-based compensation, shares			(143,243)
Equity-based compensation				14,139					14,139
Exercise of warrants			11,560
Repurchase of common shares (shares)			(3,388,155)
Repurchase of common shares			$ (424,999)						(424,999)
Issuance of shares under employee share purchase plan			$ 1,554						1,554
Issuance of shares under employee share purchase plan, shares			12,015
Cash dividends on common shares							(59,391)		(59,391)
Amounts reclassified into earnings, net of taxes					3,491				3,491
Changes in fair value of cash flow hedges, net of taxes					32,854				32,854
Foreign currency translation adjustment					34,429				34,429
Net income							180,324	44	180,368
Ending Balances at Mar. 31, 2022			$ 3,269,887	196,385	110,358		3,177,778	4,651	6,759,059
Ending Balances, shares at Mar. 31, 2022			257,096,408
Ending Balance, treasury shares at Mar. 31, 2022						68,459
Beginning Balances at Dec. 31, 2021			$ 3,693,027	199,482	39,584		3,056,845	4,607	$ 6,993,545
Beginning Balances, shares at Dec. 31, 2021			260,212,496
Beginning Balance, treasury shares at Dec. 31, 2021						70,662
Repurchase of common shares (shares)									(3,388,155)
Repurchase of common shares									$ (424,999)
Issuance of shares under employee share purchase plan									$ 3,271
Issuance of shares under employee share purchase plan, shares									26,582
Cash dividends on common shares									$ (177,710)
Foreign currency translation adjustment					(185,030)				(185,030)
Net income									641,700
Ending Balances at Sep. 30, 2022			$ 3,271,958	229,445	(83,476)		3,520,446	4,997	6,943,370
Ending Balances, shares at Sep. 30, 2022			257,118,204
Ending Balance, treasury shares at Sep. 30, 2022						65,459
Cumulative effect adjustment from adoption of new accounting pronouncement			$ 3,269,887	196,385	110,358		3,177,778	4,651	6,759,059
Beginning Balances at Mar. 31, 2022			$ 3,269,887	196,385	110,358		3,177,778	4,651	6,759,059
Beginning Balances, shares at Mar. 31, 2022			257,096,408
Beginning Balance, treasury shares at Mar. 31, 2022						68,459
Sale of common shares held in trust			$ 355						355
Sale of common shares held in trust, shares			3,000			(3,000)
Vesting of restricted share units (shares)			522
Tax withholdings related to net share settlements of equity-based compensation				(30)					(30)
Tax withholdings related to net share settlements of equity-based compensation, shares			(145)
Equity-based compensation				14,412					14,412
Exercise of warrants			806
Cash dividends on common shares							(59,421)		(59,421)
Amounts reclassified into earnings, net of taxes					2,680				2,680
Changes in fair value of cash flow hedges, net of taxes					1,904				1,904
Foreign currency translation adjustment					(73,504)				(73,504)
Net income							224,074	133	224,207
Ending Balances at Jun. 30, 2022			$ 3,270,242	210,767	41,438		3,342,431	4,784	6,869,662
Ending Balances, shares at Jun. 30, 2022			257,100,591
Ending Balance, treasury shares at Jun. 30, 2022						65,459
Cumulative effect adjustment from adoption of new accounting pronouncement			$ 3,270,242	210,767	41,438		3,342,431	4,784	6,869,662
Vesting of restricted share units (shares)	360		4,135
Tax withholdings related to net share settlements of equity-based compensation				(200)					(200)
Tax withholdings related to net share settlements of equity-based compensation, shares			(1,449)
Equity-based compensation				18,878					18,878
Issuance of shares under employee share purchase plan			$ 1,716						1,716
Issuance of shares under employee share purchase plan, shares			14,567
Cash dividends on common shares							(58,897)		(58,897)
Amounts reclassified into earnings, net of taxes					697				697
Changes in fair value of cash flow hedges, net of taxes					20,344				20,344
Foreign currency translation adjustment					(145,955)				(145,955)
Net income							236,912	213	237,125
Ending Balances at Sep. 30, 2022			$ 3,271,958	229,445	(83,476)		3,520,446	4,997	6,943,370
Ending Balances, shares at Sep. 30, 2022			257,118,204
Ending Balance, treasury shares at Sep. 30, 2022						65,459
Cumulative effect adjustment from adoption of new accounting pronouncement			$ 3,271,958	229,445	(83,476)		3,520,446	4,997	6,943,370
Cumulative effect adjustment from adoption of new accounting pronouncement			3,271,958	244,076	(56,830)		3,649,494	4,946	7,113,644
Beginning Balances at Dec. 31, 2022			$ 3,271,958	244,076	(56,830)		3,649,494	4,946	$ 7,113,644
Beginning Balances, shares at Dec. 31, 2022			257,145,716						257,145,716
Beginning Balance, treasury shares at Dec. 31, 2022						65,459			65,459
Sale of common shares held in trust			$ 765						$ 765
Sale of common shares held in trust, shares			5,803			(5,803)
Vesting of restricted share units (shares)	19,151	140,498	325,490
Tax withholdings related to net share settlements of equity-based compensation				(22,966)					(22,966)
Tax withholdings related to net share settlements of equity-based compensation, shares			(176,837)
Equity-based compensation				17,374					17,374
Exercise of warrants			13,019
Issuance of shares under employee share purchase plan			$ 1,841						1,841
Issuance of shares under employee share purchase plan, shares			14,594
Cash dividends on common shares							(65,788)		(65,788)
Amounts reclassified into earnings, net of taxes					(2,999)				(2,999)
Changes in fair value of cash flow hedges, net of taxes					(2,425)				(2,425)
Foreign currency translation adjustment					1,682				1,682
Net income							197,813	23	197,836
Ending Balances at Mar. 31, 2023			$ 3,274,564	238,484	(60,572)		3,781,519	4,969	7,238,964
Ending Balances, shares at Mar. 31, 2023			257,487,434
Ending Balance, treasury shares at Mar. 31, 2023						59,656
Beginning Balances at Dec. 31, 2022			$ 3,271,958	244,076	(56,830)		3,649,494	4,946	$ 7,113,644
Beginning Balances, shares at Dec. 31, 2022			257,145,716						257,145,716
Beginning Balance, treasury shares at Dec. 31, 2022						65,459			65,459
Repurchase of common shares (shares)									0
Issuance of shares under employee share purchase plan									$ 3,908
Issuance of shares under employee share purchase plan, shares									29,808
Cash dividends on common shares									$ (196,815)
Foreign currency translation adjustment					2,527				2,527
Net income									636,197
Ending Balances at Sep. 30, 2023			$ 3,276,631	270,104	(49,262)		4,088,726	5,096	$ 7,591,295
Ending Balances, shares at Sep. 30, 2023			257,581,304						257,581,304
Ending Balance, treasury shares at Sep. 30, 2023						59,656			59,656
Cumulative effect adjustment from adoption of new accounting pronouncement			$ 3,274,564	238,484	(60,572)		3,781,519	4,969	$ 7,238,964
Beginning Balances at Mar. 31, 2023			$ 3,274,564	238,484	(60,572)		3,781,519	4,969	7,238,964
Beginning Balances, shares at Mar. 31, 2023			257,487,434
Beginning Balance, treasury shares at Mar. 31, 2023						59,656
Vesting of restricted share units (shares)		55,167	43,431
Tax withholdings related to net share settlements of equity-based compensation				(5,709)					(5,709)
Tax withholdings related to net share settlements of equity-based compensation, shares			(62,304)
Equity-based compensation				22,892					22,892
Exercise of warrants			31,287
Cash dividends on common shares							(65,351)		(65,351)
Amounts reclassified into earnings, net of taxes					(3,494)				(3,494)
Changes in fair value of cash flow hedges, net of taxes					12,120				12,120
Foreign currency translation adjustment					50,865				50,865
Net income							209,208	(38)	209,170
Ending Balances at Jun. 30, 2023			$ 3,274,564	255,667	(1,081)		3,925,376	4,931	7,459,457
Ending Balances, shares at Jun. 30, 2023			257,555,015
Ending Balance, treasury shares at Jun. 30, 2023						59,656
Cumulative effect adjustment from adoption of new accounting pronouncement			$ 3,274,564	255,667	(1,081)		3,925,376	4,931	7,459,457
Vesting of restricted share units (shares)	142		1,845
Tax withholdings related to net share settlements of equity-based compensation				(740)					(740)
Tax withholdings related to net share settlements of equity-based compensation, shares			(22,917)
Equity-based compensation				15,177					15,177
Exercise of warrants			32,005
Issuance of shares under employee share purchase plan			$ 2,067						2,067
Issuance of shares under employee share purchase plan, shares			15,214
Cash dividends on common shares							(65,676)		(65,676)
Amounts reclassified into earnings, net of taxes					(3,885)				(3,885)
Changes in fair value of cash flow hedges, net of taxes					5,724				5,724
Foreign currency translation adjustment					(50,020)				(50,020)
Net income							229,026	165	229,191
Ending Balances at Sep. 30, 2023			$ 3,276,631	270,104	(49,262)		4,088,726	5,096	$ 7,591,295
Ending Balances, shares at Sep. 30, 2023			257,581,304						257,581,304
Ending Balance, treasury shares at Sep. 30, 2023						59,656			59,656
Cumulative effect adjustment from adoption of new accounting pronouncement			$ 3,276,631	$ 270,104	$ (49,262)		$ 4,088,726	$ 5,096	$ 7,591,295

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash flows from operating activities:
Net income	$ 636,197	$ 641,700
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on disposal of assets and impairments	37,470	11,503
Depreciation	632,347	562,174
Amortization of intangibles	117,740	113,956
Deferred income taxes, net of acquisitions	29,060	91,098
Current period provision for expected credit losses	13,363	11,097
Amortization of debt issuance costs	4,862	3,879
Share-based compensation	56,110	48,395
Interest accretion	14,827	13,218
Payment of contingent consideration recorded in earnings		(2,982)
Adjustments to contingent consideration	30,367	(1,030)
Other	(3,535)	(8,412)
Changes in operating assets and liabilities, net of effects from acquisitions:
Net change in operating assets and liabilities, net of acquisitions	2,068	15,541
Net cash provided by operating activities	1,570,876	1,500,137
Cash flows from investing activities:
Payments for acquisitions, net of cash acquired	(573,185)	(1,272,910)
Capital expenditures for property and equipment	(615,554)	(618,313)
Proceeds from disposal of assets	8,678	23,341
Other	(5,552)	9,296
Net cash used in investing activities	(1,185,613)	(1,858,586)
Cash flows from financing activities:
Proceeds from long-term debt	1,242,554	3,148,624
Principal payments on notes payable and long-term debt	(1,383,415)	(2,052,412)
Payment of contingent consideration recorded at acquisition date	(4,255)	(12,114)
Change in book overdraft	137	(5,983)
Payments for repurchase of common shares		(424,999)
Payments for cash dividends	(196,815)	(177,710)
Tax withholdings related to net share settlements of equity-based compensation	(29,415)	(17,466)
Debt issuance costs		(11,454)
Proceeds from issuance of shares under employee share purchase plan	3,908	3,271
Proceeds from sale of common shares held in trust	765	660
Net cash provided by (used in) financing activities	(366,536)	450,417
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,060)	(3,210)
Net increase in cash, cash equivalents and restricted cash	17,667	88,758
Cash, cash equivalents and restricted cash at beginning of period	181,364	219,615
Cash, cash equivalents and restricted cash at end of period	199,031	308,373
In connection with its acquisitions, the Company assumed liabilities as follows:
Payments for acquisitions, net of cash acquired	(573,185)	(1,272,910)
Liabilities assumed and notes payable issued to sellers of businesses acquired	$ 127,073	$ 179,126

Basis of Presentation and Summa

Basis of Presentation and Summary	9 Months Ended
Basis of Presentation and Summary	Sep. 30, 2023
Basis of Presentation and Summary [Abstract]
Basis of Presentation and Summary	1. The accompanying condensed consolidated financial statements relate to Waste Connections, Inc. and its subsidiaries (the “Company”) for the three and nine month periods ended September 30, 2023 and 2022. In the opinion of management, the accompanying balance sheets and related interim statements of net income, comprehensive income, cash flows and equity include all adjustments, consisting only of normal recurring items, necessary for their fair statement in conformity with U.S. generally accepted accounting principles (“GAAP”). Preparing financial statements requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues and expenses. Examples include accounting for landfills, self-insurance accruals, income taxes, allocation of acquisition purchase price, contingent consideration accruals and asset impairments. An additional area that involves estimation is when the Company estimates the amount of potential exposure it may have with respect to litigation, claims and assessments in accordance with the accounting guidance on contingencies. Actual results for all estimates could differ materially from the estimates and assumptions that the Company uses in the preparation of its condensed consolidated financial statements. Interim results are not necessarily indicative of results for a full year. These interim financial statements should be read in conjunction with the financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2022.

Reporting Currency

Reporting Currency	9 Months Ended
Reporting Currency	Sep. 30, 2023
Reporting Currency [Abstract]
Reporting Currency	2. The functional currency of the Company, as the parent corporate entity, and its operating subsidiaries in the United States, is the U.S. dollar. The functional currency of the Company’s Canadian operations is the Canadian dollar. The reporting currency of the Company is the U.S. dollar. The Company’s consolidated Canadian dollar financial position is translated to U.S. dollars by applying the foreign currency exchange rate in effect at the consolidated balance sheet date. The Company’s consolidated Canadian dollar results of operations and cash flows are translated to U.S. dollars by applying the average foreign currency exchange rate in effect during the reporting period. The resulting translation adjustments are included in other comprehensive income or loss. Gains and losses from foreign currency transactions are included in earnings for the period.

New Accounting Standards

New Accounting Standards	9 Months Ended
New Accounting Standards	Sep. 30, 2023
New Accounting Standards
New Accounting Standards and Reclassifications	3. Accounting Standards Pending Adoption Clawback of Executive Compensation Rules

Revenue

Revenue	9 Months Ended
Revenue	Sep. 30, 2023
Revenue [Abstract]
Revenue	4. The Company’s operations primarily consist of providing non-hazardous waste collection, transfer, disposal and recycling services, non-hazardous oil and natural gas exploration and production (“E&P”) waste treatment, recovery and disposal services and intermodal services. The following table disaggregates the Company’s revenues by service line for the periods indicated: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Commercial $ 630,641 $ 564,592 $ 1,848,723 $ 1,602,793 Residential 538,364 487,995 1,582,289 1,391,603 Industrial and construction roll off 343,740 315,904 1,002,085 870,949 Total collection 1,512,745 1,368,491 4,433,097 3,865,345 Landfill 390,330 345,215 1,116,707 984,700 Transfer 313,214 271,685 892,757 751,117 Recycling 36,103 48,246 105,724 178,845 E&P 62,066 56,995 172,431 154,706 Intermodal and other 44,984 47,604 122,655 139,605 Intercompany (294,698) (258,368) (857,029) (731,760) Total $ 2,064,744 $ 1,879,868 $ 5,986,342 $ 5,342,558 The factors that impact the timing and amount of revenue recognized for each service line may vary based on the nature of the service performed. Generally, the Company recognizes revenue at the time it performs a service. In the event that the Company bills for services in advance of performance, it recognizes deferred revenue for the amount billed and subsequently recognizes revenue at the time the service is provided. Substantially all of the deferred revenue recorded as of June 30, 2023 was recognized as revenue during the three months ended September 30, 2023 when the service was performed. See Note 11 for additional information regarding revenue by reportable segment. Contract Acquisition Costs The incremental direct costs of obtaining a contract, which consist of sales incentives, are recognized as Other assets in the Company’s Condensed Consolidated Balance Sheets, and are amortized to Selling, general and administrative expense over the estimated life of the relevant customer relationship, which ranges from one

Accounts Receivable

Accounts Receivable	9 Months Ended
Accounts Receivable	Sep. 30, 2023
Accounts Receivable [Abstract]
Accounts Receivable	5. ACCOUNTS RECEIVABLE Accounts receivable are recorded when billed or accrued and represent claims against third parties that will be settled in cash. The carrying value of the Company’s receivables, net of the allowance for credit losses, represents their estimated net realizable value. The allowance for credit losses is based on management’s assessment of the collectability of assets pooled together with similar risk characteristics. The Company monitors the collectability of its trade receivables as one overall pool due to all trade receivables having similar risk characteristics. The Company estimates its allowance for credit losses based on historical collection trends, the age of outstanding receivables, geographical location of the customer, existing economic conditions and reasonable forecasts. If events or changes in circumstances indicate that specific receivable balances may be impaired, further consideration is given to the collectability of those balances and the allowance is adjusted accordingly. Past-due receivable balances are written off when the Company’s internal collection efforts have been unsuccessful in collecting the amount due. The following is a rollforward of the Company’s allowance for credit losses for the periods indicated: Nine Months Ended September 30, 2023 2022 Beginning balance $ 22,939 $ 18,480 Current period provision for expected credit losses 13,363 11,097 Write-offs charged against the allowance (17,049) (12,866) Recoveries collected 4,711 3,912 Impact of changes in foreign currency 6 (111) Ending balance $ 23,970 $ 20,512

Landfill Accounting

Landfill Accounting	9 Months Ended
Landfill Accounting	Sep. 30, 2023
Landfill Accounting [Abstract]
Landfill Accounting	6 . At September 30, 2023, the Company’s landfills consisted of 91 owned landfills, five landfills operated under life-of-site operating agreements and seven landfills operated under limited-term operating agreements. The Company’s landfills had site costs with a net book value of $3,333,390 at September 30, 2023. For the Company’s landfills operated under limited-term operating agreements and life-of-site operating agreements, the owner of the property (generally a municipality) usually owns the permit and the Company operates the landfill for a contracted term. Where the contracted term is not the life of the landfill, the property owner is generally responsible for final capping, closure and post-closure obligations. The Company is responsible for all final capping, closure and post-closure liabilities at the landfills it operates under life-of-site operating agreements. The Company’s internal and third-party engineers perform surveys at least annually to estimate the remaining disposal capacity at its landfills. Many of the Company’s existing landfills have the potential for expanded disposal capacity beyond the amount currently permitted. The Company’s landfill depletion rates are based on the remaining disposal capacity, considering both permitted and probable expansion airspace, at the landfills it owns and landfills it operates, but does not own, under life-of-site agreements. The Company’s landfill depletion rate is based on the term of the operating agreement at its operated landfill that has capitalized expenditures. Expansion airspace consists of additional disposal capacity being pursued through means of an expansion that has not yet been permitted. Expansion airspace that meets certain criteria is included in the estimate of total landfill airspace. Based on remaining permitted capacity as of September 30, 2023, and projected annual disposal volumes, the average remaining landfill life for the Company’s owned landfills and landfills operated under life-of-site operating agreements is estimated to be approximately 33 years. As of September 30, 2023, the Company is seeking to expand permitted capacity at nine of its owned landfills and two landfills that it operates under life-of-site operating agreements, and considers the achievement of these expansions to be probable. Although the Company cannot be certain that all future expansions will be permitted as designed, the average remaining life, when considering remaining permitted capacity, probable expansion capacity and projected annual disposal volume, of the Company’s owned landfills and landfills operated under life-of-site operating agreements is approximately 36 years. The estimated remaining lives of the Company’s owned landfills and landfills operated under life-of-site operating agreements range from 2 to 308 years, with approximately 90% of the projected annual disposal volume from landfills with remaining lives of less than 70 years. During the nine months ended September 30, 2023 and 2022, the Company expensed $192,314 and $172,118, respectively, or an average of $5.11 and $4.88 per ton consumed, respectively, related to landfill depletion at owned landfills and landfills operated under life-of-site agreements. The Company reserves for estimated final capping, closure and post-closure maintenance obligations at the landfills it owns and landfills it operates under life-of-site operating agreements. The Company calculates the net present value of its final capping, closure and post-closure liabilities by estimating the total obligation in current dollars, inflating the obligation based upon the expected date of the expenditure and discounting the inflated total to its present value using a credit-adjusted risk-free rate. Any changes in expectations that result in an upward revision to the estimated undiscounted cash flows are treated as a new liability and are inflated and discounted at rates reflecting market conditions. Any changes in expectations that result in a downward revision (or no revision) to the estimated undiscounted cash flows result in a liability that is inflated and discounted at rates reflecting the market conditions at the time the cash flows were originally estimated. This policy results in the Company’s final capping, closure and post-closure liabilities being recorded in “layers.” The Company’s discount rate assumption for purposes of computing “layers” for final capping, closure and post-closure liabilities is based on its long-term credit adjusted risk-free rate. The Company’s discount rate assumption for purposes of computing 2023 and 2022 “layers” for final capping, closure and post-closure obligations is 5.50% for 2023 and ranged from 3.25% to 5.50% for 2022. The Company’s long-term inflation rate assumption is 2.75% for the year ending December 31, 2023 and ranged from 2.25% to 2.75% for the year ending December 31, 2022. The resulting final capping, closure and post-closure obligations are recorded on the Condensed Consolidated Balance Sheets along with an offsetting addition to site costs which is amortized to depletion expense as the remaining landfill airspace is consumed. Interest is accreted on the recorded liability using the corresponding discount rate. During the nine months ended September 30, 2023 and 2022, the Company expensed $13,554 and $12,008, respectively, or an average of $0.36 and $0.34 per ton consumed, respectively, related to final capping, closure and post-closure accretion expense. The following is a reconciliation of the Company’s final capping, closure and post-closure liability balance from December 31, 2022 to September 30, 2023: Final capping, closure and post-closure liability at December 31, 2022 $ 344,606 Liability adjustments 25,542 Accretion expense associated with landfill obligations 13,554 Closure payments (14,864) Assumption of closure liabilities from acquisitions 7,687 Foreign currency translation adjustment 56 Final capping, closure and post-closure liability at September 30, 2023 $ 376,581 Liability adjustments of $25,542 for the nine months ended September 30, 2023, represent non-cash changes to final capping, closure and post-closure liabilities and are recorded on the Condensed Consolidated Balance Sheets along with an offsetting addition to site costs, which is amortized to depletion expense as the remaining landfill airspace is consumed. The final capping, closure and post-closure liability is included in Other long-term liabilities in the Condensed Consolidated Balance Sheets. The Company performs its annual review of its cost and capacity estimates in the first quarter of each year. At September 30, 2023 and December 31, 2022, $7,197 and $6,890, respectively, of the Company’s restricted cash balance and $64,090 and $57,469, respectively, of the Company’s restricted investments balance was for purposes of securing its performance of future final capping, closure and post-closure obligations.

Acquisitions

Acquisitions	9 Months Ended
Acquisitions	Sep. 30, 2023
Acquisitions [Abstract]
Acquisitions	7. The Company acquired nine individually immaterial non-hazardous solid waste collection, transfer, recycling and disposal businesses and one E&P landfill during the nine months ended September 30, 2023. The total transaction-related expenses incurred during the nine months ended September 30, 2023 for these acquisitions were $7,014. These expenses are included in Selling, general and administrative expenses in the Company’s Condensed Consolidated Statements of Net Income. The Company acquired 15 individually immaterial non-hazardous solid waste collection, transfer, recycling and disposal businesses during the nine months ended September 30, 2022. The total transaction-related expenses incurred during the nine months ended September 30, 2022 for these acquisitions were $18,694. These expenses are included in Selling, general and administrative expenses in the Company’s Condensed Consolidated Statements of Net Income. The results of operations of the acquired businesses have been included in the Company’s Condensed Consolidated Financial Statements from their respective acquisition dates. The Company expects these acquired businesses to contribute towards the achievement of the Company’s strategy to expand through acquisitions. Goodwill acquired is attributable to the synergies and ancillary growth opportunities expected to arise after the Company’s acquisition of these businesses. The following table summarizes the consideration transferred to acquire these businesses and the preliminary amounts of identifiable assets acquired and liabilities assumed at the acquisition dates for the acquisitions consummated in the nine months ended September 30, 2023 and 2022: 2023 2022 Acquisitions Acquisitions Fair value of consideration transferred: Cash $ 573,185 $ 1,272,910 Debt assumed 73,397 96,814 646,582 1,369,724 Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired: Accounts receivable 15,412 32,329 Prepaid expenses and other current assets 4,474 6,549 Restricted investments 5,462 — Operating lease right-of-use assets 14,048 3,160 Property and equipment 186,130 617,267 Long-term franchise agreements and contracts 59,509 109,364 Customer lists 5,020 69,378 Permits and other intangibles 2,403 97,548 Other assets 24 — Accounts payable and accrued liabilities (11,005) (34,905) Current portion of operating lease liabilities (366) (1,100) Deferred revenue (1,333) (7,766) Contingent consideration (13,350) (6,543) Long-term portion of operating lease liabilities (13,682) (2,060) Other long-term liabilities (10,439) (3,498) Deferred income taxes (3,501) (26,440) Total identifiable net assets 238,806 853,283 Goodwill $ 407,776 $ 516,441 Goodwill acquired during the nine months ended September 30, 2023 and 2022, totaling $317,190 and $272,186, respectively, is expected to be deductible for tax purposes. The fair value of acquired working capital related to four individually immaterial acquisitions completed during the twelve months ended September 30, 2023, is provisional pending receipt of information from the acquirees to support the fair value of the assets acquired and liabilities assumed. Any adjustments recorded relating to finalizing the working capital for these four acquisitions are not expected to be material to the Company’s financial position. The gross amount of trade receivables due under contracts acquired during the nine months ended September 30, 2023, was $15,538, of which $126 was expected to be uncollectible. The gross amount of trade receivables due under contracts acquired during the nine months ended September 30, 2022, was $37,486, of which $5,157 was expected to be uncollectible. The Company did not acquire any other class of receivable as a result of the acquisition of these businesses.

Intangible Assets, Net

Intangible Assets, Net	9 Months Ended
Intangible Assets, Net	Sep. 30, 2023
Intangible Assets, Net [Abstract]
Intangible Assets, Net	8. Intangible assets, exclusive of goodwill, consisted of the following at September 30, 2023: Gross Accumulated Net Carrying Accumulated Impairment Carrying Amount Amortization Loss Amount Finite-lived intangible assets: Long-term franchise agreements and contracts $ 963,690 $ (338,262) $ — $ 625,428 Customer lists 780,712 (577,744) — 202,968 Permits and other 782,252 (132,785) (40,784) 608,683 2,526,654 (1,048,791) (40,784) 1,437,079 Indefinite-lived intangible assets: Solid waste collection and transportation permits 181,613 — — 181,613 Intangible assets, exclusive of goodwill $ 2,708,267 $ (1,048,791) $ (40,784) $ 1,618,692 The weighted-average amortization period of long-term franchise agreements and contracts acquired during the nine months ended September 30, 2023 was 20.5 years. The weighted-average amortization period of customer lists acquired during the nine months ended September 30, 2023 was 11.7 years. The weighted-average amortization period of finite-lived permits and other acquired during the nine months ended September 30, 2023 was 40.0 years. Intangible assets, exclusive of goodwill, consisted of the following at December 31, 2022: Gross Accumulated Net Carrying Accumulated Impairment Carrying Amount Amortization Loss Amount Finite-lived intangible assets: Long-term franchise agreements and contracts $ 916,582 $ (297,382) $ — $ 619,200 Customer lists 776,719 (527,425) — 249,294 Permits and other 779,689 (115,095) (40,784) 623,810 2,472,990 (939,902) (40,784) 1,492,304 Indefinite-lived intangible assets: Solid waste collection and transportation permits 181,613 — — 181,613 Intangible assets, exclusive of goodwill $ 2,654,603 $ (939,902) $ (40,784) $ 1,673,917 Estimated future amortization expense for the next five years relating to finite-lived intangible assets owned as of September 30, 2023 is as follows: For the year ending December 31, 2023 $ 157,219 For the year ending December 31, 2024 $ 139,959 For the year ending December 31, 2025 $ 123,027 For the year ending December 31, 2026 $ 107,340 For the year ending December 31, 2027 $ 93,670

Leases

Leases	9 Months Ended
Leases	Sep. 30, 2023
Lessee Disclosure [Abstract]
Leases	9. The Company rents certain equipment and facilities under short-term agreements, non-cancelable operating lease agreements and finance leases. The Company determines if an arrangement is or contains a lease at contract inception. The Company recognizes a right-of-use (“ROU”) asset and a lease liability at the lease commencement date. The lease liability is initially measured at the present value of the unpaid lease payments at the lease commencement date. Key estimates and judgments include how the Company determines (1) the discount rate it uses to discount the unpaid lease payments to present value, (2) lease term and (3) lease payments. The lease guidance requires a lessee to discount its unpaid lease payments using the interest rate implicit in the lease or, if that rate cannot be readily determined, its incremental borrowing rate. Generally, the Company cannot determine the interest rate implicit in the lease because it does not have access to the lessor’s estimated residual value or the amount of the lessor’s deferred initial direct costs. Therefore, the Company generally uses its incremental borrowing rate as the discount rate for the lease. The Company’s incremental borrowing rate for a lease is the rate of interest it would have to pay on a collateralized basis to borrow an amount equal to the lease payments under similar terms. The lease term for the Company’s leases includes the noncancelable period of the lease, plus any additional periods covered by either a Company option to extend (or not to terminate) the lease that the Company is reasonably certain to exercise, or an option to extend (or not to terminate) the lease controlled by the lessor. Lease payments included in the measurement of the lease liability comprise fixed payments or variable lease payments. The variable lease payments take into account annual changes in the consumer price index and common area maintenance charges, if known. ROU assets for operating and finance leases are periodically reviewed for impairment losses. The Company uses the long-lived asset impairment guidance in ASC Subtopic 360-10, Property, Plant, and Equipment – Overall, to determine whether an ROU asset is impaired, and if so, the amount of the impairment loss to recognize. The Company did not recognize an impairment charge for any of its ROU assets during the nine months ended September 30, 2023 and 2022. The Company monitors for events or changes in circumstances that require a reassessment of one of its leases. When a reassessment results in the remeasurement of a lease liability, a corresponding adjustment is made to the carrying amount of the corresponding ROU asset. The Company did not recognize any significant remeasurements during the nine months ended September 30, 2023 and 2022. The Company has elected not to recognize ROU assets and lease liabilities for short-term leases that have a lease term of 12 months or less. The Company has elected to apply the short-term lease recognition and measurement exemption allowed for in the lease accounting standard. The Company recognizes the lease payments associated with its short-term leases as an expense on a straight-line basis over the lease term. Lease cost for operating and finance leases for the three and nine months ended September 30, 2023 and 2022 were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Operating lease cost $ 11,914 $ 9,822 $ 34,881 $ 30,814 Finance lease cost: Amortization of leased assets 733 682 2,098 1,802 Interest on leased liabilities 63 61 168 161 Total lease cost $ 12,710 $ 10,565 $ 37,147 $ 32,777 Supplemental cash flow information and non-cash activity related to the Company’s leases are as follows: Nine Months Ended September 30, 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 33,967 $ 30,313 Operating cash flows from finance leases $ 168 $ 161 Financing cash flows from finance leases $ 2,079 $ 1,758 Non-cash activity: Right-of-use assets obtained in exchange for lease liabilities - operating leases $ 85,377 $ 53,967 Right-of-use assets obtained in exchange for lease liabilities - finance leases $ 1,388 $ 3,369 Weighted-average remaining lease term and discount rate for the Company’s leases are as follows: Nine Months Ended September 30, 2023 2022 Weighted average remaining lease term - operating leases 11.1 years 8.9 years Weighted average remaining lease term - finance leases 3.9 years 4.4 years Weighted average discount rate - operating leases 3.92 % 2.96 % Weighted average discount rate - finance leases 2.35 % 1.96 % As of September 30, 2023, future minimum lease payments, reconciled to the respective lease liabilities, are as follows: Operating Leases Finance Leases Last 3 months of 2023 $ 11,634 $ 798 2024 40,695 3,194 2025 34,940 3,194 2026 32,313 2,608 2027 31,270 1,186 Thereafter 198,782 293 Minimum lease payments 349,634 11,273 Less: imputed interest (77,189) (501) Present value of minimum lease payments 272,445 10,772 Less: current portion of lease liabilities (32,677) (2,962) Long-term portion of lease liabilities $ 239,768 $ 7,810

Long-Term Debt

Long-Term Debt	9 Months Ended
Long-Term Debt	Sep. 30, 2023
Long-Term Debt [Abstract]
Long-Term Debt	10. The following table presents the Company’s long-term debt at September 30, 2023 and December 31, 2022: September 30, December 31, 2023 2022 Revolver under Credit Agreement, bearing interest ranging from 6.38% to 8.50% (a) $ 531,618 $ 614,705 Term loan under Credit Agreement, bearing interest at 6.43% (a) 650,000 650,000 Term loan under Term Loan Agreement, bearing interest at 6.43% (a) 800,000 800,000 4.25% Senior Notes due 2028 500,000 500,000 3.50% Senior Notes due 2029 500,000 500,000 2.60% Senior Notes due 2030 600,000 600,000 2.20% Senior Notes due 2032 650,000 650,000 3.20% Senior Notes due 2032 500,000 500,000 4.20% Senior Notes due 2033 750,000 750,000 3.05% Senior Notes due 2050 500,000 500,000 2.95% Senior Notes due 2052 850,000 850,000 Notes payable to sellers and other third parties, bearing interest ranging from 2.42% to 10.35%, principal and interest payments due periodically with due dates ranging from 2024 to 2036 (a) 56,047 37,232 Finance leases, bearing interest ranging from 1.89% to 5.07%, with lease expiration dates ranging from 2026 to 2029 (a) 10,772 11,464 6,898,437 6,963,401 Less – current portion (32,760) (6,759) Less – unamortized debt discount and issuance costs (62,238) (66,493) Long-term portion of debt and notes payable $ 6,803,439 $ 6,890,149 ____________________ (a) Interest rates represent the interest rates at September 30, 2023. Credit Agreement Details of the Credit Agreement are as follows: September 30, December 31, 2023 2022 Revolver under Credit Agreement Available $ 1,278,859 $ 1,193,502 Letters of credit outstanding $ 39,523 $ 41,793 Total amount drawn, as follows: $ 531,618 $ 614,705 Amount drawn – U.S. Term SOFR rate loan $ 335,000 $ 391,000 Interest rate applicable – U.S. Term SOFR rate loan 6.43 % 5.42 % Amount drawn – U.S. Term SOFR rate loan $ 30,000 $ — Interest rate applicable – U.S. Term SOFR rate loan 6.42 % — % Amount drawn – U.S. base rate loan $ 15,000 $ — Interest rate applicable – U.S. base rate loan 8.50 % — % Amount drawn – Canadian prime rate loan $ 11,094 $ — Interest rate applicable - Canadian prime rate loan 7.20 % — % Amount drawn – Canadian bankers’ acceptance $ 85,054 $ 223,705 Interest rate applicable – Canadian bankers’ acceptance 6.38 % 5.74 % Amount drawn – Canadian bankers’ acceptance $ 55,470 $ — Interest rate applicable – Canadian bankers’ acceptance 6.38 % — % Commitment – rate applicable 0.09 % 0.09 % Term loan under Credit Agreement Amount drawn – U.S. Term SOFR rate loan $ 650,000 $ 650,000 Interest rate applicable – U.S. Term SOFR rate loan 6.43 % 5.42 % In addition to the $39,523 of letters of credit at September 30, 2023 issued and outstanding under the Credit Agreement, the Company has issued and outstanding letters of credit totaling $102,229 under facilities other than the Credit Agreement.

Segment Reporting

Segment Reporting	9 Months Ended
Segment Reporting	Sep. 30, 2023
Segment Reporting [Abstract]
Segment Reporting	11. The Company’s revenues are generated from the collection, transfer, recycling and disposal of non-hazardous solid waste and the treatment, recovery and disposal of non-hazardous E&P waste. No single contract or customer accounted for more than 10% of the Company’s total revenues at the consolidated or reportable segment level during the periods presented. Effective April 1, 2023, the Company modified its organizational structure under new regional operating segments as the result of continued growth in its business. The Company now reports revenue and segment EBITDA based on the following six geographic solid waste operating segments: Southern, Western, Central, Eastern, Canada and MidSouth. A small number of operating locations have been reallocated from the Western segment to the Central segment, the previous Eastern segment has been bifurcated into two smaller geographies now referred to as the Eastern segment and MidSouth segment, and a small number of operating locations have been reallocated from the Southern segment to the MidSouth segment. The Company’s six geographic solid waste operating segments comprise its reportable segments. Each operating segment is responsible for managing several vertically integrated operations, which are comprised of districts. While certain corporate or regional overhead expense allocations may affect comparability on a period-over-period basis, the segment information presented herein reflects the realignment of these regions. The Company’s Chief Operating Decision Maker evaluates operating segment profitability and determines resource allocations based on several factors, of which the primary financial measure is segment EBITDA. The Company defines segment EBITDA as earnings before interest, taxes, depreciation, amortization, impairments and other operating items, and other income (expense). Segment EBITDA is not a measure of operating income, operating performance or liquidity under GAAP and may not be comparable to similarly titled measures reported by other companies. The Company’s management uses segment EBITDA in the evaluation of segment operating performance as it is a profit measure that is generally within the control of the operating segments. A reconciliation of segment EBITDA to Income before income tax provision is included at the end of this Note 11. Summarized financial information concerning the Company’s reportable segments for the three and nine months ended September 30, 2023 and 2022, is shown in the following tables: Three Months Ended Intercompany Reported Segment September 30, 2023 Revenue Revenue (b) Revenue EBITDA (c) Southern $ 465,134 $ (51,556) $ 413,578 $ 133,072 Western 486,351 (53,889) 432,462 124,433 Central 419,169 (46,307) 372,862 137,823 Eastern 420,855 (67,746) 353,109 100,779 Canada 292,351 (29,256) 263,095 108,524 MidSouth 275,582 (45,944) 229,638 61,923 Corporate (a) — — — (2,729) $ 2,359,442 $ (294,698) $ 2,064,744 $ 663,825 Three Months Ended Intercompany Reported Segment September 30, 2022 Revenue Revenue (b) Revenue EBITDA (c) Southern $ 429,787 $ (46,350) $ 383,437 $ 122,472 Western 412,928 (42,739) 370,189 109,736 Central 380,756 (41,867) 338,889 122,471 Eastern 385,204 (55,946) 329,258 77,384 Canada 270,041 (27,727) 242,314 87,910 MidSouth 259,520 (43,739) 215,781 64,036 Corporate (a) — — — (11,657) $ 2,138,236 $ (258,368) $ 1,879,868 $ 572,352 Nine Months Ended Intercompany Reported Segment September 30, 2023 Revenue Revenue (b) Revenue EBITDA (c) Southern $ 1,382,681 $ (155,149) $ 1,227,532 $ 384,660 Western 1,402,628 (155,355) 1,247,273 354,682 Central 1,218,670 (136,638) 1,082,032 384,538 Eastern 1,215,266 (189,604) 1,025,662 260,569 Canada 824,303 (85,347) 738,956 286,703 MidSouth 799,823 (134,936) 664,887 182,072 Corporate (a) — — — (22,142) $ 6,843,371 $ (857,029) $ 5,986,342 $ 1,831,082 Nine Months Ended Intercompany Reported Segment September 30, 2022 Revenue Revenue (b) Revenue EBITDA (c) Southern $ 1,232,302 $ (129,003) $ 1,103,299 $ 341,006 Western 1,179,592 (129,159) 1,050,433 315,114 Central 1,067,991 (113,854) 954,137 333,866 Eastern 1,064,236 (154,322) 909,914 214,335 Canada 789,531 (82,127) 707,404 265,402 MidSouth 740,666 (123,295) 617,371 175,133 Corporate (a) — — — (19,042) $ 6,074,318 $ (731,760) $ 5,342,558 $ 1,625,814 ____________________ (a) The majority of Corporate expenses are allocated to the six operating segments. Direct acquisition expenses, expenses associated with common shares held in the deferred compensation plan exchanged for other investment options and share-based compensation expenses associated with Progressive Waste share-based grants outstanding at June 1, 2016 that were continued by the Company are not allocated to the six operating segments and comprise the net EBITDA of the Company’s Corporate segment for the periods presented. (b) Intercompany revenues reflect each segment’s total intercompany sales, including intercompany sales within a segment and between segments. Transactions within and between segments are made on a basis intended to reflect the market value of the service. (c) For those items included in the determination of segment EBITDA, the accounting policies of the segments are the same as those described in the Company’s most recent Annual Report on Form 10-K. Total assets for each of the Company’s reportable segments at September 30, 2023 and December 31, 2022, were as follows: September 30, December 31, 2023 2022 Southern $ 3,478,012 $ 3,410,888 Western 3,409,663 3,239,679 Central 2,801,263 2,803,853 Eastern 3,156,943 2,752,436 Canada 2,734,397 2,773,882 MidSouth 1,705,300 1,727,323 Corporate 445,662 426,542 Total Assets $ 17,731,240 $ 17,134,603 The following tables show changes in goodwill during the nine months ended September 30, 2023 and 2022, by reportable segment: Southern Western Central Eastern Canada MidSouth Total Balance as of December 31, 2022 $ 1,547,894 $ 732,335 $ 1,003,470 $ 1,189,111 $ 1,684,670 $ 744,817 $ 6,902,297 Goodwill acquired — 45,072 3,605 361,398 — 1,366 411,441 Goodwill acquisition adjustments (1,450) — — — (2,215) — (3,665) Impact of changes in foreign currency — — — — 3,011 — 3,011 Balance as of September 30, 2023 $ 1,546,444 $ 777,407 $ 1,007,075 $ 1,550,509 $ 1,685,466 $ 746,183 $ 7,313,084 Southern Western Central Eastern Canada MidSouth Total Balance as of December 31, 2021 $ 1,457,437 $ 503,223 $ 931,269 $ 992,578 $ 1,559,512 $ 743,624 $ 6,187,643 Goodwill acquired 85,004 — 73,787 181,671 167,926 — 508,388 Goodwill acquisition adjustments — 8,060 — — — (7) 8,053 Impact of changes in foreign currency — — — — (129,224) — (129,224) Balance as of September 30, 2022 $ 1,542,441 $ 511,283 $ 1,005,056 $ 1,174,249 $ 1,598,214 $ 743,617 $ 6,574,860 A reconciliation of the Company’s primary measure of segment profitability (segment EBITDA) to Income before income tax provision in the Condensed Consolidated Statements of Net Income is as follows: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Southern segment EBITDA $ 133,072 $ 122,472 $ 384,660 $ 341,006 Western segment EBITDA 124,433 109,736 354,682 315,114 Central segment EBITDA 137,823 122,471 384,538 333,866 Eastern segment EBITDA 100,779 77,384 260,569 214,335 Canada segment EBITDA 108,524 87,910 286,703 265,402 MidSouth segment EBITDA 61,923 64,036 182,072 175,133 Subtotal reportable segments 666,554 584,009 1,853,224 1,644,856 Unallocated corporate overhead (2,729) (11,657) (22,142) (19,042) Depreciation (214,966) (193,287) (632,347) (562,174) Amortization of intangibles (39,405) (38,859) (117,740) (113,956) Impairments and other operating items (56,477) (13,438) (69,201) (19,467) Interest expense (69,016) (51,161) (204,914) (137,565) Interest income 2,833 1,784 6,886 2,574 Other income, net 5,372 8,487 8,346 2,373 Income before income tax provision $ 292,166 $ 285,878 $ 822,112 $ 797,599

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
Derivative Financial Instruments	Sep. 30, 2023
Derivative Financial Instruments [Abstract]
Derivative Financial Instruments	12. The Company recognizes all derivatives on the Condensed Consolidated Balance Sheets at fair value. All of the Company’s derivatives have been designated as cash flow hedges; therefore, the gain or loss on the derivatives will be recognized in accumulated other comprehensive income (loss) (“AOCIL”) and reclassified into earnings in the same period during which the hedged transaction affects earnings and is presented in the same income statement line item as the earnings effect of the hedged item. The Company classifies cash inflows and outflows from derivatives within operating activities on the Condensed Consolidated Statements of Cash Flows. One of the Company’s objectives for utilizing derivative instruments is to reduce its exposure to fluctuations in cash flows due to changes in the variable interest rates of certain borrowings under the Credit Agreement. The Company’s strategy to achieve that objective involves entering into interest rate swaps. The interest rate swaps outstanding at September 30, 2023 were specifically designated to the Credit Agreement and accounted for as cash flow hedges. At September 30, 2023, the Company’s derivative instruments included four interest rate swap agreements as follows: Fixed Variable Notional Interest Interest Rate Date Entered Amount Rate Paid (a) Received Effective Date (b) Expiration Date August 2017 $ 200,000 2.1230 % 1-month Term SOFR November 2022 October 2025 June 2018 $ 200,000 2.8480 % 1-month Term SOFR November 2022 October 2025 June 2018 $ 200,000 2.8284 % 1-month Term SOFR November 2022 October 2025 December 2018 $ 200,000 2.7715 % 1-month Term SOFR November 2022 July 2027 ____________________ (a) Plus applicable margin. (b) In October 2022, the Company amended the reference rate in all of its outstanding interest rate swap contracts to replace One-Month LIBOR with One-Month Term SOFR and certain credit spread adjustments. The Company did not record any gains or losses upon the conversion of the reference rates in these interest rate swap contracts, and the Company believes these amendments will not have a material impact on its Condensed Consolidated Financial Statements. The fair values of derivative instruments designated as cash flow hedges at September 30, 2023, were as follows: Derivatives Designated as Cash Asset Derivatives Liability Derivatives Flow Hedges Balance Sheet Location Fair Value Balance Sheet Location Fair Value Interest rate swaps Prepaid expenses and other current assets (a) $ 21,166 Accrued liabilities $ — Other assets, net 17,499 Total derivatives designated as cash flow hedges $ 38,665 $ — ____________________ (a) Represents the estimated amount of the existing unrealized gains on interest rate swaps at September 30, 2023 (based on the interest rate yield curve at that date), included in AOCIL expected to be reclassified into pre-tax earnings within the next 12 months. The actual amounts reclassified into earnings are dependent on future movements in interest rates. The fair values of derivative instruments designated as cash flow hedges at December 31, 2022, were as follows: Derivatives Designated as Cash Asset Derivatives Liability Derivatives Flow Hedges Balance Sheet Location Fair Value Balance Sheet Location Fair Value Interest rate swaps Prepaid expenses and other current assets $ 17,906 Accrued liabilities $ — Other assets, net 13,901 Total derivatives designated as cash flow hedges $ 31,807 $ — The following table summarizes the impact of the Company’s cash flow hedges on the results of operations, comprehensive income (loss) and AOCIL for the three and nine months ended September 30, 2023 and 2022: Derivatives Statement of Amount of (Gain) or Loss Reclassified Designated as Cash Amount of Gain or (Loss) Recognized Net Income from AOCIL into Earnings, Flow Hedges as AOCIL on Derivatives, Net of Tax (a) Classification Net of Tax (b) Three Months Ended Three Months Ended September 30, September 30, 2023 2022 2023 2022 Interest rate swaps $ 5,724 $ 20,344 Interest expense $ (3,885) $ 697 Derivatives Statement of Amount of (Gain) or Loss Reclassified Designated as Cash Amount of Gain or (Loss) Recognized Net Income from AOCIL into Earnings, Flow Hedges as AOCIL on Derivatives, Net of Tax (a) Classification Net of Tax (b) Nine Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Interest rate swaps $ 15,419 $ 55,102 Interest expense $ (10,378) $ 6,868 ____________________ (a) In accordance with the derivatives and hedging guidance, the changes in fair values of interest rate swaps have been recorded in equity as a component of AOCIL. As the critical terms of the interest rate swaps match the underlying debt being hedged, all unrealized changes in fair value are recorded in AOCIL. (b) Amounts reclassified from AOCIL into earnings related to realized gains and losses on interest rate swaps are recognized when interest payments or receipts occur related to the swap contracts, which correspond to when interest payments are made on the Company’s hedged debt. See Note 16 for further discussion on the impact of the Company’s hedge accounting to its consolidated comprehensive income (loss) and AOCIL.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
Fair Value of Financial Instruments	Sep. 30, 2023
Fair Value [Abstract]
Fair Value of Financial Instruments	13. The Company’s financial instruments consist primarily of cash and equivalents, trade receivables, restricted cash and investments, trade payables, debt instruments, contingent consideration obligations and interest rate swaps. As of September 30, 2023 and December 31, 2022, the carrying values of cash and equivalents, trade receivables, restricted cash and investments, trade payables and contingent consideration are considered to be representative of their respective fair values. The carrying values of the Company’s debt instruments, excluding certain notes as listed in the table below, approximate their fair values as of September 30, 2023 and December 31, 2022, based on current borrowing rates, current remaining average life to maturity and borrower credit quality for similar types of borrowing arrangements, and are classified as Level 2 within the fair value hierarchy. The carrying values and fair values of the Company’s debt instruments where the carrying values do not approximate their fair values as of September 30, 2023 and December 31, 2022, are as follows: Carrying Value at Fair Value (a) at September 30, December 31, September 30, December 31, 2023 2022 2023 2022 4.25% Senior Notes due 2028 $ 500,000 $ 500,000 $ 472,450 $ 470,850 3.50% Senior Notes due 2029 $ 500,000 $ 500,000 $ 453,600 $ 457,650 2.60% Senior Notes due 2030 $ 600,000 $ 600,000 $ 504,060 $ 510,540 2.20% Senior Notes due 2032 $ 650,000 $ 650,000 $ 500,045 $ 514,540 3.20% Senior Notes due 2032 $ 500,000 $ 500,000 $ 414,250 $ 429,000 4.20% Senior Notes due 2033 $ 750,000 $ 750,000 $ 668,475 $ 699,450 3.05% Senior Notes due 2050 $ 500,000 $ 500,000 $ 316,250 $ 343,300 2.95% Senior Notes due 2052 $ 850,000 $ 850,000 $ 516,035 $ 561,425 ____________________ (a) Senior Notes are classified as Level 2 within the fair value hierarchy. Fair value inputs include third-party calculations of the market interest rate of notes with similar ratings in similar industries over the remaining note terms. For details on the fair value of the Company’s interest rate swaps, restricted cash and investments and contingent consideration, refer to Note 15.

Net Income Per Share Informatio

Net Income Per Share Information	9 Months Ended
Net Income Per Share Information	Sep. 30, 2023
Net Income Per Share Information [Abstract]
Net Income Per Share Information	14. The following table sets forth the calculation of the numerator and denominator used in the computation of basic and diluted net income per common share attributable to the Company’s shareholders for the three and nine months ended September 30, 2023 and 2022: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Numerator: Net income attributable to Waste Connections for basic and diluted earnings per share $ 229,026 $ 236,912 $ 636,047 $ 641,310 Denominator: Basic shares outstanding 257,633,703 257,197,010 257,535,408 257,438,756 Dilutive effect of equity-based awards 595,701 694,625 575,076 621,995 Diluted shares outstanding 258,229,404 257,891,635 258,110,484 258,060,751

Fair Value Measurements

Fair Value Measurements	9 Months Ended
Fair Value Measurements	Sep. 30, 2023
Fair Value [Abstract]
Fair Value Measurements	15. The Company uses a three-tier fair value hierarchy to classify and disclose all assets and liabilities measured at fair value on a recurring basis in periods subsequent to their initial measurement. These tiers include: Level 1, defined as quoted market prices in active markets for identical assets or liabilities; Level 2, defined as inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active, model-based valuation techniques for which all significant assumptions are observable in the market, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and Level 3, defined as unobservable inputs that are not corroborated by market data. The Company’s financial assets and liabilities recorded at fair value on a recurring basis include derivative instruments and restricted cash and investments. At September 30, 2023 and December 31, 2022, the Company’s derivative instruments included pay-fixed, receive-variable interest rate swaps. The Company’s interest rate swaps are recorded at their estimated fair values based on quotes received from financial institutions that trade these contracts. The Company verifies the reasonableness of these quotes using similar quotes from another financial institution as of each date for which financial statements are prepared. For the Company’s interest rate swaps, the Company also considers the Company’s creditworthiness in its determination of the fair value measurement of these instruments in a net liability position and the counterparties’ creditworthiness in its determination of the fair value measurement of these instruments in a net asset position. The Company’s restricted cash is valued at quoted market prices in active markets for identical assets, which the Company receives from the financial institutions that hold such investments on its behalf. The Company’s restricted cash measured at fair value is invested primarily in money market accounts, bank time deposits and U.S. government and agency securities. The Company’s restricted investments are valued at quoted market prices in active markets for similar assets, which the Company receives from the financial institutions that hold such investments on its behalf. The Company’s restricted investments measured at fair value are invested primarily in money market accounts, bank time deposits, U.S. government and agency securities and Canadian bankers’ acceptance notes. The Company’s assets and liabilities measured at fair value on a recurring basis at September 30, 2023 and December 31, 2022, were as follows: Fair Value Measurement at September 30, 2023 Using Quoted Prices in Significant Active Markets Other Significant for Identical Observable Unobservable Assets Inputs Inputs Total (Level 1) (Level 2) (Level 3) Interest rate swap derivative instruments – net asset position $ 38,665 $ — $ 38,665 $ — Restricted cash $ 102,844 $ 102,844 $ — $ — Restricted investments $ 75,618 $ — $ 75,618 $ — Contingent consideration $ (122,008) $ — $ — $ (122,008) Fair Value Measurement at December 31, 2022 Using Quoted Prices in Significant Active Markets Other Significant for Identical Observable Unobservable Assets Inputs Inputs Total (Level 1) (Level 2) (Level 3) Interest rate swap derivative instruments – net asset position $ 31,807 $ — $ 31,807 $ — Restricted cash $ 102,727 $ 102,727 $ — $ — Restricted investments $ 66,402 $ — $ 66,402 $ — Contingent consideration $ (81,415) $ — $ — $ (81,415) The following table summarizes the changes in the fair value for Level 3 liabilities related to contingent consideration for the nine months ended September 30, 2023 and 2022: Nine Months Ended September 30, 2023 2022 Beginning balance $ 81,415 $ 94,308 Contingent consideration recorded at acquisition date 13,350 6,543 Payment of contingent consideration recorded at acquisition date (4,255) (12,114) Payment of contingent consideration recorded in earnings — (2,982) Adjustments to contingent consideration 30,367 (1,030) Interest accretion expense 1,131 1,073 Foreign currency translation adjustment — (35) Ending balance $ 122,008 $ 85,763

Other Comprehensive Income (Los

Other Comprehensive Income (Loss)	9 Months Ended
Other Comprehensive Income (Loss)	Sep. 30, 2023
Other Comprehensive Income (Loss) [Abstract]
Other Comprehensive Income (Loss)	16. Other comprehensive income (loss) includes changes in the fair value of interest rate swaps that qualify for hedge accounting. The components of other comprehensive income (loss) and related tax effects for the three and nine months ended September 30, 2023 and 2022 are as follows: Three Months Ended September 30, 2023 Gross Tax Effect Net of Tax Interest rate swap amounts reclassified into interest expense $ (5,286) $ 1,401 $ (3,885) Changes in fair value of interest rate swaps 7,788 (2,064) 5,724 Foreign currency translation adjustment (50,020) — (50,020) $ (47,518) $ (663) $ (48,181) Three Months Ended September 30, 2022 Gross Tax Effect Net of Tax Interest rate swap amounts reclassified into interest expense $ 948 $ (251) $ 697 Changes in fair value of interest rate swaps 27,679 (7,335) 20,344 Foreign currency translation adjustment (145,955) — (145,955) $ (117,328) $ (7,586) $ (124,914) Nine Months Ended September 30, 2023 Gross Tax Effect Net of Tax Interest rate swap amounts reclassified into interest expense $ (14,120) $ 3,742 $ (10,378) Changes in fair value of interest rate swaps 20,979 (5,560) 15,419 Foreign currency translation adjustment 2,527 — 2,527 $ 9,386 $ (1,818) $ 7,568 Nine Months Ended September 30, 2022 Gross Tax Effect Net of Tax Interest rate swap amounts reclassified into interest expense $ 9,344 $ (2,476) $ 6,868 Changes in fair value of interest rate swaps 74,969 (19,867) 55,102 Foreign currency translation adjustment (185,030) — (185,030) $ (100,717) $ (22,343) $ (123,060) A rollforward of the amounts included in AOCIL, net of taxes, for the nine months ended September 30, 2023 and 2022, is as follows: Foreign Accumulated Currency Other Interest Translation Comprehensive Rate Swaps Adjustment Income (Loss) Balance at December 31, 2022 $ 23,378 $ (80,208) $ (56,830) Amounts reclassified into earnings (10,378) — (10,378) Changes in fair value 15,419 — 15,419 Foreign currency translation adjustment — 2,527 2,527 Balance at September 30, 2023 $ 28,419 $ (77,681) $ (49,262) Foreign Accumulated Currency Other Interest Translation Comprehensive Rate Swaps Adjustment Income (Loss) Balance at December 31, 2021 $ (37,544) $ 77,128 $ 39,584 Amounts reclassified into earnings 6,868 — 6,868 Changes in fair value 55,102 — 55,102 Foreign currency translation adjustment — (185,030) (185,030) Balance at September 30, 2022 $ 24,426 $ (107,902) $ (83,476) See Note 12 for further discussion on the Company’s derivative instruments.

Shareholders' Equity

Shareholders' Equity	9 Months Ended
Shareholders' Equity	Sep. 30, 2023
Shareholders' Equity [Abstract]
Shareholders' Equity	17. Share-Based Compensation Restricted Share Units A summary of activity related to restricted share units (“RSUs”) during the nine-month period ended September 30, 2023, is presented below: Unvested Shares Outstanding at December 31, 2022 955,999 Granted 414,309 Forfeited (45,090) Vested and issued (370,766) Outstanding at September 30, 2023 954,452 The weighted average grant-date fair value per share for the common shares underlying the RSUs granted during the nine-month period ended September 30, 2023 was $133.65. Recipients of the Company’s RSUs who participate in the Company’s Nonqualified Deferred Compensation Plan may have elected in years prior to 2015 to defer some or all of their RSUs as they vest until a specified date or dates they choose. At the end of the deferral periods, unless a qualified participant makes certain other elections, the Company issues to recipients who deferred their RSUs common shares of the Company underlying the deferred RSUs. At September 30, 2023 and 2022, the Company had 62,059 and 81,352 vested deferred RSUs outstanding, respectively. Performance-Based Restricted Share Units A summary of activity related to performance-based restricted share units (“PSUs”) during the nine-month period ended September 30, 2023, is presented below: Unvested Shares Outstanding at December 31, 2022 341,850 Granted 113,347 Vested and issued (195,665) Outstanding at September 30, 2023 259,532 During the nine months ended September 30, 2023, the Company’s Compensation Committee granted PSUs with three-year performance-based metrics that the Company must meet before those awards may be earned, and the performance period for those grants ends on December 31, 2025. The Compensation Committee will determine the achievement of performance results and corresponding vesting of PSUs for each performance period. The weighted average grant-date fair value per share for the common shares underlying all PSUs granted during the nine-month period ended September 30, 2023 was $133.83. Deferred Share Units A summary of activity related to deferred share units (“DSUs”) during the nine-month period ended September 30, 2023, is presented below: Vested Shares Outstanding at December 31, 2022 26,536 Granted 3,945 Outstanding at September 30, 2023 30,481 The DSUs consist of a combination of DSU grants outstanding under the Progressive Waste share-based compensation plans that were continued by the Company following the Progressive Waste acquisition and DSUs granted by the Company since the Progressive Waste acquisition. The weighted average grant-date fair value per share for the common shares underlying the DSUs granted during the nine-month period ended September 30, 2023 was $136.47. Other Restricted Share Units RSU grants outstanding under the Progressive Waste share-based compensation plans were continued by the Company following the Progressive Waste acquisition and allow for the issuance of shares or cash settlement to employees upon vesting. A summary of activity related to Progressive Waste RSUs during the nine-month period ended September 30, 2023, is presented below: Outstanding at December 31, 2022 57,829 Cash settled (5,803) Outstanding at September 30, 2023 52,026 No RSUs under the Progressive Waste share-based compensation plans were granted subsequent to June 1, 2016. All remaining RSUs were vested as of March 31, 2019. Share-Based Options Share-based options outstanding under the Progressive Waste share-based compensation plans were continued by the Company following the Progressive Waste acquisition and allow for the issuance of shares or cash settlement to employees upon vesting. A summary of activity related to Progressive Waste share-based options during the nine-month period ended September 30, 2023, is presented below: Outstanding at December 31, 2022 43,570 Cash settled (7,787) Outstanding at September 30, 2023 35,783 No share-based options under the Progressive Waste share-based compensation plans were granted subsequent to June 1, 2016. All outstanding share-based options were vested as of December 31, 2017. Employee Share Purchase Plan On May 15, 2020, the Company’s shareholders approved the 2020 Employee Share Purchase Plan (the “ESPP”). Under the ESPP, qualified employees may elect to have payroll deductions withheld from their eligible compensation on each payroll date in amounts equal to or greater than one percent (1%) but not in excess of ten percent (10%) of eligible compensation in order to purchase the Company’s common shares under certain terms and subject to certain restrictions set forth in the ESPP. The exercise price is equal to 95% of the closing price of the Company’s common shares on the last day of the relevant offering period, provided, however, that such exercise price will not be less than 85% of the volume weighted average price of the Company’s common shares as reflected on the Toronto Stock Exchange (the “TSX”) over the final five trading days of such offering period. The maximum number of shares that may be issued under the ESPP is 1,000,000. Under the ESPP, employees purchased 29,808 of the Company’s common shares for $3,908 during the nine months ended September 30, 2023. Under the ESPP, employees purchased 26,582 of the Company’s common shares for $3,271 during the nine months ended September 30, 2022. Normal Course Issuer Bid On July 25, 2023, the Board of Directors of the Company approved, subject to receipt of regulatory approvals, the annual renewal of the Company’s normal course issuer bid (the “NCIB”) to purchase up to 12,881,534 of the Company’s common shares during the period of August 10, 2023 to August 9, 2024 or until such earlier time as the NCIB is completed or terminated at the option of the Company. The renewal followed the conclusion of the Company’s NCIB that expired August 9, 2023. The Company received TSX approval for its annual renewal of the NCIB on August 8, 2023. Under the NCIB, the Company may make share repurchases only in the open market, including on the New York Stock Exchange (the “NYSE”), the TSX, and/or alternative Canadian trading systems, at the prevailing market price at the time of the transaction. In accordance with TSX rules, any daily repurchases made through the TSX and alternative Canadian trading systems is limited to a maximum of 63,103 common shares, which represents 25% of the average daily trading volume on the TSX of 252,412 common shares for the period from February 1, 2023 to July 31, 2023. The TSX rules also allow the Company to purchase, once a week, a block of common shares not owned by any insiders, which may exceed such daily limit. The maximum number of shares that can be purchased per day on the NYSE will be 25% of the average daily trading volume for the four calendar weeks preceding the date of purchase, subject to certain exceptions for block purchases. The timing and amounts of any repurchases pursuant to the NCIB will depend on many factors, including the Company’s capital structure, the market price of the common shares and overall market conditions. All common shares purchased under the NCIB shall be immediately cancelled following their repurchase. For the nine months ended September 30, 2023, the Company did not repurchase any Cash Dividend In November 2022, the Company announced that its Board of Directors increased its regular quarterly cash dividend by $0.025, from $0.23 to $0.255 per Company common share. Cash dividends of $196,815 and $177,710 were paid during the nine months ended September 30, 2023 and 2022, respectively.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
Commitments and Contingencies	Sep. 30, 2023
Commitments and Contingencies [Abstract]
Commitments and Contingencies	18. In the normal course of its business and as a result of the extensive governmental regulation of the solid waste and E&P waste industries, the Company is subject to various judicial and administrative proceedings involving Canadian regulatory authorities as well as U.S. federal, state and local agencies. In these proceedings, an agency may subpoena the Company for records, or seek to impose fines on the Company or revoke or deny renewal of an authorization held by the Company, including an operating permit. From time to time, the Company may also be subject to actions brought by special interest or other groups, adjacent landowners or residents in connection with the permitting and licensing of landfills, transfer stations, and E&P waste treatment, recovery and disposal operations, or alleging environmental damage or violations of the permits and licenses pursuant to which the Company operates. The Company uses $1,000 as a threshold for disclosing environmental matters involving potential monetary sanctions. In addition, the Company is a party to various claims and suits pending for alleged damages to persons and property, alleged violations of certain laws and alleged liabilities arising out of matters occurring during the normal operation of the Company’s business. Except as noted in the matters described below, as of September 30, 2023, there is no current proceeding or litigation involving the Company or its property that the Company believes could have a material adverse effect on its business, financial condition, results of operations or cash flows. Jefferson Parish, Louisiana Landfill Litigation Between June 2016 and December 31, 2020, one of the Company’s subsidiaries, Louisiana Regional Landfill Company (“LRLC”), conducted certain operations at a municipal solid waste landfill known as the Jefferson Parish Landfill (the “JP Landfill”), located in Avondale, Louisiana, near the City of New Orleans. LRLC’s operations were governed by an Operating Agreement entered into in May 2012 by LRLC under its previous name, IESI LA Landfill Corporation, and the owner of the JP Landfill, Jefferson Parish (the “Parish”). The Parish also holds the State of Louisiana permit for the operation of the JP Landfill. Aptim Corporation, and later River Birch, LLC, operated the landfill gas collection system at the JP Landfill under a separate contract with the Parish. In July and August 2018, four separate lawsuits seeking class action status were filed against LRLC and certain other Company subsidiaries, the Parish, and Aptim Corporation in Louisiana state court, and subsequently removed to the United States District Court for the Eastern District of Louisiana, before Judge Susie Morgan in New Orleans. The Court later consolidated the claims of the putative class action plaintiffs. Beginning in December 2018, a series of 11 substantively identical mass actions were filed in Louisiana state court against LRLC and certain other Company subsidiaries, the Parish, and Aptim Corporation. The claims of the mass action plaintiffs were removed to and consolidated in federal court in the Eastern District of Louisiana, also before Judge Susie Morgan (the “Addison” action). The putative class actions and the Addison Addison Addison The Court held an eight-day trial on general causation during January and February 2022. On November 29, 2022, the Court issued a 45-page decision on the general causation trial. The Court concluded that all putative class and mass action plaintiffs established general causation—specifically that emissions and gases from the JP Landfill were capable of causing certain damages alleged by the plaintiffs. The Court held that it only needed to determine the level of exposure necessary to result in injuries and that the level existed somewhere offsite, and that it was not required to delineate this level of exposure within a geographic area. The Court did, however, limit the time period for damages, to between July 2017 and December 2019, and the types of alleged injuries for which the plaintiffs are able to seek damages, to headaches, nausea, vomiting, loss of appetite, sleep disruption, dizziness, fatigue, anxiety and worry, a decrease in quality of life, and loss of enjoyment or use of property. The Addison After the general causation decision, the Court entered a case management order on April 17, 2023 that scheduled a trial of a subset of 8-13 Addison On April 17, 2023, the Company and the other Defendants filed a petition for a writ of mandamus from the Fifth Circuit Court of Appeals challenging the April 17 case management order’s sequencing of a merits trial before class certification. The Fifth Circuit granted the Company’s motion to stay proceedings in the Addison en banc Following the Fifth Circuit’s decision, the District Court and the parties have discussed case management orders for both cases. The Court has ordered the following key deadlines: (i) the Parties will complete briefing of class certification by June 26, 2024; and (ii) the Parties will commence a three-week merits trial on the first 13 Addison The Company has already obtained dismissal of approximately one third of the original Addison Addison Los Angeles County, California Landfill Expansion Litigation A. Chiquita Canyon, LLC Lawsuit Against Los Angeles County In October 2004, the Company’s subsidiary, Chiquita Canyon, LLC (“CCL”), then under prior ownership, filed an application (the “Application”) with the County of Los Angeles (the “County”) Department of Regional Planning (“DRP”) for a conditional use permit (the “CUP”) to authorize the continued operation and expansion of the Chiquita Canyon Landfill (the “CC Landfill”). The CC Landfill has operated since 1972, and as a regional landfill, accepted approximately 2.6 million tons of materials for disposal and beneficial use in 2022. The Application requested expansion of the existing waste footprint on CCL’s contiguous property, an increase in maximum elevation, creation of a new entrance and new support facilities, construction of a facility for the County or another third-party operator to host household hazardous waste collection events, designation of an area for mixed organics/composting, and other modifications. After many years of reviews and delays, upon the recommendation of County staff, the County’s Regional Planning Commission (the “Commission”) approved the Application on April 19, 2017, but imposed operating conditions, fees and exactions that substantially reduced the historical landfill operations and represented a large increase in aggregate taxes and fees. CCL objected to many of the requirements imposed by the Commission. Current estimates for new costs imposed on CCL under the CUP are in excess of $300,000. CCL appealed the Commission’s decision to the County Board of Supervisors, but the appeal was not successful. At a subsequent hearing, on July 25, 2017, the Board of Supervisors approved the CUP. On October 20, 2017, CCL filed in the Superior Court of California, County of Los Angeles a verified petition for writ of mandate and complaint against the County and the County Board of Supervisors captioned Chiquita Canyon, LLC v. County of Los Angeles, No. BS171262 (Los Angeles Co. Super Ct.) (the “Complaint”). The Complaint challenges the terms of the CUP in 13 counts generally alleging that the County violated multiple California and federal statutes and California and federal constitutional protections. CCL seeks the following relief: (a) an injunction and writ of mandate against certain of the CUP’s operational restrictions, taxes and fees, (b) a declaration that the challenged conditions are unconstitutional and in violation of state and federal statutes, (c) reimbursement for any such illegal fees paid under protest, (d) damages, (e) an award of just compensation for a taking, (f) attorney fees, and (g) all other appropriate legal and equitable relief. Following extensive litigation in 2018 and 2019 on the permissible scope of CCL’s challenge, the Superior Court issued its decision on July 2, 2020, granting CCL’s petition for writ of mandate in part and denying it in part. CCL prevailed with respect to 12 of the challenged conditions, many of which imposed new fees and exactions on the CC Landfill. On October 11, 2022, CCL and the County entered into a settlement agreement that requires CCL to file a CUP modification application with the County embodying the terms of the settlement agreement. CCL filed the CUP modification application on November 10, 2022. If the CUP modification application is approved by the County and certain other contingencies are satisfied, CCL will dismiss this lawsuit. However, at this time, the Company is not able to determine the likelihood of any outcome in this matter. B. December 11, 2017 Notice of Violation Regarding Certain CUP Conditions. The County, through its DRP, issued a Notice of Violation, dated December 11, 2017 (the “NOV”), alleging that CCL violated certain conditions of the CUP, including Condition 79(B)(6) of the CUP by failing to pay an $11,600 Bridge & Thoroughfare Fee (“B&T Fee”) that was purportedly due on July 25, 2017. The alleged B&T fee was ostensibly to fund the construction of transportation infrastructure in the area of the Landfill. At the time the NOV was issued, CCL had already contested the legality of the B&T fee in the October 20, 2017 Complaint filed against the County in Los Angeles County Superior Court, described above under paragraph A (the “CUP lawsuit”). On January 12, 2018, CCL filed an appeal of the alleged violations in the NOV. Subsequently, CCL filed additional legal arguments and exhibits contesting the NOV. On March 6, 2018, a DRP employee designated as hearing officer sustained the NOV, including the $11,600 B&T fee, and imposed an administrative penalty in the amount of $83 and a noncompliance fee of $0.75. A written decision memorializing the hearing officer’s findings and order was issued on July 10, 2018. On April 13, 2018, CCL filed in the Superior Court of California, County of Los Angeles a Petition for Writ of Administrative Mandamus against the County seeking to overturn the decision sustaining the NOV, contending that the NOV and decision are not supported by the facts or law. On July 17, 2018, the Court granted CCL leave to pay the $11,600 B&T fee and to amend its Complaint in the CUP lawsuit to reflect the payment under protest, allowing the challenge to the B&T fee under the Mitigation Fee Act to proceed in the CUP lawsuit. CCL paid the B&T fee under protest on August 10, 2018, and also paid on that date the administrative penalty of $83 and the noncompliance fee of $0.75. The Court indicated that the NOV case would be coordinated with the CUP lawsuit. On October 11, 2022, CCL and the County entered into the settlement agreement, described above under paragraph A. If the CUP modification application is approved by the County and certain other contingencies are satisfied, CCL will dismiss this lawsuit. However, at this time, the Company is not able to determine the likelihood of any outcome in this matter.

Subsequent Events

Subsequent Events	9 Months Ended
Subsequent Events	Sep. 30, 2023
Subsequent Events [Abstract]
Subsequent Events	19 . SUBSEQUENT EVENT On October 25, 2023, the Company announced that its Board of Directors increased its regular quarter cash dividend by $0.03, from $0.255 to $0.285 per Company common share, and then declared a regular quarterly cash dividend of $0.285 per Company common share. The dividend will be paid on November 28, 2023, to shareholders of record on the close of business on November 8, 2023.

Leases (Policy)

Leases (Policy)	9 Months Ended
Leases (Policy)	Sep. 30, 2023
Lessee Disclosure [Abstract]
Leases	The Company rents certain equipment and facilities under short-term agreements, non-cancelable operating lease agreements and finance leases. The Company determines if an arrangement is or contains a lease at contract inception. The Company recognizes a right-of-use (“ROU”) asset and a lease liability at the lease commencement date. The lease liability is initially measured at the present value of the unpaid lease payments at the lease commencement date. Key estimates and judgments include how the Company determines (1) the discount rate it uses to discount the unpaid lease payments to present value, (2) lease term and (3) lease payments. The lease guidance requires a lessee to discount its unpaid lease payments using the interest rate implicit in the lease or, if that rate cannot be readily determined, its incremental borrowing rate. Generally, the Company cannot determine the interest rate implicit in the lease because it does not have access to the lessor’s estimated residual value or the amount of the lessor’s deferred initial direct costs. Therefore, the Company generally uses its incremental borrowing rate as the discount rate for the lease. The Company’s incremental borrowing rate for a lease is the rate of interest it would have to pay on a collateralized basis to borrow an amount equal to the lease payments under similar terms. The lease term for the Company’s leases includes the noncancelable period of the lease, plus any additional periods covered by either a Company option to extend (or not to terminate) the lease that the Company is reasonably certain to exercise, or an option to extend (or not to terminate) the lease controlled by the lessor. Lease payments included in the measurement of the lease liability comprise fixed payments or variable lease payments. The variable lease payments take into account annual changes in the consumer price index and common area maintenance charges, if known. ROU assets for operating and finance leases are periodically reviewed for impairment losses. The Company uses the long-lived asset impairment guidance in ASC Subtopic 360-10, Property, Plant, and Equipment – Overall, to determine whether an ROU asset is impaired, and if so, the amount of the impairment loss to recognize. The Company did not recognize an impairment charge for any of its ROU assets during the nine months ended September 30, 2023 and 2022. The Company monitors for events or changes in circumstances that require a reassessment of one of its leases. When a reassessment results in the remeasurement of a lease liability, a corresponding adjustment is made to the carrying amount of the corresponding ROU asset. The Company did not recognize any significant remeasurements during the nine months ended September 30, 2023 and 2022. The Company has elected not to recognize ROU assets and lease liabilities for short-term leases that have a lease term of 12 months or less. The Company has elected to apply the short-term lease recognition and measurement exemption allowed for in the lease accounting standard. The Company recognizes the lease payments associated with its short-term leases as an expense on a straight-line basis over the lease term.

Revenue (Tables)

Revenue (Tables)	9 Months Ended
Revenue (Tables)	Sep. 30, 2023
Revenue [Abstract]
Total Reported Revenues by Service Line	Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Commercial $ 630,641 $ 564,592 $ 1,848,723 $ 1,602,793 Residential 538,364 487,995 1,582,289 1,391,603 Industrial and construction roll off 343,740 315,904 1,002,085 870,949 Total collection 1,512,745 1,368,491 4,433,097 3,865,345 Landfill 390,330 345,215 1,116,707 984,700 Transfer 313,214 271,685 892,757 751,117 Recycling 36,103 48,246 105,724 178,845 E&P 62,066 56,995 172,431 154,706 Intermodal and other 44,984 47,604 122,655 139,605 Intercompany (294,698) (258,368) (857,029) (731,760) Total $ 2,064,744 $ 1,879,868 $ 5,986,342 $ 5,342,558

Accounts Receivable (Tables)

Accounts Receivable (Tables)	9 Months Ended
Accounts Receivable (Tables)	Sep. 30, 2023
Accounts Receivable [Abstract]
Allowance for Credit Loss	Nine Months Ended September 30, 2023 2022 Beginning balance $ 22,939 $ 18,480 Current period provision for expected credit losses 13,363 11,097 Write-offs charged against the allowance (17,049) (12,866) Recoveries collected 4,711 3,912 Impact of changes in foreign currency 6 (111) Ending balance $ 23,970 $ 20,512

Landfill Accounting (Tables)

Landfill Accounting (Tables)	9 Months Ended
Landfill Accounting (Tables)	Sep. 30, 2023
Landfill Accounting [Abstract]
Reconciliation of Final Capping, Closure and Post-Closure Liability Balance	The following is a reconciliation of the Company’s final capping, closure and post-closure liability balance from December 31, 2022 to September 30, 2023: Final capping, closure and post-closure liability at December 31, 2022 $ 344,606 Liability adjustments 25,542 Accretion expense associated with landfill obligations 13,554 Closure payments (14,864) Assumption of closure liabilities from acquisitions 7,687 Foreign currency translation adjustment 56 Final capping, closure and post-closure liability at September 30, 2023 $ 376,581

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
Acquisitions (Tables)	Sep. 30, 2023
Acquisitions [Abstract]
Summary of Consideration Transferred to Acquire Businesses and Amounts of Identifiable Assets Acquired, Liabilities Assumed and Noncontrolling Interests	2023 2022 Acquisitions Acquisitions Fair value of consideration transferred: Cash $ 573,185 $ 1,272,910 Debt assumed 73,397 96,814 646,582 1,369,724 Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired: Accounts receivable 15,412 32,329 Prepaid expenses and other current assets 4,474 6,549 Restricted investments 5,462 — Operating lease right-of-use assets 14,048 3,160 Property and equipment 186,130 617,267 Long-term franchise agreements and contracts 59,509 109,364 Customer lists 5,020 69,378 Permits and other intangibles 2,403 97,548 Other assets 24 — Accounts payable and accrued liabilities (11,005) (34,905) Current portion of operating lease liabilities (366) (1,100) Deferred revenue (1,333) (7,766) Contingent consideration (13,350) (6,543) Long-term portion of operating lease liabilities (13,682) (2,060) Other long-term liabilities (10,439) (3,498) Deferred income taxes (3,501) (26,440) Total identifiable net assets 238,806 853,283 Goodwill $ 407,776 $ 516,441

Intangible Assets, Net (Tables)

Intangible Assets, Net (Tables)	9 Months Ended
Intangible Assets, Net (Tables)	Sep. 30, 2023
Intangible Assets, Net [Abstract]
Intangible Assets Exclusive of Goodwill	Intangible assets, exclusive of goodwill, consisted of the following at September 30, 2023: Gross Accumulated Net Carrying Accumulated Impairment Carrying Amount Amortization Loss Amount Finite-lived intangible assets: Long-term franchise agreements and contracts $ 963,690 $ (338,262) $ — $ 625,428 Customer lists 780,712 (577,744) — 202,968 Permits and other 782,252 (132,785) (40,784) 608,683 2,526,654 (1,048,791) (40,784) 1,437,079 Indefinite-lived intangible assets: Solid waste collection and transportation permits 181,613 — — 181,613 Intangible assets, exclusive of goodwill $ 2,708,267 $ (1,048,791) $ (40,784) $ 1,618,692 Intangible assets, exclusive of goodwill, consisted of the following at December 31, 2022: Gross Accumulated Net Carrying Accumulated Impairment Carrying Amount Amortization Loss Amount Finite-lived intangible assets: Long-term franchise agreements and contracts $ 916,582 $ (297,382) $ — $ 619,200 Customer lists 776,719 (527,425) — 249,294 Permits and other 779,689 (115,095) (40,784) 623,810 2,472,990 (939,902) (40,784) 1,492,304 Indefinite-lived intangible assets: Solid waste collection and transportation permits 181,613 — — 181,613 Intangible assets, exclusive of goodwill $ 2,654,603 $ (939,902) $ (40,784) $ 1,673,917
Estimated Future Amortization Expense of Amortizable Intangible Assets	Estimated future amortization expense for the next five years relating to finite-lived intangible assets owned as of September 30, 2023 is as follows: For the year ending December 31, 2023 $ 157,219 For the year ending December 31, 2024 $ 139,959 For the year ending December 31, 2025 $ 123,027 For the year ending December 31, 2026 $ 107,340 For the year ending December 31, 2027 $ 93,670

Leases (Tables)

Leases (Tables)	9 Months Ended
Leases (Tables)	Sep. 30, 2023
Lessee Disclosure [Abstract]
Summary of lease cost for operating and finance leases	Lease cost for operating and finance leases for the three and nine months ended September 30, 2023 and 2022 were as follows: Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Operating lease cost $ 11,914 $ 9,822 $ 34,881 $ 30,814 Finance lease cost: Amortization of leased assets 733 682 2,098 1,802 Interest on leased liabilities 63 61 168 161 Total lease cost $ 12,710 $ 10,565 $ 37,147 $ 32,777 Supplemental cash flow information and non-cash activity related to the Company’s leases are as follows: Nine Months Ended September 30, 2023 2022 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 33,967 $ 30,313 Operating cash flows from finance leases $ 168 $ 161 Financing cash flows from finance leases $ 2,079 $ 1,758 Non-cash activity: Right-of-use assets obtained in exchange for lease liabilities - operating leases $ 85,377 $ 53,967 Right-of-use assets obtained in exchange for lease liabilities - finance leases $ 1,388 $ 3,369 Weighted-average remaining lease term and discount rate for the Company’s leases are as follows: Nine Months Ended September 30, 2023 2022 Weighted average remaining lease term - operating leases 11.1 years 8.9 years Weighted average remaining lease term - finance leases 3.9 years 4.4 years Weighted average discount rate - operating leases 3.92 % 2.96 % Weighted average discount rate - finance leases 2.35 % 1.96 %
Summary of future minimum lease payments, operating leases	As of September 30, 2023, future minimum lease payments, reconciled to the respective lease liabilities, are as follows: Operating Leases Finance Leases Last 3 months of 2023 $ 11,634 $ 798 2024 40,695 3,194 2025 34,940 3,194 2026 32,313 2,608 2027 31,270 1,186 Thereafter 198,782 293 Minimum lease payments 349,634 11,273 Less: imputed interest (77,189) (501) Present value of minimum lease payments 272,445 10,772 Less: current portion of lease liabilities (32,677) (2,962) Long-term portion of lease liabilities $ 239,768 $ 7,810
Summary of future minimum lease payments, finance leases	As of September 30, 2023, future minimum lease payments, reconciled to the respective lease liabilities, are as follows: Operating Leases Finance Leases Last 3 months of 2023 $ 11,634 $ 798 2024 40,695 3,194 2025 34,940 3,194 2026 32,313 2,608 2027 31,270 1,186 Thereafter 198,782 293 Minimum lease payments 349,634 11,273 Less: imputed interest (77,189) (501) Present value of minimum lease payments 272,445 10,772 Less: current portion of lease liabilities (32,677) (2,962) Long-term portion of lease liabilities $ 239,768 $ 7,810

Long-Term Debt (Tables)

Long-Term Debt (Tables)	9 Months Ended
Long-Term Debt (Tables)	Sep. 30, 2023
Long-Term Debt [Abstract]
Long-Term Debt	The following table presents the Company’s long-term debt at September 30, 2023 and December 31, 2022: September 30, December 31, 2023 2022 Revolver under Credit Agreement, bearing interest ranging from 6.38% to 8.50% (a) $ 531,618 $ 614,705 Term loan under Credit Agreement, bearing interest at 6.43% (a) 650,000 650,000 Term loan under Term Loan Agreement, bearing interest at 6.43% (a) 800,000 800,000 4.25% Senior Notes due 2028 500,000 500,000 3.50% Senior Notes due 2029 500,000 500,000 2.60% Senior Notes due 2030 600,000 600,000 2.20% Senior Notes due 2032 650,000 650,000 3.20% Senior Notes due 2032 500,000 500,000 4.20% Senior Notes due 2033 750,000 750,000 3.05% Senior Notes due 2050 500,000 500,000 2.95% Senior Notes due 2052 850,000 850,000 Notes payable to sellers and other third parties, bearing interest ranging from 2.42% to 10.35%, principal and interest payments due periodically with due dates ranging from 2024 to 2036 (a) 56,047 37,232 Finance leases, bearing interest ranging from 1.89% to 5.07%, with lease expiration dates ranging from 2026 to 2029 (a) 10,772 11,464 6,898,437 6,963,401 Less – current portion (32,760) (6,759) Less – unamortized debt discount and issuance costs (62,238) (66,493) Long-term portion of debt and notes payable $ 6,803,439 $ 6,890,149 ____________________ (a) Interest rates represent the interest rates at September 30, 2023.
Details of the Company's Credit Agreement	Details of the Credit Agreement are as follows: September 30, December 31, 2023 2022 Revolver under Credit Agreement Available $ 1,278,859 $ 1,193,502 Letters of credit outstanding $ 39,523 $ 41,793 Total amount drawn, as follows: $ 531,618 $ 614,705 Amount drawn – U.S. Term SOFR rate loan $ 335,000 $ 391,000 Interest rate applicable – U.S. Term SOFR rate loan 6.43 % 5.42 % Amount drawn – U.S. Term SOFR rate loan $ 30,000 $ — Interest rate applicable – U.S. Term SOFR rate loan 6.42 % — % Amount drawn – U.S. base rate loan $ 15,000 $ — Interest rate applicable – U.S. base rate loan 8.50 % — % Amount drawn – Canadian prime rate loan $ 11,094 $ — Interest rate applicable - Canadian prime rate loan 7.20 % — % Amount drawn – Canadian bankers’ acceptance $ 85,054 $ 223,705 Interest rate applicable – Canadian bankers’ acceptance 6.38 % 5.74 % Amount drawn – Canadian bankers’ acceptance $ 55,470 $ — Interest rate applicable – Canadian bankers’ acceptance 6.38 % — % Commitment – rate applicable 0.09 % 0.09 % Term loan under Credit Agreement Amount drawn – U.S. Term SOFR rate loan $ 650,000 $ 650,000 Interest rate applicable – U.S. Term SOFR rate loan 6.43 % 5.42 %

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
Segment Reporting (Tables)	Sep. 30, 2023
Segment Reporting [Abstract]
Summary of Financial Information Concerning Company's Reportable Segments	Summarized financial information concerning the Company’s reportable segments for the three and nine months ended September 30, 2023 and 2022, is shown in the following tables: Three Months Ended Intercompany Reported Segment September 30, 2023 Revenue Revenue (b) Revenue EBITDA (c) Southern $ 465,134 $ (51,556) $ 413,578 $ 133,072 Western 486,351 (53,889) 432,462 124,433 Central 419,169 (46,307) 372,862 137,823 Eastern 420,855 (67,746) 353,109 100,779 Canada 292,351 (29,256) 263,095 108,524 MidSouth 275,582 (45,944) 229,638 61,923 Corporate (a) — — — (2,729) $ 2,359,442 $ (294,698) $ 2,064,744 $ 663,825 Three Months Ended Intercompany Reported Segment September 30, 2022 Revenue Revenue (b) Revenue EBITDA (c) Southern $ 429,787 $ (46,350) $ 383,437 $ 122,472 Western 412,928 (42,739) 370,189 109,736 Central 380,756 (41,867) 338,889 122,471 Eastern 385,204 (55,946) 329,258 77,384 Canada 270,041 (27,727) 242,314 87,910 MidSouth 259,520 (43,739) 215,781 64,036 Corporate (a) — — — (11,657) $ 2,138,236 $ (258,368) $ 1,879,868 $ 572,352 Nine Months Ended Intercompany Reported Segment September 30, 2023 Revenue Revenue (b) Revenue EBITDA (c) Southern $ 1,382,681 $ (155,149) $ 1,227,532 $ 384,660 Western 1,402,628 (155,355) 1,247,273 354,682 Central 1,218,670 (136,638) 1,082,032 384,538 Eastern 1,215,266 (189,604) 1,025,662 260,569 Canada 824,303 (85,347) 738,956 286,703 MidSouth 799,823 (134,936) 664,887 182,072 Corporate (a) — — — (22,142) $ 6,843,371 $ (857,029) $ 5,986,342 $ 1,831,082 Nine Months Ended Intercompany Reported Segment September 30, 2022 Revenue Revenue (b) Revenue EBITDA (c) Southern $ 1,232,302 $ (129,003) $ 1,103,299 $ 341,006 Western 1,179,592 (129,159) 1,050,433 315,114 Central 1,067,991 (113,854) 954,137 333,866 Eastern 1,064,236 (154,322) 909,914 214,335 Canada 789,531 (82,127) 707,404 265,402 MidSouth 740,666 (123,295) 617,371 175,133 Corporate (a) — — — (19,042) $ 6,074,318 $ (731,760) $ 5,342,558 $ 1,625,814 ____________________ (a) The majority of Corporate expenses are allocated to the six operating segments. Direct acquisition expenses, expenses associated with common shares held in the deferred compensation plan exchanged for other investment options and share-based compensation expenses associated with Progressive Waste share-based grants outstanding at June 1, 2016 that were continued by the Company are not allocated to the six operating segments and comprise the net EBITDA of the Company’s Corporate segment for the periods presented. (b) Intercompany revenues reflect each segment’s total intercompany sales, including intercompany sales within a segment and between segments. Transactions within and between segments are made on a basis intended to reflect the market value of the service. (c) For those items included in the determination of segment EBITDA, the accounting policies of the segments are the same as those described in the Company’s most recent Annual Report on Form 10-K.
Changes in Goodwill by Reportable Segment	The following tables show changes in goodwill during the nine months ended September 30, 2023 and 2022, by reportable segment: Southern Western Central Eastern Canada MidSouth Total Balance as of December 31, 2022 $ 1,547,894 $ 732,335 $ 1,003,470 $ 1,189,111 $ 1,684,670 $ 744,817 $ 6,902,297 Goodwill acquired — 45,072 3,605 361,398 — 1,366 411,441 Goodwill acquisition adjustments (1,450) — — — (2,215) — (3,665) Impact of changes in foreign currency — — — — 3,011 — 3,011 Balance as of September 30, 2023 $ 1,546,444 $ 777,407 $ 1,007,075 $ 1,550,509 $ 1,685,466 $ 746,183 $ 7,313,084 Southern Western Central Eastern Canada MidSouth Total Balance as of December 31, 2021 $ 1,457,437 $ 503,223 $ 931,269 $ 992,578 $ 1,559,512 $ 743,624 $ 6,187,643 Goodwill acquired 85,004 — 73,787 181,671 167,926 — 508,388 Goodwill acquisition adjustments — 8,060 — — — (7) 8,053 Impact of changes in foreign currency — — — — (129,224) — (129,224) Balance as of September 30, 2022 $ 1,542,441 $ 511,283 $ 1,005,056 $ 1,174,249 $ 1,598,214 $ 743,617 $ 6,574,860
Total Assets for Reportable Segments	Total assets for each of the Company’s reportable segments at September 30, 2023 and December 31, 2022, were as follows: September 30, December 31, 2023 2022 Southern $ 3,478,012 $ 3,410,888 Western 3,409,663 3,239,679 Central 2,801,263 2,803,853 Eastern 3,156,943 2,752,436 Canada 2,734,397 2,773,882 MidSouth 1,705,300 1,727,323 Corporate 445,662 426,542 Total Assets $ 17,731,240 $ 17,134,603
Reconciliation of Primary Measure of Segment Profitability to Income Before Income Tax Provision	A reconciliation of the Company’s primary measure of segment profitability (segment EBITDA) to Income before income tax provision in the Condensed Consolidated Statements of Net Income is as follows: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Southern segment EBITDA $ 133,072 $ 122,472 $ 384,660 $ 341,006 Western segment EBITDA 124,433 109,736 354,682 315,114 Central segment EBITDA 137,823 122,471 384,538 333,866 Eastern segment EBITDA 100,779 77,384 260,569 214,335 Canada segment EBITDA 108,524 87,910 286,703 265,402 MidSouth segment EBITDA 61,923 64,036 182,072 175,133 Subtotal reportable segments 666,554 584,009 1,853,224 1,644,856 Unallocated corporate overhead (2,729) (11,657) (22,142) (19,042) Depreciation (214,966) (193,287) (632,347) (562,174) Amortization of intangibles (39,405) (38,859) (117,740) (113,956) Impairments and other operating items (56,477) (13,438) (69,201) (19,467) Interest expense (69,016) (51,161) (204,914) (137,565) Interest income 2,833 1,784 6,886 2,574 Other income, net 5,372 8,487 8,346 2,373 Income before income tax provision $ 292,166 $ 285,878 $ 822,112 $ 797,599

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
Derivative Financial Instruments (Tables)	Sep. 30, 2023
Fair Value of Derivative Instrument Designated as Cash Flow Hedges	The fair values of derivative instruments designated as cash flow hedges at September 30, 2023, were as follows: Derivatives Designated as Cash Asset Derivatives Liability Derivatives Flow Hedges Balance Sheet Location Fair Value Balance Sheet Location Fair Value Interest rate swaps Prepaid expenses and other current assets (a) $ 21,166 Accrued liabilities $ — Other assets, net 17,499 Total derivatives designated as cash flow hedges $ 38,665 $ — ____________________ (a) Represents the estimated amount of the existing unrealized gains on interest rate swaps at September 30, 2023 (based on the interest rate yield curve at that date), included in AOCIL expected to be reclassified into pre-tax earnings within the next 12 months. The actual amounts reclassified into earnings are dependent on future movements in interest rates. The fair values of derivative instruments designated as cash flow hedges at December 31, 2022, were as follows: Derivatives Designated as Cash Asset Derivatives Liability Derivatives Flow Hedges Balance Sheet Location Fair Value Balance Sheet Location Fair Value Interest rate swaps Prepaid expenses and other current assets $ 17,906 Accrued liabilities $ — Other assets, net 13,901 Total derivatives designated as cash flow hedges $ 31,807 $ —
Impact of Cash Flow Hedges on Results of Operations, Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss)	The following table summarizes the impact of the Company’s cash flow hedges on the results of operations, comprehensive income (loss) and AOCIL for the three and nine months ended September 30, 2023 and 2022: Derivatives Statement of Amount of (Gain) or Loss Reclassified Designated as Cash Amount of Gain or (Loss) Recognized Net Income from AOCIL into Earnings, Flow Hedges as AOCIL on Derivatives, Net of Tax (a) Classification Net of Tax (b) Three Months Ended Three Months Ended September 30, September 30, 2023 2022 2023 2022 Interest rate swaps $ 5,724 $ 20,344 Interest expense $ (3,885) $ 697 Derivatives Statement of Amount of (Gain) or Loss Reclassified Designated as Cash Amount of Gain or (Loss) Recognized Net Income from AOCIL into Earnings, Flow Hedges as AOCIL on Derivatives, Net of Tax (a) Classification Net of Tax (b) Nine Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Interest rate swaps $ 15,419 $ 55,102 Interest expense $ (10,378) $ 6,868 ____________________ (a) In accordance with the derivatives and hedging guidance, the changes in fair values of interest rate swaps have been recorded in equity as a component of AOCIL. As the critical terms of the interest rate swaps match the underlying debt being hedged, all unrealized changes in fair value are recorded in AOCIL. (b) Amounts reclassified from AOCIL into earnings related to realized gains and losses on interest rate swaps are recognized when interest payments or receipts occur related to the swap contracts, which correspond to when interest payments are made on the Company’s hedged debt.
Interest Rate Swap
Company's Derivative Instruments	At September 30, 2023, the Company’s derivative instruments included four interest rate swap agreements as follows: Fixed Variable Notional Interest Interest Rate Date Entered Amount Rate Paid (a) Received Effective Date (b) Expiration Date August 2017 $ 200,000 2.1230 % 1-month Term SOFR November 2022 October 2025 June 2018 $ 200,000 2.8480 % 1-month Term SOFR November 2022 October 2025 June 2018 $ 200,000 2.8284 % 1-month Term SOFR November 2022 October 2025 December 2018 $ 200,000 2.7715 % 1-month Term SOFR November 2022 July 2027 ____________________ (a) Plus applicable margin. (b) In October 2022, the Company amended the reference rate in all of its outstanding interest rate swap contracts to replace One-Month LIBOR with One-Month Term SOFR and certain credit spread adjustments. The Company did not record any gains or losses upon the conversion of the reference rates in these interest rate swap contracts, and the Company believes these amendments will not have a material impact on its Condensed Consolidated Financial Statements.

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	9 Months Ended
Fair Value of Financial Instruments (Tables)	Sep. 30, 2023
Fair Value [Abstract]
Carrying Values and Fair Values of Debt Instruments	Carrying Value at Fair Value (a) at September 30, December 31, September 30, December 31, 2023 2022 2023 2022 4.25% Senior Notes due 2028 $ 500,000 $ 500,000 $ 472,450 $ 470,850 3.50% Senior Notes due 2029 $ 500,000 $ 500,000 $ 453,600 $ 457,650 2.60% Senior Notes due 2030 $ 600,000 $ 600,000 $ 504,060 $ 510,540 2.20% Senior Notes due 2032 $ 650,000 $ 650,000 $ 500,045 $ 514,540 3.20% Senior Notes due 2032 $ 500,000 $ 500,000 $ 414,250 $ 429,000 4.20% Senior Notes due 2033 $ 750,000 $ 750,000 $ 668,475 $ 699,450 3.05% Senior Notes due 2050 $ 500,000 $ 500,000 $ 316,250 $ 343,300 2.95% Senior Notes due 2052 $ 850,000 $ 850,000 $ 516,035 $ 561,425 ____________________ (a) Senior Notes are classified as Level 2 within the fair value hierarchy. Fair value inputs include third-party calculations of the market interest rate of notes with similar ratings in similar industries over the remaining note terms.

Net Income Per Share Informat_2

Net Income Per Share Information (Tables)	9 Months Ended
Net Income Per Share Information (Tables)	Sep. 30, 2023
Net Income Per Share Information [Abstract]
Basic and Diluted Net Income Per Common Share	The following table sets forth the calculation of the numerator and denominator used in the computation of basic and diluted net income per common share attributable to the Company’s shareholders for the three and nine months ended September 30, 2023 and 2022: Three Months Ended Nine Months Ended September 30, September 30, 2023 2022 2023 2022 Numerator: Net income attributable to Waste Connections for basic and diluted earnings per share $ 229,026 $ 236,912 $ 636,047 $ 641,310 Denominator: Basic shares outstanding 257,633,703 257,197,010 257,535,408 257,438,756 Dilutive effect of equity-based awards 595,701 694,625 575,076 621,995 Diluted shares outstanding 258,229,404 257,891,635 258,110,484 258,060,751

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
Fair Value Measurements (Tables)	Sep. 30, 2023
Fair Value [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring Basis	The Company’s assets and liabilities measured at fair value on a recurring basis at September 30, 2023 and December 31, 2022, were as follows: Fair Value Measurement at September 30, 2023 Using Quoted Prices in Significant Active Markets Other Significant for Identical Observable Unobservable Assets Inputs Inputs Total (Level 1) (Level 2) (Level 3) Interest rate swap derivative instruments – net asset position $ 38,665 $ — $ 38,665 $ — Restricted cash $ 102,844 $ 102,844 $ — $ — Restricted investments $ 75,618 $ — $ 75,618 $ — Contingent consideration $ (122,008) $ — $ — $ (122,008) Fair Value Measurement at December 31, 2022 Using Quoted Prices in Significant Active Markets Other Significant for Identical Observable Unobservable Assets Inputs Inputs Total (Level 1) (Level 2) (Level 3) Interest rate swap derivative instruments – net asset position $ 31,807 $ — $ 31,807 $ — Restricted cash $ 102,727 $ 102,727 $ — $ — Restricted investments $ 66,402 $ — $ 66,402 $ — Contingent consideration $ (81,415) $ — $ — $ (81,415)
Fair Value for Level 3 Liabilities	The following table summarizes the changes in the fair value for Level 3 liabilities related to contingent consideration for the nine months ended September 30, 2023 and 2022: Nine Months Ended September 30, 2023 2022 Beginning balance $ 81,415 $ 94,308 Contingent consideration recorded at acquisition date 13,350 6,543 Payment of contingent consideration recorded at acquisition date (4,255) (12,114) Payment of contingent consideration recorded in earnings — (2,982) Adjustments to contingent consideration 30,367 (1,030) Interest accretion expense 1,131 1,073 Foreign currency translation adjustment — (35) Ending balance $ 122,008 $ 85,763

Other Comprehensive Income (L_2

Other Comprehensive Income (Loss) (Tables)	9 Months Ended
Other Comprehensive Income (Loss) (Tables)	Sep. 30, 2023
Other Comprehensive Income (Loss) [Abstract]
Components of Other Comprehensive Income (Loss)	Three Months Ended September 30, 2023 Gross Tax Effect Net of Tax Interest rate swap amounts reclassified into interest expense $ (5,286) $ 1,401 $ (3,885) Changes in fair value of interest rate swaps 7,788 (2,064) 5,724 Foreign currency translation adjustment (50,020) — (50,020) $ (47,518) $ (663) $ (48,181) Three Months Ended September 30, 2022 Gross Tax Effect Net of Tax Interest rate swap amounts reclassified into interest expense $ 948 $ (251) $ 697 Changes in fair value of interest rate swaps 27,679 (7,335) 20,344 Foreign currency translation adjustment (145,955) — (145,955) $ (117,328) $ (7,586) $ (124,914) Nine Months Ended September 30, 2023 Gross Tax Effect Net of Tax Interest rate swap amounts reclassified into interest expense $ (14,120) $ 3,742 $ (10,378) Changes in fair value of interest rate swaps 20,979 (5,560) 15,419 Foreign currency translation adjustment 2,527 — 2,527 $ 9,386 $ (1,818) $ 7,568 Nine Months Ended September 30, 2022 Gross Tax Effect Net of Tax Interest rate swap amounts reclassified into interest expense $ 9,344 $ (2,476) $ 6,868 Changes in fair value of interest rate swaps 74,969 (19,867) 55,102 Foreign currency translation adjustment (185,030) — (185,030) $ (100,717) $ (22,343) $ (123,060)
Amounts Included in Accumulated Other Comprehensive Income (Loss)	A rollforward of the amounts included in AOCIL, net of taxes, for the nine months ended September 30, 2023 and 2022, is as follows: Foreign Accumulated Currency Other Interest Translation Comprehensive Rate Swaps Adjustment Income (Loss) Balance at December 31, 2022 $ 23,378 $ (80,208) $ (56,830) Amounts reclassified into earnings (10,378) — (10,378) Changes in fair value 15,419 — 15,419 Foreign currency translation adjustment — 2,527 2,527 Balance at September 30, 2023 $ 28,419 $ (77,681) $ (49,262) Foreign Accumulated Currency Other Interest Translation Comprehensive Rate Swaps Adjustment Income (Loss) Balance at December 31, 2021 $ (37,544) $ 77,128 $ 39,584 Amounts reclassified into earnings 6,868 — 6,868 Changes in fair value 55,102 — 55,102 Foreign currency translation adjustment — (185,030) (185,030) Balance at September 30, 2022 $ 24,426 $ (107,902) $ (83,476)

Shareholders' Equity (Tables)

Shareholders' Equity (Tables)	9 Months Ended
Shareholders' Equity (Tables)	Sep. 30, 2023
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Activity Related to Restricted Share Units	A summary of activity related to restricted share units (“RSUs”) during the nine-month period ended September 30, 2023, is presented below: Unvested Shares Outstanding at December 31, 2022 955,999 Granted 414,309 Forfeited (45,090) Vested and issued (370,766) Outstanding at September 30, 2023 954,452
Summary of Activity Related to Restricted Share Units	A summary of activity related to restricted share units (“RSUs”) during the nine-month period ended September 30, 2023, is presented below: Unvested Shares Outstanding at December 31, 2022 955,999 Granted 414,309 Forfeited (45,090) Vested and issued (370,766) Outstanding at September 30, 2023 954,452
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Performance-Based Restricted Share Units Activity and Related Information	A summary of activity related to performance-based restricted share units (“PSUs”) during the nine-month period ended September 30, 2023, is presented below: Unvested Shares Outstanding at December 31, 2022 341,850 Granted 113,347 Vested and issued (195,665) Outstanding at September 30, 2023 259,532
Summary of Performance-Based Restricted Share Units Activity and Related Information	A summary of activity related to performance-based restricted share units (“PSUs”) during the nine-month period ended September 30, 2023, is presented below: Unvested Shares Outstanding at December 31, 2022 341,850 Granted 113,347 Vested and issued (195,665) Outstanding at September 30, 2023 259,532
Deferred Share Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Activity Related to Restricted Share Units	A summary of activity related to deferred share units (“DSUs”) during the nine-month period ended September 30, 2023, is presented below: Vested Shares Outstanding at December 31, 2022 26,536 Granted 3,945 Outstanding at September 30, 2023 30,481
Summary of Activity Related to Restricted Share Units	A summary of activity related to deferred share units (“DSUs”) during the nine-month period ended September 30, 2023, is presented below: Vested Shares Outstanding at December 31, 2022 26,536 Granted 3,945 Outstanding at September 30, 2023 30,481
Progressive Waste Solutions Ltd.
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Stock Option Activity and Related Information	Outstanding at December 31, 2022 43,570 Cash settled (7,787) Outstanding at September 30, 2023 35,783
Summary of Stock Option Activity and Related Information	Outstanding at December 31, 2022 43,570 Cash settled (7,787) Outstanding at September 30, 2023 35,783
Progressive Waste Solutions Ltd. \| Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Summary of Activity Related to Restricted Share Units	Outstanding at December 31, 2022 57,829 Cash settled (5,803) Outstanding at September 30, 2023 52,026
Summary of Activity Related to Restricted Share Units	Outstanding at December 31, 2022 57,829 Cash settled (5,803) Outstanding at September 30, 2023 52,026

Revenue - Revenues by Service L

Revenue - Revenues by Service Line (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue from External Customer [Line Items]
Revenues	$ 2,064,744	$ 1,879,868	$ 5,986,342	$ 5,342,558
Reportable Segments \| Commercial \| Collection
Revenue from External Customer [Line Items]
Revenues	630,641	564,592	1,848,723	1,602,793
Reportable Segments \| Residential \| Collection
Revenue from External Customer [Line Items]
Revenues	538,364	487,995	1,582,289	1,391,603
Reportable Segments \| Industrial and construction roll off \| Collection
Revenue from External Customer [Line Items]
Revenues	343,740	315,904	1,002,085	870,949
Reportable Segments \| Collection
Revenue from External Customer [Line Items]
Revenues	1,512,745	1,368,491	4,433,097	3,865,345
Reportable Segments \| Landfill
Revenue from External Customer [Line Items]
Revenues	390,330	345,215	1,116,707	984,700
Reportable Segments \| Transfer
Revenue from External Customer [Line Items]
Revenues	313,214	271,685	892,757	751,117
Reportable Segments \| Recycling
Revenue from External Customer [Line Items]
Revenues	36,103	48,246	105,724	178,845
Reportable Segments \| Exploration and Production Waste Treatment Recovery and Disposal
Revenue from External Customer [Line Items]
Revenues	62,066	56,995	172,431	154,706
Reportable Segments \| Intermodal and other
Revenue from External Customer [Line Items]
Revenues	44,984	47,604	122,655	139,605
Intercompany Revenue
Revenue from External Customer [Line Items]
Revenues	$ (294,698)	$ (258,368)	$ (857,029)	$ (731,760)

Revenue - Contract Acquisition

Revenue - Contract Acquisition Costs (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Capitalized contract costs	$ 26,518	$ 23,818
Minimum
Estimated life of relevant customer relationship	1 year
Maximum
Estimated life of relevant customer relationship	5 years

Accounts Receivable - Allowance

Accounts Receivable - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Accounts Receivable [Abstract]
Allowance for Credit Losses, Beginning Balance	$ 22,939	$ 18,480
Current period provision for expected credit losses	13,363	11,097
Write-offs charged against the allowance	(17,049)	(12,866)
Recoveries collected	4,711	3,912
Impact of changes in foreign currency	6	(111)
Allowance for Credit Losses, Ending Balance	$ 23,970	$ 20,512

Landfill Accounting - Landfills

Landfill Accounting - Landfills Owned and Operated (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($) site	Dec. 31, 2022 USD ($)
Landfill Accounting [Line Items]
Number of landfills owned and operated by company	91
Number of landfills operated, not owned, under life-of-site operating agreements	5
Number of landfills operated under limited-term operating agreements	7
Property and equipment, net \| $	$ 7,096,769	$ 6,950,915
Average remaining landfill life based on permitted capacity and projected annual disposal volumes	33 years
Number of owned landfills the company is seeking to expand	9
Number of landfills operated under life-of-site operating agreements that the company is seeking to expand	2
Average remaining landfill life based on permitted capacity, projected annual disposal volumes and probable expansion capacity	36 years
Life of Company's owned landfills and landfills operated under life-of-site operating agreements min range	2 years
Life of Company's owned landfills and landfills operated under life of site operating agreements max range	308 years
Percentage of projected annual disposal volume from landfills with remaining lives within threshold period	90%
Threshold period used for measurement of projected annual disposal volume from landfills	70 years
Landfill
Landfill Accounting [Line Items]
Property and equipment, net \| $	$ 3,333,390

Landfill Accounting - Landfill

Landfill Accounting - Landfill Depletion (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($) $ / T	Sep. 30, 2022 USD ($) $ / T
Landfill Accounting [Abstract]
Landfill depletion expense \| $	$ 192,314	$ 172,118
Average rate per ton consumed related to landfill depletion at owned landfills and landfills operated under life-of-site agreements \| $ / T	5.11	4.88

Landfill Accounting - Reserve A

Landfill Accounting - Reserve Assumptions and Accretion Expense (Details) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($) $ / T	Sep. 30, 2022 USD ($) $ / T	Dec. 31, 2022
Landfill Accounting [Line Items]
Accretion expense associated with landfill obligations \| $	$ 13,554	$ 12,008
Average rate per ton consumed related to final capping, closure and post-closure landfill accretion expense \| $ / T	0.36	0.34
Landfill
Landfill Accounting [Line Items]
Inflation rate for purposes of computing layers for final capping, closure and post-closure obligations	2.75%
Landfill \| Minimum
Landfill Accounting [Line Items]
Inflation rate for purposes of computing layers for final capping, closure and post-closure obligations			2.25%
Landfill \| Maximum
Landfill Accounting [Line Items]
Inflation rate for purposes of computing layers for final capping, closure and post-closure obligations			2.75%
Landfill \| Measurement Input, Discount Rate
Landfill Accounting [Line Items]
Discount rate for purposes of computing layers for final capping, closure and post-closure obligations	5.50%
Landfill \| Measurement Input, Discount Rate \| Minimum
Landfill Accounting [Line Items]
Discount rate for purposes of computing layers for final capping, closure and post-closure obligations			3.25%
Landfill \| Measurement Input, Discount Rate \| Maximum
Landfill Accounting [Line Items]
Discount rate for purposes of computing layers for final capping, closure and post-closure obligations			5.50%

Landfill Accounting - Final Cap

Landfill Accounting - Final Capping, Closure and Post-Closure Liability (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Landfill Accounting [Abstract]
Final capping, closure and post-closure liability at the beginning of the period	$ 344,606
Liability adjustments	25,542
Accretion expense associated with landfill obligations	13,554	$ 12,008
Closure payments	(14,864)
Assumption of closure liabilities from acquisitions	7,687
Foreign currency translation adjustment	56
Final capping, closure and post-closure liability at the end of the period	$ 376,581

Landfill Accounting - Liability

Landfill Accounting - Liability Adjustments and Restricted Cash and Investments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Landfill Accounting [Line Items]
Liability adjustments	$ 25,542
Restricted cash	102,844	$ 102,727
Restricted investments	75,990	68,099
Landfill
Landfill Accounting [Line Items]
Restricted cash	7,197	6,890
Restricted investments	$ 64,090	$ 57,469

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details) $ in Thousands	9 Months Ended		12 Months Ended
Acquisitions - Narrative (Details) $ in Thousands	Sep. 30, 2023 USD ($) entity	Sep. 30, 2022 USD ($) entity	Sep. 30, 2023 USD ($) entity
Business Acquisition [Line Items]
Number of immaterial businesses acquired in period		15
Acquisition-related costs \| $	$ 7,014	$ 18,694
Goodwill expected to be deductible for tax purposes \| $	317,190	272,186	$ 317,190
Trade receivables acquired in business combination gross contractual amount \| $	15,538	37,486	15,538
Trade receivables acquired in business combination expected to be uncollectible amount \| $	126	$ 5,157	$ 126
Number of individually immaterial acquisitions			4
Number of immaterial businesses acquired in period		15
Acquisition-related costs \| $	7,014	$ 18,694
Payment of contingent consideration recorded at acquisition date \| $	$ 4,255	$ 12,114
Solid Waste
Business Acquisition [Line Items]
Number of immaterial businesses acquired in period	9
Number of immaterial businesses acquired in period	9
Exploration and Production Waste Treatment Recovery and Disposal
Business Acquisition [Line Items]
Number of immaterial businesses acquired in period	1
Number of immaterial businesses acquired in period	1

Acquisitions - Consideration Tr

Acquisitions - Consideration Transferred to Acquire Businesses and Assets Acquired, Liabilities Assumed Schedule (Detail) $ in Thousands	9 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) entity
Fair value of consideration transferred:
Cash	$ 573,185	$ 1,272,910
Consideration transferred	646,582	1,369,724
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts receivable	15,412	32,329	$ 15,412
Prepaid expenses and other current assets	4,474	6,549	4,474
Restricted investments	5,462	0	5,462
Operating lease right-of-use assets	14,048	3,160	14,048
Property and equipment	186,130	617,267	186,130
Other assets	24	0	24
Current portion of operating lease liabilities	(366)	(1,100)	(366)
Deferred revenue	(1,333)	(7,766)	(1,333)
Long-term portion of operating lease liabilities	(13,682)	(2,060)	(13,682)
Other long-term liabilities	(10,439)	(3,498)	(10,439)
Deferred income taxes	(3,501)	(26,440)	(3,501)
Total identifiable net assets	238,806	853,283	238,806
Goodwill	407,776	516,441
Goodwill expected to be deductible for tax purposes	317,190	272,186	$ 317,190
Number of individually immaterial acquisitions \| entity			4
Trade receivables acquired in business combination gross contractual amount	15,538	37,486	$ 15,538
Trade receivables acquired in business combination expected to be uncollectible amount	126	5,157	126
Accounts Payable and Accrued Liabilities
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts payable and accrued liabilities	(11,005)	(34,905)	(11,005)
Debt
Fair value of consideration transferred:
Debt assumed	73,397	96,814
Contingent Consideration
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Contingent consideration	(13,350)	(6,543)	(13,350)
Long Term Franchise Agreements And Contracts
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles	59,509	109,364	59,509
Customer Lists
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles	5,020	69,378	5,020
Permits and Other
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles	$ 2,403	$ 97,548	$ 2,403

Intangible Assets, Net - Narrat

Intangible Assets, Net - Narrative (Details)	9 Months Ended
Intangible Assets, Net - Narrative (Details)	Sep. 30, 2023
Long-term Franchise Agreements and Contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period of acquired intangible assets	20 years 6 months
Customer Lists
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period of acquired intangible assets	11 years 8 months 12 days
Permits and Other
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period of acquired intangible assets	40 years

Intangible Assets, Net - Intang

Intangible Assets, Net - Intangible Assets Exclusive of Goodwill (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	$ 2,526,654	$ 2,472,990
Gross Carrying Amount, Intangible Assets	2,708,267	2,654,603
Accumulated Amortization, Finite-Lived Intangible Assets	(1,048,791)	(939,902)
Accumulated Impairment Loss, Finite-Lived Intangible Assets	(40,784)	(40,784)
Accumulated Impairment Loss, Intangible Assets	(40,784)	(40,784)
Net Carrying Amount, Finite-Lived Intangible Assets	1,437,079	1,492,304
Net Carrying Amount, Intangible Assets	1,618,692	1,673,917
Solid Waste Collection and Transportation Permits
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Net Carrying Amount, Indefinite-Lived Intangible Assets	181,613	181,613
Long-term Franchise Agreements and Contracts
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	963,690	916,582
Accumulated Amortization, Finite-Lived Intangible Assets	(338,262)	(297,382)
Net Carrying Amount, Finite-Lived Intangible Assets	625,428	619,200
Customer Lists
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	780,712	776,719
Accumulated Amortization, Finite-Lived Intangible Assets	(577,744)	(527,425)
Net Carrying Amount, Finite-Lived Intangible Assets	202,968	249,294
Permits and Other
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	782,252	779,689
Accumulated Amortization, Finite-Lived Intangible Assets	(132,785)	(115,095)
Accumulated Impairment Loss, Finite-Lived Intangible Assets	(40,784)	(40,784)
Net Carrying Amount, Finite-Lived Intangible Assets	$ 608,683	$ 623,810

Intangible Assets, Net - Estima

Intangible Assets, Net - Estimated Future Amortization Expense, Intangible Assets (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Intangible Assets, Net [Abstract]
For the year ending December 31, 2023	$ 157,219
For the year ending December 31, 2024	139,959
For the year ending December 31, 2025	123,027
For the year ending December 31, 2026	107,340
For the year ending December 31, 2027	$ 93,670

Leases - Narrative (Details)

Leases - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
Leases - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating lease impairment charge	$ 0	$ 0
Finance lease impairment charge	$ 0	$ 0

Leases - Operating and Financin

Leases - Operating and Financing Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Lease cost for operating leases
Operating lease cost	$ 11,914	$ 9,822	$ 34,881	$ 30,814
Amortization of leased assets	733	682	2,098	1,802
Interest on leased liabilities	63	61	168	161
Total lease cost	$ 12,710	$ 10,565	$ 37,147	$ 32,777

Leases - Supplemental Cash Flow

Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Lessee Disclosure [Abstract]
Operating cash flows from operating leases	$ 33,967	$ 30,313
Operating cash flows from finance leases	168	161
Financing cash flows from finance leases	2,079	1,758
Right-of-use assets obtained in exchange for lease liabilities - operating leases	85,377	53,967
Right-of-use assets obtained in exchange for lease liabilities - finance leases	$ 1,388	$ 3,369

Leases - Weighted-Average Remai

Leases - Weighted-Average Remaining Lease Term And Discount Rate (Details)	Sep. 30, 2023	Sep. 30, 2022
Lessee Disclosure [Abstract]
Weighted average remaining lease term - operating leases	11 years 1 month 6 days	8 years 10 months 24 days
Weighted average remaining lease term - finance leases	3 years 10 months 24 days	4 years 4 months 24 days
Weighted average discount rate - operating leases	3.92%	2.96%
Weighted average discount rate - finance leases	2.35%	1.96%

Leases - Future Minimum Lease P

Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Future Minimum Lease Payments, Operating Leases
Last 3 months of 2023	$ 11,634
2024	40,695
2025	34,940
2026	32,313
2027	31,270
Thereafter	198,782
Minimum lease payments	349,634
Less: imputed interest	(77,189)
Present value of minimum lease payments	272,445
Less: current portion of operating lease liabilities	(32,677)	$ (35,170)
Long-term portion of operating lease liabilities	239,768	165,462
Future Minimum Lease Payments, Finance Leases
Last 3 months of 2023	798
2024	3,194
2025	3,194
2026	2,608
2027	1,186
Thereafter	293
Minimum lease payments	11,273
Less: imputed interest, finance leases	(501)
Present value of minimum lease payments, finance leases	$ 10,772	$ 11,464
Finance Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Long-term Debt and Lease Obligation, Long-term Debt and Lease Obligation, Current
Less: current portion of finance lease liabilities	$ (2,962)
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Long-term Debt and Lease Obligation, Current
Long-term portion of finance lease liabilities	$ 7,810
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Long-term Debt and Lease Obligation

Long-Term Debt - Schedule of LT

Long-Term Debt - Schedule of LT Debt and Capital Lease Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Finance leases	$ 10,772	$ 11,464
Total debt and lease obligations	6,898,437	6,963,401
Less - current portion	(32,760)	(6,759)
Less - unamortized debt discount and issuance costs	(62,238)	(66,493)
Long-term Debt and Lease Obligation	$ 6,803,439	6,890,149
Minimum
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Finance leases interest rate	1.89%
Maximum
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Finance leases interest rate	5.07%
Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
Long Term Debt	$ 531,618	614,705
Credit Agreement \| Revolving Credit Facility \| Minimum
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Line of credit, interest rate	6.38%
Credit Agreement \| Revolving Credit Facility \| Maximum
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Line of credit, interest rate	8.50%
Credit Agreement \| Term Loan Facility
Debt Instrument [Line Items]
Long Term Debt	$ 650,000	650,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Line of credit, interest rate	6.43%
Term Loan Agreement \| Term Loan Facility
Debt Instrument [Line Items]
Long Term Debt	$ 800,000	800,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Line of credit, interest rate	6.43%
Senior Notes due 2028 \| Senior Notes
Debt Instrument [Line Items]
Long Term Debt	$ 500,000	$ 500,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Interest rate	4.25%	4.25%
Senior Notes due 2029 \| Senior Notes
Debt Instrument [Line Items]
Long Term Debt	$ 500,000	$ 500,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Interest rate	3.50%	3.50%
Senior Notes due 2030 \| Senior Notes
Debt Instrument [Line Items]
Long Term Debt	$ 600,000	$ 600,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Interest rate	2.60%	2.60%
Senior Notes due 2032 \| Senior Notes
Debt Instrument [Line Items]
Long Term Debt	$ 650,000	$ 650,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Interest rate	2.20%	2.20%
New Senior Notes due 2032 \| Senior Notes
Debt Instrument [Line Items]
Long Term Debt	$ 500,000	$ 500,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Interest rate	3.20%	3.20%
Senior Notes due 2033 \| Senior Notes
Debt Instrument [Line Items]
Long Term Debt	$ 750,000	$ 750,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Interest rate	4.20%	4.20%
Senior Notes due 2050 \| Senior Notes
Debt Instrument [Line Items]
Long Term Debt	$ 500,000	$ 500,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Interest rate	3.05%	3.05%
Senior Notes due 2052 \| Senior Notes
Debt Instrument [Line Items]
Long Term Debt	$ 850,000	$ 850,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Interest rate	2.95%	2.95%
Notes Payable to Sellers and Other Third Parties
Debt Instrument [Line Items]
Long Term Debt	$ 56,047	$ 37,232
Notes Payable to Sellers and Other Third Parties \| Minimum
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Interest rate	2.42%
Notes Payable to Sellers and Other Third Parties \| Maximum
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Interest rate	10.35%

Long-Term Debt - Credit Agreeme

Long-Term Debt - Credit Agreement Schedule (Details) - Credit Agreement - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Revolving Credit Facility
Debt Instrument [Line Items]
Available	$ 1,278,859	$ 1,193,502
Amount drawn	$ 531,618	$ 614,705
Commitment - rate applicable	0.09%	0.09%
Revolving Credit Facility \| SOFR \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Amount drawn	$ 335,000	$ 391,000
Interest rate applicable	6.43%	5.42%
Revolving Credit Facility \| SOFR \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Amount drawn	$ 30,000	$ 0
Interest rate applicable	6.42%	0%
Revolving Credit Facility \| Base Rate
Debt Instrument [Line Items]
Amount drawn	$ 15,000	$ 0
Interest rate applicable	8.50%	0%
Revolving Credit Facility \| Canadian Prime Rate
Debt Instrument [Line Items]
Amount drawn	$ 11,094	$ 0
Interest rate applicable	7.20%	0%
Revolving Credit Facility \| Canadian Bankers Acceptance Loan \| Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Amount drawn	$ 85,054	$ 223,705
Interest rate applicable	6.38%	5.74%
Revolving Credit Facility \| Canadian Bankers Acceptance Loan \| Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Amount drawn	$ 55,470
Interest rate applicable	6.38%
Letter of Credit
Debt Instrument [Line Items]
Letter of credit	$ 39,523	$ 41,793
Term Loan Facility \| SOFR
Debt Instrument [Line Items]
Amount drawn	$ 650,000	$ 650,000
Interest rate applicable	6.43%	5.42%

Long-Term Debt - Credit Agree_2

Long-Term Debt - Credit Agreement Narrative (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Letter of Credit \| Other Facilities Not Affiliated With Credit Agreement
Debt Instrument [Line Items]
Letter of credit	$ 102,229

10-K Long-Term Debt - Credit Ag

10-K Long-Term Debt - Credit Agreement Narrative (Details) - Letter of Credit - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Credit Agreement
Debt Instrument [Line Items]
Letter of credit	$ 39,523	$ 41,793
Other Facilities Not Affiliated With Credit Agreement
Debt Instrument [Line Items]
Letter of credit	$ 102,229

Segment Reporting - Narrative (

Segment Reporting - Narrative (Details)	9 Months Ended
Segment Reporting - Narrative (Details)	Sep. 30, 2023 segment
Segment Reporting [Abstract]
Number of contracts or customers accounted for more than 10% of the Company's total revenues at the consolidated or reportable segment level	No single contract or customer accounted for more than 10% of the Company’s total revenues at the consolidated or reportable segment level during the periods presented.
Number of operating segments	6
Number of reportable segments	6

Segment Reporting - Summary of

Segment Reporting - Summary of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Reporting Information [Line Items]
Revenue	$ 2,064,744		$ 1,879,868		$ 5,986,342	$ 5,342,558
Segment EBITDA	663,825	[1]	572,352	[1]	1,831,082	1,625,814
Total assets	17,731,240				17,731,240		$ 17,134,603
Intercompany Revenue
Segment Reporting Information [Line Items]
Revenue	(294,698)	[2]	(258,368)	[2]	(857,029)	(731,760)
Reportable Segments
Segment Reporting Information [Line Items]
Revenue	2,359,442		2,138,236		6,843,371	6,074,318
Segment EBITDA	666,554		584,009		1,853,224	1,644,856
Corporate
Segment Reporting Information [Line Items]
Revenue	0	[2]	0	[2]	0	0
Segment EBITDA	(2,729)	[1]	(11,657)	[1]	(22,142)	(19,042)
Total assets	445,662				445,662		426,542
Southern
Segment Reporting Information [Line Items]
Revenue	413,578		383,437		1,227,532	1,103,299
Southern \| Intercompany Revenue
Segment Reporting Information [Line Items]
Revenue	(51,556)	[2]	(46,350)	[2]	(155,149)	(129,003)
Southern \| Reportable Segments
Segment Reporting Information [Line Items]
Revenue	465,134		429,787		1,382,681	1,232,302
Segment EBITDA	133,072	[1]	122,472	[1]	384,660	341,006
Total assets	3,478,012				3,478,012		3,410,888
Western
Segment Reporting Information [Line Items]
Revenue	432,462		370,189		1,247,273	1,050,433
Western \| Intercompany Revenue
Segment Reporting Information [Line Items]
Revenue	(53,889)	[2]	(42,739)	[2]	(155,355)	(129,159)
Western \| Reportable Segments
Segment Reporting Information [Line Items]
Revenue	486,351		412,928		1,402,628	1,179,592
Segment EBITDA	124,433	[1]	109,736	[1]	354,682	315,114
Total assets	3,409,663				3,409,663		3,239,679
Central
Segment Reporting Information [Line Items]
Revenue	372,862		338,889		1,082,032	954,137
Central \| Intercompany Revenue
Segment Reporting Information [Line Items]
Revenue	(46,307)	[2]	(41,867)	[2]	(136,638)	(113,854)
Central \| Reportable Segments
Segment Reporting Information [Line Items]
Revenue	419,169		380,756		1,218,670	1,067,991
Segment EBITDA	137,823	[1]	122,471	[1]	384,538	333,866
Total assets	2,801,263				2,801,263		2,803,853
Eastern
Segment Reporting Information [Line Items]
Revenue	353,109		329,258		1,025,662	909,914
Eastern \| Intercompany Revenue
Segment Reporting Information [Line Items]
Revenue	(67,746)	[2]	(55,946)	[2]	(189,604)	(154,322)
Eastern \| Reportable Segments
Segment Reporting Information [Line Items]
Revenue	420,855		385,204		1,215,266	1,064,236
Segment EBITDA	100,779	[1]	77,384	[1]	260,569	214,335
Total assets	3,156,943				3,156,943		2,752,436
Canada
Segment Reporting Information [Line Items]
Revenue	263,095		242,314		738,956	707,404
Canada \| Intercompany Revenue
Segment Reporting Information [Line Items]
Revenue	(29,256)	[2]	(27,727)	[2]	(85,347)	(82,127)
Canada \| Reportable Segments
Segment Reporting Information [Line Items]
Revenue	292,351		270,041		824,303	789,531
Segment EBITDA	108,524	[1]	87,910	[1]	286,703	265,402
Total assets	2,734,397				2,734,397		2,773,882
MidSouth
Segment Reporting Information [Line Items]
Revenue	229,638		215,781		664,887	617,371
MidSouth \| Intercompany Revenue
Segment Reporting Information [Line Items]
Revenue	(45,944)	[2]	(43,739)	[2]	(134,936)	(123,295)
MidSouth \| Reportable Segments
Segment Reporting Information [Line Items]
Revenue	275,582		259,520		799,823	740,666
Segment EBITDA	61,923	[1]	$ 64,036	[1]	182,072	$ 175,133
Total assets	$ 1,705,300				$ 1,705,300		$ 1,727,323

[1] For those items included in the determination of segment EBITDA, the accounting policies of the segments are the same as those described in the Company’s most recent Annual Report on Form 10-K. Intercompany revenues reflect each segment’s total intercompany sales, including intercompany sales within a segment and between segments. Transactions within and between segments are made on a basis intended to reflect the market value of the service.

Segment Reporting - Changes in

Segment Reporting - Changes in Goodwill by Reportable Segment (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 6,902,297	$ 6,187,643
Goodwill acquired	411,441	508,388
Goodwill acquisition adjustments	(3,665)	8,053
Impact of changes in foreign currency	3,011	(129,224)
Goodwill, Ending Balance	7,313,084	6,574,860
Southern \| Reportable Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	1,547,894	1,457,437
Goodwill acquired	0	85,004
Goodwill acquisition adjustments	(1,450)	0
Impact of changes in foreign currency	0	0
Goodwill, Ending Balance	1,546,444	1,542,441
Western \| Reportable Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	732,335	503,223
Goodwill acquired	45,072	0
Goodwill acquisition adjustments	0	8,060
Impact of changes in foreign currency	0	0
Goodwill, Ending Balance	777,407	511,283
Central \| Reportable Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	1,003,470	931,269
Goodwill acquired	3,605	73,787
Goodwill acquisition adjustments	0	0
Impact of changes in foreign currency	0	0
Goodwill, Ending Balance	1,007,075	1,005,056
Eastern \| Reportable Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	1,189,111	992,578
Goodwill acquired	361,398	181,671
Goodwill acquisition adjustments	0	0
Impact of changes in foreign currency	0	0
Goodwill, Ending Balance	1,550,509	1,174,249
Canada \| Reportable Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	1,684,670	1,559,512
Goodwill acquired	0	167,926
Goodwill acquisition adjustments	(2,215)	0
Impact of changes in foreign currency	3,011	(129,224)
Goodwill, Ending Balance	1,685,466	1,598,214
MidSouth \| Reportable Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	744,817	743,624
Goodwill acquired	1,366	0
Goodwill acquisition adjustments	0	(7)
Impact of changes in foreign currency	0	0
Goodwill, Ending Balance	$ 746,183	$ 743,617

Segment Reporting - Assets by R

Segment Reporting - Assets by Reportable Segments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total assets	$ 17,731,240	$ 17,134,603
Corporate
Segment Reporting Information [Line Items]
Total assets	445,662	426,542
Southern \| Reportable Segments
Segment Reporting Information [Line Items]
Total assets	3,478,012	3,410,888
Western \| Reportable Segments
Segment Reporting Information [Line Items]
Total assets	3,409,663	3,239,679
Central \| Reportable Segments
Segment Reporting Information [Line Items]
Total assets	2,801,263	2,803,853
Eastern \| Reportable Segments
Segment Reporting Information [Line Items]
Total assets	3,156,943	2,752,436
Canada \| Reportable Segments
Segment Reporting Information [Line Items]
Total assets	2,734,397	2,773,882
MidSouth \| Reportable Segments
Segment Reporting Information [Line Items]
Total assets	$ 1,705,300	$ 1,727,323

Segment Reporting - Reconciliat

Segment Reporting - Reconciliation of Segment EBITDA to Income Before Income Tax Provision (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023	Sep. 30, 2022
Segment EBITDA	$ 663,825	[1]	$ 572,352	[1]	$ 1,831,082	$ 1,625,814
Depreciation	(214,966)		(193,287)		(632,347)	(562,174)
Amortization of intangibles	(39,405)		(38,859)		(117,740)	(113,956)
Impairments and other operating items	(56,477)		(13,438)		(69,201)	(19,467)
Interest expense	(69,016)		(51,161)		(204,914)	(137,565)
Interest income	2,833		1,784		6,886	2,574
Other income (expense), net	5,372		8,487		8,346	2,373
Income before income tax provision	292,166		285,878		822,112	797,599
Reportable Segments
Segment EBITDA	666,554		584,009		1,853,224	1,644,856
Corporate
Segment EBITDA	(2,729)	[1]	(11,657)	[1]	(22,142)	(19,042)
Eastern \| Reportable Segments
Segment EBITDA	100,779	[1]	77,384	[1]	260,569	214,335
Southern \| Reportable Segments
Segment EBITDA	133,072	[1]	122,472	[1]	384,660	341,006
Western \| Reportable Segments
Segment EBITDA	124,433	[1]	109,736	[1]	354,682	315,114
Central \| Reportable Segments
Segment EBITDA	137,823	[1]	122,471	[1]	384,538	333,866
Canada \| Reportable Segments
Segment EBITDA	108,524	[1]	87,910	[1]	286,703	265,402
MidSouth \| Reportable Segments
Segment EBITDA	$ 61,923	[1]	$ 64,036	[1]	$ 182,072	$ 175,133

[1] For those items included in the determination of segment EBITDA, the accounting policies of the segments are the same as those described in the Company’s most recent Annual Report on Form 10-K.

Derivative Financial Instrume_3

Derivative Financial Instruments - Interest Rate Swaps (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2023 USD ($) agreement
Derivative [Line Items]
Number of interest rate swap agreements \| agreement	4
Interest Rate Swap One
Derivative [Line Items]
Date entered	2017-08
Notional amount	$ 200,000
Fixed interest rate paid	2.123%
Variable interest rate received	1-month Term SOFR
Effective date	2022-11
Expiration date	2025-10
Interest Rate Swap Two
Derivative [Line Items]
Date entered	2018-06
Notional amount	$ 200,000
Fixed interest rate paid	2.848%
Variable interest rate received	1-month Term SOFR
Effective date	2022-11
Expiration date	2025-10
Interest Rate Swap Three
Derivative [Line Items]
Date entered	2018-06
Notional amount	$ 200,000
Fixed interest rate paid	2.8284%
Variable interest rate received	1-month Term SOFR
Effective date	2022-11
Expiration date	2025-10
Interest Rate Swap Four
Derivative [Line Items]
Date entered	2018-12
Notional amount	$ 200,000
Fixed interest rate paid	2.7715%
Variable interest rate received	1-month Term SOFR
Effective date	2022-11
Expiration date	2027-07

Derivative Financial Instrume_4

Derivative Financial Instruments - FV of Cash Flow Hedges (Details) - USD ($) $ in Thousands	Sep. 30, 2023		Dec. 31, 2022
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, asset derivatives	$ 38,665		$ 31,807
Interest Rate Swap \| Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, asset derivatives	21,166	[1]	17,906	[2]
Interest Rate Swap \| Other Assets
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, asset derivatives	$ 17,499		$ 13,901

[1] Represents the estimated amount of the existing unrealized gains on interest rate swaps at September 30, 2023 (based on the interest rate yield curve at that date), included in AOCIL expected to be reclassified into pre-tax earnings within the next 12 months. The actual amounts reclassified into earnings are dependent on future movements in interest rates. In accordance with the derivatives and hedging guidance, the changes in fair values of interest rate swaps have been recorded in equity as a component of AOCIL. As the critical terms of the interest rate swaps match the underlying debt being hedged, all unrealized changes in fair value are recorded in AOCIL.

Derivative Financial Instrume_5

Derivative Financial Instruments - Cash Flow Hedges Impact on Financial Results (Details) - USD ($) $ in Thousands	3 Months Ended								9 Months Ended
	Sep. 30, 2023		Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022		Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	$ (5,724)		$ (12,120)	$ 2,425	$ (20,344)		$ (1,904)	$ (32,854)
Amounts reclassified into earnings, net of taxes	(3,885)		$ (3,494)	$ (2,999)	697		$ 2,680	$ 3,491
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	(5,724)				(20,344)				$ (15,419)	$ (55,102)
Amounts reclassified into earnings, net of taxes	(3,885)				697				(10,378)	6,868
Cash Flow Hedging \| Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amounts reclassified into earnings, net of taxes	(3,885)	[1]			697	[1]			(10,378)	6,868
Cash Flow Hedging \| Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	$ (5,724)	[2]			$ 20,344	[2]			$ 15,419	$ 55,102

[1] Amounts reclassified from AOCIL into earnings related to realized gains and losses on interest rate swaps are recognized when interest payments or receipts occur related to the swap contracts, which correspond to when interest payments are made on the Company’s hedged debt. In accordance with the derivatives and hedging guidance, the changes in fair values of interest rate swaps have been recorded in equity as a component of AOCIL. As the critical terms of the interest rate swaps match the underlying debt being hedged, all unrealized changes in fair value are recorded in AOCIL.

Fair Value of Financial Instr_3

Fair Value of Financial Instruments - Carrying Values and Fair Values of Debt Instruments (Details) - Senior Notes - USD ($) $ in Thousands		Sep. 30, 2023	Dec. 31, 2022
Senior Notes due 2028
Debt Instrument [Line Items]
Carrying value of senior notes		$ 500,000	$ 500,000
Fair value of senior notes	[1]	$ 472,450	$ 470,850
Interest rate		4.25%	4.25%
Senior Notes due 2029
Debt Instrument [Line Items]
Carrying value of senior notes		$ 500,000	$ 500,000
Fair value of senior notes	[1]	$ 453,600	$ 457,650
Interest rate		3.50%	3.50%
Senior Notes due 2030
Debt Instrument [Line Items]
Carrying value of senior notes		$ 600,000	$ 600,000
Fair value of senior notes	[1]	$ 504,060	$ 510,540
Interest rate		2.60%	2.60%
Senior Notes due 2032
Debt Instrument [Line Items]
Carrying value of senior notes		$ 650,000	$ 650,000
Fair value of senior notes	[1]	$ 500,045	$ 514,540
Interest rate		2.20%	2.20%
New Senior Notes due 2032
Debt Instrument [Line Items]
Carrying value of senior notes		$ 500,000	$ 500,000
Fair value of senior notes	[1]	$ 414,250	$ 429,000
Interest rate		3.20%	3.20%
Senior Notes due 2033
Debt Instrument [Line Items]
Carrying value of senior notes		$ 750,000	$ 750,000
Fair value of senior notes	[1]	$ 668,475	$ 699,450
Interest rate		4.20%	4.20%
Senior Notes due 2050
Debt Instrument [Line Items]
Carrying value of senior notes		$ 500,000	$ 500,000
Fair value of senior notes	[1]	$ 316,250	$ 343,300
Interest rate		3.05%	3.05%
Senior Notes due 2052
Debt Instrument [Line Items]
Carrying value of senior notes		$ 850,000	$ 850,000
Fair value of senior notes	[1]	$ 516,035	$ 561,425
Interest rate		2.95%	2.95%

[1] Senior Notes are classified as Level 2 within the fair value hierarchy. Fair value inputs include third-party calculations of the market interest rate of notes with similar ratings in similar industries over the remaining note terms.

10-K Fair Value of Financial In

10-K Fair Value of Financial Instruments - Level 3 Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended		21 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023
Fair Value [Abstract]
Beginning balance	$ 81,415	$ 94,308	$ 94,308
Contingent consideration recorded at acquisition date	13,350	6,543
Payment of contingent consideration recorded at acquisition date	(4,255)	(12,114)
Payment of contingent consideration recorded in earnings	0	(2,982)
Payment of contingent consideration recorded in earnings, location			Impairments and other operating items
Adjustments to contingent consideration	30,367	(1,030)
Interest accretion expense	1,131	1,073
Foreign currency translation adjustment	0	(35)
Ending balance	$ 122,008	$ 85,763	$ 122,008

Net Income Per Share Informat_3

Net Income Per Share Information - Basic and Diluted Net Income Per Common Share (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income attributable to Waste Connections for basic and diluted earnings per share	$ 229,026	$ 236,912	$ 636,047	$ 641,310
Denominator:
Basic shares outstanding	257,633,703	257,197,010	257,535,408	257,438,756
Dilutive effect of equity-based awards	595,701	694,625	575,076	621,995
Diluted shares outstanding	258,229,404	257,891,635	258,110,484	258,060,751

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	$ 102,844	$ 102,727
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	102,844	102,727
Restricted investments	75,618	66,402
Contingent consideration	(122,008)	(81,415)
Fair Value, Measurements, Recurring \| Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instrument - net	38,665	31,807
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	102,844	102,727
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments	75,618	66,402
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 \| Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instrument - net	38,665	31,807
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	$ (122,008)	$ (81,415)

Fair Value Measurements - Ass_2

Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	$ 102,844	$ 102,727
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	102,844	102,727
Restricted investments	75,618	66,402
Contingent consideration	(122,008)	(81,415)
Fair Value, Measurements, Recurring \| Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instrument - net	38,665	31,807
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	102,844	102,727
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments	75,618	66,402
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2 \| Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instrument - net	38,665	31,807
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	$ (122,008)	$ (81,415)

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value for Level 3 Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended		21 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023
Fair Value [Abstract]
Contingent consideration recorded at acquisition date	$ 13,350	$ 6,543
Payment of contingent consideration recorded at acquisition date	(4,255)	(12,114)
Payment of contingent consideration recorded in earnings		(2,982)
Payment of contingent consideration recorded in earnings	0	(2,982)
Payment of contingent consideration recorded in earnings, location			Impairments and other operating items
Adjustments to contingent consideration	30,367	(1,030)
Interest accretion expense	1,131	1,073
Foreign currency translation adjustment	0	(35)
Ending balance	122,008	85,763	$ 122,008
Beginning balance	$ 81,415	$ 94,308	$ 94,308

Other Comprehensive Income (L_3

Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified into earnings, net of taxes	$ (3,885)	$ (3,494)	$ (2,999)	$ 697	$ 2,680	$ 3,491
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	5,724	12,120	(2,425)	20,344	1,904	32,854
Foreign currency translation adjustment, gross	(50,020)			(145,955)			$ 2,527	$ (185,030)
Foreign currency translation adjustment, tax								0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	(50,020)	50,865	1,682	(145,955)	(73,504)	34,429	2,527	(185,030)
Other Comprehensive Income (Loss), before Tax	(47,518)			(117,328)			9,386	(100,717)
Other Comprehensive Income (Loss), Tax	(663)			(7,586)			(1,818)	(22,343)
Other comprehensive income (loss), net of tax	(48,181)			(124,914)			7,568	(123,060)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified into earnings, net of taxes	(3,885)	(3,494)	(2,999)	697	2,680	3,491
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	5,724	12,120	(2,425)	20,344	1,904	32,854
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	(50,020)	$ 50,865	$ 1,682	(145,955)	$ (73,504)	$ 34,429	2,527	(185,030)
Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest rate swap amounts reclassified into interest expense	(5,286)			948			(14,120)	9,344
Amounts reclassified, tax	1,401			(251)			3,742	(2,476)
Amounts reclassified into earnings, net of taxes	(3,885)			697			(10,378)	6,868
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	7,788			27,679			20,979	74,969
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	(2,064)			(7,335)			(5,560)	(19,867)
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	$ 5,724			$ 20,344			$ 15,419	$ 55,102

Other Comprehensive Income (L_4

Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Other Comprehensive Income (Loss) [Abstract]
Foreign currency translation adjustment, gross	$ (50,020)			$ (145,955)			$ 2,527	$ (185,030)
Foreign currency translation adjustment, net	$ (50,020)	$ 50,865	$ 1,682	$ (145,955)	$ (73,504)	$ 34,429	$ 2,527	$ (185,030)

Other Comprehensive Income (L_5

Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount of Gain or (Loss) Recognized from AOCIL into Earnings, Net of Tax	$ 3,885	$ 3,494	$ 2,999	$ (697)	$ (2,680)	$ (3,491)
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	5,724	12,120	(2,425)	20,344	1,904	32,854
Foreign currency translation adjustment, gross	(50,020)			(145,955)			$ 2,527	$ (185,030)
Foreign currency translation adjustment, tax								0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	(50,020)	50,865	1,682	(145,955)	(73,504)	34,429	2,527	(185,030)
Other Comprehensive Income (Loss), before Tax	(47,518)			(117,328)			9,386	(100,717)
Other Comprehensive Income (Loss), Tax	663			7,586			1,818	22,343
Other comprehensive income (loss), net of tax	(48,181)			(124,914)			7,568	(123,060)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount of Gain or (Loss) Recognized from AOCIL into Earnings, Net of Tax	3,885	3,494	2,999	(697)	(2,680)	(3,491)
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	5,724	12,120	(2,425)	20,344	1,904	32,854
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	(50,020)	$ 50,865	$ 1,682	(145,955)	$ (73,504)	$ 34,429	2,527	(185,030)
Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest rate swap amounts reclassified into interest expense	(5,286)			948			(14,120)	9,344
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	(1,401)			251			(3,742)	2,476
Amount of Gain or (Loss) Recognized from AOCIL into Earnings, Net of Tax	3,885			(697)			10,378	(6,868)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	7,788			27,679			20,979	74,969
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	(2,064)			(7,335)			(5,560)	(19,867)
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	$ 5,724			$ 20,344			$ 15,419	$ 55,102

Other Comprehensive Income (L_6

Other Comprehensive Income (Loss) - Amounts Included in AOCIL (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Components of Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance			$ 7,108,698				$ 7,108,698
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	$ (50,020)	$ 50,865	1,682	$ (145,955)	$ (73,504)	$ 34,429	2,527	$ (185,030)
Stockholders' Equity Attributable to Parent, Ending Balance	7,586,199						7,586,199
Foreign currency translation adjustment	(50,020)	50,865	1,682	(145,955)	(73,504)	34,429	2,527	(185,030)
Accumulated Other Comprehensive Income (Loss)
Components of Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance			(56,830)			39,584	(56,830)	39,584
Amounts reclassified into earnings							(10,378)	(6,868)
Change in fair value							15,419	55,102
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(50,020)	50,865	1,682	(145,955)	(73,504)	34,429	2,527	(185,030)
Stockholders' Equity Attributable to Parent, Ending Balance	(49,262)			(83,476)			(49,262)	(83,476)
Foreign currency translation adjustment	(50,020)	$ 50,865	1,682	(145,955)	$ (73,504)	34,429	2,527	(185,030)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent \| Interest Rate Swap
Components of Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance			23,378			(37,544)	23,378	(37,544)
Amounts reclassified into earnings							(10,378)	(6,868)
Change in fair value							15,419	55,102
Stockholders' Equity Attributable to Parent, Ending Balance	28,419			24,426			28,419	24,426
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent \| Foreign Currency Translation Adjustment
Components of Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance			$ (80,208)			$ 77,128	(80,208)	77,128
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax							2,527	(185,030)
Stockholders' Equity Attributable to Parent, Ending Balance	$ (77,681)			$ (107,902)			(77,681)	(107,902)
Foreign currency translation adjustment							$ 2,527	$ (185,030)

Other Comprehensive Income (L_7

Other Comprehensive Income (Loss) - Amounts Included in AOCIL (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Other Comprehensive Income (Loss) [Abstract]
Foreign currency translation adjustment	$ (50,020)	$ 50,865	$ 1,682	$ (145,955)	$ (73,504)	$ 34,429	$ 2,527	$ (185,030)

Other Comprehensive Income (L_8

Other Comprehensive Income (Loss) - Amounts Included in AOCIL (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022
Components of Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance			$ 7,108,698				$ 7,108,698
Foreign currency translation adjustment	$ (50,020)	$ 50,865	1,682	$ (145,955)	$ (73,504)	$ 34,429	2,527	$ (185,030)
Stockholders' Equity Attributable to Parent, Ending Balance	7,586,199						7,586,199
Accumulated Other Comprehensive Income (Loss)
Components of Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance			(56,830)			39,584	(56,830)	39,584
Amounts reclassified into earnings							(10,378)	(6,868)
Change in fair value							15,419	55,102
Foreign currency translation adjustment	(50,020)	$ 50,865	1,682	(145,955)	$ (73,504)	34,429	2,527	(185,030)
Stockholders' Equity Attributable to Parent, Ending Balance	(49,262)			(83,476)			(49,262)	(83,476)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent \| Interest Rate Swap
Components of Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance			23,378			(37,544)	23,378	(37,544)
Amounts reclassified into earnings							(10,378)	(6,868)
Change in fair value							15,419	55,102
Stockholders' Equity Attributable to Parent, Ending Balance	28,419			24,426			28,419	24,426
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent \| Foreign Currency Translation Adjustment
Components of Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance			$ (80,208)			$ 77,128	(80,208)	77,128
Foreign currency translation adjustment							2,527	(185,030)
Stockholders' Equity Attributable to Parent, Ending Balance	$ (77,681)			$ (107,902)			$ (77,681)	$ (107,902)

Shareholders' Equity - Narrativ

Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended						6 Months Ended	7 Months Ended	9 Months Ended		72 Months Ended
	Nov. 30, 2022	Oct. 31, 2022	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Jul. 31, 2023	Dec. 31, 2016	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Jul. 25, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of shares under employee share purchase plan			$ 2,067		$ 1,841	$ 1,716		$ 1,554			$ 3,908	$ 3,271
Issuance of shares under employee share purchase plan, shares											29,808	26,582
Average daily trading volume during period									252,412
Repurchase of common stock (shares)											0	3,388,155
Aggregate cost of stock repurchased								424,999				$ 424,999
Aggregate cost of common stock repurchase
Maximum remaining number of shares available for repurchase			12,881,534								12,881,534
Maximum number of shares authorized for repurchase														12,881,534
Share repurchase plan expiration date											Aug. 09, 2024
Daily repurchase of shares, maximum									63,103
Daily Shares Repurchase (as percentage)			25%								25%
Cash dividend per share	$ 0.255	$ 0.23	$ 0.255			$ 0.230					$ 0.765	$ 0.690
Cash dividend per common share, increase	$ 0.025
Cash dividends on common stock			$ 65,676	$ 65,351	$ 65,788	$ 58,897	$ 59,421	$ 59,391			$ 196,815	$ 177,710
2020 Employee Share Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum percent of eligible compensation to purchase shares			1%								1%
Maximum percent of eligible compensation to purchase shares			10%								10%
Maximum number of share authorized to be issued under plan			1,000,000								1,000,000
Minimum \| 2020 Employee Share Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price percentage of closing price of common shares											85%
Maximum \| 2020 Employee Share Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercise price percentage of closing price of common shares											95%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of award											$ 133.65
Units granted in period											414,309
Vested deferred RSUs outstanding			62,059			81,352					62,059	81,352
Restricted Stock Units (RSUs) \| Progressive Waste Solutions Ltd.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units granted in period										0	0		0
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of award											$ 133.83
Units granted in period											113,347
Performance Shares \| 2023 Performance-Based Restricted Share Units, Plan One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period of award											3 years
Performance period end date											Dec. 31, 2025
Employee Stock Option \| Progressive Waste Solutions Ltd.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted in period										0	0		0
Deferred Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of award											$ 136.47
Units granted in period											3,945
Vested deferred RSUs outstanding			30,481								30,481		26,536
Progressive Waste Solutions Ltd. \| Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested deferred RSUs outstanding			52,026								52,026		57,829

Shareholders' Equity - Restrict

Shareholders' Equity - Restricted Share Units (RSUs) Activity Schedule (Details)	9 Months Ended
	Sep. 30, 2023 shares
Restricted Stock Units (RSUs)
Unvested shares
Outstanding, shares at beginning	955,999
Granted	414,309
Forfeited	(45,090)
Vested and issued	(370,766)
Outstanding at ending	62,059
Outstanding, shares at ending	954,452
Performance Shares
Unvested shares
Outstanding, shares at beginning	341,850
Granted	113,347
Vested and issued	(195,665)
Outstanding, shares at ending	259,532
Progressive Waste Solutions Ltd. \| Restricted Stock Units (RSUs)
Unvested shares
Outstanding at beginning	57,829
Cash settled	(5,803)
Outstanding at ending	52,026

Shareholders' Equity - Restri_2

Shareholders' Equity - Restricted Stock Units Activity (Details)	9 Months Ended
	Sep. 30, 2023 $ / shares shares
Restricted Stock Units (RSUs)
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]
Stock units granted \| shares	414,309
Weighted average grant-date fair value of award \| $ / shares	$ 133.65
Performance Shares
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]
Stock units granted \| shares	113,347
Weighted average grant-date fair value of award \| $ / shares	$ 133.83
Deferred Share Units
Schedule of Share based Compensation Arrangements by Share based Payment Award, Equity Instruments, Other Than Options, Restricted Stock Units [Line Items]
Stock units granted \| shares	3,945
Weighted average grant-date fair value of award \| $ / shares	$ 136.47

10-K Shareholders' Equity (Summ

10-K Shareholders' Equity (Summary of Activity Related to Restricted Stock Units) (Details)	9 Months Ended
	Sep. 30, 2023 $ / shares shares
Restricted Stock Units (RSUs)
Unvested shares
Outstanding, shares at beginning	955,999
Granted	414,309
Forfeited	(45,090)
Vested and issued	370,766
Outstanding at ending	62,059
Outstanding, shares at ending	954,452
Weighted-Average Grant Date Fair Value Per Share
Granted \| $ / shares	$ 133.65
Performance Shares
Unvested shares
Outstanding, shares at beginning	341,850
Granted	113,347
Vested and issued	195,665
Outstanding, shares at ending	259,532
Weighted-Average Grant Date Fair Value Per Share
Granted \| $ / shares	$ 133.83
Deferred Share Units
Unvested shares
Outstanding at beginning	26,536
Granted	3,945
Outstanding at ending	30,481
Weighted-Average Grant Date Fair Value Per Share
Granted \| $ / shares	$ 136.47
Progressive Waste Solutions Ltd. \| Restricted Stock Units (RSUs)
Unvested shares
Outstanding at beginning	57,829
Cash settled	(5,803)
Outstanding at ending	52,026

Shareholders' Equity - Summary

Shareholders' Equity - Summary of Warrant and Deferred Share Unit Activity (Details) - Deferred Share Units	9 Months Ended
	Sep. 30, 2023 shares
Warrant
Outstanding at beginning	26,536
Granted	3,945
Outstanding at ending	30,481

Shareholders' Equity - Summar_2

Shareholders' Equity - Summary of Vesting Activity Related to Restricted Share Units (Details) - Restricted Stock Units (RSUs)	9 Months Ended
	Sep. 30, 2023 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vested over remaining service period	370,766
Forfeited	(45,090)
Progressive Waste Solutions Ltd.
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cash settled	(5,803)

Shareholders' Equity - Summar_3

Shareholders' Equity - Summary of Stock Option Activity and Related Information (Details) - Progressive Waste Solutions Ltd.	9 Months Ended
	Sep. 30, 2023 shares
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding [Roll Forward]
Outstanding at beginning	43,570
Cash settled	(7,787)
Outstanding at ending	35,783

10-K - Shareholders' Equity (Su

10-K - Shareholders' Equity (Summary of Vesting Activity Related to Restricted Share Units) (Details) - Restricted Stock Units (RSUs)	9 Months Ended
	Sep. 30, 2023 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Forfeited	(45,090)
Progressive Waste Solutions Ltd.
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cash settled	(5,803)

Commitments and Contingencies -

Commitments and Contingencies - Narrative (Details) T in Millions				7 Months Ended	12 Months Ended
	Aug. 10, 2018 USD ($)	Jul. 17, 2018 USD ($)	Mar. 06, 2018 USD ($)	Jul. 25, 2017 USD ($)	Dec. 31, 2022 T	Sep. 30, 2023 USD ($)
Contingencies And Commitments [Line Items]
Threshold used for disclosing environmental matters involving potential monetary sanctions						$ 1,000,000
Bridge and Thoroughfare Fee
Contingencies And Commitments [Line Items]
Loss contingency amount sought		$ 11,600,000	$ 83,000	$ 11,600,000
Noncompliance fee			$ 750
Chiquita Canyon, LLC
Contingencies And Commitments [Line Items]
Annual tons of waste accepted at landfill \| T					2.6
Estimate of total new fees and other new taxes over the life of the conditional use permit						$ 300,000,000
Penalties \| Bridge and Thoroughfare Fee
Contingencies And Commitments [Line Items]
Fee paid	$ 83,000
Fees \| Bridge and Thoroughfare Fee
Contingencies And Commitments [Line Items]
Fee paid	$ 750

Commitments and Contingencies_2

Commitments and Contingencies - Narrative (Details) T in Millions				7 Months Ended	12 Months Ended
	Aug. 10, 2018 USD ($)	Jul. 17, 2018 USD ($)	Mar. 06, 2018 USD ($)	Jul. 25, 2017 USD ($)	Dec. 31, 2022 T	Sep. 30, 2023 USD ($)
Contingencies And Commitments [Line Items]
Threshold used for disclosing environmental matters involving potential monetary sanctions						$ 1,000,000
Bridge and Thoroughfare Fee
Contingencies And Commitments [Line Items]
Loss contingency amount sought		$ 11,600,000	$ 83,000	$ 11,600,000
Noncompliance fee			$ 750
Chiquita Canyon, LLC
Contingencies And Commitments [Line Items]
Annual tons of waste accepted at landfill \| T					2.6
Estimate of total new fees and other new taxes over the life of the conditional use permit						$ 300,000,000
Penalties \| Bridge and Thoroughfare Fee
Contingencies And Commitments [Line Items]
Fee paid	$ 83,000
Monthly payment estimate	83,000
Fees \| Bridge and Thoroughfare Fee
Contingencies And Commitments [Line Items]
Fee paid	750
Monthly payment estimate	$ 750

Subsequent Events (Details)

Subsequent Events (Details)		3 Months Ended	9 Months Ended
Subsequent Events (Details)	Oct. 25, 2023 $ / shares	Sep. 30, 2023 $ / shares	Sep. 30, 2023 segment
Subsequent Event [Line Items]
Number of Operating Segments \| segment			6
Dividends per share amount		$ 0.255
Subsequent Event
Subsequent Event [Line Items]
Dividends, date of record	Nov. 08, 2023
Dividends, date to be paid	Nov. 28, 2023
Dividends per share amount	$ 0.285
Dividends, declared date	Oct. 25, 2023
Increase in regular quarterly cash dividend per share	$ 0.03