10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

☑	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended March 31, 2024
	Or
☐	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period from                   to

Commission file number 1-34370

WASTE CONNECTIONS, INC.

(Exact name of registrant as specified in its charter)

Ontario, Canada

(State or other jurisdiction of incorporation or organization)

98-1202763

(I.R.S. Employer Identification No.)

6220 Hwy 7, Suite 600

Woodbridge

Ontario L4H 4G3

Canada

(Address of principal executive offices)

(905) 532-7510

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Shares, no par value	WCN	New York Stock Exchange (“NYSE”) Toronto Stock Exchange (“TSX”)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports); and (2) has been subject to such filing requirements for the past 90 days.

Yes þ No ◻

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).

Yes þ No ◻

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act. (Check one):

þ Large Accelerated
Filer ◻ Accelerated
Filer ◻ Non-accelerated
Filer ☐ Smaller Reporting
Company ☐ Emerging Growth
Company

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ◻

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes ☐ No þ

Indicate the number of shares outstanding of each of the issuer’s classes of common shares:

As of April 12, 2024: 258,021,193 common shares

WASTE CONNECTIONS, INC.

FORM 10-Q

TABLE OF CONTENTS

		Page
PART I – FINANCIAL INFORMATION (unaudited)
Item 1.	Financial Statements
	Condensed Consolidated Balance Sheets	1
	Condensed Consolidated Statements of Net Income	2
	Condensed Consolidated Statements of Comprehensive Income	3
	Condensed Consolidated Statements of Equity	4
	Condensed Consolidated Statements of Cash Flows	6
	Notes to Condensed Consolidated Financial Statements	7
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	33
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	52
Item 4.	Controls and Procedures	54
PART II – OTHER INFORMATION
Item 1.	Legal Proceedings	55
Item 6.	Exhibits	55
Signatures		56

PART I – FINANCIAL INFORMATION

Item 1. Financial Statements

WASTE CONNECTIONS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

(In thousands of U.S. dollars, except share and per share amounts)

	March 31,		December 31,
	2024		2023
ASSETS
Current assets:
Cash and equivalents	$	111,985	$	78,399
Accounts receivable, net of allowance for credit losses of $22,858 and $23,553 at March 31, 2024 and December 31, 2023, respectively		896,682		856,953
Prepaid expenses and other current assets		208,387		206,433
Total current assets		1,217,054		1,141,785
Restricted cash		105,683		105,639
Restricted investments		74,655		70,350
Property and equipment, net		7,827,304		7,228,331
Operating lease right-of-use assets		273,371		261,782
Goodwill		7,597,175		7,404,400
Intangible assets, net		1,877,226		1,603,541
Other assets, net		110,192		100,048
Total assets	$	19,082,660	$	17,915,876
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable	$	589,861	$	642,455
Book overdraft		14,584		14,855
Deferred revenue		370,380		355,203
Accrued liabilities		507,259		521,428
Current portion of operating lease liabilities		36,430		32,533
Current portion of contingent consideration		96,931		94,996
Current portion of long-term debt and notes payable		16,096		26,462
Total current liabilities		1,631,541		1,687,932
Long-term portion of debt and notes payable		7,795,191		6,724,771
Long-term portion of operating lease liabilities		249,419		238,440
Long-term portion of contingent consideration		20,802		20,034
Deferred income taxes		1,052,508		1,022,480
Other long-term liabilities		542,239		524,438
Total liabilities		11,291,700		10,218,095
Commitments and contingencies (Note 17)
Equity:
Common shares: 258,019,417 shares issued and 257,961,725 shares outstanding at March 31, 2024; 257,659,921 shares issued and 257,600,479 shares outstanding at December 31, 2023		3,279,130		3,276,661
Additional paid-in capital		272,450		284,284
Accumulated other comprehensive loss		(62,836)		(9,826)
Treasury shares: 57,692 and 59,442 shares at March 31, 2024 and December 31, 2023, respectively		—		—
Retained earnings		4,298,171		4,141,690
Total Waste Connections’ equity		7,786,915		7,692,809
Noncontrolling interest in subsidiaries		4,045		4,972
Total equity		7,790,960		7,697,781
Total liabilities and equity	$	19,082,660	$	17,915,876

The accompanying notes are an integral part of these condensed consolidated financial statements.

1

WASTE CONNECTIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF NET INCOME

(Unaudited)

(In thousands of U.S. dollars, except share and per share amounts)

	Three Months Ended March 31,
	2024		2023
Revenues	$	2,072,653	$	1,900,503
Operating expenses:
Cost of operations		1,221,783		1,146,941
Selling, general and administrative		220,735		193,667
Depreciation		222,691		204,059
Amortization of intangibles		40,290		39,282
Impairments and other operating items		354		1,865
Operating income		366,800		314,689
Interest expense		(78,488)		(68,353)
Interest income		2,051		2,715
Other income (expense), net		(1,823)		3,174
Income before income tax provision		288,540		252,225
Income tax provision		(59,413)		(54,389)
Net income		229,127		197,836
Plus (less): Net loss (income) attributable to noncontrolling interests		927		(23)
Net income attributable to Waste Connections	$	230,054	$	197,813
Earnings per common share attributable to Waste Connections’ common shareholders:
Basic	$	0.89	$	0.77
Diluted	$	0.89	$	0.77
Shares used in the per share calculations:
Basic		257,801,116		257,372,942
Diluted		258,482,473		257,988,971
Cash dividends per common share	$	0.285	$	0.255

The accompanying notes are an integral part of these condensed consolidated financial statements.

2

WASTE CONNECTIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited)

(In thousands of U.S. dollars)

	Three Months Ended March 31,
	2024		2023
Net income	$	229,127	$	197,836
Other comprehensive income (loss), before tax:
Interest rate swap amounts reclassified into interest expense		(5,385)		(4,080)
Changes in fair value of interest rate swaps		9,972		(3,299)
Foreign currency translation adjustment		(56,381)		1,682
Other comprehensive income (loss), before tax		(51,794)		(5,697)
Income tax expense (benefit) related to items of other comprehensive income (loss)		(1,216)		1,955
Other comprehensive income (loss), net of tax		(53,010)		(3,742)
Comprehensive income		176,117		194,094
Plus (less): Comprehensive loss (income) attributable to noncontrolling interests		927		(23)
Comprehensive income attributable to Waste Connections	$	177,044	$	194,071

The accompanying notes are an integral part of these condensed consolidated financial statements.

3

WASTE CONNECTIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY

(Unaudited)

(In thousands of U.S. dollars, except share amounts)

	WASTE CONNECTIONS' EQUITY
						ACCUMULATED
				ADDITIONAL		OTHER
	COMMON SHARES			PAID-IN		COMPREHENSIVE		TREASURY SHARES			RETAINED		NONCONTROLLING
	SHARES	AMOUNT		CAPITAL		INCOME (LOSS)		SHARES	AMOUNT		EARNINGS		INTERESTS		TOTAL
Balances at December 31, 2023	257,600,479	$	3,276,661	$	284,284	$	(9,826)	59,442	$	—	$	4,141,690	$	4,972	$	7,697,781
Sale of common shares held in trust	1,750		286		—		—	(1,750)		—		—		—		286
Vesting of restricted share units	329,996		—		—		—	—		—		—		—		—
Vesting of performance-based restricted share units	153,555		—		—		—	—		—		—		—		—
Restricted share units released from deferred compensation plan	19,149		—		—		—	—		—		—		—		—
Tax withholdings related to net share settlements of equity-based compensation	(256,512)		—		(30,850)		—	—		—		—		—		(30,850)
Equity-based compensation	—		—		19,016		—	—		—		—		—		19,016
Exercise of warrants	97,901		—		—		—	—		—		—		—		—
Issuance of shares under employee share purchase plan	15,407		2,183		—		—	—		—		—		—		2,183
Cash dividends on common shares	—		—		—		—	—		—		(73,573)		—		(73,573)
Amounts reclassified into earnings, net of taxes	—		—		—		(3,958)	—		—		—		—		(3,958)
Changes in fair value of cash flow hedges, net of taxes	—		—		—		7,329	—		—		—		—		7,329
Foreign currency translation adjustment	—		—		—		(56,381)	—		—		—		—		(56,381)
Net income (loss)	—		—		—		—	—		—		230,054		(927)		229,127
Balances at March 31, 2024	257,961,725	$	3,279,130	$	272,450	$	(62,836)	57,692	$	—	$	4,298,171	$	4,045	$	7,790,960

The accompanying notes are an integral part of these condensed consolidated financial statements.

4

WASTE CONNECTIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY

(Unaudited)

(In thousands of U.S. dollars, except share amounts)

	WASTE CONNECTIONS' EQUITY
						ACCUMULATED
				ADDITIONAL		OTHER
	COMMON SHARES			PAID-IN		COMPREHENSIVE		TREASURY SHARES			RETAINED		NONCONTROLLING
	SHARES	AMOUNT		CAPITAL		INCOME (LOSS)		SHARES	AMOUNT		EARNINGS		INTERESTS		TOTAL
Balances at December 31, 2022	257,145,716	$	3,271,958	$	244,076	$	(56,830)	65,459	$	—	$	3,649,494	$	4,946	$	7,113,644
Sale of common shares held in trust	5,803		765		—		—	(5,803)		—		—		—		765
Vesting of restricted share units	325,490		—		—		—	—		—		—		—		—
Vesting of performance-based restricted share units	140,498		—		—		—	—		—		—		—		—
Restricted share units released from deferred compensation plan	19,151		—		—		—	—		—		—		—		—
Tax withholdings related to net share settlements of equity-based compensation	(176,837)		—		(22,966)		—	—		—		—		—		(22,966)
Equity-based compensation	—		—		17,374		—	—		—		—		—		17,374
Exercise of warrants	13,019		—		—		—	—		—		—		—		—
Issuance of shares under employee share purchase plan	14,594		1,841		—		—	—		—		—		—		1,841
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
Balances at March 31, 2023	257,487,434	$	3,274,564	$	238,484	$	(60,572)	59,656	$	—	$	3,781,519	$	4,969	$	7,238,964

The accompanying notes are an integral part of these condensed consolidated financial statements.

5

WASTE CONNECTIONS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

(In thousands of U.S. dollars)

	Three Months Ended March 31,
	2024		2023
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	229,127	$	197,836
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on disposal of assets and impairments		1,649		1,910
Depreciation		222,691		204,059
Amortization of intangibles		40,290		39,282
Deferred income taxes, net of acquisitions		30,395		28,229
Current period provision for expected credit losses		3,730		2,247
Amortization of debt issuance costs		4,055		1,621
Share-based compensation		21,952		18,469
Interest accretion		11,279		4,884
Adjustments to contingent consideration		—		(637)
Other		902		(2,937)
Net change in operating assets and liabilities, net of acquisitions		(75,761)		(52,605)
Net cash provided by operating activities		490,309		442,358
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments for acquisitions, net of cash acquired		(1,156,422)		(144,611)
Capital expenditures for property and equipment		(169,951)		(175,786)
Proceeds from disposal of assets		1,085		1,260
Other		(9,291)		1,378
Net cash used in investing activities		(1,334,579)		(317,759)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from long-term debt		2,353,022		336,649
Principal payments on notes payable and long-term debt		(1,350,932)		(320,027)
Payment of contingent consideration recorded at acquisition date		(11,295)		(1,319)
Change in book overdraft		(271)		5,421
Payments for cash dividends		(73,573)		(65,788)
Tax withholdings related to net share settlements of equity-based compensation		(30,850)		(22,966)
Debt issuance costs		(10,093)		—
Proceeds from issuance of shares under employee share purchase plan		2,183		1,841
Proceeds from sale of common shares held in trust		286		765
Net cash provided by (used in) financing activities		878,477		(65,424)
Effect of exchange rate changes on cash, cash equivalents and restricted cash		(577)		(54)
Net increase in cash, cash equivalents and restricted cash		33,630		59,121
Cash, cash equivalents and restricted cash at beginning of period		184,038		181,364
Cash, cash equivalents and restricted cash at end of period	$	217,668	$	240,485
Non-cash financing activities:
Liabilities assumed and notes payable issued to sellers of businesses acquired	$	149,634	$	34,224

The accompanying notes are an integral part of these condensed consolidated financial statements.

6

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

1.BASIS OF PRESENTATION AND SUMMARY

The accompanying condensed consolidated financial statements relate to Waste Connections, Inc. and its subsidiaries (the “Company”) for the three month periods ended March 31, 2024 and 2023. 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, 2023.

2.REPORTING CURRENCY

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.

3.NEW ACCOUNTING STANDARDS

Accounting Standards Pending Adoption

Disclosure of Significant Segment Expenses and Other Segment Items.  In November 2023, the Financial Accounting Standards Board (the “FASB”) amended its existing guidance for segment reporting to require a public entity to disclose significant segment expenses and other segment items on an annual and interim basis and to provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually.  The amended guidance does not change how a public entity identifies its operating segments, aggregates them or applies the quantitative thresholds to determine its reportable segments.  The guidance is applied retrospectively to all periods presented in financial statements, unless it is impracticable.  The guidance applies to all public entities and is effective for fiscal years beginning after December 15, 2023, and for interim periods beginning after December 15, 2024.  Early adoption is permitted.  The Company does not expect the adoption of this guidance to have a material impact on its consolidated financial statements.

Additional Income Tax Disclosures.  In December 2023, the FASB issued a final standard on improvements to income tax disclosures.  The standard requires public business entities to disclose in their rate reconciliation table additional categories of information about federal, state and foreign income taxes and to provide more details about the reconciling items in some categories if the items meet a quantitative threshold.  The guidance also requires all entities to disclose

7

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

annually income taxes paid (net of refunds received) disaggregated by federal (national), state and foreign taxes and to disaggregate the information by jurisdiction based on a quantitative threshold.  The standard applies to all entities subject to income taxes.  For public business entities, the new requirements will be effective for annual periods beginning after December 15, 2024.  The guidance will be applied on a prospective basis with the option to apply the standard retrospectively.  Early adoption is permitted.  The Company does not expect the adoption of this guidance to have a material impact on its consolidated financial statements.

4.REVENUE

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 March 31,
	2024		2023
Commercial	$	642,859	$	602,279
Residential		546,211		514,053
Industrial and construction roll off		325,990		318,315
Total collection		1,515,060		1,434,647
Landfill		353,478		343,433
Transfer		301,882		273,521
Recycling		49,025		31,301
E&P		97,408		51,759
Intermodal and other		49,541		38,212
Intercompany		(293,741)		(272,370)
Total	$	2,072,653	$	1,900,503

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 December 31, 2023 was recognized as revenue during the three months ended March 31, 2024 when the service was performed.

See Note 10 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 to five years. The Company recognizes the incremental costs of obtaining a contract as an expense when incurred if the amortization period of the asset that the Company would have recognized is one year or less. The Company had $26,102 and $25,977 of deferred sales incentives at March 31, 2024 and December 31, 2023, respectively.

8

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

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:

	Three Months Ended March 31,
	2024		2023
Beginning balance	$	23,553	$	22,939
Current period provision for expected credit losses		3,730		2,247
Write-offs charged against the allowance		(5,728)		(5,017)
Recoveries collected		1,356		2,068
Impact of changes in foreign currency		(53)		2
Ending balance	$	22,858	$	22,239

6.LANDFILL ACCOUNTING

At March 31, 2024, the Company’s landfills consisted of 100 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 $3,297,752 at March 31, 2024. 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.

9

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

Based on remaining permitted capacity as of March 31, 2024, 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 32 years.  As of March 31, 2024, 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 35 years.  The estimated remaining lives of the Company’s owned landfills and landfills operated under life-of-site operating agreements range from two to 382 years, with approximately 90% of the projected annual disposal volume from landfills with remaining lives of less than 70 years.

During the three months ended March 31, 2024 and 2023, the Company expensed $62,525 and $59,055, respectively, or an average of $5.29 and $5.06 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 2024 and 2023 “layers” for final capping, closure and post-closure obligations was 5.50% for both periods. The Company’s long-term inflation rate assumption is 2.75% for each of the years ending December 31, 2024 and 2023. 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 three months ended March 31, 2024 and 2023, the Company expensed $9,356 and $4,474, respectively, or an average of $0.78 and $0.38 per ton consumed, respectively, related to final capping, closure and post-closure accretion expense. In the event that changes in an estimate for a closure and post-closure liability are associated with a significant change in facts and circumstances at a landfill or a non-operating section of a landfill, corresponding adjustments to recorded liabilities and Impairments and other operating items are made as soon as is practical.

The following is a reconciliation of the Company’s final capping, closure and post-closure liability balance from December 31, 2023 to March 31, 2024:

Final capping, closure and post-closure liability at December 31, 2023	$	522,233
Liability adjustments		(8,726)
Accretion expense associated with landfill obligations		9,356
Closure payments		(28,950)
Assumption of closure liabilities from acquisitions		48,220
Foreign currency translation adjustment		(829)
Final capping, closure and post-closure liability at March 31, 2024	$	541,304

10

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

Liability adjustments of $8,726 for the three months ended March 31, 2024, 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.  In the event that changes in an estimate for a closure and post-closure liability are associated with a significant change in facts and circumstances at a landfill or a non-operating section of a landfill, corresponding adjustments to recorded liabilities and Impairments and other operating items are made as soon as is practical.

At March 31, 2024 and December 31, 2023, $7,655 and $12,381, respectively, of the Company’s restricted cash balance and $63,697 and $59,551, respectively, of the Company’s restricted investments balance was for purposes of securing its performance of future final capping, closure and post-closure obligations.

7.ACQUISITIONS

The Company acquired nine individually immaterial non-hazardous solid waste collection, transfer, recycling and disposal businesses and one E&P waste treatment and disposal business during the three months ended March 31, 2024.  The total transaction-related expenses incurred during the three months ended March 31, 2024 for these acquisitions were $9,847. These expenses are included in Selling, general and administrative expenses in the Company’s Condensed Consolidated Statements of Net Income.

The Company acquired four individually immaterial non-hazardous solid waste collection, transfer, recycling and disposal businesses during the three months ended March 31, 2023.  The total transaction-related expenses incurred during the three months ended March 31, 2023 for these acquisitions were $2,081. 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.

11

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

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 three months ended March 31, 2024 and 2023:

	2024		2023
	Acquisitions		Acquisitions
Fair value of consideration transferred:
Cash	$	1,156,422	$	144,611
Debt assumed		64,450		17,097
		1,220,872		161,708
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts receivable		51,852		3,882
Prepaid expenses and other current assets		9,951		2,290
Restricted investments		—		5,462
Operating lease right-of-use assets		2,317		587
Property and equipment		688,906		67,201
Long-term franchise agreements and contracts		77,384		58,630
Customer lists		102,418		1,527
Permits and other intangibles		136,868		2,403
Other assets		1,617		—
Accounts payable and accrued liabilities		(4,727)		(4,159)
Current portion of operating lease liabilities		(1,515)		(53)
Deferred revenue		(11,886)		(761)
Contingent consideration		(12,012)		(6,000)
Long-term portion of operating lease liabilities		(3,857)		(534)
Other long-term liabilities		(51,187)		(4,543)
Deferred income taxes		—		(1,077)
Total identifiable net assets		986,129		124,855
Goodwill	$	234,743	$	36,853

Goodwill acquired during the three months ended March 31, 2024 and 2023, totaling $234,743 and $36,853, respectively, is expected to be deductible for tax purposes. The fair value of acquired working capital related to nine individually immaterial acquisitions completed during the twelve months ended March 31, 2024, 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 nine acquisitions are not expected to be material to the Company’s financial position. The adjustments recorded during the three months ended March 31, 2024 relating to finalizing the acquired working capital for the individually immaterial acquisitions completed during the twelve months ended March 31, 2024 were not material to the Company’s financial position.

The gross amount of trade receivables due under contracts acquired during the three months ended March 31, 2024, was $52,335, of which $483 was expected to be uncollectible. The gross amount of trade receivables due under contracts acquired during the three months ended March 31, 2023, was $4,164, of which $282 was expected to be uncollectible. The Company did not acquire any other class of receivable as a result of the acquisition of these businesses.

12

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

8.INTANGIBLE ASSETS, NET

Intangible assets, exclusive of goodwill, consisted of the following at March 31, 2024:

	Gross				Accumulated		Net
	Carrying		Accumulated		Impairment		Carrying
	Amount		Amortization		Loss		Amount
Finite-lived intangible assets:
Long-term franchise agreements and contracts	$	1,035,243	$	(359,900)	$	—	$	675,343
Customer lists		905,627		(619,901)		—		285,726
Permits and other		919,818		(144,490)		(40,784)		734,544
		2,860,688		(1,124,291)		(40,784)		1,695,613
Indefinite-lived intangible assets:
Solid waste collection and transportation permits		181,613		—		—		181,613
Intangible assets, exclusive of goodwill	$	3,042,301	$	(1,124,291)	$	(40,784)	$	1,877,226

The weighted-average amortization period of long-term franchise agreements and contracts acquired during the three months ended March 31, 2024 was 12.1 years. The weighted-average amortization period of customer lists acquired during the three months ended March 31, 2024 was 10.1 years.  The weighted-average amortization period of finite-lived permits and other acquired during the three months ended March 31, 2024 was 40.0 years.

Intangible assets, exclusive of goodwill, consisted of the following at December 31, 2023:

	Gross				Accumulated		Net
	Carrying		Accumulated		Impairment		Carrying
	Amount		Amortization		Loss		Amount
Finite-lived intangible assets:
Long-term franchise agreements and contracts	$	960,033	$	(343,099)	$	—	$	616,934
Customer lists		806,257		(606,192)		—		200,065
Permits and other		784,905		(139,192)		(40,784)		604,929
		2,551,195		(1,088,483)		(40,784)		1,421,928
Indefinite-lived intangible assets:
Solid waste collection and transportation permits		181,613		—		—		181,613
Intangible assets, exclusive of goodwill	$	2,732,808	$	(1,088,483)	$	(40,784)	$	1,603,541

Estimated future amortization expense for the next five years relating to finite-lived intangible assets owned as of March 31, 2024 is as follows:

For the year ending December 31, 2024	$	172,784
For the year ending December 31, 2025	$	155,871
For the year ending December 31, 2026	$	136,081
For the year ending December 31, 2027	$	118,791
For the year ending December 31, 2028	$	105,796

13

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

9.LONG-TERM DEBT

The following table presents the Company’s long-term debt at March 31, 2024 and December 31, 2023:

	March 31,		December 31,
	2024		2023
Revolving Credit Agreement, bearing interest ranging from 6.30% to 6.43% (a)	$	2,237,794	$	—
Revolver under 2021 Revolving and Term Credit Agreement, bearing interest ranging from 6.40% to 8.50% (b)		—		453,245
Term loan under 2021 Revolving and Term Credit Agreement, bearing interest at 6.50% (b)		—		650,000
Term loan under 2022 Term Loan Agreement, bearing interest at 6.44% (b)		—		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
5.00% Senior Notes due 2034		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 2028 to 2036 (a)		37,124		48,774
Finance leases, bearing interest ranging from 1.89% to 5.07%, with lease expiration dates ranging from 2026 to 2029 (a)		9,292		10,034
		7,884,210		6,812,053
Less – current portion		(16,096)		(26,462)
Less – unamortized debt discount and issuance costs		(72,923)		(60,820)
Long-term portion of debt and notes payable	$	7,795,191	$	6,724,771

____________________

(a) Interest rates represent the interest rates at March 31, 2024.

(b) Interest rates represent the interest rates at December 31, 2023.

2021 Revolving Credit and Term Loan Agreement

 On February 27, 2024, the Company used a portion of the proceeds from borrowings under the Revolving Credit Agreement (as defined and described below) to (i) prepay the amounts outstanding under that certain Second Amended and Restated Revolving Credit and Term Loan Agreement, dated as of July 30, 2021 (as amended, restated, supplemented or otherwise modified from time to time, the “2021 Revolving and Term Credit Agreement”), among the Company, as borrower, Bank of America, N.A., acting through its Canada Branch, as the global agent, the swing line lender and a letter of credit issuer, Bank of America, N.A., as the U.S. agent and a letter of credit issuer, and the lenders and any other financial institutions from time to time party thereto and (ii) terminate the 2021 Revolving and Term Credit Agreement and the loan documents associated therewith.

2022 Term Loan Agreement

On February 27, 2024, the Company used a portion of the proceeds from borrowings under the Revolving Credit Agreement to (i) prepay the amounts outstanding under that certain Term Loan Agreement, dated as of October 31, 2022

14

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

(as amended, restated, supplemented or otherwise modified from time to time, the “2022 Term Loan Agreement”), among the Company, as borrower, Bank of America, N.A., as administrative agent, and the lenders and any other financial institutions from time to time party thereto and (ii) terminate the 2022 Term Loan Agreement and the loan documents associated therewith.

Revolving Credit Agreement

On February 27, 2024, the Company, as borrower, Bank of America, N.A., acting through its Canada Branch, as the global agent, the swing line lender, and a letter of credit issuer, Bank of America, N.A., as the U.S. agent and a letter of credit issuer, and the other lenders from time to time party thereto (the “Lenders”) entered into that certain Revolving Credit Agreement (as amended, restated, supplemented or otherwise modified from time to time, the “Revolving Credit Agreement”), pursuant to which the Lenders made loans and other credit extensions to the Company under a revolving credit facility.

Details of the Revolving Credit Agreement at March 31, 2024 and details of the 2021 Revolving and Term Credit Agreement at December 31, 2023 are as follows:

	March 31,			December 31,
	2024			2023
Revolver
Available	$	723,386		$	1,357,013
Letters of credit outstanding	$	38,820		$	39,742
Total amount drawn, as follows:	$	2,237,794		$	453,245
Amount drawn – U.S. Term SOFR rate loan	$	1,150,000		$	90,000
Interest rate applicable – U.S. Term SOFR rate loan		6.43	%		6.46	%
Amount drawn – U.S. Term SOFR rate loan	$	45,000		$	150,000
Interest rate applicable – U.S. Term SOFR rate loan		6.43	%		6.50	%
Amount drawn – U.S. base rate loan	$	—		$	28,000
Interest rate applicable – U.S. base rate loan		—	%		8.50	%
Amount drawn – Canadian Term CORRA loan	$	987,444		$	—
Interest rate applicable - Canadian term CORRA loan		6.30	%		—	%
Amount drawn – Canadian Term CORRA loan	$	55,350		$	—
Interest rate applicable - Canadian term CORRA loan		6.31	%		—	%
Amount drawn – Canadian prime rate loan	$	—		$	15,122
Interest rate applicable - Canadian prime rate loan		—	%		7.20	%
Amount drawn – Canadian bankers’ acceptance	$	—		$	153,111
Interest rate applicable – Canadian bankers’ acceptance		—	%		6.46	%
Amount drawn – Canadian bankers’ acceptance	$	—		$	17,012
Interest rate applicable – Canadian bankers’ acceptance		—	%		6.40	%
Commitment – rate applicable		0.09	%		0.09	%
Term loan
Amount drawn – U.S. Term SOFR rate loan	$	—		$	650,000
Interest rate applicable – U.S. Term SOFR rate loan		—	%		6.50	%

In addition to the $38,820 of letters of credit at March 31, 2024 issued and outstanding under the Revolving Credit Agreement, the Company has issued and outstanding letters of credit totaling $102,960 under facilities other than the Revolving Credit Agreement.

15

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

Pursuant to the terms and conditions of the Revolving Credit Agreement, the Lenders committed to provide the revolving credit facility as set forth above. The Revolving Credit Agreement (i) has a scheduled maturity date of February 27, 2029 (subject to certain extension mechanics therein by which the Company may request two additional one-year maturity date extensions), (ii) provides for revolving advances up to an aggregate principal amount of $3,000,000 at any one time outstanding (subject to satisfaction of certain conditions at the time advances are made) and (iii) provides for, at the Company’s discretion, flexibility for an uncommitted upsize of the aggregate principal amount by up to $1,000,000 (to an aggregate principal amount of up to $4,000,000). The Revolving Credit Agreement provides for letters of credit in an aggregate amount not to exceed $320,000 and swing line loans in an aggregate amount not to exceed $100,000, in each case, to be issued at the request of the Company subject to the terms therein and with such sublimits included in the aggregate commitments of the credit facility.

Advances are available under the Revolving Credit Agreement in U.S. dollars and Canadian dollars. Interest accrues on revolving advances, at the Company’s option, (i) at a term rate based on the Secured Overnight Financing Rate as administered by the Federal Reserve Bank of New York (or a successor administrator thereof) (“term SOFR”) or a base rate for U.S. dollar borrowings, plus an applicable margin, and (ii) at a term rate based on the Canadian Overnight Repo Rate Average as administered and published by the Bank of Canada (or a successor administrator thereof) (“term CORRA”) or at the Canadian prime rate for Canadian dollar borrowings, plus an applicable margin. Interest for term SOFR loans has a credit spread adjustment of 0.10% for all applicable interest periods and interest for term CORRA loans has a credit spread adjustment of 0.29547% for an interest period of one month’s duration and 0.32138% for an interest period of three months’ duration. Fees for letters of credit in U.S. dollars and Canadian dollars are also based on the applicable margin. The applicable margin used in connection with interest rates and fees is based on the debt rating of the Company’s public non-credit-enhanced, senior unsecured long-term debt (the “Debt Rating”). The applicable margin for term SOFR loans, term CORRA loans and letter of credit fees ranges from 0.750% to 1.250%, and the applicable margin for U.S. base rate loans, Canadian prime rate loans and swing line loans ranges from 0.00% to 0.250%. The Company will also pay a commitment fee based on the Debt Rating on the actual daily unused amount of the aggregate revolving commitments ranging from 0.065% to 0.150%.

Borrowings under the Revolving Credit Agreement are unsecured and there are no subsidiary guarantors under the Revolving Credit Agreement. The Revolving Credit Agreement contains customary representations, warranties, covenants and events of default, including, among others, a change of control event of default and limitations on the incurrence of indebtedness and liens, new lines of business, mergers, transactions with affiliates and burdensome agreements. During the continuance of an event of default, the Lenders may take a number of actions, including, among others, declaring the entire amount then outstanding under the Revolving Credit Agreement to be due and payable.

The Revolving Credit Agreement includes a financial covenant limiting, as of the last day of each fiscal quarter, the ratio of (a) Consolidated Total Funded Debt (as defined in the Revolving Credit Agreement) as of such date to (b) Consolidated EBITDA (as defined in the Revolving Credit Agreement), measured for the preceding 12 months, to not more than 3.75 to 1.00 (or 4.25 to 1.00 during material acquisition periods, subject to certain limitations). As of March 31, 2024, the Company was in compliance with all applicable covenants in the Revolving Credit Agreement.

Senior Notes

On February 21, 2024, the Company completed an underwritten public offering (the “Offering”) of $750,000 aggregate principal amount of its 5.00% Senior Notes due 2034 (the “2034 Senior Notes”). The Company issued the 2034 Senior Notes under the Indenture, dated as of November 16, 2018 (the “Base Indenture”), by and between the Company and U.S. Bank Trust Company, National Association, as successor in interest to U.S. Bank National Association, as trustee (the “Trustee”), as supplemented by the Eighth Supplemental Indenture, dated as of February 21, 2024 (the “Supplemental Indenture” and the Base Indenture as so supplemented, the “Indenture”).

16

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

The Company will pay interest on the 2034 Senior Notes on March 1 and September 1 of each year, beginning September 1, 2024, and the 2034 Senior Notes will mature on March 1, 2034. The 2034 Senior Notes are the Company’s senior unsecured obligations, ranking equally in right of payment with its other existing and future unsubordinated debt and senior to any of its future subordinated debt. The 2034 Senior Notes will not be guaranteed by any of the Company’s subsidiaries.

The Company may, prior to December 1, 2033 (three months before the maturity date) (the “Par Call Date”), redeem some or all of the 2034 Senior Notes, at any time and from time to time, at a redemption price equal to the greater of 100% of the principal amount of the 2034 Senior Notes redeemed, or the sum of the present values of the remaining scheduled payments of principal and interest on the 2034 Senior Notes redeemed discounted to the redemption date (assuming the 2034 Senior Notes matured on the Par Call Date), plus, in either case, accrued and unpaid interest thereon to the redemption date. Commencing on December 1, 2033 (three months before the maturity date), the Company may redeem some or all of the 2034 Senior Notes, at any time and from time to time, at a redemption price equal to the principal amount of the 2034 Senior Notes being redeemed plus accrued and unpaid interest thereon to the redemption date.

Under certain circumstances, the Company may become obligated to pay additional amounts (the “Additional Amounts”) with respect to the 2034 Senior Notes to ensure that the net amounts received by each holder of the 2034 Senior Notes will not be less than the amount such holder would have received if withholding taxes or deductions were not incurred on a payment under or with respect to the 2034 Senior Notes. If such payment of Additional Amounts are a result of a change in the laws or regulations, including a change in any official position, the introduction of an official position or a holding by a court of competent jurisdiction, of any jurisdiction from or through which payment is made by or on behalf of the 2034 Senior Notes having power to tax, and the Company cannot avoid such payments of Additional Amounts through reasonable measures, then the Company may redeem the 2034 Senior Notes then outstanding at a redemption price equal to 100% of the principal amount thereof, plus accrued and unpaid interest, if any, to, but excluding, the redemption date (subject to the right of holders of record on the relevant record date to receive interest due on an interest payment date that is on or prior to the redemption date).

If the Company experiences certain kinds of changes of control, each holder of the 2034 Senior Notes may require the Company to purchase all or a portion of the 2034 Senior Notes for cash at a price equal to 101% of the aggregate principal amount of such 2034 Senior Notes, plus accrued and unpaid interest, if any, to, but excluding, the purchase date.

The covenants in the Indenture include limitations on liens, sale-leaseback transactions and mergers and sales of all or substantially all of the Company’s assets. The Indenture also includes customary events of default with respect to the 2034 Senior Notes.

 Upon an Event of Default, the principal of and accrued and unpaid interest on all the 2034 Senior Notes may be declared to be due and payable by the Trustee or the holders of not less than 25% in principal amount of the outstanding 2034 Senior Notes. Upon such a declaration, such principal and accrued interest on all of the 2034 Senior Notes will be due and payable immediately. In the case of an Event of Default resulting from certain events of bankruptcy, insolvency or reorganization, the principal (or such specified amount) of and accrued and unpaid interest, if any, on all outstanding 2034 Senior Notes will become and be immediately due and payable without any declaration or other act on the part of the Trustee or any holder of the 2034 Senior Notes. Under certain circumstances, the holders of a majority in principal amount of the outstanding 2034 Senior Notes may rescind any such acceleration with respect to the 2034 Senior Notes and its consequences.

17

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

10.SEGMENT REPORTING

The Company’s revenues are generated primarily 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.

For the three months ended March 31, 2024, the Company managed its operations through the following six geographic solid waste operating segments: Western, Southern, Central, Eastern, Canada and MidSouth.  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.  Certain corporate or regional overhead expense allocations may affect comparability of the segment information presented herein on a period-over-period basis.

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 10.

Summarized financial information concerning the Company’s reportable segments for the three months ended March 31, 2024 and 2023, is shown in the following tables:

Three Months Ended			Intercompany		Reported		Segment
March 31, 2024	Revenue		Revenue(b)		Revenue		EBITDA(c)
Western	$	476,703	$	(54,454)	$	422,249	$	113,050
Southern		473,953		(55,007)		418,946		128,412
Central		403,086		(42,159)		360,927		125,922
Eastern		431,969		(71,906)		360,063		95,016
Canada		307,346		(26,984)		280,362		121,361
MidSouth		273,337		(43,231)		230,106		57,507
Corporate(a)		—		—		—		(11,133)
	$	2,366,394	$	(293,741)	$	2,072,653	$	630,135

18

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

Three Months Ended			Intercompany		Reported		Segment
March 31, 2023	Revenue		Revenue(b)		Revenue		EBITDA(c)
Western	$	444,796	$	(48,957)	$	395,839	$	110,689
Southern		451,000		(51,107)		399,893		121,914
Central		383,525		(43,540)		339,985		115,756
Eastern		388,797		(59,669)		329,128		73,275
Canada		253,670		(26,514)		227,156		82,984
MidSouth		251,085		(42,583)		208,502		57,731
Corporate(a)		—		—		—		(2,454)
	$	2,172,873	$	(272,370)	$	1,900,503	$	559,895

____________________

(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 generally 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 March 31, 2024 and December 31, 2023, were as follows:

	March 31,		December 31,
	2024		2023
Western	$	3,434,367	$	3,432,529
Southern		3,500,113		3,501,953
Central		2,793,648		2,811,016
Eastern		3,281,517		3,228,244
Canada		3,625,769		2,794,795
MidSouth		1,991,424		1,705,180
Corporate		455,822		442,159
Total Assets	$	19,082,660	$	17,915,876

The following tables show changes in goodwill during the three months ended March 31, 2024 and 2023, by reportable segment:

	Western		Southern		Central		Eastern		Canada		MidSouth		Total
Balance as of December 31, 2023	$	779,455	$	1,559,703	$	1,008,500	$	1,587,491	$	1,723,068	$	746,183	$	7,404,400
Goodwill acquired		5,653		1,322		—		37,289		91,389		98,665		234,318
Goodwill acquisition adjustments		—		—		425		—		—		—		425
Impact of changes in foreign currency		—		—		—		—		(41,968)		—		(41,968)
Balance as of March 31, 2024	$	785,108	$	1,561,025	$	1,008,925	$	1,624,780	$	1,772,489	$	844,848	$	7,597,175

19

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

	Western		Southern		Central		Eastern		Canada		MidSouth		Total
Balance as of December 31, 2022	$	732,335	$	1,547,894	$	1,003,470	$	1,189,111	$	1,684,670	$	744,817	$	6,902,297
Goodwill acquired		30,703		—		397		3,440		—		3,249		37,789
Goodwill acquisition adjustments		—		(647)		—		—		(289)		—		(936)
Impact of changes in foreign currency		—		—		—		—		1,417		—		1,417
Balance as of March 31, 2023	$	763,038	$	1,547,247	$	1,003,867	$	1,192,551	$	1,685,798	$	748,066	$	6,940,567

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
	March 31,
	2024		2023
Western segment EBITDA	$	113,050	$	110,689
Southern segment EBITDA		128,412		121,914
Central segment EBITDA		125,922		115,756
Eastern segment EBITDA		95,016		73,275
Canada segment EBITDA		121,361		82,984
MidSouth segment EBITDA		57,507		57,731
Subtotal reportable segments		641,268		562,349
Unallocated corporate overhead		(11,133)		(2,454)
Depreciation		(222,691)		(204,059)
Amortization of intangibles		(40,290)		(39,282)
Impairments and other operating items		(354)		(1,865)
Interest expense		(78,488)		(68,353)
Interest income		2,051		2,715
Other income (expense), net		(1,823)		3,174
Income before income tax provision	$	288,540	$	252,225

11.DERIVATIVE FINANCIAL INSTRUMENTS

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 Revolving Credit Agreement. The Company’s strategy to achieve that objective involves entering into interest rate swaps. The interest rate swaps outstanding at March 31, 2024 were specifically designated to the Revolving Credit Agreement and accounted for as cash flow hedges.

20

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

At March 31, 2024, 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 March 31, 2024, 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)	$	18,500	Accrued liabilities	$	—
	Other assets, net		8,874
Total derivatives designated as cash flow hedges		$	27,374		$	—

____________________

(a)Represents the estimated amount of the existing unrealized gains on interest rate swaps at March 31, 2024 (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, 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	$	15,842	Accrued liabilities	$	—
	Other assets, net		6,945
Total derivatives designated as cash flow hedges		$	22,787		$	—

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 months ended March 31, 2024 and 2023:

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
	March 31,					March 31,
	2024		2023			2024		2023
Interest rate swaps	$	7,329	$	(2,425)	Interest expense	$	(3,958)	$	(2,999)

____________________

(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.

21

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

See Note 15 for further discussion on the impact of the Company’s hedge accounting to its consolidated comprehensive income (loss) and AOCIL.

12.FAIR VALUE OF FINANCIAL INSTRUMENTS

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 March 31, 2024 and December 31, 2023, 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 March 31, 2024 and December 31, 2023, 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 March 31, 2024 and December 31, 2023, are as follows:

	Carrying Value at				Fair Value (a) at
	March 31,		December 31,		March 31,		December 31,
	2024		2023		2024		2023
4.25% Senior Notes due 2028	$	500,000	$	500,000	$	488,300	$	496,800
3.50% Senior Notes due 2029	$	500,000	$	500,000	$	470,750	$	478,350
2.60% Senior Notes due 2030	$	600,000	$	600,000	$	532,020	$	539,460
2.20% Senior Notes due 2032	$	650,000	$	650,000	$	533,325	$	543,725
3.20% Senior Notes due 2032	$	500,000	$	500,000	$	439,100	$	450,200
4.20% Senior Notes due 2033	$	750,000	$	750,000	$	706,275	$	729,600
5.00% Senior Notes due 2034	$	750,000	$	—	$	741,975	$	—
3.05% Senior Notes due 2050	$	500,000	$	500,000	$	341,350	$	362,600
2.95% Senior Notes due 2052	$	850,000	$	850,000	$	568,990	$	601,460

____________________

(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 14.

22

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

13.NET INCOME PER SHARE INFORMATION

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 months ended March 31, 2024 and 2023:

	Three Months Ended
	March 31,
	2024		2023
Numerator:
Net income attributable to Waste Connections for basic and diluted earnings per share	$	230,054	$	197,813
Denominator:
Basic shares outstanding		257,801,116		257,372,942
Dilutive effect of equity-based awards		681,357		616,029
Diluted shares outstanding		258,482,473		257,988,971

14.FAIR VALUE MEASUREMENTS

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 March 31, 2024 and December 31, 2023, 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.

23

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

The Company’s assets and liabilities measured at fair value on a recurring basis at March 31, 2024 and December 31, 2023, were as follows:

	Fair Value Measurement at March 31, 2024 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	$	27,374	$	—	$	27,374	$	—
Restricted cash	$	103,773	$	103,773	$	—	$	—
Restricted investments	$	76,929	$	—	$	76,929	$	—
Contingent consideration	$	(117,733)	$	—	$	—	$	(117,733)

	Fair Value Measurement at December 31, 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	$	22,787	$	—	$	22,787	$	—
Restricted cash	$	105,639	$	105,639	$	—	$	—
Restricted investments	$	70,658	$	—	$	70,658	$	—
Contingent consideration	$	(115,030)	$	—	$	—	$	(115,030)

The following table summarizes the changes in the fair value for Level 3 liabilities related to contingent consideration for the three months ended March 31, 2024 and 2023:

	Three Months Ended March 31,
	2024		2023
Beginning balance	$	115,030	$	81,415
Contingent consideration recorded at acquisition date		12,012		6,000
Payment of contingent consideration recorded at acquisition date		(11,295)		(1,319)
Adjustments to contingent consideration		—		(637)
Interest accretion expense		1,986		363
Ending balance	$	117,733	$	85,822

15.OTHER COMPREHENSIVE INCOME (LOSS)

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 months ended March 31, 2024 and 2023 are as follows:

	Three Months Ended March 31, 2024
	Gross		Tax Effect		Net of Tax
Interest rate swap amounts reclassified into interest expense	$	(5,385)	$	1,427	$	(3,958)
Changes in fair value of interest rate swaps		9,972		(2,643)		7,329
Foreign currency translation adjustment		(56,381)		—		(56,381)
	$	(51,794)	$	(1,216)	$	(53,010)

24

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

	Three Months Ended March 31, 2023
	Gross		Tax Effect		Net of Tax
Interest rate swap amounts reclassified into interest expense	$	(4,080)	$	1,081	$	(2,999)
Changes in fair value of interest rate swaps		(3,299)		874		(2,425)
Foreign currency translation adjustment		1,682		—		1,682
	$	(5,697)	$	1,955	$	(3,742)

A rollforward of the amounts included in AOCIL, net of taxes, for the three months ended March 31, 2024 and 2023, is as follows:

			Foreign		Accumulated
			Currency		Other
	Interest		Translation		Comprehensive
	Rate Swaps		Adjustment		Income (Loss)
Balance at December 31, 2023	$	16,749	$	(26,575)	$	(9,826)
Amounts reclassified into earnings		(3,958)		—		(3,958)
Changes in fair value		7,329		—		7,329
Foreign currency translation adjustment		—		(56,381)		(56,381)
Balance at March 31, 2024	$	20,120	$	(82,956)	$	(62,836)

			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		(2,999)		—		(2,999)
Changes in fair value		(2,425)		—		(2,425)
Foreign currency translation adjustment		—		1,682		1,682
Balance at March 31, 2023	$	17,954	$	(78,526)	$	(60,572)

See Note 11 for further discussion on the Company’s derivative instruments.

16.SHAREHOLDERS’ EQUITY

Share-Based Compensation

Restricted Share Units

A summary of activity related to restricted share units (“RSUs”) during the three-month period ended March 31, 2024, is presented below:

	Unvested Shares
Outstanding at December 31, 2023	936,267
Granted	361,108
Forfeited	(16,114)
Vested and issued	(329,996)
Outstanding at March 31, 2024	951,265

25

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

The weighted average grant-date fair value per share for the common shares underlying the RSUs granted during the three-month period ended March 31, 2024 was $164.63.

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 March 31, 2024 and 2023, the Company had 29,980 and 62,201 vested deferred RSUs outstanding, respectively.

Performance-Based Restricted Share Units

A summary of activity related to performance-based restricted share units (“PSUs”) during the three-month period ended March 31, 2024, is presented below:

	Unvested Shares
Outstanding at December 31, 2023	259,532
Granted	113,166
Vested and issued	(153,555)
Outstanding at March 31, 2024	219,143

During the three months ended March 31, 2024, 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, 2026. 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 three-month period ended March 31, 2024 was $138.29.

Deferred Share Units

A summary of activity related to deferred share units (“DSUs”) during the three-month period ended March 31, 2024, is presented below:

	Vested Shares
Outstanding at December 31, 2023	30,481
Granted	3,363
Outstanding at March 31, 2024	33,844

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 three-month period ended March 31, 2024 was $167.56.

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

26

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

vesting or other distribution events. A summary of activity related to Progressive Waste RSUs during the three-month period ended March 31, 2024, is presented below:

Outstanding at December 31, 2023	51,812
Cash settled	(1,750)
Outstanding at March 31, 2024	50,062

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.

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 15,407 of the Company’s common shares for $2,183 during the three months ended March 31, 2024.  Under the ESPP, employees purchased 14,594 of the Company’s common shares for $1,841 during the three months ended March 31, 2023.

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, any share buyback taxes applicable and overall market conditions. All common shares purchased under the NCIB shall be immediately cancelled following their repurchase.

27

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

For each of the three months ended March 31, 2024 and 2023, the Company did not repurchase any common shares pursuant to the NCIB in effect during that period.  As of March 31, 2024, the maximum number of shares available for repurchase under the current NCIB was 12,881,534.

Cash Dividend

In October 2023, the Company announced that its Board of Directors increased its regular quarterly cash dividend by $0.03, from $0.255 to $0.285 per Company common share. Cash dividends of $73,573 and $65,788 were paid during the three months ended March 31, 2024 and 2023, respectively.

17.COMMITMENTS AND CONTINGENCIES

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 March 31, 2024, 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). On December 19, 2023, 52 plaintiffs filed a mass action in the federal district court of the Eastern District of Louisiana, Areceneaux v. Louisiana Regional Landfill Company, et al. The complaint is substantially identical to the consolidated Addison action (which together with

28

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

Areceneaux now totals 593 plaintiffs), asserting the same causes of action against the same defendants, but was filed by a new law firm. The Company and Aptim were served on March 21, 2024.

The putative class actions and the Addison and Areceneaux mass actions assert claims for damages from odors allegedly emanating from the JP Landfill. The consolidated putative class action complaint alleges that the JP Landfill released “noxious odors” into the plaintiffs’ properties and the surrounding community and asserts a range of liability theories—nuisance, negligence (since dismissed), and strict liability—against all defendants. The putative class is described currently as Jefferson Parish residents suffering an injury as a result of exposure to odors from the Landfill, who live in a delineated area that expands roughly five miles from the Landfill in a northerly and easterly direction. The putative class plaintiffs propose that a class be certified on liability and allocation issues and that specific causation be left for individual determination. Following the completion of fact and expert discovery, the putative class plaintiffs will be able to file an amended motion for class certification. The putative class plaintiffs seek unspecified damages. The Addison and Areceneaux plaintiffs assert causes of action for nuisance, negligence, and (with respect to the Parish) unconstitutional takings under the Louisiana Constitution; on behalf of two plaintiffs, the Addison complaint also asserts causes of action for wrongful death and survivorship.

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 plaintiffs’ claims of diminution of property value were put on a separate track from these damages and not addressed.

After the general causation decision, the Court entered a case management order on April 17, 2023 that scheduled a trial of a subset of 13 Addison plaintiffs’ cases on the merits, prior to class certification being determined as to the putative class case. The Company objected to and opposed that sequence by motion, which the Court denied.

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. On August 24, 2023 the Fifth Circuit denied the Company’s petition for a writ of mandamus. Following the Fifth Circuit’s decision, 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 plaintiffs on August 12, 2024.

The Company has already obtained dismissal of approximately one third of the original Addison plaintiffs, and believes it has defenses to the merits of the Addison and Areceneaux actions, including specific causation issues due to other odor sources in the area. The Company also believes it has defenses to certification of the putative class actions. The Company is continuing to vigorously defend itself in these lawsuits; however, at this time, the Company is not able to determine the likelihood of any outcome regarding the underlying claims, including the allocation of any potential liability among the Company, the Parish, and Aptim Corporation.

29

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

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 2.5 million tons of materials for disposal and beneficial use in 2023.  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, and an addendum to CCL’s environmental impact report in accordance with the California Environmental Quality Act on January 12, 2024.  Upon completion of review by the County, the CUP modification application will be scheduled for a hearing before the Los Angeles County Regional Planning Commission. 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

30

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

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.

Elevated Temperature Landfill Event

In 2023, the Company’s subsidiary, Chiquita Canyon, LLC (“CCL”), began receiving notices of violation from regulatory agencies for odors and other impacts that CCL’s retained expert consultants in Elevated Temperature Landfill (“ETLF”) events have attributed to an ETLF event that is occurring in a lined, non-active area of the Chiquita Canyon Landfill (the “CC Landfill”).

Beginning in May 2023, CCL received notices of violation (“NOVs”) from the South Coast Air Quality Management District (“SCAQMD”) for alleged violations of Section 41700 of the California Health & Safety Code and SCAQMD Rule 402 based on complaints from the public of odors from the CC Landfill, which SCAQMD inspectors stated that they verified. Each Rule 402 NOV alleges the CC Landfill is “discharging such quantities of air contaminants to cause injury, detriment, nuisance or annoyance to a considerable number of persons.”

Since May 2023, CCL has received approximately 163 NOVs for alleged violations of SCAQMD Rule 402. CCL has also received seven additional NOVs from SCAQMD alleging violations of other SCAQMD rules and CCL’s Title V permit. The majority of these additional NOVs appear related to the increase in liquids and landfill gas caused by the ETLF event.

On August 15, 2023, SCAQMD petitioned its Hearing Board for an Order for Abatement in Hearing Board Case No. 6177-4 to address the Rule 402 NOVs issued by SCAQMD inspectors as a result of the ETLF event. SCAQMD and CCL negotiated a Stipulated Order for Abatement (the “Stipulated Order”), which was issued by the Hearing Board on September 6, 2023. Modifications to the Stipulated Order were approved by the Hearing Board after hearings on January 16 and 17, 2024, and March 21, 2024. The modified Stipulated Order contains 72 conditions. A status and modification hearing is scheduled for April 24 and 25, 2024.  

On February 15, 2024, CCL received a Summary of Violations (“SOV”) from the Department of Toxic Substances Control (“DTSC”). The SOV alleges violations of California’s hazardous waste control laws and their implementing regulations. Specifically, the SOV alleges five class I violations: four alleged violations of various laws and regulations related to one December 27, 2023 offsite shipment of leachate, a grab sample of which tested above a regulatory threshold, that was shipped to a non-hazardous waste treatment and disposal facility; and one alleged violation of 22 CCR § 66265.31

31

WASTE CONNECTIONS, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

(DOLLAR AMOUNTS IN THOUSANDS OF U.S. DOLLARS, EXCEPT PER SHARE, PER TON AND PER GALLON AMOUNTS)

for “fail[ing] to minimize the possibility of releases of hazardous waste or hazardous waste constituents to air, soil, or surface water which could threaten human health or the environment.”

On March 29, 2024, CCL received a second SOV from DTSC, again alleging violations of the California hazardous waste control laws and their implementing regulations. Specifically, the SOV alleges three class 1 violations: an additional alleged violation of 22 CCR § 66265.31; and two alleged violations of section 25189.2(c) of the Health & Safety Code for allegedly “dispos[ing], or caus[ing] the disposal of, a hazardous or extremely hazardous waste at a point that is not authorized” in two separate incidents.

CCL has submitted full responses to each SOV.

At this time, CCL is not able to determine the likely penalties that the regulatory agencies will seek for these violations, but they could be substantial. CCL also is incurring substantial costs in conjunction with efforts to address the ETLF event and any related impacts, including attendant air emissions, and to manage the increased production and changing composition of the liquids. At this time, the Company is not able to determine the likelihood of any outcome of the resolution of the SCAQMD NOVs or the DTSC SOVs, including the amount of penalties.

18.SUBSEQUENT EVENT

On April 24, 2024, the Company announced that its Board of Directors approved a regular quarterly cash dividend of $0.285 per Company common share. The dividend will be paid on May 23, 2024, to shareholders of record on the close of business on May 8, 2024.

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Item 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations

FORWARD-LOOKING STATEMENTS

The following discussion should be read in conjunction with our Condensed Consolidated Financial Statements and the related notes included in Part I, Item 1 of this Quarterly Report on Form 10-Q.

We make statements in this Quarterly Report on Form 10-Q that are forward-looking in nature.  These include:

● Statements regarding our landfills, including capacity, duration, special projects, demand for and pricing of recyclables, estimated closure and post-closure liabilities, landfill alternatives and related capital expenditures, operating expenses and leachate;

● Discussion of competition, loss of contracts, price increases and additional exclusive and/or long-term collection service arrangements;

● Forecasts of cash flows necessary for operations and free cash flow to reduce leverage as well as our ability to draw on our credit facility and access the capital markets to refinance or expand;

● Statements regarding our ability to access capital resources or credit markets;

● Plans for, and the amounts of, certain capital expenditures for our existing and newly acquired properties and equipment;

● Statements regarding fuel, oil and natural gas demand, prices, and price volatility;

● Assessments of regulatory developments and potential changes in environmental, health, safety and tax laws and regulations; and

● Other statements on a variety of topics such as inflation, credit risk of customers, seasonality, labor/pension costs and labor union activity, employee retention costs, operational and safety risks, acquisitions, litigation developments and results, goodwill impairments, insurance costs and cybersecurity threats.

These statements can be ‎identified by the use of forward-looking terminology such as “believes,” “expects,” “intends,” “may,” “might,” “will,” ‎‎“could,” “should” or “anticipates,” or the negative thereof or comparable terminology, or by discussions of strategy.

Our ‎business and operations are subject to a variety of risks and uncertainties and, consequently, actual results may differ ‎materially from those projected by any forward-looking statements. Factors that could cause actual results to differ ‎from those projected include, but are not limited to, risk factors detailed from time to time in our filings with the Securities and Exchange Commission, or SEC, and the securities commissions or similar regulatory authorities in Canada.  

There may be additional risks of which we are not presently aware or that we currently believe are immaterial that ‎could have an adverse impact on our business. We make no commitment to revise or update any forward-looking ‎statements to reflect events or circumstances that may change, unless required under applicable securities laws.

OVERVIEW OF OUR BUSINESS

We are an integrated solid waste services company that provides non-hazardous waste collection, transfer and disposal services, including by rail, along with resource recovery primarily through recycling and renewable fuels generation, in mostly exclusive and secondary markets across 46 states in the U.S. and six provinces in Canada. Waste Connections also provides non-hazardous oil and natural gas exploration and production (“E&P”) waste treatment, recovery and disposal

33

services in several basins across the U.S. and Canada, as well as intermodal services for the movement of cargo and solid waste containers in the Pacific Northwest.

Environmental, organizational and financial sustainability initiatives have been key components of our success since we were founded in 1997.  We continue to grow and expand these efforts and our disclosure regarding progress towards their achievement as our industry and technology continue to evolve.  To that end, we have committed $500 million to the advancement of long-term, aspirational ESG targets, which have been incorporated into executive compensation metrics. Our investments primarily focus on reducing emissions, increasing resource recovery of both recyclable commodities and clean energy fuels, reducing reliance on off-site disposal for landfill leachate, further improving safety through reduced incidents and enhancing employee engagement through improved voluntary turnover and Servant Leadership scores.  Our 2023 Sustainability Report can be found at www.wasteconnections.com/sustainability but does not constitute a part of, and is not incorporated by reference into, this Quarterly Report on Form 10-Q.

We generally seek to avoid highly competitive, large urban markets and instead target markets where we can attain high market share either through exclusive contracts, vertical integration or asset positioning. In markets where waste collection services are provided under exclusive arrangements, or where waste disposal is municipally owned or funded or available at multiple municipal sources, we believe that controlling the waste stream by providing collection services under exclusive arrangements is often more important to our growth and profitability than owning or operating landfills. We also target niche markets, like non-hazardous E&P waste treatment, recovery and disposal services.

The solid waste industry is local and highly competitive in nature, requiring substantial labor and capital resources. We compete for collection accounts primarily on the basis of price and, to a lesser extent, the quality of service, and compete for landfill business on the basis of tipping fees, geographic location and quality of operations. The solid waste industry has been consolidating and continues to consolidate as a result of a number of factors, including the increasing costs and complexity associated with waste management operations and regulatory compliance. Many small independent operators and municipalities lack the capital resources, management, operating skills and technical expertise necessary to operate effectively in such an environment. The consolidation trend has caused solid waste companies to operate larger landfills that have complementary collection routes that can use company-owned disposal capacity. Controlling the point of transfer from haulers to landfills has become increasingly important as landfills continue to close and disposal capacity moves farther from the collection markets it serves.

Generally, the most profitable operators within the solid waste industry are those companies that are vertically integrated or enter into long-term collection contracts. A vertically integrated operator will benefit from:  (1) the internalization of waste, which is bringing waste to a company-owned landfill; (2) the ability to charge third-party haulers tipping fees either at landfills or at transfer stations; and (3) the efficiencies gained by being able to aggregate and process waste at a transfer station prior to landfilling.

CRITICAL ACCOUNTING ESTIMATES AND ASSUMPTIONS

The preparation of financial statements in conformity with U.S. generally accepted accounting principles, or GAAP, requires estimates and assumptions that affect the reported amounts of assets and liabilities, revenues and expenses and related disclosures of contingent assets and liabilities in the condensed consolidated financial statements. As described by the SEC, critical accounting estimates and assumptions are those that may be material due to the levels of subjectivity and judgment necessary to account for highly uncertain matters or the susceptibility of such matters to change, and that have a material impact on the financial condition or operating performance of a company. Such critical accounting estimates and assumptions are applicable to our reportable segments. Refer to our most recent Annual Report on Form 10-K for a complete description of our critical accounting estimates and assumptions.

NEW ACCOUNTING PRONOUNCEMENTS

For a description of the new accounting standards that affect us, see Note 3 to our Condensed Consolidated Financial Statements included in Part I, Item 1 of this Quarterly Report on Form 10-Q.

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RESULTS OF OPERATIONS FOR THE THREE MONTHS ENDED MARCH 31, 2024 AND 2023

The following table sets forth items in our Condensed Consolidated Statements of Net Income in thousands of U.S. dollars and as a percentage of revenues for the periods indicated.

	Three Months Ended March 31,
	2024				2023
Revenues	$	2,072,653	100.0	%	$	1,900,503	100.0	%
Cost of operations		1,221,783	59.0			1,146,941	60.3
Selling, general and administrative		220,735	10.7			193,667	10.2
Depreciation		222,691	10.7			204,059	10.7
Amortization of intangibles		40,290	1.9			39,282	2.1
Impairments and other operating items		354	0.0			1,865	0.1
Operating income		366,800	17.7			314,689	16.6
Interest expense		(78,488)	(3.8)			(68,353)	(3.6)
Interest income		2,051	0.1			2,715	0.1
Other income (expense), net		(1,823)	(0.1)			3,174	0.2
Income tax provision		(59,413)	(2.9)			(54,389)	(2.9)
Net income		229,127	11.0			197,836	10.4
Net loss (income) attributable to noncontrolling interests		927	0.1			(23)	(0.0)
Net income attributable to Waste Connections	$	230,054	11.1	%	$	197,813	10.4	%

Revenues.  Total revenues increased $172.2 million, or 9.1%, to $2.073 billion for the three months ended March 31, 2024, from $1.901 billion for the three months ended March 31, 2023.

Acquisitions closed during, or subsequent to, the three months ended March 31, 2023, increased revenues by $80.6 million for the three months ended March 31, 2024.

Operations that were divested during, or subsequent to, the three months ended March 31, 2023, decreased revenues by $2.6 million for the three months ended March 31, 2024.

During the three months ended March 31, 2024, the net increase in prices charged to our customers at our existing operations was $128.5 million, consisting of $140.6 million of core price increases and decreases in surcharges of $12.1 million.

During the three months ended March 31, 2024, we recognized volume losses totaling $69.6 million, resulting from lower residential collection volumes due primarily to the purposeful shedding of certain low-margin municipal contracts in our Eastern, Canada and Southern segments, lower commercial revenues and a decrease in roll off and post collection volumes in part due to the weather impacting operations in certain geographic markets.

E&P waste revenues at facilities owned during the three months ended March 31, 2024 and 2023 increased $8.6 million, due to increases in overall demand for our E&P waste services as a result of increases in drilling and production activity levels in certain basins.

Revenues from sales of recyclable commodities at facilities owned during the three months ended March 31, 2024 and 2023 increased $15.3 million. The increase is primarily attributable to higher average commodity pricing for old corrugated cardboard, plastics and other paper products as compared to the prior period.

An increase in the average Canadian dollar to U.S. dollar currency exchange rate resulted in an increase in revenues of $0.4 million for the three months ended March 31, 2024. The average Canadian dollar to U.S. dollar exchange rates on our Canadian revenues were 0.7412 and 0.7397 for the three months ended March 31, 2024 and 2023, respectively.

Other revenues increased $11.0 million during the three months ended March 31, 2024, due primarily to an $11.7 million increase in landfill gas revenues on higher values for renewable energy credits and higher landfill gas volumes and

35

a $0.9 million increase in other non-core revenue sources, partially offset by a $1.6 million decrease in intermodal revenues.

Cost of Operations.  Total cost of operations increased $74.8 million, or 6.5%, to $1.222 billion for the three months ended March 31, 2024, from $1.147 billion for the three months ended March 31, 2023. The increase was primarily the result of $39.4 million of additional operating costs from acquisitions closed during, or subsequent to, the three months ended March 31, 2023, an increase in operating costs at our existing operations of $36.5 million, assuming foreign currency parity and an increase in operating costs of $0.3 million resulting from a lower average foreign currency exchange rate in effect during the current period, partially offset by a decrease of $1.4 million from operations divested during, or subsequent to, the three months ended March 31, 2023.

The increase in operating costs of $36.5 million, assuming foreign currency parity, at our existing operations for the three months ended March 31, 2024, consisted of higher labor and recurring incentive compensation expenses of $16.1 million, an increase in risk management expenses of $15.8 million due to higher claim and premium costs, an increase in post-closure liability interest accretion expense of $4.3 million, an increase in benefits costs of $3.3 million, an increase in disposal costs of $3.1 million, an increase in leachate costs of $3.0 million, an increase in truck, container, equipment and facility maintenance and repair expenses of $2.2 million, an increase in taxes on revenues of $1.9 million as the result of increased revenues and a net increase of other expenses of $2.2 million, partially offset by a decrease in fuel expense of $5.4 million due to lower diesel and natural gas prices, a decrease in subcontract expense of $3.7 million, a decrease in third-party trucking and transportation expenses of $3.2 million due to lower transfer station and intermodal volumes and a decrease in fees paid for the processing of recyclable materials of $3.1 million primarily as a result of higher commodity values.

Cost of operations as a percentage of revenues decreased 1.3 percentage points to 59.0% for the three months ended March 31, 2024, from 60.3% for the three months ended March 31, 2023. The decrease as a percentage of revenues was primarily driven by the impact of price-led revenue growth, a 0.5 percentage point decrease in third-party trucking and transportation expenses, a 0.5 percentage point decrease in fuel costs due to lower diesel and natural gas prices, a 0.3 percentage point decrease in truck, container, equipment and facility maintenance and repair expenses, a 0.3 percentage point decrease in disposal costs, a 0.2 percentage point decrease in subcontract costs and a 0.2 percentage point decrease from all other net changes, partially offset by a 0.7 percentage point increase in risk management expenses.

SG&A.  SG&A expenses increased $27.0 million, or 14.0%, to $220.7 million for the three months ended March 31, 2024, from $193.7 million for the three months ended March 31, 2023. The increase was comprised of an increase of $21.8 million, assuming foreign currency parity, at our existing operations, $5.1 million from acquisitions closed during, or subsequent to, the three months ended March 31, 2023 and an increase of $0.1 million resulting from a higher average foreign currency exchange rate in effect during the current period.

The increase in SG&A expenses at our existing operations of $21.8 million, assuming foreign currency parity, for the three months ended March 31, 2024 was comprised of an increase in direct acquisition expenses of $7.8 million due to an increase in acquisition activity in the current period, an increase in incentive compensation expense of $7.4 million, an increase in administrative payroll expenses of $2.6 million, a collective increase in travel, meetings and training expenses of $2.1 million, an increase in bad debt costs of $1.2 million associated with increased revenues, an increase in software license fees of $1.0 million and $3.2 million of other net expense increases, partially offset by a decrease in professional fees of $2.0 million and a decrease in equity-based compensation expenses of $1.5 million associated with our annual recurring grants of restricted share units to our personnel.

SG&A expenses as a percentage of revenues increased 0.5 percentage points to 10.7% for the three months ended March 31, 2024, from 10.2% for the three months ended March 31, 2023. The increase as a percentage of revenues was primarily attributable to a 0.4 percentage point increase in direct acquisition expenses due to an increase in acquisition activity and a 0.3 percentage point increase in incentive compensation costs, partially offset by a 0.2 percentage point decrease in accrued equity compensation expense.

Depreciation.  Depreciation expense increased $18.7 million, or 9.1%, to $222.7 million for the three months ended March 31, 2024, from $204.0 million for the three months ended March 31, 2023. The increase was comprised of an

36

increase in depreciation and depletion expense of $13.4 million from acquisitions closed during, or subsequent to, the three months ended March 31, 2023 and an increase in depreciation expense of $6.1 million from the impact of additions to our fleet and equipment purchased to support our existing operations, partially offset by a decrease of $0.8 million in depletion expense due to lower landfill volumes in certain markets.

Depreciation expense as a percentage of revenues remained flat at 10.7% for the three months ended March 31, 2024 and March 31, 2023. As compared to prior year, expenses as a percentage of revenues decreased due to the impact of price driven revenue increases in our solid waste services, offset by increases as a percentage of revenue from acquisitions closed during, or subsequent to, the three months ended March 31, 2023 having higher depreciation expense as a percentage of revenue than our company average.

Amortization of Intangibles.  Amortization of intangibles expense increased $1.0 million, or 2.6%, to $40.3 million for the three months ended March 31, 2024, from $39.3 million for the three months ended March 31, 2023. The increase was the result of $5.8 million from intangible assets acquired in acquisitions closed during, or subsequent to, the three months ended March 31, 2023, partially offset by a decrease of $4.8 million from certain intangible assets becoming fully amortized subsequent to March 31, 2023.

Amortization of intangibles expense as a percentage of revenues decreased 0.2 percentage points to 1.9% for the three months ended March 31, 2024, from 2.1% for the three months ended March 31, 2023. The decrease as a percentage of revenues was attributable to the impact of price-driven revenue increases in our solid waste services.

Impairments and Other Operating Items.  Impairments and other operating items decreased $1.5 million, to net losses totaling $0.4 million for the three months ended March 31, 2024, from net losses totaling $1.9 million for the three months ended March 31, 2023.

The net losses of $0.4 million recorded during the three months ended March 31, 2024 consisted of $1.1 million of net losses on the disposal of property and equipment and $0.6 million of other net adjustments, partially offset by $1.3 million gain from favorable lawsuit settlements.

The net losses of $1.9 million recorded during the three months ended March 31, 2023 resulted from disposal of property and equipment.

Operating Income.  Operating income increased $52.1 million, or 16.6%, to $366.8 million for the three months ended March 31, 2024, from $314.7 million for the three months ended March 31, 2023. 

The increase in our operating income for the three months ended March 31, 2024 was due primarily to price increases for our solid waste services, operating income generated from acquisitions closed during, or subsequent to, the three months ended March 31, 2023, an increase in earnings at our E&P waste operations, operating income contributions from increased renewable energy credits associated with the generation of landfill gas and contributions from higher recyclable commodity pricing, partially offset by an increase in risk management costs, an increase in direct acquisition expenses associated with increased acquisition activity as compared to the prior year period and increased incentive compensation expense.

Operating income as a percentage of revenues increased 1.1 percentage points to 17.7% for the three months ended March 31, 2024, from 16.6% for the three months ended March 31, 2023.  The increase as a percentage of revenues was comprised of a 1.3 percentage point decrease in our costs of operations, a 0.2 percentage point decrease in amortization expense and a 0.1 percentage point decrease in impairments and other operating items, partially offset by a 0.5 percentage point increase in SG&A expenses.

Interest Expense.  Interest expense increased $10.1 million, or 14.8%, to $78.5 million for the three months ended March 31, 2024, from $68.4 million for the three months ended March 31, 2023. The increase was primarily attributable to an increase of $7.6 million due to an increase in the average borrowings outstanding under our Revolving Credit Agreement entered into during the three months ended March 31, 2024, an increase of $4.1 million from the issuance of $750.0 million of senior unsecured notes during the three months ended March 31, 2024, an increase of $2.7 million from

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higher interest rates on borrowings outstanding during the comparative periods, and $1.5 million of other net expense increases, partially offset by a $5.8 million decrease attributable to a decrease in the average borrowings outstanding under our 2021 Revolving and Term Credit Agreement and 2022 Term Loan Agreement as a result of the early termination of these agreements during the three months ended March 31, 2024.

Interest Income.  Interest income decreased $0.6 million to $2.1 million for the three months ended March 31, 2024, from $2.7 million for the three months ended March 31, 2023. The decrease was primarily attributable to lower average investment rates in the current period.

Other Income (Expense), Net.  Other income (expense), net decreased $5.0 million, to an expense of $1.8 million for the three months ended March 31, 2024, from income of $3.2 million for the three months ended March 31, 2023.

Other expense of $1.8 million recorded during the three months ended March 31, 2024 consisted of $2.3 million from the write off of unamortized loan fees as a result of the early extinguishment of our 2021 Revolving and Term Credit Agreement and 2022 Term Loan Agreement, $0.5 million from an increase in the average foreign currency exchange rate in effect during the comparable reporting period reducing the U.S. dollar consideration required to settle international liabilities and $0.7 million of net losses from other sources, partially offset by $1.7 million from an increase in the value of investments purchased to fund our employee deferred compensation obligations.

Other income of $3.2 million recorded during the three months ended March 31, 2023 consisted of increases in other income of $1.9 million derived from higher interest rates in the current period on restricted cash and $1.3 million from an increase in the value of investments purchased to fund our employee deferred compensation obligations.

Income Tax Provision.  Income taxes increased $5.0 million, to $59.4 million for the three months ended March 31, 2024, from $54.4 million for the three months ended March 31, 2023. Our effective tax rate for the three months ended March 31, 2024 was 20.6%. Our effective tax rate for the three months ended March 31, 2023 was 21.6%. 

The income tax provision for the three months ended March 31, 2024 included a benefit of $5.2 million from share-based payment awards being recognized in the income statement when settled, as well as a portion of our internal financing being taxed at effective rates substantially lower than the U.S. federal statutory rate.

The income tax provision for the three months ended March 31, 2023 included a benefit of $2.7 million from share-based payment awards being recognized in the income statement when settled, as well as a portion of our internal financing being taxed at effective rates substantially lower than the U.S. federal statutory rate.

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SEGMENT RESULTS

General

No single contract or customer accounted for more than 10% of our total revenues at the consolidated or reportable segment level during the periods presented. The following table disaggregates our revenue by service line for the periods indicated (in thousands of U.S. dollars).

	Three Months Ended March 31,
	2024		2023
Commercial	$	642,859	$	602,279
Residential		546,211		514,053
Industrial and construction roll off		325,990		318,315
Total collection		1,515,060		1,434,647
Landfill		353,478		343,433
Transfer		301,882		273,521
Recycling		49,025		31,301
E&P		97,408		51,759
Intermodal and other		49,541		38,212
Intercompany		(293,741)		(272,370)
Total	$	2,072,653	$	1,900,503

For the three months ended March 31, 2024, we managed our operations through the following six geographic solid waste operating segments: Western, Southern, Central, Eastern, Canada and MidSouth. Our six geographic solid waste operating segments comprise our reportable segments.  Each operating segment is responsible for managing several vertically integrated operations, which are comprised of districts.  Certain corporate or regional overhead expense allocations may affect comparability of the segment information presented herein on a period-over-period basis.

Our 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. We define 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. Our 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.

Summarized financial information for our reportable segments are shown in the following tables in thousands of U.S. dollars and as a percentage of total segment revenue for the periods indicated.

Three Months Ended					EBITDA		Depreciation and
March 31, 2024	Revenue		EBITDA (b)		Margin		Amortization
Western	$	422,249	$	113,050	26.8	%	$	51,221
Southern		418,946		128,412	30.7	%		44,707
Central		360,927		125,922	34.9	%		40,787
Eastern		360,063		95,016	26.4	%		53,548
Canada		280,362		121,361	43.3	%		39,109
MidSouth		230,106		57,507	25.0	%		29,889
Corporate(a)		—		(11,133)	—			3,720
	$	2,072,653	$	630,135	30.4	%	$	262,981

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Three Months Ended					EBITDA		Depreciation and
March 31, 2023	Revenue		EBITDA (b)		Margin		Amortization
Western	$	395,839	$	110,689	28.0	%	$	47,646
Southern		399,893		121,914	30.5	%		45,049
Central		339,985		115,756	34.0	%		41,376
Eastern		329,128		73,275	22.3	%		48,037
Canada		227,156		82,984	36.5	%		29,992
MidSouth		208,502		57,731	27.7	%		27,483
Corporate(a)		—		(2,454)	—			3,758
	$	1,900,503	$	559,895	29.5	%	$	243,341

____________________

(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 for our Corporate segment for the periods presented.

(b) For those items included in the determination of segment EBITDA, the accounting policies of the segments are the same as those described in our most recent Annual Report on Form 10-K.

A reconciliation of segment EBITDA to Income before income tax provision is included in Note 10 to our Condensed Consolidated Financial Statements included in Part 1, Item 1 of this report.

Significant changes in revenue, EBITDA and depreciation, depletion and amortization for our reportable segments for the three month period ended March 31, 2024, compared to the three month period ended March 31, 2023, are discussed below.

Western

Revenue increased $26.4 million to $422.2 million for the three months ended March 31, 2024, from $395.8 million for the three months ended March 31, 2023, due to price increases, contributions from acquisitions and increases in residential collection volumes, partially offset by decreased transfer volumes and lower intermodal revenue.

EBITDA increased $2.4 million to $113.1 million, or a 26.8% EBITDA margin for the three months ended March 31, 2024, from $110.7 million, or a 28.0% EBITDA margin for the three months ended March 31, 2023. The decrease in our EBITDA margin was due to an increase in risk management expenses due to higher claim and premium costs, an increase in post-closure liability interest accretion expense, higher leachate costs and an increase in allocated corporate overhead, partially offset by a decrease in recycle processing fees, lower fuel costs due to lower diesel and natural gas prices, a decrease in truck, container, equipment and facility maintenance and repair costs and lower other operating costs as compared to the prior year period.

Depreciation, depletion and amortization expense increased $3.6 million, to $51.2 million for the three months ended March 31, 2024, from $47.6 million for the three months ended March 31, 2023, due to assets acquired in acquisitions, additions to our fleet and equipment and increases in depletion expense associated with higher landfill development and closure costs increasing our per ton landfill depletion rates.

Southern

Revenue increased $19.0 million to $418.9 million for the three months ended March 31, 2024, from $399.9 million for the three months ended March 31, 2023, due to solid waste price increases, contributions from acquisitions, increased E&P waste revenues attributable to increases in the demand for our E&P waste services and an increase in recyclable commodity prices as compared to the prior year period, partially offset by lower residential collection volumes due to the purposeful non-renewal of collection contracts during the current and prior year periods, lower commercial collection volume and a decrease in post-collection volume.

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EBITDA increased $6.5 million to $128.4 million, or a 30.7% EBITDA margin for the three months ended March 31, 2024, from $121.9 million, or a 30.5% EBITDA margin for the three months ended March 31, 2023. The increase in our EBITDA margin was due to price-led increases in solid waste revenue, increased earnings at our E&P waste operations, lower legal costs, decreases in fuel costs and the purposeful non-renewal of certain residential contracts, partially offset by an increase in risk management expenses, increased leachate expense, higher allocated overhead expense, increased benefits costs and an increase in bad debt expense.

Depreciation, depletion and amortization expense decreased $0.3 million, to $44.7 million for the three months ended March 31, 2024, from $45.0 million for the three months ended March 31, 2023, due to a reduction in amortization expense associated with the loss of certain residential service contracts.

Central

Revenue increased $20.9 million to $360.9 million for the three months ended March 31, 2024, from $340.0 million for the three months ended March 31, 2023, due to price increases and an increase in recyclable commodity prices as compared to the prior year period, partially offset by lower post collection volumes and a decrease in residential collection.

EBITDA increased $10.1 million to $125.9 million, or a 34.9% EBITDA margin for the three months ended March 31, 2024, from $115.8 million, or a 34.0% EBITDA margin for the three months ended March 31, 2023. The increase in our EBITDA margin was due to the benefits from price-led increases in revenue and decreases in fuel costs, partially offset by an increase in risk management expenses and an increase in allocated corporate overhead.

Depreciation, depletion and amortization expense decreased $0.6 million, to $40.8 million for the three months ended March 31, 2024, from $41.4 million for the three months ended March 31, 2023, due to a decrease in depletion as a result of lower landfill volumes and a reduction in amortization expense associated with certain intangible assets becoming fully amortized subsequent to March 31, 2023, partially offset by additions to our fleet and equipment as compared to the prior year periods.

Eastern

Revenue increased $31.0 million to $360.1 million for the three months ended March 31, 2024, from $329.1 million for the three months ended March 31, 2023, due to contributions from acquisitions, price increases and an increase in recyclable commodity prices as compared to the prior year period, partially offset by decreased residential and commercial service revenues and lower roll off volumes.

EBITDA increased $21.7 million to $95.0 million, or a 26.4% EBITDA margin for the three months ended March 31, 2024, from $73.3 million, or a 22.3% EBITDA margin for the three months ended March 31, 2023. The increase in our EBITDA margin was due primarily to price-led increases in revenue, lower labor and benefits costs, a decrease in trucking and disposal expenses as a result of purposefully lost volumes and increased internalization in certain markets, a decrease in leachate costs, lower professional fees as a result of a decrease in legal costs and a decrease in truck, container, equipment and facility maintenance and repair expenses, partially offset by the impact of acquisitions having lower EBITDA margins than our segment average and an increase in risk management expenses.

Depreciation, depletion and amortization expense increased $5.5 million, to $53.5 million for the three months ended March 31, 2024, from $48.0 million for the three months ended March 31, 2023, due to assets acquired in acquisitions and additions to our fleet and equipment, partially offset by a reduction in amortization expense associated with the loss of certain residential service contracts.

Canada

Revenue increased $53.2 million to $280.4 million for the three months ended March 31, 2024, from $227.2 million for the three months ended March 31, 2023, due to contributions from acquisitions, price increases, an increase in landfill gas revenues and higher prices for recyclable commodities as compared to the prior year period, partially offset by a decrease in residential and commercial collection volumes.

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EBITDA increased $38.4 million to $121.4 million, or a 43.3% EBITDA margin for the three months ended March 31, 2024, from $83.0 million, or a 36.5% EBITDA margin for the three months ended March 31, 2023. The increase in our EBITDA margin was due to the impact of acquisitions having higher EBITDA margins than our segment average, price-led increases in revenue, an increase in earnings associated with landfill gas revenues from higher values for renewable energy credits and higher landfill gas volumes and decreases in diesel and natural gas costs due to a decline in average fuel prices, partially offset by an increase in allocated corporate overhead expense as compared to the prior year period.

Depreciation, depletion and amortization expense increased $9.1 million, to $39.1 million for the three months ended March 31, 2024, from $30.0 million for the three months ended March 31, 2023, due to assets acquired in acquisitions.

MidSouth

Revenue increased $21.6 million to $230.1 million for the three months ended March 31, 2024, from $208.5 million for the three months ended March 31, 2023, due to price increases and contributions from acquisitions, partially offset by a decrease in roll off volumes.

EBITDA decreased $0.2 million to $57.5 million, or a 25.0% EBITDA margin for the three months ended March 31, 2024, from $57.7 million, or a 27.7% EBITDA margin for the three months ended March 31, 2023. The decrease in our EBITDA margin was due primarily to an increase in risk management expenses, an increase in allocated corporate overhead and benefits expense, higher labor costs and an increase in bad debt expense, partially offset by price-led revenue growth, lower disposal and trucking costs due to increased internalization in certain markets, lower leachate costs, a decrease in professional fees and lower fuel costs.

Depreciation, depletion and amortization expense increased $2.4 million, to $29.9 million for the three months ended March 31, 2024, from $27.5 million for the three months ended March 31, 2023, due to assets acquired in acquisitions and additions to our fleet and equipment.

Corporate

EBITDA decreased $8.6 million, to a loss of $11.1 million for the three months ended March 31, 2024, from a loss of $2.5 million for the three months ended March 31, 2023. The decrease in our EBITDA for the three months ended March 31, 2024 was due to an increase in direct acquisition expenses associated with an increase in acquisition activity in the current year period, increased incentive compensation costs, increased professional fees, increased administrative payroll costs and increased software costs, partially offset by lower costs due to lower travel and meetings and increased allocation of costs to our operating segments.

LIQUIDITY AND CAPITAL RESOURCES

The following table sets forth cash flow information for the three months ended March 31, 2024 and 2023 (in thousands of U.S. dollars):

	Three Months Ended
	March 31,
	2024		2023
Net cash provided by operating activities	$	490,309	$	442,358
Net cash used in investing activities		(1,334,579)		(317,759)
Net cash provided by (used in) financing activities		878,477		(65,424)
Effect of exchange rate changes on cash, cash equivalents and restricted cash		(577)		(54)
Net increase in cash, cash equivalents and restricted cash		33,630		59,121
Cash, cash equivalents and restricted cash at beginning of period		184,038		181,364
Cash, cash equivalents and restricted cash at end of period	$	217,668	$	240,485

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Operating Activities Cash Flows

Net cash provided by operating activities increased $48.0 million to $490.3 million for the three months ended March 31, 2024, from net cash provided by operating activities of $442.3 million for the three months ended March 31, 2023.  The significant components of the increase included the following:

1) Increase in earnings — Our increase in net cash provided by operating activities was favorably impacted by $54.8 million from an increase in net income, excluding depreciation, amortization of intangibles, share-based compensation, adjustments to closure and post-closure liabilities, adjustments to and payments of contingent consideration recorded in earnings and loss on disposal of assets and impairments, due primarily to price increases, earnings from acquisitions closed during, or subsequent to, the three months ended March 31, 2023, an increase in renewable energy credits associated with the generation of landfill gas and an increase in earnings at our E&P waste operations.

2) Accounts payable and accrued liabilities — Our increase in net cash provided by operating activities was favorably impacted by $33.3 million from accounts payable and accrued liabilities as changes in accounts payable and accrued liabilities resulted in a decrease to operating cash flows of $59.6 million for the three months ended March 31, 2024, compared to a decrease to operating cash flows of $92.9 million for the three months ended March 31, 2023. The decrease for the three months ended March 31, 2024 was due primarily to outstanding obligations to vendors and accrued annual management bonus compensation as of December 31, 2023 that were paid in the current year period, partially offset by an increase in accrued insurance costs and an increase in accrued interest due to the timing of interest payments. The decrease for the three months ended March 31, 2023 was due primarily to outstanding obligations to vendors and accrued annual management bonus compensation as of December 31, 2022 that were paid in the current year period.

3) Closure and post closure expenditures – Our increase in net cash provided by operating activities was unfavorably impacted by $23.6 million from an increase in payments for closure and post closure activities as changes in expenditures for these items resulted in a decrease to operating cash flows of $28.9 million for the three months ended March 31, 2024, compared to a decrease in operating cash flows of $5.3 million for the three months ended March 31, 2023.

4) Accounts receivable — Our increase in net cash provided by operating activities was unfavorably impacted by $15.6 million from accounts receivable as changes in accounts receivable resulted in an increase to operating cash flows of $5.4 million for the three months ended March 31, 2024, compared to an increase to operating cash flows of $21.0 million for the three months ended March 31, 2023. The increases for the three months ended March 31, 2023 and 2024 were due to an additional collection day in the periods, partially offset by increases in revenue, which remained as outstanding receivables at the end of the periods.

5) Prepaid expenses — Our increase in net cash provided by operating activities was unfavorably impacted by $8.2 million from prepaid expenses as changes in prepaid expenses resulted in an increase to operating cash flows of $10.4 million for the three months ended March 31, 2024, compared to an increase to operating cash flows of $18.6 million for the three months ended March 31, 2023. The increase for the three months ended March 31, 2024 was due primarily to a decrease in prepaids related to the timing of insurance claim payments. The increase for the three months ended March 31, 2023 was due primarily to decreased prepaid income tax payments and lower payments of annual insurance premiums.

6) Deferred revenue — Our increase in net cash provided by operating activities was unfavorably impacted by $6.8 million from deferred revenue as changes in deferred revenue resulted in an increase to operating cash flows of $4.1 million for the three months ended March 31, 2024, compared to an increase to operating cash flows of $10.8 million for the three months ended March 31, 2023. For both comparative periods, deferred revenue increased due to price increases on our advanced billed residential and commercial collection services.

At March 31, 2024, we had a working capital deficit of $414.5 million, including cash and equivalents of $112.0 million.  Our working capital deficit decreased $131.6 million from a working capital deficit of $546.1 million at December 31, 2023 including cash and equivalents of $78.4 million, due primarily to decreases in accounts payable and accrued liabilities driven by the timing of payments for obligations to vendors and the timing of payment of annual management bonus compensation, an increase in accounts receivables as a result of increases in revenue and an increase in cash balances. To date, we have experienced no loss or lack of access to our cash and equivalents; however, we can provide no assurances that access to our cash and equivalents will not be impacted by adverse conditions in the financial

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markets.  Our strategy in managing our working capital is generally to apply the cash generated from our operations that remains after satisfying our working capital and capital expenditure requirements, along with share repurchase and dividend programs, to reduce the unhedged portion of our indebtedness under our Revolving Credit Agreement and to minimize our cash balances.

Investing Activities Cash Flows

Net cash used in investing activities increased $1.017 billion to $1.335 billion for the three months ended March 31, 2024, from $317.8 million for the three months ended March 31, 2023. The significant components of the increase included the following:

1) An increase in cash paid for acquisitions of $1.012 billion; less

2) A decrease in capital expenditures at operations owned in the comparable periods of $5.8 million due to decreases in landfill site costs, partially offset by increases in land and facility expenditures.

Financing Activities Cash Flows

Net cash provided by financing activities increased $943.9 million to $878.5 million for the three months ended March 31, 2024, from net cash used in financing activities of $65.4 million for the three months ended March 31, 2023. The significant components of the increase included the following:

1) An increase from the net change in long-term borrowings of $985.5 million in which long-term borrowings increased $1.003 billion during the three months ended March 31, 2024 and increased $17.3 million during the three months ended March 31, 2023; less

2) A decrease from higher payments related to the issuance of debt of $10.1 million that occurred during the three months ended March 31, 2024;

3) A decrease from higher payments of contingent consideration of $10.0 million not included in earnings that occurred during the three months ended March 31, 2024;

4) A decrease from tax withholdings related to net share settlements of equity-based compensation of $7.9 million due to an increase in the value of equity-based compensation awards vesting; and

5) A decrease from higher cash dividends paid of $7.8 million due primarily to an increase in our quarterly dividend rate for the three months ended March 31, 2024 to $0.285 per share, from $0.255 per share for the three months ended March 31, 2023.

On July 25, 2023, our Board of Directors approved, subject to receipt of regulatory approvals, the annual renewal of our normal course issuer bid, or the NCIB, to purchase up to 12,881,534 of our 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 our option. Shareholders may obtain a copy of our TSX Form 12 – Notice of Intention to Make a Normal Course Issuer Bid, without charge, by request directed to our Executive Vice President and Chief Financial Officer at (832) 442-2200.  The timing and amounts of any repurchases pursuant to the NCIB will depend on many factors, including our capital structure, the market price of our common shares, any share buyback taxes applicable and overall market conditions. All common shares purchased under the NCIB will be immediately cancelled following their repurchase.  Information regarding our NCIB plan can be found under the section “Normal Course Issuer Bid” in Note 16 to the Condensed Consolidated Financial Statements included in Part I, Item 1 of this Quarterly Report on Form 10-Q and is incorporated herein by reference.

Our Board of Directors authorized the initiation of a quarterly cash dividend in October 2010 and has increased it on an annual basis.  In October 2023, we announced that our Board of Directors increased our regular quarterly cash dividend by $0.03, from $0.255 to $0.285 per share.  Cash dividends of $73.6 million and $65.8 million were paid during the three months ended March 31, 2024 and 2023, respectively. We cannot assure as to the amounts or timing of future dividends.

Our business is capital intensive. Our capital requirements include acquisitions and capital expenditures, including for landfill cell construction, landfill development, landfill closure activities and intermodal facility construction in the future.

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We made $170.0 million in capital expenditures for property and equipment during the three months ended March 31, 2024, and we expect to make total capital expenditures for property and equipment of approximately $1.150 billion in 2024, including approximately $150 million associated with renewable natural gas facilities.  We have funded and intend to fund the balance of our planned 2024 capital expenditures principally through cash on hand, internally generated funds and borrowings under our Revolving Credit Agreement. In addition, we may make substantial additional capital expenditures in acquiring land and solid waste businesses. If we acquire additional landfill disposal facilities, we may also have to make significant expenditures to bring them into compliance with applicable regulatory requirements, obtain permits or expand our available disposal capacity. We cannot currently determine the amount of these expenditures because they will depend on the number, nature, condition and permitted status of any acquired landfill disposal facilities. We believe that our cash and equivalents, Revolving Credit Agreement and the funds we expect to generate from operations will provide adequate cash to fund our working capital and other cash needs for the foreseeable future. However, disruptions in the capital and credit markets could adversely affect our ability to draw on our Revolving Credit Agreement or raise other capital. Our access to funds under the Revolving Credit Agreement is dependent on the ability of the banks that are parties to the agreement to meet their funding commitments. Those banks may not be able to meet their funding commitments if they experience shortages of capital and liquidity or if they experience excessive volumes of borrowing requests within a short period of time.

On February 21, 2024, we completed an underwritten public offering of $750.0 million aggregate principal amount of our 5.00% Senior Notes due 2034 (the “2034 Senior Notes”). The 2034 Senior Notes were issued under the Indenture, dated as of November 16, 2018, by and between the Company and U.S. Bank Trust Company, National Association, as successor in interest to U.S. Bank National Association, as trustee, as supplemented by the Eighth Supplemental Indenture, dated as of February 21, 2024. See Note 9 to our Condensed Consolidated Financial Statements for further details on the 2034 Senior Notes.  

 On February 27, 2024, the Company used a portion of the proceeds from borrowings under the Revolving Credit Agreement (as defined and described below) to (i) prepay the amounts outstanding under that certain Second Amended and Restated Revolving Credit and Term Loan Agreement, dated as of July 30, 2021 (as amended, restated, supplemented or otherwise modified from time to time, the “2021 Revolving and Term Credit Agreement”), among the Company, as borrower, Bank of America, N.A., acting through its Canada Branch, as the global agent, the swing line lender and a letter of credit issuer, Bank of America, N.A., as the U.S. agent and a letter of credit issuer, and the lenders and any other financial institutions from time to time party thereto and (ii) terminate the 2021 Revolving and Term Credit Agreement and the loan documents associated therewith.

On February 27, 2024, the Company used a portion of the proceeds from borrowings under the Revolving Credit Agreement to (i) prepay the amounts outstanding under that certain Term Loan Agreement, dated as of October 31, 2022 (as amended, restated, supplemented or otherwise modified from time to time, the “2022 Term Loan Agreement”), among the Company, as borrower, Bank of America, N.A., as administrative agent, and the lenders and any other financial institutions from time to time party thereto and (ii) terminate the 2022 Term Loan Agreement and the loan documents associated therewith.

On February 27, 2024, the Company, as borrower, Bank of America, N.A., acting through its Canada Branch, as the global agent, the swing line lender, and a letter of credit issuer, Bank of America, N.A., as the U.S. agent and a letter of credit issuer, and the other lenders from time to time party thereto (the “Lenders”) entered into that certain Revolving Credit Agreement (as amended, restated, supplemented or otherwise modified from time to time, the “Revolving Credit Agreement”), pursuant to which the Lenders made loans and other credit extensions to the Company under a revolving credit facility.  The Company intends to use substantially all of the proceeds of the borrowings under the Revolving Credit Agreement (i) to repay certain outstanding indebtedness under other credit facilities, (ii) to finance acquisitions, dividends or other equity distributions, in each case as permitted thereunder, (iii) for capital expenditures, working capital and payment of certain transaction fees, costs and expenses and (iv) other lawful corporate purposes. See Note 9 to our Condensed Consolidated Financial Statements for further details on the new Revolving Credit Agreement.  

At March 31, 2024, $2.238 billion under the revolving credit facility was outstanding under the Revolving Credit Agreement, exclusive of outstanding standby letters of credit of $38.8 million. We also had $103.0 million of letters of

45

credit issued and outstanding at March 31, 2024 under a facility other than the Revolving Credit Agreement.  Our Revolving Credit Agreement matures on February 27, 2029.  

We are a well-known seasoned issuer with an effective shelf registration statement on Form S-3 filed in September 2021, which registers an unspecified amount of debt securities, including debentures, notes or other types of debt.   In the future, we may issue debt securities under our shelf registration statement or in private placements from time to time on an opportunistic basis, based on market conditions and available pricing. Unless otherwise indicated in the relevant offering documents, we expect to use the proceeds from any such offerings for general corporate purposes, including repaying, redeeming or repurchasing debt, acquiring additional assets or businesses, capital expenditures and increasing our working capital.

At March 31, 2024, we had the following contractual obligations:

	Payments Due by Period
	(amounts in thousands of U.S. dollars)
			Less Than		1 to 3				Over 5
Recorded Obligations	Total		1 Year		Years		3 to 5 Years		Years
Long-term debt	$	7,884,210	$	16,096	$	13,523	$	2,747,572	$	5,107,019
Cash interest payments	$	2,998,960	$	322,299	$	665,493	$	667,584	$	1,343,584
Contingent consideration	$	133,733	$	96,931	$	3,224	$	3,224	$	30,354
Operating leases	$	363,369	$	35,850	$	81,893	$	67,712	$	177,914
Final capping, closure and post-closure	$	2,158,430	$	85,919	$	70,697	$	49,042	$	1,952,772

____________________

Long-term debt payments include:

1) $2.238 billion in principal payments due February 27, 2029 related to our revolving credit facility under our Revolving Credit Agreement.  We may elect to draw amounts on our Revolving Credit Agreement in U.S. dollar term SOFR rate loans, U.S. dollar base rate loans, Canadian dollar term CORRA rate loans, and Canadian dollar prime rate loans.  At March 31, 2024, $1.195 billion of the outstanding borrowings drawn under the revolving credit facility were in U.S. term SOFR rate loans, which bear interest at the term SOFR rate plus the applicable margin (for a total rate of 6.43% on such date).  At March 31, 2024, $1.043 billion of the outstanding borrowings drawn under the revolving credit facility were in Canadian-based CORRA rate loans, which bear interest at the term CORRA rate plus the applicable margin (for a total rate ranging from 6.30% to 6.31% on such date).

2) $500.0 million in principal payments due 2028 related to our 2028 Senior Notes. The 2028 Senior Notes bear interest at a rate of 4.25%.

3) $500.0 million in principal payments due 2029 related to our 2029 Senior Notes. The 2029 Senior Notes bear interest at a rate of 3.50%.

4) $600.0 million in principal payments due 2030 related to our 2030 Senior Notes. The 2030 Senior Notes bear interest at a rate of 2.60%.

5) $650.0 million in principal payments due 2032 related to our 2032 Senior Notes. The 2032 Senior Notes bear interest at a rate of 2.20%.

6) $500.0 million in principal payments due 2032 related to our New 2032 Senior Notes. The New 2032 Senior Notes bear interest at a rate of 3.20%.

7) $750.0 million in principal payments due 2033 related to our 2033 Senior Notes. The 2033 Senior Notes bear interest at a rate of 4.20%.

8) $750.0 million in principal payments due 2034 related to our 2034 Senior Notes. The 2034 Senior Notes bear interest at a rate of 5.00%.

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9) $500.0 million in principal payments due 2050 related to our 2050 Senior Notes. The 2050 Senior Notes bear interest at a rate of 3.05%.

10) $850.0 million in principal payments due 2052 related to our 2052 Senior Notes. The 2052 Senior Notes bear interest at a rate of 2.95%.

11) $37.1 million in principal payments related to our notes payable to sellers and other third parties. Our notes payable to sellers and other third parties bear interest at rates between 2.42% and 10.35% at March 31, 2024, and have maturity dates ranging from 2028 to 2036.

12) $9.3 million in principal payments related to our financing leases.  Our financing leases bear interest at rates between 1.89% and 5.07% at March 31, 2024, and have expiration dates ranging from 2026 to 2029.

The following assumptions were made in calculating cash interest payments:

1) We calculated cash interest payments on the Revolving Credit Agreement using the term SOFR rate plus the applicable term SOFR margin, the base rate plus the applicable base rate margin, the term CORRA rate plus the applicable margin and the Canadian prime rate plus the applicable prime rate margin at March 31, 2024. We assumed the Revolving Credit Agreement is paid off when it matures on February 27, 2024.

2) We calculated cash interest payments on our interest rate swaps using the stated interest rate in the swap agreement less the Term SOFR rate through the earlier expiration of the term of the swaps or the term of the credit facility.

Contingent consideration payments include $117.7 million recorded as liabilities in our Condensed Consolidated Financial Statements at March 31, 2024, and $16.0 million of future interest accretion on the recorded obligations.

We are party to operating lease agreements and finance leases. These lease agreements are established in the ordinary course of our business and are designed to provide us with access to facilities and equipment at competitive, market-driven prices.

The estimated final capping, closure and post-closure expenditures presented above are in current dollars.

	Amount of Commitment Expiration Per Period
	(amounts in thousands of U.S. dollars)
			Less Than		1 to 3		3 to 5		Over 5
Unrecorded Obligations(1)	Total		1 Year		Years		Years		Years
Unconditional purchase obligations	$	143,185	$	113,353	$	28,280	$	1,242	$	310

____________________

(1) We are party to unconditional purchase obligations. These purchase obligations are established in the ordinary course of our business and are designed to provide us with access to products at competitive, market-driven prices. At March 31, 2024, our unconditional purchase obligations consisted of multiple fixed-price fuel purchase contracts under which we have 47.2 million gallons remaining to be purchased for a total of $143.2 million. The current fuel purchase contracts expire on or before September 30, 2029. These arrangements have not materially affected our financial position, results of operations or liquidity during the three months ended March 31, 2024, nor are they expected to have a material impact on our future financial position, results of operations or liquidity.

We have obtained financial surety bonds, primarily to support our financial assurance needs and landfill and E&P waste operations. We provided customers and various regulatory authorities with surety bonds in the aggregate amounts of approximately $1.688 billion and $1.645 billion at March 31, 2024 and December 31, 2023, respectively. These arrangements have not materially affected our financial position, results of operations or liquidity during the three months ended March 31, 2024, nor are they expected to have a material impact on our future financial position, results of operations or liquidity.

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From time to time, we evaluate our existing operations and their strategic importance to us. If we determine that a given operating unit does not have future strategic importance, we may sell or otherwise dispose of those operations. Although we believe our reporting units would not be impaired by such dispositions, we could incur losses on them.

The disposal tonnage that we received in the three month periods ended March 31, 2024 and 2023, at all of our landfills during the respective period, is shown below (tons in thousands):

	Three Months Ended March 31,
	2024		2023
	Number	Total	Number	Total
	of Sites	Tons	of Sites	Tons
Owned operational landfills and landfills operated under life-of-site agreements	105	11,820	94	11,681
Operated landfills	7	170	7	160
	112	11,990	101	11,841

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NON-GAAP FINANCIAL MEASURES

Adjusted Free Cash Flow

We present adjusted free cash flow, a non-GAAP financial measure, supplementally because it is widely used by investors as a liquidity measure in the solid waste industry. We calculate adjusted free cash flow as net cash provided by operating activities, plus or minus change in book overdraft, plus proceeds from disposal of assets, less capital expenditures for property and equipment and periodic distributions to noncontrolling interests. We further adjust this calculation to exclude the effects of items management believes impact the ability to evaluate the liquidity of our business operations. This measure is not a substitute for, and should be used in conjunction with, GAAP liquidity or financial measures. Other companies may calculate adjusted free cash flow differently. Our adjusted free cash flow for the three month periods ended March 31, 2024 and 2023, are calculated as follows (amounts in thousands of U.S. dollars):

	Three Months Ended
	March 31,
	2024		2023
Net cash provided by operating activities	$	490,309	$	442,358
Plus (less): Change in book overdraft		(271)		5,421
Plus: Proceeds from disposal of assets		1,085		1,260
Less: Capital expenditures for property and equipment		(169,951)		(175,786)
Adjustments:
Transaction-related expenses (a)		4,976		1,249
Pre-existing Progressive Waste share-based grants (b)		14		(2)
Tax effect (c)		(1,369)		(519)
Adjusted free cash flow	$	324,793	$	273,981

____________________

(a) Reflects the addback of acquisition-related transaction costs.

(b) Reflects the cash settlement of pre-existing Progressive Waste share-based awards during the period.

(c) The aggregate tax effect of footnotes (a) through (b) is calculated based on the applied tax rates for the respective periods.

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Adjusted EBITDA

We present adjusted EBITDA, a non-GAAP financial measure, supplementally because it is widely used by investors as a performance and valuation measure in the solid waste industry. Management uses adjusted EBITDA as one of the principal measures to evaluate and monitor the ongoing financial performance of our operations. We define adjusted EBITDA as net income attributable to Waste Connections, plus or minus net income (loss) attributable to noncontrolling interests, plus income tax provision, plus interest expense, less interest income, plus depreciation and amortization expense, plus closure and post-closure accretion expense, plus or minus any loss or gain on impairments and other operating items, plus other expense, less other income. We further adjust this calculation to exclude the effects of other items management believes impact the ability to assess the operating performance of our business. This measure is not a substitute for, and should be used in conjunction with, GAAP financial measures. Other companies may calculate adjusted EBITDA differently. Our adjusted EBITDA for the three month periods ended March 31, 2024 and 2023, are calculated as follows (amounts in thousands of U.S. dollars):

	Three Months Ended
	March 31,
	2024		2023
Net income attributable to Waste Connections	$	230,054	$	197,813
Plus (less): Net income (loss) attributable to noncontrolling interests		(927)		23
Plus: Income tax provision		59,413		54,389
Plus: Interest expense		78,488		68,353
Less: Interest income		(2,051)		(2,715)
Plus: Depreciation and amortization		262,981		243,341
Plus: Closure and post-closure accretion		9,405		4,520
Plus: Impairments and other operating items		354		1,865
Plus (less): Other expense (income), net		1,823		(3,174)
Adjustments:
Plus: Transaction-related expenses (a)		9,847		2,081
Plus: Fair value changes to equity awards (b)		1,286		373
Adjusted EBITDA	$	650,673	$	566,869

____________________

(a) Reflects the addback of acquisition-related transaction costs.

(b) Reflects fair value accounting changes associated with certain equity awards.

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Adjusted Net Income Attributable to Waste Connections and Adjusted Net Income per Diluted Share Attributable to Waste Connections

We present adjusted net income attributable to Waste Connections and adjusted net income per diluted share attributable to Waste Connections, both non-GAAP financial measures, supplementally because they are widely used by investors as valuation measures in the solid waste industry. Management uses adjusted net income attributable to Waste Connections and adjusted net income per diluted share attributable to Waste Connections as one of the principal measures to evaluate and monitor the ongoing financial performance of our operations. We provide adjusted net income attributable to Waste Connections to exclude the effects of items management believes impact the comparability of operating results between periods. Adjusted net income attributable to Waste Connections has limitations due to the fact that it excludes items that have an impact on our financial condition and results of operations. Adjusted net income attributable to Waste Connections and adjusted net income per diluted share attributable to Waste Connections are not a substitute for, and should be used in conjunction with, GAAP financial measures. Other companies may calculate these non-GAAP financial measures differently. Our adjusted net income attributable to Waste Connections and adjusted net income per diluted share attributable to Waste Connections for the three month periods ended March 31, 2024 and 2023, are calculated as follows (amounts in thousands of U.S. dollars, except per share amounts):

	Three Months Ended
	March 31,
	2024		2023
Reported net income attributable to Waste Connections	$	230,054	$	197,813
Adjustments:
Amortization of intangibles (a)		40,290		39,282
Impairments and other operating items (b)		354		1,865
Transaction-related expenses (c)		9,847		2,081
Fair value changes to equity awards (d)		1,286		373
Tax effect (e)		(13,162)		(11,024)
Adjusted net income attributable to Waste Connections	$	268,669	$	230,390
Diluted earnings per common share attributable to Waste Connections’ common shareholders:
Reported net income	$	0.89	$	0.77
Adjusted net income	$	1.04	$	0.89

____________________

(a) Reflects the elimination of the non-cash amortization of acquisition-related intangible assets.

(b) Reflects adjustments for impairments and other operating items.

(c) Reflects the addback of acquisition-related transaction costs.

(d) Reflects fair value accounting changes associated with certain equity awards.

(e) The aggregate tax effect of the adjustments in footnotes (a) through (d) is calculated based on the applied tax rates for the respective periods.

INFLATION

In the current environment, we have seen inflationary pressures resulting from higher fuel, materials and labor costs in certain markets and higher resulting third-party costs in areas such as brokerage, repairs and construction.  Consistent with industry practice, many of our contracts allow us to pass through certain costs to our customers, including increases in landfill tipping fees and, in some cases, fuel costs.  To the extent that there are decreases in fuel costs, in some cases, a portion of these reductions are passed through to customers in the form of lower fuel and material surcharges. Therefore, we believe that we should be able to increase prices to offset many cost increases that result from inflation in the ordinary course of business. However, competitive pressures or delays in the timing of rate increases under certain of our contracts may require us to absorb at least part of these cost increases, especially if cost increases exceed the average rate of inflation. Management’s estimates associated with inflation have an impact on our accounting for landfill liabilities.

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SEASONALITY

Based on historic trends, excluding any impact from an economic recession, we would expect our operating results to vary seasonally, with revenues typically lowest in the first quarter, higher in the second and third quarters and lower in the fourth quarter than in the second and third quarters. This seasonality reflects (a) the lower volume of solid waste generated during the late fall, winter and early spring because of decreased construction and demolition activities during winter months in Canada and the U.S. and (b) reduced E&P activity during harsh weather conditions, with expected fluctuation due to such seasonality between our highest and lowest quarters of approximately 10%. In addition, some of our operating costs may be higher in the winter months. Adverse winter weather conditions slow waste collection activities, resulting in higher labor and operational costs. Greater precipitation in the winter increases the weight of collected municipal solid waste, resulting in higher disposal costs, which are calculated on a per ton basis.

Item 3.Quantitative and Qualitative Disclosures About Market Risk

In the normal course of business, we are exposed to market risk, including changes in interest rates, prices of certain commodities and foreign currency exchange rate risks. We use hedge agreements to manage a portion of our risks related to interest rates. While we are exposed to credit risk in the event of non-performance by counterparties to our hedge agreements, in all cases such counterparties are highly rated financial institutions and we do not anticipate non-performance under current market conditions. We do not hold or issue derivative financial instruments for trading purposes. We monitor our hedge positions by regularly evaluating the positions at market and by performing sensitivity analyses over the unhedged variable rate debt positions.

At March 31, 2024, our derivative instruments included four interest rate swap agreements that effectively fix the interest rate on the applicable notional amounts of our variable rate debt as follows (dollars in thousands of U.S. dollars):

			Fixed		Variable
	Notional		Interest		Interest Rate		Expiration
Date Entered	Amount		Rate Paid (a)		Received	Effective Date (b)	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, we amended the reference rate in all of our outstanding interest rate swap contracts to replace One-Month LIBOR with One-Month Term SOFR and certain credit spread adjustments. We did not record any gains or losses upon the conversion of the reference rates in these interest rate swap contracts, and we believe these amendments will not have a material impact on our Condensed Consolidated Financial Statements.

Under derivatives and hedging guidance, the interest rate swap agreements are considered cash flow hedges for a portion of our variable rate debt, and we apply hedge accounting to account for these instruments. The notional amounts and all other significant terms of the swap agreements are matched to the provisions and terms of the variable rate debt being hedged.

We have performed sensitivity analyses to determine how market rate changes will affect the fair value of our unhedged floating rate debt. Such an analysis is inherently limited in that it reflects a singular, hypothetical set of assumptions. Actual market movements may vary significantly from our assumptions. Fair value sensitivity is not necessarily indicative of the ultimate cash flow or earnings effect we would recognize from the assumed market rate movements. We are exposed to cash flow risk due to changes in interest rates with respect to the unhedged floating rate balances owed at March 31, 2024 and December 31, 2023, of $1.438 billion and $1.099 billion, respectively, including floating rate debt under our Revolving Credit Agreement (or, as of December 31, 2023, the 2021 Revolving and Term Credit Agreement and the 2022 Term Loan Agreement). A one percentage point increase in interest rates on our variable-rate debt at March 31, 2024 and December 31, 2023, would decrease our annual pre-tax income by approximately $14.4 million and $11.0 million, respectively. All of our remaining debt instruments are at fixed rates, or effectively fixed under the interest rate swap agreements described above; therefore, changes in market interest rates under these instruments would not significantly impact our cash flows or results of operations, subject to counterparty default risk.

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The market price of diesel fuel is unpredictable and can fluctuate significantly.  Because of the volume of fuel we purchase each year, a significant increase in the price of fuel could adversely affect our business and reduce our operating margins.  To manage a portion of this risk, we periodically enter into fuel hedge agreements related to forecasted diesel fuel purchases, and we also enter into fixed price fuel purchase contracts.  At March 31, 2024, we had no fuel hedge agreements in place; however, we have entered into fixed price diesel fuel purchase contracts for the three months ended March 31, 2024 as described below.

For the year ending December 31, 2024, we expect to purchase approximately 89.6 million gallons of diesel fuel, of which 50.3 million gallons will be purchased at market prices and 39.3 million gallons will be purchased under our fixed price diesel fuel purchase contracts. We have performed sensitivity analyses to determine how market rate changes will affect the fair value of our unhedged, market rate diesel fuel purchases.  Such an analysis is inherently limited in that it reflects a singular, hypothetical set of assumptions.  Actual market movements may vary significantly from our assumptions.  Fair value sensitivity is not necessarily indicative of the ultimate cash flow or earnings effect we would recognize from the assumed market rate movements.  During the nine month period of April 1, 2024 to December 31, 2024, we expect to purchase approximately 37.7 million gallons of diesel fuel at market prices; therefore, a $0.10 per gallon increase in the price of diesel fuel over the remaining nine months in 2024 would decrease our pre-tax income during this period by approximately $3.8 million.

We market a variety of recyclable materials, including compost, cardboard, mixed paper, plastic containers, glass bottles and ferrous and aluminum metals. We own and operate recycling operations and market collected recyclable materials to third parties for processing before resale. Where possible, to reduce our exposure to commodity price risk with respect to recycled materials, we have adopted a pricing strategy of charging collection and processing fees for recycling volume collected from third parties. In the event of a decline in recycled commodity prices, a 10% decrease in average recycled commodity prices from the average prices that were in effect during the three months ended March 31, 2024 and 2023, would have had a $4.7 million and $3.1 million impact on revenues, respectively.

We have operations in Canada and, where significant, we have quantified and described the impact of foreign currency translation on components of income, including operating revenue and operating costs. However, the impact of foreign currency has not materially affected our results of operations in 2024 or 2023. A $0.01 change in the Canadian dollar to U.S. dollar exchange rate would impact our annual revenue and EBITDA by approximately $17.0 million and $7.0 million, respectively.

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Item 4.Controls and Procedures

As required by Rule 13a-15(b) under the U.S. Securities Exchange Act of 1934, as amended, or the Exchange Act, we carried out an evaluation, under the supervision and with the participation of our management, including our President and Chief Executive Officer and our Executive Vice President and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures (as such term is defined in Rule 13a-15(e) under the Exchange Act) as of the end of the fiscal quarter covered by this Quarterly Report on Form 10-Q. In designing and evaluating the disclosure controls and procedures, our management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and our management is required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

Based on this evaluation, our President and Chief Executive Officer and our Executive Vice President and Chief Financial Officer concluded as of March 31, 2024, that our disclosure controls and procedures were effective at the reasonable assurance level such that information required to be disclosed in our Exchange Act reports:  (1) is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms; and (2) is accumulated and communicated to our management, including our President and Chief Executive Officer and Executive Vice President and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

During the quarter ended March 31, 2024, there was no change in our internal control over financial reporting that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II – OTHER INFORMATION

Item 1.Legal Proceedings

Information regarding our legal proceedings can be found in Note 17 of our Condensed Consolidated Financial Statements included in Part I, Item 1 of this report and is incorporated herein by reference.

Item 6.Exhibits

Exhibit Number	Description of Exhibits
3.1	Articles of Amendment (incorporated by reference to Exhibit 3.1 of the Registrant’s Form 8-K filed on May 26, 2017)
3.2	Articles of Amalgamation (incorporated by reference to Exhibit 3.2 of the Registrant’s Form 8-K filed on June 7, 2016)
3.3	Articles of Amendment (incorporated by reference to Exhibit 3.1 of the Registrant’s Form 8-K filed on June 7, 2016)
3.4	By-law No. 1 of the Registrant (incorporated by reference to Exhibit 3.3 of the Registrant’s Form 8-K filed on June 7, 2016)
4.1	Indenture, dated as of November 16, 2018, by and between Waste Connections, Inc. and U.S. Bank Trust Company, National Association, as successor in interest to U.S. Bank National Association, as trustee (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed with the SEC on November 16, 2018)
4.2	Eighth Supplemental Indenture, dated as of February 21, 2024, by and between Waste Connections, Inc. and U.S. Bank Trust Company, National Association, as trustee (incorporated by reference to Exhibit 4.2 of the Registrant’s Form 8-K filed on February 21, 2024)
4.3	Revolving Credit Agreement, dated as of February 27, 2024 (incorporated by reference to Exhibit 4.1 of the Registrant’s Form 8-K filed on February 29, 2024)
31.1	Certification of Principal Executive Officer pursuant to Exchange Act Rules 13a-14(a)/15d-14(a)
31.2	Certification of Principal Financial Officer pursuant to Exchange Act Rules 13a-14(a)/15d-14(a)
32.1	Certification of Principal Executive Officer pursuant to 18 U.S.C. §1350
32.2	Certification of Principal Financial Officer pursuant to 18 U.S.C. §1350
101.INS	The instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB	XBRL Taxonomy Extension Labels Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
104	Cover Page Interactive Data File – The cover page interactive data file does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	WASTE CONNECTIONS, INC.
Date: April 25, 2024	BY:	/s/ Ronald J. Mittelstaedt
		Ronald J. Mittelstaedt
		President and Chief Executive Officer
Date: April 25, 2024	BY:	/s/ Mary Anne Whitney
		Mary Anne Whitney
		Executive Vice President and Chief Financial Officer

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EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO EXCHANGE ACT RULE 13a-14(a) OR RULE 15d-14(a) AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Ronald J. Mittelstaedt, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Waste Connections, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: April 25, 2024
	/s/ Ronald J. Mittelstaedt
	Ronald J. Mittelstaedt
	President and Chief Executive Officer (Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO EXCHANGE ACT RULE 13a-14(a) OR RULE 15d-14(a) AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Mary Anne Whitney, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Waste Connections, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: April 25, 2024
	/s/ Mary Anne Whitney
	Mary Anne Whitney
	Executive Vice President and Chief Financial Officer (Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

(Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code)

I, Ronald J. Mittelstaedt, being the duly elected and acting President and Chief Executive Officer of Waste Connections, Inc., a corporation organized under the laws of Ontario, Canada (the “Company”), hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

1. The Quarterly Report of the Company on Form 10-Q for the period ended March 31, 2024 (the “Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

9
Date: April 25, 2024	By:	/s/ Ronald J. Mittelstaedt
		Ronald J. Mittelstaedt
		President and Chief Executive Officer

The foregoing certification is being furnished solely to accompany the Report pursuant to 18 U.S.C. Section 1350, and shall not be deemed filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and shall not be deemed to be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless of any general incorporation language in such filing, except to the extent that the Company specifically incorporates it by reference.

EX-32.2

Exhibit 32.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

(Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code)

I, Mary Anne Whitney, being the duly elected and acting Executive Vice President and Chief Financial Officer of Waste Connections, Inc., a corporation organized under the laws of Ontario, Canada (the “Company”), hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge:

1. The Quarterly Report of the Company on Form 10-Q for the period ended March 31, 2024 (the “Report”), fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: April 25, 2024	By:	/s/ Mary Anne Whitney
		Mary Anne Whitney
		Executive Vice President and
		Chief Financial Officer

The foregoing certification is being furnished solely to accompany the Report pursuant to 18 U.S.C. Section 1350, and shall not be deemed filed for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, and shall not be deemed to be incorporated by reference into any filing of the Company, whether made before or after the date hereof, regardless of any general incorporation language in such filing, except to the extent that the Company specifically incorporates it by reference.

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2024	Apr. 12, 2024
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2024
Document Fiscal Year Focus	2024
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		258,021,193
Entity Central Index Key	0001318220
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q1
Amendment Flag	false

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Current assets:
Cash and equivalents	$ 111,985	$ 78,399
Accounts receivable, net of allowance for credit losses of $22,858 and $23,553 at March 31, 2024 and December 31, 2023, respectively	896,682	856,953
Prepaid expenses and other current assets	208,387	206,433
Total current assets	1,217,054	1,141,785
Restricted cash	105,683	105,639
Restricted investments	74,655	70,350
Property and equipment, net	7,827,304	7,228,331
Operating lease right-of-use assets	273,371	261,782
Goodwill	7,597,175	7,404,400
Intangible assets, net	1,877,226	1,603,541
Other assets, net	110,192	100,048
Total assets	19,082,660	17,915,876
Current liabilities:
Accounts payable	589,861	642,455
Book overdraft	14,584	14,855
Deferred revenue	370,380	355,203
Accrued liabilities	507,259	521,428
Current portion of operating lease liabilities	36,430	32,533
Current portion of contingent consideration	96,931	94,996
Current portion of long-term debt and notes payable	16,096	26,462
Total current liabilities	1,631,541	1,687,932
Long-term portion of debt and notes payable	7,795,191	6,724,771
Long-term portion of operating lease liabilities	249,419	238,440
Long-term portion of contingent consideration	20,802	20,034
Deferred income taxes	1,052,508	1,022,480
Other long-term liabilities	542,239	524,438
Total liabilities	11,291,700	10,218,095
Commitments and contingencies
Equity:
Common shares: 258,019,417 shares issued and 257,961,725 shares outstanding at March 31, 2024; 257,659,921 shares issued and 257,600,479 shares outstanding at December 31, 2023	3,279,130	3,276,661
Additional paid-in capital	272,450	284,284
Accumulated other comprehensive loss	(62,836)	(9,826)
Treasury shares: 57,692 and 59,442 shares at March 31, 2024 and December 31, 2023, respectively
Retained earnings	4,298,171	4,141,690
Total Waste Connections' equity	7,786,915	7,692,809
Noncontrolling interest in subsidiaries	4,045	4,972
Total equity	7,790,960	7,697,781
Total liabilities and equity	$ 19,082,660	$ 17,915,876

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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Statement Of Financial Position [Abstract]
Allowance for credit losses	$ 22,858	$ 23,553
Common shares, shares issued	258,019,417	257,659,921
Common shares, shares outstanding	257,961,725	257,600,479
Treasury shares	57,692	59,442

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Condensed Consolidated Statements of Net Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Revenues	$ 2,072,653	$ 1,900,503
Operating expenses:
Cost of operations	1,221,783	1,146,941
Selling, general and administrative	220,735	193,667
Depreciation	222,691	204,059
Amortization of intangibles	40,290	39,282
Impairments and other operating items	354	1,865
Operating income	366,800	314,689
Interest expense	(78,488)	(68,353)
Interest income	2,051	2,715
Other income, net	(1,823)	3,174
Income before income tax provision	288,540	252,225
Income tax provision	(59,413)	(54,389)
Net income	229,127	197,836
Less: Net income attributable to noncontrolling interests	927	(23)
Net income attributable to Waste Connections	$ 230,054	$ 197,813
Earnings per common share attributable to Waste Connections' common shareholders:
Basic	$ 0.89	$ 0.77
Diluted	$ 0.89	$ 0.77
Shares used in the per share calculations:
Basic	257,801,116	257,372,942
Diluted	258,482,473	257,988,971
Cash dividends per common share	$ 0.285	$ 0.255

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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Net income	$ 229,127	$ 197,836
Other comprehensive income (loss), before tax:
Foreign currency translation adjustment	(56,381)	1,682
Other comprehensive income (loss), before tax	(51,794)	(5,697)
Income tax expense (benefit) related to items of other comprehensive income (loss)	(1,216)	1,955
Other comprehensive income (loss), net of tax	(53,010)	(3,742)
Comprehensive income	176,117	194,094
Less: Comprehensive income attributable to noncontrolling interests	927	(23)
Comprehensive income attributable to Waste Connections	177,044	194,071
Interest Rate Swap
Other comprehensive income (loss), before tax:
Interest rate swap amounts reclassified into interest expense	(5,385)	(4,080)
Changes in fair value of interest rate swaps	$ 9,972	$ (3,299)

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Condensed Consolidated Statements of Equity - USD ($) $ in Thousands	Common Shares Deferred Compensation Plan	Common Shares Performance Shares	Common Shares	Additional Paid-In Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Shares	Retained Earnings	Noncontrolling Interests	Total
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
Beginning Balance, treasury shares at Dec. 31, 2022						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
Repurchase of common shares (shares)									0
Issuance of shares under employee share purchase plan			$ 1,841						$ 1,841
Issuance of shares under employee share purchase plan, shares			14,594						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
Cumulative effect adjustment from adoption of new accounting pronouncement			$ 3,274,564	238,484	(60,572)		3,781,519	4,969	7,238,964
Cumulative effect adjustment from adoption of new accounting pronouncement			3,276,661	284,284	(9,826)		4,141,690	4,972	7,697,781
Beginning Balances at Dec. 31, 2023			$ 3,276,661	284,284	(9,826)		4,141,690	4,972	$ 7,697,781
Beginning Balances, shares at Dec. 31, 2023			257,600,479						257,600,479
Beginning Balance, treasury shares at Dec. 31, 2023						59,442			59,442
Sale of common shares held in trust			$ 286						$ 286
Sale of common shares held in trust, shares			1,750			(1,750)
Vesting of restricted share units (shares)	19,149	153,555	329,996
Tax withholdings related to net share settlements of equity-based compensation				(30,850)					(30,850)
Tax withholdings related to net share settlements of equity-based compensation, shares			(256,512)
Equity-based compensation				19,016					$ 19,016
Exercise of warrants			97,901
Repurchase of common shares (shares)									0
Issuance of shares under employee share purchase plan			$ 2,183						$ 2,183
Issuance of shares under employee share purchase plan, shares			15,407						15,407
Cash dividends on common shares							(73,573)		$ (73,573)
Amounts reclassified into earnings, net of taxes					(3,958)				(3,958)
Changes in fair value of cash flow hedges, net of taxes					7,329				7,329
Foreign currency translation adjustment					(56,381)				(56,381)
Net income							230,054	(927)	229,127
Ending Balances at Mar. 31, 2024			$ 3,279,130	272,450	(62,836)		4,298,171	4,045	$ 7,790,960
Ending Balances, shares at Mar. 31, 2024			257,961,725						257,961,725
Ending Balance, treasury shares at Mar. 31, 2024						57,692			57,692
Cumulative effect adjustment from adoption of new accounting pronouncement			$ 3,279,130	$ 272,450	$ (62,836)		$ 4,298,171	$ 4,045	$ 7,790,960

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Cash flows from operating activities:
Net income	$ 229,127	$ 197,836
Adjustments to reconcile net income to net cash provided by operating activities:
Loss on disposal of assets and impairments	1,649	1,910
Depreciation	222,691	204,059
Amortization of intangibles	40,290	39,282
Deferred income taxes, net of acquisitions	30,395	28,229
Current period provision for expected credit losses	3,730	2,247
Amortization of debt issuance costs	4,055	1,621
Share-based compensation	21,952	18,469
Interest accretion	11,279	4,884
Adjustments to contingent consideration	0	(637)
Other	902	(2,937)
Changes in operating assets and liabilities, net of effects from acquisitions:
Net change in operating assets and liabilities, net of acquisitions	(75,761)	(52,605)
Net cash provided by operating activities	490,309	442,358
Cash flows from investing activities:
Payments for acquisitions, net of cash acquired	(1,156,422)	(144,611)
Capital expenditures for property and equipment	(169,951)	(175,786)
Proceeds from disposal of assets	1,085	1,260
Other	(9,291)	1,378
Net cash used in investing activities	(1,334,579)	(317,759)
Cash flows from financing activities:
Proceeds from long-term debt	2,353,022	336,649
Principal payments on notes payable and long-term debt	(1,350,932)	(320,027)
Payment of contingent consideration recorded at acquisition date	(11,295)	(1,319)
Change in book overdraft	(271)	5,421
Payments for cash dividends	(73,573)	(65,788)
Tax withholdings related to net share settlements of equity-based compensation	(30,850)	(22,966)
Debt issuance costs	(10,093)	0
Proceeds from issuance of shares under employee share purchase plan	2,183	1,841
Proceeds from sale of common shares held in trust	286	765
Net cash provided by (used in) financing activities	878,477	(65,424)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(577)	(54)
Net increase (decrease) in cash, cash equivalents and restricted cash	33,630	59,121
Cash, cash equivalents and restricted cash at beginning of period	184,038	181,364
Cash, cash equivalents and restricted cash at end of period	217,668	240,485
In connection with its acquisitions, the Company assumed liabilities as follows:
Payments for acquisitions, net of cash acquired	(1,156,422)	(144,611)
Liabilities assumed and notes payable issued to sellers of businesses acquired	$ 149,634	$ 34,224

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Basis of Presentation and Summary

3 Months Ended

Mar. 31, 2024

Basis of Presentation and Summary [Abstract]

Basis of Presentation and Summary

1.BASIS OF PRESENTATION AND SUMMARY

The accompanying condensed consolidated financial statements relate to Waste Connections, Inc. and its subsidiaries (the “Company”) for the three month periods ended March 31, 2024 and 2023. 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, 2023.

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Reporting Currency

3 Months Ended

Mar. 31, 2024

Reporting Currency [Abstract]

Reporting Currency

2.REPORTING CURRENCY

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.

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New Accounting Standards

3 Months Ended

Mar. 31, 2024

New Accounting Standards

New Accounting Standards

3.NEW ACCOUNTING STANDARDS

Accounting Standards Pending Adoption

Disclosure of Significant Segment Expenses and Other Segment Items.  In November 2023, the Financial Accounting Standards Board (the “FASB”) amended its existing guidance for segment reporting to require a public entity to disclose significant segment expenses and other segment items on an annual and interim basis and to provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually.  The amended guidance does not change how a public entity identifies its operating segments, aggregates them or applies the quantitative thresholds to determine its reportable segments.  The guidance is applied retrospectively to all periods presented in financial statements, unless it is impracticable.  The guidance applies to all public entities and is effective for fiscal years beginning after December 15, 2023, and for interim periods beginning after December 15, 2024.  Early adoption is permitted.  The Company does not expect the adoption of this guidance to have a material impact on its consolidated financial statements.

Additional Income Tax Disclosures.  In December 2023, the FASB issued a final standard on improvements to income tax disclosures.  The standard requires public business entities to disclose in their rate reconciliation table additional categories of information about federal, state and foreign income taxes and to provide more details about the reconciling items in some categories if the items meet a quantitative threshold.  The guidance also requires all entities to disclose

annually income taxes paid (net of refunds received) disaggregated by federal (national), state and foreign taxes and to disaggregate the information by jurisdiction based on a quantitative threshold.  The standard applies to all entities subject to income taxes.  For public business entities, the new requirements will be effective for annual periods beginning after December 15, 2024.  The guidance will be applied on a prospective basis with the option to apply the standard retrospectively.  Early adoption is permitted.  The Company does not expect the adoption of this guidance to have a material impact on its consolidated financial statements.

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Revenue

3 Months Ended

Mar. 31, 2024

Revenue [Abstract]

Revenue

4.REVENUE

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 March 31,
	2024		2023
Commercial	$	642,859	$	602,279
Residential		546,211		514,053
Industrial and construction roll off		325,990		318,315
Total collection		1,515,060		1,434,647
Landfill		353,478		343,433
Transfer		301,882		273,521
Recycling		49,025		31,301
E&P		97,408		51,759
Intermodal and other		49,541		38,212
Intercompany		(293,741)		(272,370)
Total	$	2,072,653	$	1,900,503

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 December 31, 2023 was recognized as revenue during the three months ended March 31, 2024 when the service was performed.

See Note 10 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 to five years. The Company recognizes the incremental costs of obtaining a contract as an expense when incurred if the amortization period of the asset that the Company would have recognized is one year or less. The Company had $26,102 and $25,977 of deferred sales incentives at March 31, 2024 and December 31, 2023, respectively.

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Accounts Receivable

3 Months Ended

Mar. 31, 2024

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:

	Three Months Ended March 31,
	2024		2023
Beginning balance	$	23,553	$	22,939
Current period provision for expected credit losses		3,730		2,247
Write-offs charged against the allowance		(5,728)		(5,017)
Recoveries collected		1,356		2,068
Impact of changes in foreign currency		(53)		2
Ending balance	$	22,858	$	22,239

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Landfill Accounting

3 Months Ended

Mar. 31, 2024

Landfill Accounting [Abstract]

Landfill Accounting

6.LANDFILL ACCOUNTING

At March 31, 2024, the Company’s landfills consisted of 100 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 $3,297,752 at March 31, 2024. 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 March 31, 2024, 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 32 years.  As of March 31, 2024, 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 35 years.  The estimated remaining lives of the Company’s owned landfills and landfills operated under life-of-site operating agreements range from two to 382 years, with approximately 90% of the projected annual disposal volume from landfills with remaining lives of less than 70 years.

During the three months ended March 31, 2024 and 2023, the Company expensed $62,525 and $59,055, respectively, or an average of $5.29 and $5.06 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 2024 and 2023 “layers” for final capping, closure and post-closure obligations was 5.50% for both periods. The Company’s long-term inflation rate assumption is 2.75% for each of the years ending December 31, 2024 and 2023. 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 three months ended March 31, 2024 and 2023, the Company expensed $9,356 and $4,474, respectively, or an average of $0.78 and $0.38 per ton consumed, respectively, related to final capping, closure and post-closure accretion expense. In the event that changes in an estimate for a closure and post-closure liability are associated with a significant change in facts and circumstances at a landfill or a non-operating section of a landfill, corresponding adjustments to recorded liabilities and Impairments and other operating items are made as soon as is practical.

The following is a reconciliation of the Company’s final capping, closure and post-closure liability balance from December 31, 2023 to March 31, 2024:

Final capping, closure and post-closure liability at December 31, 2023	$	522,233
Liability adjustments		(8,726)
Accretion expense associated with landfill obligations		9,356
Closure payments		(28,950)
Assumption of closure liabilities from acquisitions		48,220
Foreign currency translation adjustment		(829)
Final capping, closure and post-closure liability at March 31, 2024	$	541,304

Liability adjustments of $8,726 for the three months ended March 31, 2024, 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.  In the event that changes in an estimate for a closure and post-closure liability are associated with a significant change in facts and circumstances at a landfill or a non-operating section of a landfill, corresponding adjustments to recorded liabilities and Impairments and other operating items are made as soon as is practical.

At March 31, 2024 and December 31, 2023, $7,655 and $12,381, respectively, of the Company’s restricted cash balance and $63,697 and $59,551, respectively, of the Company’s restricted investments balance was for purposes of securing its performance of future final capping, closure and post-closure obligations.

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Acquisitions

3 Months Ended

Mar. 31, 2024

Acquisitions [Abstract]

Acquisitions

7.ACQUISITIONS

The Company acquired nine individually immaterial non-hazardous solid waste collection, transfer, recycling and disposal businesses and one E&P waste treatment and disposal business during the three months ended March 31, 2024.  The total transaction-related expenses incurred during the three months ended March 31, 2024 for these acquisitions were $9,847. These expenses are included in Selling, general and administrative expenses in the Company’s Condensed Consolidated Statements of Net Income.

The Company acquired four individually immaterial non-hazardous solid waste collection, transfer, recycling and disposal businesses during the three months ended March 31, 2023.  The total transaction-related expenses incurred during the three months ended March 31, 2023 for these acquisitions were $2,081. 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 three months ended March 31, 2024 and 2023:

	2024		2023
	Acquisitions		Acquisitions
Fair value of consideration transferred:
Cash	$	1,156,422	$	144,611
Debt assumed		64,450		17,097
		1,220,872		161,708
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts receivable		51,852		3,882
Prepaid expenses and other current assets		9,951		2,290
Restricted investments		—		5,462
Operating lease right-of-use assets		2,317		587
Property and equipment		688,906		67,201
Long-term franchise agreements and contracts		77,384		58,630
Customer lists		102,418		1,527
Permits and other intangibles		136,868		2,403
Other assets		1,617		—
Accounts payable and accrued liabilities		(4,727)		(4,159)
Current portion of operating lease liabilities		(1,515)		(53)
Deferred revenue		(11,886)		(761)
Contingent consideration		(12,012)		(6,000)
Long-term portion of operating lease liabilities		(3,857)		(534)
Other long-term liabilities		(51,187)		(4,543)
Deferred income taxes		—		(1,077)
Total identifiable net assets		986,129		124,855
Goodwill	$	234,743	$	36,853

Goodwill acquired during the three months ended March 31, 2024 and 2023, totaling $234,743 and $36,853, respectively, is expected to be deductible for tax purposes. The fair value of acquired working capital related to nine individually immaterial acquisitions completed during the twelve months ended March 31, 2024, 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 nine acquisitions are not expected to be material to the Company’s financial position. The adjustments recorded during the three months ended March 31, 2024 relating to finalizing the acquired working capital for the individually immaterial acquisitions completed during the twelve months ended March 31, 2024 were not material to the Company’s financial position.

The gross amount of trade receivables due under contracts acquired during the three months ended March 31, 2024, was $52,335, of which $483 was expected to be uncollectible. The gross amount of trade receivables due under contracts acquired during the three months ended March 31, 2023, was $4,164, of which $282 was expected to be uncollectible. The Company did not acquire any other class of receivable as a result of the acquisition of these businesses.

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Intangible Assets, Net

3 Months Ended

Mar. 31, 2024

Intangible Assets, Net [Abstract]

Intangible Assets, Net

8.INTANGIBLE ASSETS, NET

Intangible assets, exclusive of goodwill, consisted of the following at March 31, 2024:

	Gross				Accumulated		Net
	Carrying		Accumulated		Impairment		Carrying
	Amount		Amortization		Loss		Amount
Finite-lived intangible assets:
Long-term franchise agreements and contracts	$	1,035,243	$	(359,900)	$	—	$	675,343
Customer lists		905,627		(619,901)		—		285,726
Permits and other		919,818		(144,490)		(40,784)		734,544
		2,860,688		(1,124,291)		(40,784)		1,695,613
Indefinite-lived intangible assets:
Solid waste collection and transportation permits		181,613		—		—		181,613
Intangible assets, exclusive of goodwill	$	3,042,301	$	(1,124,291)	$	(40,784)	$	1,877,226

The weighted-average amortization period of long-term franchise agreements and contracts acquired during the three months ended March 31, 2024 was 12.1 years. The weighted-average amortization period of customer lists acquired during the three months ended March 31, 2024 was 10.1 years.  The weighted-average amortization period of finite-lived permits and other acquired during the three months ended March 31, 2024 was 40.0 years.

Intangible assets, exclusive of goodwill, consisted of the following at December 31, 2023:

	Gross				Accumulated		Net
	Carrying		Accumulated		Impairment		Carrying
	Amount		Amortization		Loss		Amount
Finite-lived intangible assets:
Long-term franchise agreements and contracts	$	960,033	$	(343,099)	$	—	$	616,934
Customer lists		806,257		(606,192)		—		200,065
Permits and other		784,905		(139,192)		(40,784)		604,929
		2,551,195		(1,088,483)		(40,784)		1,421,928
Indefinite-lived intangible assets:
Solid waste collection and transportation permits		181,613		—		—		181,613
Intangible assets, exclusive of goodwill	$	2,732,808	$	(1,088,483)	$	(40,784)	$	1,603,541

Estimated future amortization expense for the next five years relating to finite-lived intangible assets owned as of March 31, 2024 is as follows:

For the year ending December 31, 2024	$	172,784
For the year ending December 31, 2025	$	155,871
For the year ending December 31, 2026	$	136,081
For the year ending December 31, 2027	$	118,791
For the year ending December 31, 2028	$	105,796

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Long-Term Debt

3 Months Ended

Mar. 31, 2024

Long-Term Debt [Abstract]

Long-Term Debt

9.LONG-TERM DEBT

The following table presents the Company’s long-term debt at March 31, 2024 and December 31, 2023:

	March 31,		December 31,
	2024		2023
Revolving Credit Agreement, bearing interest ranging from 6.30% to 6.43% (a)	$	2,237,794	$	—
Revolver under 2021 Revolving and Term Credit Agreement, bearing interest ranging from 6.40% to 8.50% (b)		—		453,245
Term loan under 2021 Revolving and Term Credit Agreement, bearing interest at 6.50% (b)		—		650,000
Term loan under 2022 Term Loan Agreement, bearing interest at 6.44% (b)		—		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
5.00% Senior Notes due 2034		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 2028 to 2036 (a)		37,124		48,774
Finance leases, bearing interest ranging from 1.89% to 5.07%, with lease expiration dates ranging from 2026 to 2029 (a)		9,292		10,034
		7,884,210		6,812,053
Less – current portion		(16,096)		(26,462)
Less – unamortized debt discount and issuance costs		(72,923)		(60,820)
Long-term portion of debt and notes payable	$	7,795,191	$	6,724,771

____________________

(a) Interest rates represent the interest rates at March 31, 2024.

(b) Interest rates represent the interest rates at December 31, 2023.

2021 Revolving Credit and Term Loan Agreement

 On February 27, 2024, the Company used a portion of the proceeds from borrowings under the Revolving Credit Agreement (as defined and described below) to (i) prepay the amounts outstanding under that certain Second Amended and Restated Revolving Credit and Term Loan Agreement, dated as of July 30, 2021 (as amended, restated, supplemented or otherwise modified from time to time, the “2021 Revolving and Term Credit Agreement”), among the Company, as borrower, Bank of America, N.A., acting through its Canada Branch, as the global agent, the swing line lender and a letter of credit issuer, Bank of America, N.A., as the U.S. agent and a letter of credit issuer, and the lenders and any other financial institutions from time to time party thereto and (ii) terminate the 2021 Revolving and Term Credit Agreement and the loan documents associated therewith.

2022 Term Loan Agreement

On February 27, 2024, the Company used a portion of the proceeds from borrowings under the Revolving Credit Agreement to (i) prepay the amounts outstanding under that certain Term Loan Agreement, dated as of October 31, 2022

(as amended, restated, supplemented or otherwise modified from time to time, the “2022 Term Loan Agreement”), among the Company, as borrower, Bank of America, N.A., as administrative agent, and the lenders and any other financial institutions from time to time party thereto and (ii) terminate the 2022 Term Loan Agreement and the loan documents associated therewith.

Revolving Credit Agreement

On February 27, 2024, the Company, as borrower, Bank of America, N.A., acting through its Canada Branch, as the global agent, the swing line lender, and a letter of credit issuer, Bank of America, N.A., as the U.S. agent and a letter of credit issuer, and the other lenders from time to time party thereto (the “Lenders”) entered into that certain Revolving Credit Agreement (as amended, restated, supplemented or otherwise modified from time to time, the “Revolving Credit Agreement”), pursuant to which the Lenders made loans and other credit extensions to the Company under a revolving credit facility.

Details of the Revolving Credit Agreement at March 31, 2024 and details of the 2021 Revolving and Term Credit Agreement at December 31, 2023 are as follows:

	March 31,			December 31,
	2024			2023
Revolver
Available	$	723,386		$	1,357,013
Letters of credit outstanding	$	38,820		$	39,742
Total amount drawn, as follows:	$	2,237,794		$	453,245
Amount drawn – U.S. Term SOFR rate loan	$	1,150,000		$	90,000
Interest rate applicable – U.S. Term SOFR rate loan		6.43	%		6.46	%
Amount drawn – U.S. Term SOFR rate loan	$	45,000		$	150,000
Interest rate applicable – U.S. Term SOFR rate loan		6.43	%		6.50	%
Amount drawn – U.S. base rate loan	$	—		$	28,000
Interest rate applicable – U.S. base rate loan		—	%		8.50	%
Amount drawn – Canadian Term CORRA loan	$	987,444		$	—
Interest rate applicable - Canadian term CORRA loan		6.30	%		—	%
Amount drawn – Canadian Term CORRA loan	$	55,350		$	—
Interest rate applicable - Canadian term CORRA loan		6.31	%		—	%
Amount drawn – Canadian prime rate loan	$	—		$	15,122
Interest rate applicable - Canadian prime rate loan		—	%		7.20	%
Amount drawn – Canadian bankers’ acceptance	$	—		$	153,111
Interest rate applicable – Canadian bankers’ acceptance		—	%		6.46	%
Amount drawn – Canadian bankers’ acceptance	$	—		$	17,012
Interest rate applicable – Canadian bankers’ acceptance		—	%		6.40	%
Commitment – rate applicable		0.09	%		0.09	%
Term loan
Amount drawn – U.S. Term SOFR rate loan	$	—		$	650,000
Interest rate applicable – U.S. Term SOFR rate loan		—	%		6.50	%

In addition to the $38,820 of letters of credit at March 31, 2024 issued and outstanding under the Revolving Credit Agreement, the Company has issued and outstanding letters of credit totaling $102,960 under facilities other than the Revolving Credit Agreement.

Pursuant to the terms and conditions of the Revolving Credit Agreement, the Lenders committed to provide the revolving credit facility as set forth above. The Revolving Credit Agreement (i) has a scheduled maturity date of February 27, 2029 (subject to certain extension mechanics therein by which the Company may request two additional one-year maturity date extensions), (ii) provides for revolving advances up to an aggregate principal amount of $3,000,000 at any one time outstanding (subject to satisfaction of certain conditions at the time advances are made) and (iii) provides for, at the Company’s discretion, flexibility for an uncommitted upsize of the aggregate principal amount by up to $1,000,000 (to an aggregate principal amount of up to $4,000,000). The Revolving Credit Agreement provides for letters of credit in an aggregate amount not to exceed $320,000 and swing line loans in an aggregate amount not to exceed $100,000, in each case, to be issued at the request of the Company subject to the terms therein and with such sublimits included in the aggregate commitments of the credit facility.

Advances are available under the Revolving Credit Agreement in U.S. dollars and Canadian dollars. Interest accrues on revolving advances, at the Company’s option, (i) at a term rate based on the Secured Overnight Financing Rate as administered by the Federal Reserve Bank of New York (or a successor administrator thereof) (“term SOFR”) or a base rate for U.S. dollar borrowings, plus an applicable margin, and (ii) at a term rate based on the Canadian Overnight Repo Rate Average as administered and published by the Bank of Canada (or a successor administrator thereof) (“term CORRA”) or at the Canadian prime rate for Canadian dollar borrowings, plus an applicable margin. Interest for term SOFR loans has a credit spread adjustment of 0.10% for all applicable interest periods and interest for term CORRA loans has a credit spread adjustment of 0.29547% for an interest period of one month’s duration and 0.32138% for an interest period of three months’ duration. Fees for letters of credit in U.S. dollars and Canadian dollars are also based on the applicable margin. The applicable margin used in connection with interest rates and fees is based on the debt rating of the Company’s public non-credit-enhanced, senior unsecured long-term debt (the “Debt Rating”). The applicable margin for term SOFR loans, term CORRA loans and letter of credit fees ranges from 0.750% to 1.250%, and the applicable margin for U.S. base rate loans, Canadian prime rate loans and swing line loans ranges from 0.00% to 0.250%. The Company will also pay a commitment fee based on the Debt Rating on the actual daily unused amount of the aggregate revolving commitments ranging from 0.065% to 0.150%.

Borrowings under the Revolving Credit Agreement are unsecured and there are no subsidiary guarantors under the Revolving Credit Agreement. The Revolving Credit Agreement contains customary representations, warranties, covenants and events of default, including, among others, a change of control event of default and limitations on the incurrence of indebtedness and liens, new lines of business, mergers, transactions with affiliates and burdensome agreements. During the continuance of an event of default, the Lenders may take a number of actions, including, among others, declaring the entire amount then outstanding under the Revolving Credit Agreement to be due and payable.

The Revolving Credit Agreement includes a financial covenant limiting, as of the last day of each fiscal quarter, the ratio of (a) Consolidated Total Funded Debt (as defined in the Revolving Credit Agreement) as of such date to (b) Consolidated EBITDA (as defined in the Revolving Credit Agreement), measured for the preceding 12 months, to not more than 3.75 to 1.00 (or 4.25 to 1.00 during material acquisition periods, subject to certain limitations). As of March 31, 2024, the Company was in compliance with all applicable covenants in the Revolving Credit Agreement.

Senior Notes

On February 21, 2024, the Company completed an underwritten public offering (the “Offering”) of $750,000 aggregate principal amount of its 5.00% Senior Notes due 2034 (the “2034 Senior Notes”). The Company issued the 2034 Senior Notes under the Indenture, dated as of November 16, 2018 (the “Base Indenture”), by and between the Company and U.S. Bank Trust Company, National Association, as successor in interest to U.S. Bank National Association, as trustee (the “Trustee”), as supplemented by the Eighth Supplemental Indenture, dated as of February 21, 2024 (the “Supplemental Indenture” and the Base Indenture as so supplemented, the “Indenture”).

The Company will pay interest on the 2034 Senior Notes on March 1 and September 1 of each year, beginning September 1, 2024, and the 2034 Senior Notes will mature on March 1, 2034. The 2034 Senior Notes are the Company’s senior unsecured obligations, ranking equally in right of payment with its other existing and future unsubordinated debt and senior to any of its future subordinated debt. The 2034 Senior Notes will not be guaranteed by any of the Company’s subsidiaries.

The Company may, prior to December 1, 2033 (three months before the maturity date) (the “Par Call Date”), redeem some or all of the 2034 Senior Notes, at any time and from time to time, at a redemption price equal to the greater of 100% of the principal amount of the 2034 Senior Notes redeemed, or the sum of the present values of the remaining scheduled payments of principal and interest on the 2034 Senior Notes redeemed discounted to the redemption date (assuming the 2034 Senior Notes matured on the Par Call Date), plus, in either case, accrued and unpaid interest thereon to the redemption date. Commencing on December 1, 2033 (three months before the maturity date), the Company may redeem some or all of the 2034 Senior Notes, at any time and from time to time, at a redemption price equal to the principal amount of the 2034 Senior Notes being redeemed plus accrued and unpaid interest thereon to the redemption date.

Under certain circumstances, the Company may become obligated to pay additional amounts (the “Additional Amounts”) with respect to the 2034 Senior Notes to ensure that the net amounts received by each holder of the 2034 Senior Notes will not be less than the amount such holder would have received if withholding taxes or deductions were not incurred on a payment under or with respect to the 2034 Senior Notes. If such payment of Additional Amounts are a result of a change in the laws or regulations, including a change in any official position, the introduction of an official position or a holding by a court of competent jurisdiction, of any jurisdiction from or through which payment is made by or on behalf of the 2034 Senior Notes having power to tax, and the Company cannot avoid such payments of Additional Amounts through reasonable measures, then the Company may redeem the 2034 Senior Notes then outstanding at a redemption price equal to 100% of the principal amount thereof, plus accrued and unpaid interest, if any, to, but excluding, the redemption date (subject to the right of holders of record on the relevant record date to receive interest due on an interest payment date that is on or prior to the redemption date).

If the Company experiences certain kinds of changes of control, each holder of the 2034 Senior Notes may require the Company to purchase all or a portion of the 2034 Senior Notes for cash at a price equal to 101% of the aggregate principal amount of such 2034 Senior Notes, plus accrued and unpaid interest, if any, to, but excluding, the purchase date.

The covenants in the Indenture include limitations on liens, sale-leaseback transactions and mergers and sales of all or substantially all of the Company’s assets. The Indenture also includes customary events of default with respect to the 2034 Senior Notes.

 Upon an Event of Default, the principal of and accrued and unpaid interest on all the 2034 Senior Notes may be declared to be due and payable by the Trustee or the holders of not less than 25% in principal amount of the outstanding 2034 Senior Notes. Upon such a declaration, such principal and accrued interest on all of the 2034 Senior Notes will be due and payable immediately. In the case of an Event of Default resulting from certain events of bankruptcy, insolvency or reorganization, the principal (or such specified amount) of and accrued and unpaid interest, if any, on all outstanding 2034 Senior Notes will become and be immediately due and payable without any declaration or other act on the part of the Trustee or any holder of the 2034 Senior Notes. Under certain circumstances, the holders of a majority in principal amount of the outstanding 2034 Senior Notes may rescind any such acceleration with respect to the 2034 Senior Notes and its consequences.

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Segment Reporting

3 Months Ended

Mar. 31, 2024

Segment Reporting [Abstract]

Segment Reporting

10.SEGMENT REPORTING

The Company’s revenues are generated primarily 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.

For the three months ended March 31, 2024, the Company managed its operations through the following six geographic solid waste operating segments: Western, Southern, Central, Eastern, Canada and MidSouth.  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.  Certain corporate or regional overhead expense allocations may affect comparability of the segment information presented herein on a period-over-period basis.

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 10.

Summarized financial information concerning the Company’s reportable segments for the three months ended March 31, 2024 and 2023, is shown in the following tables:

Three Months Ended			Intercompany		Reported		Segment
March 31, 2024	Revenue		Revenue(b)		Revenue		EBITDA(c)
Western	$	476,703	$	(54,454)	$	422,249	$	113,050
Southern		473,953		(55,007)		418,946		128,412
Central		403,086		(42,159)		360,927		125,922
Eastern		431,969		(71,906)		360,063		95,016
Canada		307,346		(26,984)		280,362		121,361
MidSouth		273,337		(43,231)		230,106		57,507
Corporate(a)		—		—		—		(11,133)
	$	2,366,394	$	(293,741)	$	2,072,653	$	630,135

Three Months Ended			Intercompany		Reported		Segment
March 31, 2023	Revenue		Revenue(b)		Revenue		EBITDA(c)
Western	$	444,796	$	(48,957)	$	395,839	$	110,689
Southern		451,000		(51,107)		399,893		121,914
Central		383,525		(43,540)		339,985		115,756
Eastern		388,797		(59,669)		329,128		73,275
Canada		253,670		(26,514)		227,156		82,984
MidSouth		251,085		(42,583)		208,502		57,731
Corporate(a)		—		—		—		(2,454)
	$	2,172,873	$	(272,370)	$	1,900,503	$	559,895

____________________

(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 generally 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 March 31, 2024 and December 31, 2023, were as follows:

	March 31,		December 31,
	2024		2023
Western	$	3,434,367	$	3,432,529
Southern		3,500,113		3,501,953
Central		2,793,648		2,811,016
Eastern		3,281,517		3,228,244
Canada		3,625,769		2,794,795
MidSouth		1,991,424		1,705,180
Corporate		455,822		442,159
Total Assets	$	19,082,660	$	17,915,876

The following tables show changes in goodwill during the three months ended March 31, 2024 and 2023, by reportable segment:

	Western		Southern		Central		Eastern		Canada		MidSouth		Total
Balance as of December 31, 2023	$	779,455	$	1,559,703	$	1,008,500	$	1,587,491	$	1,723,068	$	746,183	$	7,404,400
Goodwill acquired		5,653		1,322		—		37,289		91,389		98,665		234,318
Goodwill acquisition adjustments		—		—		425		—		—		—		425
Impact of changes in foreign currency		—		—		—		—		(41,968)		—		(41,968)
Balance as of March 31, 2024	$	785,108	$	1,561,025	$	1,008,925	$	1,624,780	$	1,772,489	$	844,848	$	7,597,175

	Western		Southern		Central		Eastern		Canada		MidSouth		Total
Balance as of December 31, 2022	$	732,335	$	1,547,894	$	1,003,470	$	1,189,111	$	1,684,670	$	744,817	$	6,902,297
Goodwill acquired		30,703		—		397		3,440		—		3,249		37,789
Goodwill acquisition adjustments		—		(647)		—		—		(289)		—		(936)
Impact of changes in foreign currency		—		—		—		—		1,417		—		1,417
Balance as of March 31, 2023	$	763,038	$	1,547,247	$	1,003,867	$	1,192,551	$	1,685,798	$	748,066	$	6,940,567

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
	March 31,
	2024		2023
Western segment EBITDA	$	113,050	$	110,689
Southern segment EBITDA		128,412		121,914
Central segment EBITDA		125,922		115,756
Eastern segment EBITDA		95,016		73,275
Canada segment EBITDA		121,361		82,984
MidSouth segment EBITDA		57,507		57,731
Subtotal reportable segments		641,268		562,349
Unallocated corporate overhead		(11,133)		(2,454)
Depreciation		(222,691)		(204,059)
Amortization of intangibles		(40,290)		(39,282)
Impairments and other operating items		(354)		(1,865)
Interest expense		(78,488)		(68,353)
Interest income		2,051		2,715
Other income (expense), net		(1,823)		3,174
Income before income tax provision	$	288,540	$	252,225

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Derivative Financial Instruments

3 Months Ended

Mar. 31, 2024

Derivative Financial Instruments [Abstract]

Derivative Financial Instruments

11.DERIVATIVE FINANCIAL INSTRUMENTS

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 Revolving Credit Agreement. The Company’s strategy to achieve that objective involves entering into interest rate swaps. The interest rate swaps outstanding at March 31, 2024 were specifically designated to the Revolving Credit Agreement and accounted for as cash flow hedges.

At March 31, 2024, 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 March 31, 2024, 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)	$	18,500	Accrued liabilities	$	—
	Other assets, net		8,874
Total derivatives designated as cash flow hedges		$	27,374		$	—

____________________

(a)Represents the estimated amount of the existing unrealized gains on interest rate swaps at March 31, 2024 (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, 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	$	15,842	Accrued liabilities	$	—
	Other assets, net		6,945
Total derivatives designated as cash flow hedges		$	22,787		$	—

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 months ended March 31, 2024 and 2023:

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
	March 31,					March 31,
	2024		2023			2024		2023
Interest rate swaps	$	7,329	$	(2,425)	Interest expense	$	(3,958)	$	(2,999)

____________________

(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 15 for further discussion on the impact of the Company’s hedge accounting to its consolidated comprehensive income (loss) and AOCIL.

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Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

12.FAIR VALUE OF FINANCIAL INSTRUMENTS

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 March 31, 2024 and December 31, 2023, 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 March 31, 2024 and December 31, 2023, 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 March 31, 2024 and December 31, 2023, are as follows:

	Carrying Value at				Fair Value (a) at
	March 31,		December 31,		March 31,		December 31,
	2024		2023		2024		2023
4.25% Senior Notes due 2028	$	500,000	$	500,000	$	488,300	$	496,800
3.50% Senior Notes due 2029	$	500,000	$	500,000	$	470,750	$	478,350
2.60% Senior Notes due 2030	$	600,000	$	600,000	$	532,020	$	539,460
2.20% Senior Notes due 2032	$	650,000	$	650,000	$	533,325	$	543,725
3.20% Senior Notes due 2032	$	500,000	$	500,000	$	439,100	$	450,200
4.20% Senior Notes due 2033	$	750,000	$	750,000	$	706,275	$	729,600
5.00% Senior Notes due 2034	$	750,000	$	—	$	741,975	$	—
3.05% Senior Notes due 2050	$	500,000	$	500,000	$	341,350	$	362,600
2.95% Senior Notes due 2052	$	850,000	$	850,000	$	568,990	$	601,460

____________________

(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 14.

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Net Income Per Share Information

3 Months Ended

Mar. 31, 2024

Net Income Per Share Information [Abstract]

Net Income Per Share Information

13.NET INCOME PER SHARE INFORMATION

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 months ended March 31, 2024 and 2023:

	Three Months Ended
	March 31,
	2024		2023
Numerator:
Net income attributable to Waste Connections for basic and diluted earnings per share	$	230,054	$	197,813
Denominator:
Basic shares outstanding		257,801,116		257,372,942
Dilutive effect of equity-based awards		681,357		616,029
Diluted shares outstanding		258,482,473		257,988,971

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Fair Value Measurements

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

Fair Value Measurements

14.FAIR VALUE MEASUREMENTS

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 March 31, 2024 and December 31, 2023, 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 March 31, 2024 and December 31, 2023, were as follows:

	Fair Value Measurement at March 31, 2024 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	$	27,374	$	—	$	27,374	$	—
Restricted cash	$	103,773	$	103,773	$	—	$	—
Restricted investments	$	76,929	$	—	$	76,929	$	—
Contingent consideration	$	(117,733)	$	—	$	—	$	(117,733)

	Fair Value Measurement at December 31, 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	$	22,787	$	—	$	22,787	$	—
Restricted cash	$	105,639	$	105,639	$	—	$	—
Restricted investments	$	70,658	$	—	$	70,658	$	—
Contingent consideration	$	(115,030)	$	—	$	—	$	(115,030)

The following table summarizes the changes in the fair value for Level 3 liabilities related to contingent consideration for the three months ended March 31, 2024 and 2023:

	Three Months Ended March 31,
	2024		2023
Beginning balance	$	115,030	$	81,415
Contingent consideration recorded at acquisition date		12,012		6,000
Payment of contingent consideration recorded at acquisition date		(11,295)		(1,319)
Adjustments to contingent consideration		—		(637)
Interest accretion expense		1,986		363
Ending balance	$	117,733	$	85,822

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Other Comprehensive Income (Loss)

3 Months Ended

Mar. 31, 2024

Other Comprehensive Income (Loss) [Abstract]

Other Comprehensive Income (Loss)

15.OTHER COMPREHENSIVE INCOME (LOSS)

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 months ended March 31, 2024 and 2023 are as follows:

	Three Months Ended March 31, 2024
	Gross		Tax Effect		Net of Tax
Interest rate swap amounts reclassified into interest expense	$	(5,385)	$	1,427	$	(3,958)
Changes in fair value of interest rate swaps		9,972		(2,643)		7,329
Foreign currency translation adjustment		(56,381)		—		(56,381)
	$	(51,794)	$	(1,216)	$	(53,010)

	Three Months Ended March 31, 2023
	Gross		Tax Effect		Net of Tax
Interest rate swap amounts reclassified into interest expense	$	(4,080)	$	1,081	$	(2,999)
Changes in fair value of interest rate swaps		(3,299)		874		(2,425)
Foreign currency translation adjustment		1,682		—		1,682
	$	(5,697)	$	1,955	$	(3,742)

A rollforward of the amounts included in AOCIL, net of taxes, for the three months ended March 31, 2024 and 2023, is as follows:

			Foreign		Accumulated
			Currency		Other
	Interest		Translation		Comprehensive
	Rate Swaps		Adjustment		Income (Loss)
Balance at December 31, 2023	$	16,749	$	(26,575)	$	(9,826)
Amounts reclassified into earnings		(3,958)		—		(3,958)
Changes in fair value		7,329		—		7,329
Foreign currency translation adjustment		—		(56,381)		(56,381)
Balance at March 31, 2024	$	20,120	$	(82,956)	$	(62,836)

			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		(2,999)		—		(2,999)
Changes in fair value		(2,425)		—		(2,425)
Foreign currency translation adjustment		—		1,682		1,682
Balance at March 31, 2023	$	17,954	$	(78,526)	$	(60,572)

See Note 11 for further discussion on the Company’s derivative instruments.

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Shareholders' Equity

3 Months Ended

Mar. 31, 2024

Shareholders' Equity [Abstract]

Shareholders' Equity

16.SHAREHOLDERS’ EQUITY

Share-Based Compensation

Restricted Share Units

A summary of activity related to restricted share units (“RSUs”) during the three-month period ended March 31, 2024, is presented below:

	Unvested Shares
Outstanding at December 31, 2023	936,267
Granted	361,108
Forfeited	(16,114)
Vested and issued	(329,996)
Outstanding at March 31, 2024	951,265

The weighted average grant-date fair value per share for the common shares underlying the RSUs granted during the three-month period ended March 31, 2024 was $164.63.

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 March 31, 2024 and 2023, the Company had 29,980 and 62,201 vested deferred RSUs outstanding, respectively.

Performance-Based Restricted Share Units

A summary of activity related to performance-based restricted share units (“PSUs”) during the three-month period ended March 31, 2024, is presented below:

	Unvested Shares
Outstanding at December 31, 2023	259,532
Granted	113,166
Vested and issued	(153,555)
Outstanding at March 31, 2024	219,143

During the three months ended March 31, 2024, 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, 2026. 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 three-month period ended March 31, 2024 was $138.29.

Deferred Share Units

A summary of activity related to deferred share units (“DSUs”) during the three-month period ended March 31, 2024, is presented below:

	Vested Shares
Outstanding at December 31, 2023	30,481
Granted	3,363
Outstanding at March 31, 2024	33,844

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 three-month period ended March 31, 2024 was $167.56.

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 or other distribution events. A summary of activity related to Progressive Waste RSUs during the three-month period ended March 31, 2024, is presented below:

Outstanding at December 31, 2023	51,812
Cash settled	(1,750)
Outstanding at March 31, 2024	50,062

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.

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 15,407 of the Company’s common shares for $2,183 during the three months ended March 31, 2024.  Under the ESPP, employees purchased 14,594 of the Company’s common shares for $1,841 during the three months ended March 31, 2023.

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, any share buyback taxes applicable and overall market conditions. All common shares purchased under the NCIB shall be immediately cancelled following their repurchase.

For each of the three months ended March 31, 2024 and 2023, the Company did not repurchase any common shares pursuant to the NCIB in effect during that period.  As of March 31, 2024, the maximum number of shares available for repurchase under the current NCIB was 12,881,534.

Cash Dividend

In October 2023, the Company announced that its Board of Directors increased its regular quarterly cash dividend by $0.03, from $0.255 to $0.285 per Company common share. Cash dividends of $73,573 and $65,788 were paid during the three months ended March 31, 2024 and 2023, respectively.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2024

Commitments and Contingencies [Abstract]

Commitments and Contingencies

17.COMMITMENTS AND CONTINGENCIES

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 March 31, 2024, 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). On December 19, 2023, 52 plaintiffs filed a mass action in the federal district court of the Eastern District of Louisiana, Areceneaux v. Louisiana Regional Landfill Company, et al. The complaint is substantially identical to the consolidated Addison action (which together with

Areceneaux now totals 593 plaintiffs), asserting the same causes of action against the same defendants, but was filed by a new law firm. The Company and Aptim were served on March 21, 2024.

The putative class actions and the Addison and Areceneaux mass actions assert claims for damages from odors allegedly emanating from the JP Landfill. The consolidated putative class action complaint alleges that the JP Landfill released “noxious odors” into the plaintiffs’ properties and the surrounding community and asserts a range of liability theories—nuisance, negligence (since dismissed), and strict liability—against all defendants. The putative class is described currently as Jefferson Parish residents suffering an injury as a result of exposure to odors from the Landfill, who live in a delineated area that expands roughly five miles from the Landfill in a northerly and easterly direction. The putative class plaintiffs propose that a class be certified on liability and allocation issues and that specific causation be left for individual determination. Following the completion of fact and expert discovery, the putative class plaintiffs will be able to file an amended motion for class certification. The putative class plaintiffs seek unspecified damages. The Addison and Areceneaux plaintiffs assert causes of action for nuisance, negligence, and (with respect to the Parish) unconstitutional takings under the Louisiana Constitution; on behalf of two plaintiffs, the Addison complaint also asserts causes of action for wrongful death and survivorship.

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 plaintiffs’ claims of diminution of property value were put on a separate track from these damages and not addressed.

After the general causation decision, the Court entered a case management order on April 17, 2023 that scheduled a trial of a subset of 13 Addison plaintiffs’ cases on the merits, prior to class certification being determined as to the putative class case. The Company objected to and opposed that sequence by motion, which the Court denied.

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. On August 24, 2023 the Fifth Circuit denied the Company’s petition for a writ of mandamus. Following the Fifth Circuit’s decision, 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 plaintiffs on August 12, 2024.

The Company has already obtained dismissal of approximately one third of the original Addison plaintiffs, and believes it has defenses to the merits of the Addison and Areceneaux actions, including specific causation issues due to other odor sources in the area. The Company also believes it has defenses to certification of the putative class actions. The Company is continuing to vigorously defend itself in these lawsuits; however, at this time, the Company is not able to determine the likelihood of any outcome regarding the underlying claims, including the allocation of any potential liability among the Company, the Parish, and Aptim Corporation.

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 2.5 million tons of materials for disposal and beneficial use in 2023.  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, and an addendum to CCL’s environmental impact report in accordance with the California Environmental Quality Act on January 12, 2024.  Upon completion of review by the County, the CUP modification application will be scheduled for a hearing before the Los Angeles County Regional Planning Commission. 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.

Elevated Temperature Landfill Event

In 2023, the Company’s subsidiary, Chiquita Canyon, LLC (“CCL”), began receiving notices of violation from regulatory agencies for odors and other impacts that CCL’s retained expert consultants in Elevated Temperature Landfill (“ETLF”) events have attributed to an ETLF event that is occurring in a lined, non-active area of the Chiquita Canyon Landfill (the “CC Landfill”).

Beginning in May 2023, CCL received notices of violation (“NOVs”) from the South Coast Air Quality Management District (“SCAQMD”) for alleged violations of Section 41700 of the California Health & Safety Code and SCAQMD Rule 402 based on complaints from the public of odors from the CC Landfill, which SCAQMD inspectors stated that they verified. Each Rule 402 NOV alleges the CC Landfill is “discharging such quantities of air contaminants to cause injury, detriment, nuisance or annoyance to a considerable number of persons.”

Since May 2023, CCL has received approximately 163 NOVs for alleged violations of SCAQMD Rule 402. CCL has also received seven additional NOVs from SCAQMD alleging violations of other SCAQMD rules and CCL’s Title V permit. The majority of these additional NOVs appear related to the increase in liquids and landfill gas caused by the ETLF event.

On August 15, 2023, SCAQMD petitioned its Hearing Board for an Order for Abatement in Hearing Board Case No. 6177-4 to address the Rule 402 NOVs issued by SCAQMD inspectors as a result of the ETLF event. SCAQMD and CCL negotiated a Stipulated Order for Abatement (the “Stipulated Order”), which was issued by the Hearing Board on September 6, 2023. Modifications to the Stipulated Order were approved by the Hearing Board after hearings on January 16 and 17, 2024, and March 21, 2024. The modified Stipulated Order contains 72 conditions. A status and modification hearing is scheduled for April 24 and 25, 2024.  

On February 15, 2024, CCL received a Summary of Violations (“SOV”) from the Department of Toxic Substances Control (“DTSC”). The SOV alleges violations of California’s hazardous waste control laws and their implementing regulations. Specifically, the SOV alleges five class I violations: four alleged violations of various laws and regulations related to one December 27, 2023 offsite shipment of leachate, a grab sample of which tested above a regulatory threshold, that was shipped to a non-hazardous waste treatment and disposal facility; and one alleged violation of 22 CCR § 66265.31

for “fail[ing] to minimize the possibility of releases of hazardous waste or hazardous waste constituents to air, soil, or surface water which could threaten human health or the environment.”

On March 29, 2024, CCL received a second SOV from DTSC, again alleging violations of the California hazardous waste control laws and their implementing regulations. Specifically, the SOV alleges three class 1 violations: an additional alleged violation of 22 CCR § 66265.31; and two alleged violations of section 25189.2(c) of the Health & Safety Code for allegedly “dispos[ing], or caus[ing] the disposal of, a hazardous or extremely hazardous waste at a point that is not authorized” in two separate incidents.

CCL has submitted full responses to each SOV.

At this time, CCL is not able to determine the likely penalties that the regulatory agencies will seek for these violations, but they could be substantial. CCL also is incurring substantial costs in conjunction with efforts to address the ETLF event and any related impacts, including attendant air emissions, and to manage the increased production and changing composition of the liquids. At this time, the Company is not able to determine the likelihood of any outcome of the resolution of the SCAQMD NOVs or the DTSC SOVs, including the amount of penalties.

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Subsequent Events

3 Months Ended

Mar. 31, 2024

Subsequent Events [Abstract]

Subsequent Events

18.SUBSEQUENT EVENT

On April 24, 2024, the Company announced that its Board of Directors approved a regular quarterly cash dividend of $0.285 per Company common share. The dividend will be paid on May 23, 2024, to shareholders of record on the close of business on May 8, 2024.

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New Accounting Standards (Policy)

3 Months Ended

Mar. 31, 2024

New Accounting Standards

New Accounting Pronouncements

Accounting Standards Pending Adoption

Disclosure of Significant Segment Expenses and Other Segment Items.  In November 2023, the Financial Accounting Standards Board (the “FASB”) amended its existing guidance for segment reporting to require a public entity to disclose significant segment expenses and other segment items on an annual and interim basis and to provide in interim periods all disclosures about a reportable segment’s profit or loss and assets that are currently required annually.  The amended guidance does not change how a public entity identifies its operating segments, aggregates them or applies the quantitative thresholds to determine its reportable segments.  The guidance is applied retrospectively to all periods presented in financial statements, unless it is impracticable.  The guidance applies to all public entities and is effective for fiscal years beginning after December 15, 2023, and for interim periods beginning after December 15, 2024.  Early adoption is permitted.  The Company does not expect the adoption of this guidance to have a material impact on its consolidated financial statements.

Additional Income Tax Disclosures.  In December 2023, the FASB issued a final standard on improvements to income tax disclosures.  The standard requires public business entities to disclose in their rate reconciliation table additional categories of information about federal, state and foreign income taxes and to provide more details about the reconciling items in some categories if the items meet a quantitative threshold.  The guidance also requires all entities to disclose

annually income taxes paid (net of refunds received) disaggregated by federal (national), state and foreign taxes and to disaggregate the information by jurisdiction based on a quantitative threshold.  The standard applies to all entities subject to income taxes.  For public business entities, the new requirements will be effective for annual periods beginning after December 15, 2024.  The guidance will be applied on a prospective basis with the option to apply the standard retrospectively.  Early adoption is permitted.  The Company does not expect the adoption of this guidance to have a material impact on its consolidated financial statements.

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Revenue (Tables)

3 Months Ended

Mar. 31, 2024

Revenue [Abstract]

Total Reported Revenues by Service Line

	Three Months Ended March 31,
	2024		2023
Commercial	$	642,859	$	602,279
Residential		546,211		514,053
Industrial and construction roll off		325,990		318,315
Total collection		1,515,060		1,434,647
Landfill		353,478		343,433
Transfer		301,882		273,521
Recycling		49,025		31,301
E&P		97,408		51,759
Intermodal and other		49,541		38,212
Intercompany		(293,741)		(272,370)
Total	$	2,072,653	$	1,900,503

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Accounts Receivable (Tables)

3 Months Ended

Mar. 31, 2024

Accounts Receivable [Abstract]

Allowance for Credit Loss

	Three Months Ended March 31,
	2024		2023
Beginning balance	$	23,553	$	22,939
Current period provision for expected credit losses		3,730		2,247
Write-offs charged against the allowance		(5,728)		(5,017)
Recoveries collected		1,356		2,068
Impact of changes in foreign currency		(53)		2
Ending balance	$	22,858	$	22,239

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Landfill Accounting (Tables)

3 Months Ended

Mar. 31, 2024

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, 2023 to March 31, 2024:

Final capping, closure and post-closure liability at December 31, 2023	$	522,233
Liability adjustments		(8,726)
Accretion expense associated with landfill obligations		9,356
Closure payments		(28,950)
Assumption of closure liabilities from acquisitions		48,220
Foreign currency translation adjustment		(829)
Final capping, closure and post-closure liability at March 31, 2024	$	541,304

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Acquisitions (Tables)

3 Months Ended

Mar. 31, 2024

Acquisitions [Abstract]

Summary of Consideration Transferred to Acquire Businesses and Amounts of Identifiable Assets Acquired, Liabilities Assumed and Noncontrolling Interests

	2024		2023
	Acquisitions		Acquisitions
Fair value of consideration transferred:
Cash	$	1,156,422	$	144,611
Debt assumed		64,450		17,097
		1,220,872		161,708
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts receivable		51,852		3,882
Prepaid expenses and other current assets		9,951		2,290
Restricted investments		—		5,462
Operating lease right-of-use assets		2,317		587
Property and equipment		688,906		67,201
Long-term franchise agreements and contracts		77,384		58,630
Customer lists		102,418		1,527
Permits and other intangibles		136,868		2,403
Other assets		1,617		—
Accounts payable and accrued liabilities		(4,727)		(4,159)
Current portion of operating lease liabilities		(1,515)		(53)
Deferred revenue		(11,886)		(761)
Contingent consideration		(12,012)		(6,000)
Long-term portion of operating lease liabilities		(3,857)		(534)
Other long-term liabilities		(51,187)		(4,543)
Deferred income taxes		—		(1,077)
Total identifiable net assets		986,129		124,855
Goodwill	$	234,743	$	36,853

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Intangible Assets, Net (Tables)

3 Months Ended

Mar. 31, 2024

Intangible Assets, Net [Abstract]

Intangible Assets Exclusive of Goodwill

Intangible assets, exclusive of goodwill, consisted of the following at March 31, 2024:

	Gross				Accumulated		Net
	Carrying		Accumulated		Impairment		Carrying
	Amount		Amortization		Loss		Amount
Finite-lived intangible assets:
Long-term franchise agreements and contracts	$	1,035,243	$	(359,900)	$	—	$	675,343
Customer lists		905,627		(619,901)		—		285,726
Permits and other		919,818		(144,490)		(40,784)		734,544
		2,860,688		(1,124,291)		(40,784)		1,695,613
Indefinite-lived intangible assets:
Solid waste collection and transportation permits		181,613		—		—		181,613
Intangible assets, exclusive of goodwill	$	3,042,301	$	(1,124,291)	$	(40,784)	$	1,877,226

Intangible assets, exclusive of goodwill, consisted of the following at December 31, 2023:

	Gross				Accumulated		Net
	Carrying		Accumulated		Impairment		Carrying
	Amount		Amortization		Loss		Amount
Finite-lived intangible assets:
Long-term franchise agreements and contracts	$	960,033	$	(343,099)	$	—	$	616,934
Customer lists		806,257		(606,192)		—		200,065
Permits and other		784,905		(139,192)		(40,784)		604,929
		2,551,195		(1,088,483)		(40,784)		1,421,928
Indefinite-lived intangible assets:
Solid waste collection and transportation permits		181,613		—		—		181,613
Intangible assets, exclusive of goodwill	$	2,732,808	$	(1,088,483)	$	(40,784)	$	1,603,541

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 March 31, 2024 is as follows:

For the year ending December 31, 2024	$	172,784
For the year ending December 31, 2025	$	155,871
For the year ending December 31, 2026	$	136,081
For the year ending December 31, 2027	$	118,791
For the year ending December 31, 2028	$	105,796

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Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2024

Long-Term Debt [Abstract]

Long-Term Debt

The following table presents the Company’s long-term debt at March 31, 2024 and December 31, 2023:

	March 31,		December 31,
	2024		2023
Revolving Credit Agreement, bearing interest ranging from 6.30% to 6.43% (a)	$	2,237,794	$	—
Revolver under 2021 Revolving and Term Credit Agreement, bearing interest ranging from 6.40% to 8.50% (b)		—		453,245
Term loan under 2021 Revolving and Term Credit Agreement, bearing interest at 6.50% (b)		—		650,000
Term loan under 2022 Term Loan Agreement, bearing interest at 6.44% (b)		—		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
5.00% Senior Notes due 2034		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 2028 to 2036 (a)		37,124		48,774
Finance leases, bearing interest ranging from 1.89% to 5.07%, with lease expiration dates ranging from 2026 to 2029 (a)		9,292		10,034
		7,884,210		6,812,053
Less – current portion		(16,096)		(26,462)
Less – unamortized debt discount and issuance costs		(72,923)		(60,820)
Long-term portion of debt and notes payable	$	7,795,191	$	6,724,771

____________________

(a) Interest rates represent the interest rates at March 31, 2024.

(b) Interest rates represent the interest rates at December 31, 2023.

Details of the Company's Credit Agreement

Details of the Revolving Credit Agreement at March 31, 2024 and details of the 2021 Revolving and Term Credit Agreement at December 31, 2023 are as follows:

	March 31,			December 31,
	2024			2023
Revolver
Available	$	723,386		$	1,357,013
Letters of credit outstanding	$	38,820		$	39,742
Total amount drawn, as follows:	$	2,237,794		$	453,245
Amount drawn – U.S. Term SOFR rate loan	$	1,150,000		$	90,000
Interest rate applicable – U.S. Term SOFR rate loan		6.43	%		6.46	%
Amount drawn – U.S. Term SOFR rate loan	$	45,000		$	150,000
Interest rate applicable – U.S. Term SOFR rate loan		6.43	%		6.50	%
Amount drawn – U.S. base rate loan	$	—		$	28,000
Interest rate applicable – U.S. base rate loan		—	%		8.50	%
Amount drawn – Canadian Term CORRA loan	$	987,444		$	—
Interest rate applicable - Canadian term CORRA loan		6.30	%		—	%
Amount drawn – Canadian Term CORRA loan	$	55,350		$	—
Interest rate applicable - Canadian term CORRA loan		6.31	%		—	%
Amount drawn – Canadian prime rate loan	$	—		$	15,122
Interest rate applicable - Canadian prime rate loan		—	%		7.20	%
Amount drawn – Canadian bankers’ acceptance	$	—		$	153,111
Interest rate applicable – Canadian bankers’ acceptance		—	%		6.46	%
Amount drawn – Canadian bankers’ acceptance	$	—		$	17,012
Interest rate applicable – Canadian bankers’ acceptance		—	%		6.40	%
Commitment – rate applicable		0.09	%		0.09	%
Term loan
Amount drawn – U.S. Term SOFR rate loan	$	—		$	650,000
Interest rate applicable – U.S. Term SOFR rate loan		—	%		6.50	%

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Segment Reporting (Tables)

3 Months Ended

Mar. 31, 2024

Segment Reporting [Abstract]

Summary of Financial Information Concerning Company's Reportable Segments

Summarized financial information concerning the Company’s reportable segments for the three months ended March 31, 2024 and 2023, is shown in the following tables:

Three Months Ended			Intercompany		Reported		Segment
March 31, 2024	Revenue		Revenue(b)		Revenue		EBITDA(c)
Western	$	476,703	$	(54,454)	$	422,249	$	113,050
Southern		473,953		(55,007)		418,946		128,412
Central		403,086		(42,159)		360,927		125,922
Eastern		431,969		(71,906)		360,063		95,016
Canada		307,346		(26,984)		280,362		121,361
MidSouth		273,337		(43,231)		230,106		57,507
Corporate(a)		—		—		—		(11,133)
	$	2,366,394	$	(293,741)	$	2,072,653	$	630,135

Three Months Ended			Intercompany		Reported		Segment
March 31, 2023	Revenue		Revenue(b)		Revenue		EBITDA(c)
Western	$	444,796	$	(48,957)	$	395,839	$	110,689
Southern		451,000		(51,107)		399,893		121,914
Central		383,525		(43,540)		339,985		115,756
Eastern		388,797		(59,669)		329,128		73,275
Canada		253,670		(26,514)		227,156		82,984
MidSouth		251,085		(42,583)		208,502		57,731
Corporate(a)		—		—		—		(2,454)
	$	2,172,873	$	(272,370)	$	1,900,503	$	559,895

____________________

(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 generally 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 three months ended March 31, 2024 and 2023, by reportable segment:

	Western		Southern		Central		Eastern		Canada		MidSouth		Total
Balance as of December 31, 2023	$	779,455	$	1,559,703	$	1,008,500	$	1,587,491	$	1,723,068	$	746,183	$	7,404,400
Goodwill acquired		5,653		1,322		—		37,289		91,389		98,665		234,318
Goodwill acquisition adjustments		—		—		425		—		—		—		425
Impact of changes in foreign currency		—		—		—		—		(41,968)		—		(41,968)
Balance as of March 31, 2024	$	785,108	$	1,561,025	$	1,008,925	$	1,624,780	$	1,772,489	$	844,848	$	7,597,175

	Western		Southern		Central		Eastern		Canada		MidSouth		Total
Balance as of December 31, 2022	$	732,335	$	1,547,894	$	1,003,470	$	1,189,111	$	1,684,670	$	744,817	$	6,902,297
Goodwill acquired		30,703		—		397		3,440		—		3,249		37,789
Goodwill acquisition adjustments		—		(647)		—		—		(289)		—		(936)
Impact of changes in foreign currency		—		—		—		—		1,417		—		1,417
Balance as of March 31, 2023	$	763,038	$	1,547,247	$	1,003,867	$	1,192,551	$	1,685,798	$	748,066	$	6,940,567

Total Assets for Reportable Segments

Total assets for each of the Company’s reportable segments at March 31, 2024 and December 31, 2023, were as follows:

	March 31,		December 31,
	2024		2023
Western	$	3,434,367	$	3,432,529
Southern		3,500,113		3,501,953
Central		2,793,648		2,811,016
Eastern		3,281,517		3,228,244
Canada		3,625,769		2,794,795
MidSouth		1,991,424		1,705,180
Corporate		455,822		442,159
Total Assets	$	19,082,660	$	17,915,876

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
	March 31,
	2024		2023
Western segment EBITDA	$	113,050	$	110,689
Southern segment EBITDA		128,412		121,914
Central segment EBITDA		125,922		115,756
Eastern segment EBITDA		95,016		73,275
Canada segment EBITDA		121,361		82,984
MidSouth segment EBITDA		57,507		57,731
Subtotal reportable segments		641,268		562,349
Unallocated corporate overhead		(11,133)		(2,454)
Depreciation		(222,691)		(204,059)
Amortization of intangibles		(40,290)		(39,282)
Impairments and other operating items		(354)		(1,865)
Interest expense		(78,488)		(68,353)
Interest income		2,051		2,715
Other income (expense), net		(1,823)		3,174
Income before income tax provision	$	288,540	$	252,225

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Derivative Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2024

Fair Value of Derivative Instrument Designated as Cash Flow Hedges

The fair values of derivative instruments designated as cash flow hedges at March 31, 2024, 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)	$	18,500	Accrued liabilities	$	—
	Other assets, net		8,874
Total derivatives designated as cash flow hedges		$	27,374		$	—

____________________

(a)Represents the estimated amount of the existing unrealized gains on interest rate swaps at March 31, 2024 (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, 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	$	15,842	Accrued liabilities	$	—
	Other assets, net		6,945
Total derivatives designated as cash flow hedges		$	22,787		$	—

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 months ended March 31, 2024 and 2023:

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
	March 31,					March 31,
	2024		2023			2024		2023
Interest rate swaps	$	7,329	$	(2,425)	Interest expense	$	(3,958)	$	(2,999)

____________________

(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 March 31, 2024, 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.

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Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [Abstract]

Carrying Values and Fair Values of Debt Instruments

	Carrying Value at				Fair Value (a) at
	March 31,		December 31,		March 31,		December 31,
	2024		2023		2024		2023
4.25% Senior Notes due 2028	$	500,000	$	500,000	$	488,300	$	496,800
3.50% Senior Notes due 2029	$	500,000	$	500,000	$	470,750	$	478,350
2.60% Senior Notes due 2030	$	600,000	$	600,000	$	532,020	$	539,460
2.20% Senior Notes due 2032	$	650,000	$	650,000	$	533,325	$	543,725
3.20% Senior Notes due 2032	$	500,000	$	500,000	$	439,100	$	450,200
4.20% Senior Notes due 2033	$	750,000	$	750,000	$	706,275	$	729,600
5.00% Senior Notes due 2034	$	750,000	$	—	$	741,975	$	—
3.05% Senior Notes due 2050	$	500,000	$	500,000	$	341,350	$	362,600
2.95% Senior Notes due 2052	$	850,000	$	850,000	$	568,990	$	601,460

____________________

(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.

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Net Income Per Share Information (Tables)

3 Months Ended

Mar. 31, 2024

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 months ended March 31, 2024 and 2023:

	Three Months Ended
	March 31,
	2024		2023
Numerator:
Net income attributable to Waste Connections for basic and diluted earnings per share	$	230,054	$	197,813
Denominator:
Basic shares outstanding		257,801,116		257,372,942
Dilutive effect of equity-based awards		681,357		616,029
Diluted shares outstanding		258,482,473		257,988,971

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Fair Value of Measurements (Tables)

3 Months Ended

Mar. 31, 2024

Fair Value Disclosures [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 March 31, 2024 and December 31, 2023, were as follows:

	Fair Value Measurement at March 31, 2024 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	$	27,374	$	—	$	27,374	$	—
Restricted cash	$	103,773	$	103,773	$	—	$	—
Restricted investments	$	76,929	$	—	$	76,929	$	—
Contingent consideration	$	(117,733)	$	—	$	—	$	(117,733)

	Fair Value Measurement at December 31, 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	$	22,787	$	—	$	22,787	$	—
Restricted cash	$	105,639	$	105,639	$	—	$	—
Restricted investments	$	70,658	$	—	$	70,658	$	—
Contingent consideration	$	(115,030)	$	—	$	—	$	(115,030)

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 three months ended March 31, 2024 and 2023:

	Three Months Ended March 31,
	2024		2023
Beginning balance	$	115,030	$	81,415
Contingent consideration recorded at acquisition date		12,012		6,000
Payment of contingent consideration recorded at acquisition date		(11,295)		(1,319)
Adjustments to contingent consideration		—		(637)
Interest accretion expense		1,986		363
Ending balance	$	117,733	$	85,822

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Other Comprehensive Income (Loss) (Tables)

3 Months Ended

Mar. 31, 2024

Other Comprehensive Income (Loss) [Abstract]

Components of Other Comprehensive Income (Loss)

	Three Months Ended March 31, 2024
	Gross		Tax Effect		Net of Tax
Interest rate swap amounts reclassified into interest expense	$	(5,385)	$	1,427	$	(3,958)
Changes in fair value of interest rate swaps		9,972		(2,643)		7,329
Foreign currency translation adjustment		(56,381)		—		(56,381)
	$	(51,794)	$	(1,216)	$	(53,010)

	Three Months Ended March 31, 2023
	Gross		Tax Effect		Net of Tax
Interest rate swap amounts reclassified into interest expense	$	(4,080)	$	1,081	$	(2,999)
Changes in fair value of interest rate swaps		(3,299)		874		(2,425)
Foreign currency translation adjustment		1,682		—		1,682
	$	(5,697)	$	1,955	$	(3,742)

Amounts Included in Accumulated Other Comprehensive Income (Loss)

A rollforward of the amounts included in AOCIL, net of taxes, for the three months ended March 31, 2024 and 2023, is as follows:

			Foreign		Accumulated
			Currency		Other
	Interest		Translation		Comprehensive
	Rate Swaps		Adjustment		Income (Loss)
Balance at December 31, 2023	$	16,749	$	(26,575)	$	(9,826)
Amounts reclassified into earnings		(3,958)		—		(3,958)
Changes in fair value		7,329		—		7,329
Foreign currency translation adjustment		—		(56,381)		(56,381)
Balance at March 31, 2024	$	20,120	$	(82,956)	$	(62,836)

			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		(2,999)		—		(2,999)
Changes in fair value		(2,425)		—		(2,425)
Foreign currency translation adjustment		—		1,682		1,682
Balance at March 31, 2023	$	17,954	$	(78,526)	$	(60,572)

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Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2024

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 three-month period ended March 31, 2024, is presented below:

	Unvested Shares
Outstanding at December 31, 2023	936,267
Granted	361,108
Forfeited	(16,114)
Vested and issued	(329,996)
Outstanding at March 31, 2024	951,265

Summary of Activity Related to Restricted Share Units

A summary of activity related to restricted share units (“RSUs”) during the three-month period ended March 31, 2024, is presented below:

	Unvested Shares
Outstanding at December 31, 2023	936,267
Granted	361,108
Forfeited	(16,114)
Vested and issued	(329,996)
Outstanding at March 31, 2024	951,265

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 three-month period ended March 31, 2024, is presented below:

	Unvested Shares
Outstanding at December 31, 2023	259,532
Granted	113,166
Vested and issued	(153,555)
Outstanding at March 31, 2024	219,143

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 three-month period ended March 31, 2024, is presented below:

	Unvested Shares
Outstanding at December 31, 2023	259,532
Granted	113,166
Vested and issued	(153,555)
Outstanding at March 31, 2024	219,143

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 three-month period ended March 31, 2024, is presented below:

	Vested Shares
Outstanding at December 31, 2023	30,481
Granted	3,363
Outstanding at March 31, 2024	33,844

Summary of Activity Related to Restricted Share Units

A summary of activity related to deferred share units (“DSUs”) during the three-month period ended March 31, 2024, is presented below:

	Vested Shares
Outstanding at December 31, 2023	30,481
Granted	3,363
Outstanding at March 31, 2024	33,844

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, 2023	51,812
Cash settled	(1,750)
Outstanding at March 31, 2024	50,062

Summary of Activity Related to Restricted Share Units

Outstanding at December 31, 2023	51,812
Cash settled	(1,750)
Outstanding at March 31, 2024	50,062

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Revenue - Revenues by Service Line (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue from External Customer [Line Items]
Revenues	$ 2,072,653	$ 1,900,503
Reportable Segments | Commercial | Collection
Revenue from External Customer [Line Items]
Revenues	642,859	602,279
Reportable Segments | Residential | Collection
Revenue from External Customer [Line Items]
Revenues	546,211	514,053
Reportable Segments | Industrial and construction roll off | Collection
Revenue from External Customer [Line Items]
Revenues	325,990	318,315
Reportable Segments | Collection
Revenue from External Customer [Line Items]
Revenues	1,515,060	1,434,647
Reportable Segments | Landfill
Revenue from External Customer [Line Items]
Revenues	353,478	343,433
Reportable Segments | Transfer
Revenue from External Customer [Line Items]
Revenues	301,882	273,521
Reportable Segments | Recycling
Revenue from External Customer [Line Items]
Revenues	49,025	31,301
Reportable Segments | Exploration and Production Waste Treatment Recovery and Disposal
Revenue from External Customer [Line Items]
Revenues	97,408	51,759
Reportable Segments | Intermodal and other
Revenue from External Customer [Line Items]
Revenues	49,541	38,212
Intercompany Revenue
Revenue from External Customer [Line Items]
Revenues	$ (293,741)	$ (272,370)

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Revenue - Contract Acquisition Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Capitalized contract costs	$ 26,102	$ 25,977
Minimum
Estimated life of relevant customer relationship	1 year
Maximum
Estimated life of relevant customer relationship	5 years

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Accounts Receivable - Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accounts Receivable [Abstract]
Allowance for Credit Losses, Beginning Balance	$ 23,553	$ 22,939
Current period provision for expected credit losses	3,730	2,247
Write-offs charged against the allowance	(5,728)	(5,017)
Recoveries collected	1,356	2,068
Impact of changes in foreign currency	(53)	2
Allowance for Credit Losses, Ending Balance	$ 22,858	$ 22,239

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Landfill Accounting - Landfills Owned and Operated (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) site	Dec. 31, 2023 USD ($)
Landfill Accounting [Line Items]
Number of landfills owned and operated by company	100
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 | $	$ 7,827,304	$ 7,228,331
Average remaining landfill life based on permitted capacity and projected annual disposal volumes	32 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	35 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	382 years
Percentage of projected annual disposal volume from landfills with remaining lives within threshold period	90.00%
Threshold period used for measurement of projected annual disposal volume from landfills	70 years
Landfill
Landfill Accounting [Line Items]
Property and equipment, net | $	$ 3,297,752

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Landfill Accounting - Landfill Depletion (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($) $ / T	Mar. 31, 2023 USD ($) $ / T
Landfill Accounting [Abstract]
Landfill depletion expense | $	$ 62,525	$ 59,055
Average rate per ton consumed related to landfill depletion at owned landfills and landfills operated under life-of-site agreements | $ / T	5.29	5.06

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Landfill Accounting - Reserve Assumptions and Accretion Expense (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) $ / T	Mar. 31, 2023 USD ($) $ / T	Dec. 31, 2023
Landfill Accounting [Line Items]
Accretion expense associated with landfill obligations | $	$ 9,356	$ 4,474
Average rate per ton consumed related to final capping, closure and post-closure landfill accretion expense | $ / T	0.78	0.38
Landfill
Landfill Accounting [Line Items]
Inflation rate for purposes of computing layers for final capping, closure and post-closure obligations	2.75%		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%		5.50%

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Landfill Accounting - Final Capping, Closure and Post-Closure Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Landfill Accounting [Abstract]
Final capping, closure and post-closure liability at the beginning of the period	$ 522,233
Liability adjustments	(8,726)
Accretion expense associated with landfill obligations	9,356	$ 4,474
Closure payments	(28,950)
Assumption of closure liabilities from acquisitions	48,220
Foreign currency translation adjustment	(829)
Final capping, closure and post-closure liability at the end of the period	$ 541,304

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Landfill Accounting - Liability Adjustments and Restricted Cash and Investments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Landfill Accounting [Line Items]
Liability adjustments	$ 8,726
Restricted cash	105,683	$ 105,639
Restricted investments	74,655	70,350
Landfill
Landfill Accounting [Line Items]
Restricted cash	7,655	12,381
Restricted investments	$ 63,697	$ 59,551

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Acquisitions - Narrative (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($) entity	Mar. 31, 2023 USD ($) entity	Mar. 31, 2024 USD ($) entity
Business Acquisition [Line Items]
Acquisition-related costs	$ 9,847	$ 2,081
Goodwill expected to be deductible for tax purposes	234,743	36,853	$ 234,743
Trade receivables acquired in business combination gross contractual amount	52,335	4,164	52,335
Trade receivables acquired in business combination expected to be uncollectible amount	483	282	$ 483
Number of individually immaterial acquisitions | entity			9
Payment of contingent consideration recorded at acquisition date	$ 11,295	$ 1,319
Solid Waste
Business Acquisition [Line Items]
Number of immaterial businesses acquired in period | entity	9	4
Exploration and Production Waste Treatment Recovery and Disposal
Business Acquisition [Line Items]
Number of immaterial businesses acquired in period | entity	1

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Acquisitions - Consideration Transferred to Acquire Businesses and Assets Acquired, Liabilities Assumed Schedule (Detail) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2024 USD ($) entity
Fair value of consideration transferred:
Cash	$ 1,156,422	$ 144,611
Consideration transferred	1,220,872	161,708
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts receivable	51,852	3,882	$ 51,852
Prepaid expenses and other current assets	9,951	2,290	9,951
Restricted investments	0	5,462	0
Operating lease right-of-use assets	2,317	587	2,317
Property and equipment	688,906	67,201	688,906
Other assets	1,617	0	1,617
Current portion of operating lease liabilities	(1,515)	(53)	(1,515)
Deferred revenue	(11,886)	(761)	(11,886)
Long-term portion of operating lease liabilities	(3,857)	(534)	(3,857)
Other long-term liabilities	(51,187)	(4,543)	(51,187)
Deferred income taxes	0	(1,077)	0
Total identifiable net assets	986,129	124,855	986,129
Goodwill	234,743	36,853
Goodwill expected to be deductible for tax purposes	234,743	36,853	$ 234,743
Number of individually immaterial acquisitions | entity			9
Trade receivables acquired in business combination gross contractual amount	52,335	4,164	$ 52,335
Trade receivables acquired in business combination expected to be uncollectible amount	483	282	483
Accounts Payable and Accrued Liabilities
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Accounts payable and accrued liabilities	(4,727)	(4,159)	(4,727)
Debt
Fair value of consideration transferred:
Debt assumed	64,450	17,097
Contingent Consideration
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Contingent consideration	(12,012)	(6,000)	(12,012)
Long Term Franchise Agreements And Contracts
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles	77,384	58,630	77,384
Customer Lists
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles	102,418	1,527	102,418
Permits and Other
Recognized amounts of identifiable assets acquired and liabilities assumed associated with businesses acquired:
Intangibles	$ 136,868	$ 2,403	$ 136,868

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Intangible Assets, Net - Narrative (Details)	3 Months Ended
	Mar. 31, 2024
Long-term Franchise Agreements and Contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period of acquired intangible assets	12 years 1 month 6 days
Customer Lists
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period of acquired intangible assets	10 years 1 month 6 days
Permits and Other
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted average amortization period of acquired intangible assets	40 years

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Intangible Assets, Net - Intangible Assets Exclusive of Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	$ 2,860,688	$ 2,551,195
Gross Carrying Amount, Intangible Assets, Exclusive of Goodwill	3,042,301	2,732,808
Accumulated Amortization, Finite-Lived Intangible Assets	(1,124,291)	(1,088,483)
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	1,695,613	1,421,928
Net Carrying Amount, Intangible Assets	1,877,226	1,603,541
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	1,035,243	960,033
Accumulated Amortization, Finite-Lived Intangible Assets	(359,900)	(343,099)
Net Carrying Amount, Finite-Lived Intangible Assets	675,343	616,934
Customer Lists
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	905,627	806,257
Accumulated Amortization, Finite-Lived Intangible Assets	(619,901)	(606,192)
Net Carrying Amount, Finite-Lived Intangible Assets	285,726	200,065
Permits and Other
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items]
Gross Carrying Amount, Finite-Lived Intangible Assets	919,818	784,905
Accumulated Amortization, Finite-Lived Intangible Assets	(144,490)	(139,192)
Accumulated Impairment Loss, Finite-Lived Intangible Assets	(40,784)	(40,784)
Net Carrying Amount, Finite-Lived Intangible Assets	$ 734,544	$ 604,929

XML

Intangible Assets, Net - Estimated Future Amortization Expense, Intangible Assets (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Intangible Assets, Net [Abstract]
For the year ending December 31, 2024	$ 172,784
For the year ending December 31, 2025	155,871
For the year ending December 31, 2026	136,081
For the year ending December 31, 2027	118,791
For the year ending December 31, 2028	$ 105,796

XML

Long-Term Debt - Schedule of LTD and Lease Obligations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Finance leases	$ 9,292	$ 10,034
Total debt and lease obligations	7,884,210	6,812,053
Less - current portion	(16,096)	(26,462)
Less - unamortized debt discount and issuance costs	(72,923)	(60,820)
Long-term Debt and Lease Obligation	$ 7,795,191	6,724,771
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%
Revolving Credit Agreement | SOFR
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Margin rate for loans	0.10%
Revolving Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Long Term Debt	$ 2,237,794	0
Revolving Credit Agreement | Revolving Credit Facility | Minimum
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Line of credit, interest rate	6.30%
Revolving Credit Agreement | Revolving Credit Facility | Maximum
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Line of credit, interest rate	6.43%
Revolving Credit Agreement | Revolving Credit Facility | Base Rate
Debt Instrument [Line Items]
Long Term Debt	$ 0
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Line of credit, interest rate	0.00%
Revolving Credit Agreement | Revolving Credit Facility | Canadian Prime Rate
Debt Instrument [Line Items]
Long Term Debt	$ 0
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Line of credit, interest rate	0.00%
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility
Debt Instrument [Line Items]
Long Term Debt	$ 0	$ 453,245
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | Minimum
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Line of credit, interest rate		6.40%
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | Maximum
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Line of credit, interest rate		8.50%
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | Base Rate
Debt Instrument [Line Items]
Long Term Debt		$ 28,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Line of credit, interest rate		8.50%
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | Canadian Prime Rate
Debt Instrument [Line Items]
Long Term Debt		$ 15,122
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Line of credit, interest rate		7.20%
Notes Payable to Sellers and Other Third Parties
Debt Instrument [Line Items]
Long Term Debt	$ 37,124	$ 48,774
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%
Term Loan Facility | Revolving And Term Credit Agreement 2021
Debt Instrument [Line Items]
Long Term Debt	$ 0	$ 650,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Line of credit, interest rate		6.50%
Term Loan Facility | Term Loan Agreement 2022
Debt Instrument [Line Items]
Long Term Debt	0	$ 800,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Line of credit, interest rate		6.44%
Senior Notes | Senior Notes due 2028
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 | Senior Notes due 2029
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 | Senior Notes due 2030
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 | Senior Notes due 2032
Debt Instrument [Line Items]
Long Term Debt	$ 650,000	$ 650,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Interest rate	2.20%	2.20%
Senior Notes | New Senior Notes due 2032
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 | Senior Notes due 2033
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 | Senior Notes due 2034
Debt Instrument [Line Items]
Long Term Debt	$ 750,000	$ 0
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Interest rate	5.00%
Senior Notes | Senior Notes due 2050
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 | Senior Notes due 2052
Debt Instrument [Line Items]
Long Term Debt	$ 850,000	$ 850,000
Debt Instrument, Interest Rate, Stated Percentage [Abstract]
Interest rate	2.95%	2.95%

XML

Long-Term Debt - Revolving Credit Agreement Schedule (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Revolving Credit Agreement | SOFR
Debt Instrument [Line Items]
Margin rate for loans	0.10%
Revolving Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Available	$ 723,386
Amount drawn	$ 2,237,794	$ 0
Commitment - rate applicable	0.09%
Long Term Debt	$ 2,237,794	0
Revolving Credit Agreement | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Interest rate applicable	6.30%
Revolving Credit Agreement | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Interest rate applicable	6.43%
Revolving Credit Agreement | Revolving Credit Facility | CORRA | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Amount drawn	$ 987,444
Interest rate applicable	6.30%
Long Term Debt	$ 987,444
Revolving Credit Agreement | Revolving Credit Facility | CORRA | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Amount drawn	$ 55,350
Interest rate applicable	6.31%
Long Term Debt	$ 55,350
Revolving Credit Agreement | Revolving Credit Facility | SOFR | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Amount drawn	$ 1,150,000
Interest rate applicable	6.43%
Long Term Debt	$ 1,150,000
Revolving Credit Agreement | Revolving Credit Facility | SOFR | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Amount drawn	$ 45,000
Interest rate applicable	6.43%
Long Term Debt	$ 45,000
Revolving Credit Agreement | Revolving Credit Facility | Base Rate
Debt Instrument [Line Items]
Amount drawn	$ 0
Interest rate applicable	0.00%
Long Term Debt	$ 0
Revolving Credit Agreement | Revolving Credit Facility | Canadian Bankers Acceptance Loan | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Amount drawn	$ 0
Interest rate applicable	0.00%
Long Term Debt	$ 0
Revolving Credit Agreement | Revolving Credit Facility | Canadian Bankers Acceptance Loan | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Amount drawn	$ 0
Interest rate applicable	0.00%
Long Term Debt	$ 0
Revolving Credit Agreement | Revolving Credit Facility | Canadian Prime Rate
Debt Instrument [Line Items]
Amount drawn	$ 0
Interest rate applicable	0.00%
Long Term Debt	$ 0
Revolving Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Letter of credit	38,820
Revolving Credit Agreement | Term Loan Facility | SOFR
Debt Instrument [Line Items]
Amount drawn	$ 0
Interest rate applicable	0.00%
Long Term Debt	$ 0
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility
Debt Instrument [Line Items]
Available		1,357,013
Amount drawn	0	$ 453,245
Commitment - rate applicable		0.09%
Long Term Debt	$ 0	$ 453,245
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Interest rate applicable		6.40%
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Interest rate applicable		8.50%
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | CORRA | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Amount drawn		$ 0
Interest rate applicable		0.00%
Long Term Debt		$ 0
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | CORRA | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Amount drawn		$ 0
Interest rate applicable		0.00%
Long Term Debt		$ 0
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | SOFR | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Amount drawn		$ 90,000
Interest rate applicable		6.46%
Long Term Debt		$ 90,000
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | SOFR | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Amount drawn		$ 150,000
Interest rate applicable		6.50%
Long Term Debt		$ 150,000
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | Base Rate
Debt Instrument [Line Items]
Amount drawn		$ 28,000
Interest rate applicable		8.50%
Long Term Debt		$ 28,000
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | Canadian Bankers Acceptance Loan | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Amount drawn		$ 153,111
Interest rate applicable		6.46%
Long Term Debt		$ 153,111
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | Canadian Bankers Acceptance Loan | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Amount drawn		$ 17,012
Interest rate applicable		6.40%
Long Term Debt		$ 17,012
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | Canadian Prime Rate
Debt Instrument [Line Items]
Amount drawn		$ 15,122
Interest rate applicable		7.20%
Long Term Debt		$ 15,122
Revolving And Term Credit Agreement 2021 | Letter of Credit
Debt Instrument [Line Items]
Letter of credit		39,742
Revolving And Term Credit Agreement 2021 | Term Loan Facility | SOFR
Debt Instrument [Line Items]
Amount drawn		$ 650,000
Interest rate applicable		6.50%
Long Term Debt		$ 650,000

XML

Long-Term Debt - Revolving Credit Agreement Narrative (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
SOFR Loans, CORRA Loans, and Letters of Credit | Minimum
Debt Instrument [Line Items]
Margin rate for loans	0.75%
SOFR Loans, CORRA Loans, and Letters of Credit | Maximum
Debt Instrument [Line Items]
Margin rate for loans	1.25%
Revolving Credit Agreement
Debt Instrument [Line Items]
Covenant description	as of the last day of each fiscal quarter, the ratio of (a) Consolidated Total Funded Debt (as defined in the Revolving Credit Agreement) as of such date to (b) Consolidated EBITDA (as defined in the Revolving Credit Agreement), measured for the preceding 12 months, to not more than 3.75 to 1.00 (or 4.25 to 1.00 during material acquisition periods, subject to certain limitations)
Debt Instrument, Covenant Compliance	As of March 31, 2024, the Company was in compliance with all applicable covenants in the Revolving Credit Agreement
Revolving Credit Agreement | Maximum
Debt Instrument [Line Items]
Required Leverage Ratio	3.75
Required leverage ratio during material acquisition period	4.25
Revolving Credit Agreement | CORRA | One Month
Debt Instrument [Line Items]
Margin rate for loans	0.29547%
Revolving Credit Agreement | CORRA | Three Months
Debt Instrument [Line Items]
Margin rate for loans	0.32138%
Revolving Credit Agreement | SOFR
Debt Instrument [Line Items]
Margin rate for loans	0.10%
Revolving Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Letter of credit	$ 38,820
Revolving Credit Agreement | Letter of Credit | Maximum
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	320,000
Revolving Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	3,000,000
Upsize available to credit facility maximum borrowing capacity	$ 1,000,000
Revolving Credit Agreement | Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Commitment Fee, Percentage	0.065%
Revolving Credit Agreement | Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity	$ 4,000,000
Commitment Fee, Percentage	0.15%
Revolving Credit Agreement | Swing Line Loans | Maximum
Debt Instrument [Line Items]
Swing line loans	$ 100,000
Revolving And Term Credit Agreement 2021 | Letter of Credit
Debt Instrument [Line Items]
Letter of credit		$ 39,742
Facilities Other Than Revolving Credit Agreement | Letter of Credit
Debt Instrument [Line Items]
Letter of credit	$ 102,960
Canadian Prime Rate Loans and Swing Line Loans | Base Rate | Minimum
Debt Instrument [Line Items]
Margin rate for loans	0.00%
Canadian Prime Rate Loans and Swing Line Loans | Base Rate | Maximum
Debt Instrument [Line Items]
Margin rate for loans	0.25%
Senior Notes | Senior Notes due 2034
Debt Instrument [Line Items]
Maturity date	Mar. 01, 2034

XML

Long-Term Debt - Private Placement Notes Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Revolving Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Long Term Debt	$ 2,237,794	$ 0
Revolving Credit Agreement | Revolving Credit Facility | CORRA | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Long Term Debt	987,444
Revolving Credit Agreement | Revolving Credit Facility | CORRA | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Long Term Debt	55,350
Revolving Credit Agreement | Revolving Credit Facility | SOFR | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Long Term Debt	1,150,000
Revolving Credit Agreement | Revolving Credit Facility | SOFR | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Long Term Debt	45,000
Revolving Credit Agreement | Revolving Credit Facility | Base Rate
Debt Instrument [Line Items]
Long Term Debt	0
Revolving Credit Agreement | Revolving Credit Facility | Canadian Bankers Acceptance Loan | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Long Term Debt	0
Revolving Credit Agreement | Revolving Credit Facility | Canadian Bankers Acceptance Loan | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Long Term Debt	0
Revolving Credit Agreement | Revolving Credit Facility | Canadian Prime Rate
Debt Instrument [Line Items]
Long Term Debt	0
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility
Debt Instrument [Line Items]
Long Term Debt	0	453,245
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | CORRA | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Long Term Debt		0
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | CORRA | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Long Term Debt		0
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | SOFR | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Long Term Debt		90,000
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | SOFR | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Long Term Debt		150,000
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | Base Rate
Debt Instrument [Line Items]
Long Term Debt		28,000
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | Canadian Bankers Acceptance Loan | Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Long Term Debt		153,111
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | Canadian Bankers Acceptance Loan | Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Long Term Debt		17,012
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility | Canadian Prime Rate
Debt Instrument [Line Items]
Long Term Debt		15,122
Notes Payable to Sellers and Other Third Parties
Debt Instrument [Line Items]
Long Term Debt	37,124	48,774
Term Loan Facility | Revolving And Term Credit Agreement 2021
Debt Instrument [Line Items]
Long Term Debt	0	650,000
Senior Notes | Senior Notes due 2028
Debt Instrument [Line Items]
Long Term Debt	500,000	500,000
Senior Notes | Senior Notes due 2029
Debt Instrument [Line Items]
Long Term Debt	500,000	500,000
Senior Notes | Senior Notes due 2030
Debt Instrument [Line Items]
Long Term Debt	600,000	600,000
Senior Notes | Senior Notes due 2032
Debt Instrument [Line Items]
Long Term Debt	650,000	650,000
Senior Notes | New Senior Notes due 2032
Debt Instrument [Line Items]
Long Term Debt	500,000	500,000
Senior Notes | Senior Notes due 2033
Debt Instrument [Line Items]
Long Term Debt	750,000	750,000
Senior Notes | Senior Notes due 2034
Debt Instrument [Line Items]
Long Term Debt	$ 750,000	0
Maturity date	Mar. 01, 2034
Senior Notes | Senior Notes due 2050
Debt Instrument [Line Items]
Long Term Debt	$ 500,000	500,000
Senior Notes | Senior Notes due 2052
Debt Instrument [Line Items]
Long Term Debt	$ 850,000	$ 850,000

XML

Long-Term Debt - Senior Notes Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Feb. 21, 2024
Revolving Credit Agreement
Debt Instrument [Line Items]
Debt Instrument, Covenant Compliance	As of March 31, 2024, the Company was in compliance with all applicable covenants in the Revolving Credit Agreement
Revolving Credit Agreement | SOFR
Debt Instrument [Line Items]
Margin rate for loans	0.10%
Revolving Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Commitment - rate applicable	0.09%
Revolving And Term Credit Agreement 2021 | Revolving Credit Facility
Debt Instrument [Line Items]
Commitment - rate applicable		0.09%
Notes Payable to Sellers and Other Third Parties | Minimum
Debt Instrument [Line Items]
Interest rate	2.42%
Notes Payable to Sellers and Other Third Parties | Maximum
Debt Instrument [Line Items]
Interest rate	10.35%
Senior Notes | Senior Notes due 2028
Debt Instrument [Line Items]
Interest rate	4.25%	4.25%
Senior Notes | Senior Notes due 2029
Debt Instrument [Line Items]
Interest rate	3.50%	3.50%
Senior Notes | Senior Notes due 2030
Debt Instrument [Line Items]
Interest rate	2.60%	2.60%
Senior Notes | Senior Notes due 2032
Debt Instrument [Line Items]
Interest rate	2.20%	2.20%
Senior Notes | New Senior Notes due 2032
Debt Instrument [Line Items]
Interest rate	3.20%	3.20%
Senior Notes | Senior Notes due 2033
Debt Instrument [Line Items]
Interest rate	4.20%	4.20%
Senior Notes | Senior Notes due 2034
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	100.00%
Aggregate principal amount			$ 750,000
Interest rate	5.00%
Debt instrument, redemption period	Dec. 01, 2033
Senior Notes | Senior Notes due 2034 | Minimum
Debt Instrument [Line Items]
Percentage of principal amount redeemed	25.00%
Senior Notes | Senior Notes due 2034 | Maximum
Debt Instrument [Line Items]
Debt instrument, redemption price, percentage	101.00%
Senior Notes | Senior Notes due 2050
Debt Instrument [Line Items]
Interest rate	3.05%	3.05%
Senior Notes | Senior Notes due 2052
Debt Instrument [Line Items]
Interest rate	2.95%	2.95%

XML

Long-Term Debt - Future Principal Payments Schedule (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Long-Term Debt [Abstract]
Total debt and lease obligations	$ 7,884,210	$ 6,812,053

XML

Segment Reporting - Narrative (Details)	3 Months Ended
	Mar. 31, 2024 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

XML

Segment Reporting - Summary of Financial Information of Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Segment Reporting Information [Line Items]
Revenue		$ 2,072,653	$ 1,900,503
Segment EBITDA	[1]	630,135	559,895
Total assets		19,082,660		$ 17,915,876
Intercompany Revenue
Segment Reporting Information [Line Items]
Revenue	[2]	(293,741)	(272,370)
Reportable Segments
Segment Reporting Information [Line Items]
Revenue		2,366,394	2,172,873
Segment EBITDA		641,268	562,349
Corporate
Segment Reporting Information [Line Items]
Revenue	[2]	0	0
Segment EBITDA	[1]	(11,133)	(2,454)
Total assets		455,822		442,159
Southern
Segment Reporting Information [Line Items]
Revenue		418,946	399,893
Southern | Intercompany Revenue
Segment Reporting Information [Line Items]
Revenue	[2]	(55,007)	(51,107)
Southern | Reportable Segments
Segment Reporting Information [Line Items]
Revenue		473,953	451,000
Segment EBITDA	[1]	128,412	121,914
Total assets		3,500,113		3,501,953
Western
Segment Reporting Information [Line Items]
Revenue		422,249	395,839
Western | Intercompany Revenue
Segment Reporting Information [Line Items]
Revenue	[2]	(54,454)	(48,957)
Western | Reportable Segments
Segment Reporting Information [Line Items]
Revenue		476,703	444,796
Segment EBITDA	[1]	113,050	110,689
Total assets		3,434,367		3,432,529
Central
Segment Reporting Information [Line Items]
Revenue		360,927	339,985
Central | Intercompany Revenue
Segment Reporting Information [Line Items]
Revenue	[2]	(42,159)	(43,540)
Central | Reportable Segments
Segment Reporting Information [Line Items]
Revenue		403,086	383,525
Segment EBITDA	[1]	125,922	115,756
Total assets		2,793,648		2,811,016
Eastern
Segment Reporting Information [Line Items]
Revenue		360,063	329,128
Eastern | Intercompany Revenue
Segment Reporting Information [Line Items]
Revenue	[2]	(71,906)	(59,669)
Eastern | Reportable Segments
Segment Reporting Information [Line Items]
Revenue		431,969	388,797
Segment EBITDA	[1]	95,016	73,275
Total assets		3,281,517		3,228,244
Canada
Segment Reporting Information [Line Items]
Revenue		280,362	227,156
Canada | Intercompany Revenue
Segment Reporting Information [Line Items]
Revenue	[2]	(26,984)	(26,514)
Canada | Reportable Segments
Segment Reporting Information [Line Items]
Revenue		307,346	253,670
Segment EBITDA	[1]	121,361	82,984
Total assets		3,625,769		2,794,795
MidSouth
Segment Reporting Information [Line Items]
Revenue		230,106	208,502
MidSouth | Intercompany Revenue
Segment Reporting Information [Line Items]
Revenue	[2]	(43,231)	(42,583)
MidSouth | Reportable Segments
Segment Reporting Information [Line Items]
Revenue		273,337	251,085
Segment EBITDA	[1]	57,507	$ 57,731
Total assets		$ 1,991,424		$ 1,705,180

[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.

[2] Intercompany revenues reflect each segment’s total intercompany sales, including intercompany sales within a segment and between segments. Transactions within and between segments are generally made on a basis intended to reflect the market value of the service.

XML

Segment Reporting - Changes in Goodwill by Reportable Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 7,404,400	$ 6,902,297
Goodwill acquired	234,318	37,789
Goodwill acquisition adjustments	425	(936)
Impact of changes in foreign currency	(41,968)	1,417
Goodwill, Ending Balance	7,597,175	6,940,567
Southern | Reportable Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	1,559,703	1,547,894
Goodwill acquired	1,322	0
Goodwill acquisition adjustments	0	(647)
Impact of changes in foreign currency	0	0
Goodwill, Ending Balance	1,561,025	1,547,247
Western | Reportable Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	779,455	732,335
Goodwill acquired	5,653	30,703
Goodwill acquisition adjustments	0	0
Impact of changes in foreign currency	0	0
Goodwill, Ending Balance	785,108	763,038
Central | Reportable Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	1,008,500	1,003,470
Goodwill acquired	0	397
Goodwill acquisition adjustments	425	0
Impact of changes in foreign currency	0	0
Goodwill, Ending Balance	1,008,925	1,003,867
Eastern | Reportable Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	1,587,491	1,189,111
Goodwill acquired	37,289	3,440
Goodwill acquisition adjustments	0	0
Impact of changes in foreign currency	0	0
Goodwill, Ending Balance	1,624,780	1,192,551
Canada | Reportable Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	1,723,068	1,684,670
Goodwill acquired	91,389	0
Goodwill acquisition adjustments	0	(289)
Impact of changes in foreign currency	(41,968)	1,417
Goodwill, Ending Balance	1,772,489	1,685,798
MidSouth | Reportable Segments
Goodwill [Line Items]
Goodwill, Beginning Balance	746,183	744,817
Goodwill acquired	98,665	3,249
Goodwill acquisition adjustments	0	0
Impact of changes in foreign currency	0	0
Goodwill, Ending Balance	$ 844,848	$ 748,066

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Segment Reporting - Assets by Reportable Segments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Total assets	$ 19,082,660	$ 17,915,876
Corporate
Segment Reporting Information [Line Items]
Total assets	455,822	442,159
Southern | Reportable Segments
Segment Reporting Information [Line Items]
Total assets	3,500,113	3,501,953
Western | Reportable Segments
Segment Reporting Information [Line Items]
Total assets	3,434,367	3,432,529
Central | Reportable Segments
Segment Reporting Information [Line Items]
Total assets	2,793,648	2,811,016
Eastern | Reportable Segments
Segment Reporting Information [Line Items]
Total assets	3,281,517	3,228,244
Canada | Reportable Segments
Segment Reporting Information [Line Items]
Total assets	3,625,769	2,794,795
MidSouth | Reportable Segments
Segment Reporting Information [Line Items]
Total assets	$ 1,991,424	$ 1,705,180

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Segment Reporting - Reconciliation of Segment EBITDA to Income Before Income Tax Provision (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Segment EBITDA	[1]	$ 630,135	$ 559,895
Depreciation		(222,691)	(204,059)
Amortization of intangibles		(40,290)	(39,282)
Impairments and other operating items		(354)	(1,865)
Interest expense		(78,488)	(68,353)
Interest income		2,051	2,715
Other income, net		(1,823)	3,174
Income before income tax provision		288,540	252,225
Reportable Segments
Segment Reporting Information [Line Items]
Segment EBITDA		641,268	562,349
Corporate
Segment Reporting Information [Line Items]
Segment EBITDA	[1]	(11,133)	(2,454)
Eastern | Reportable Segments
Segment Reporting Information [Line Items]
Segment EBITDA	[1]	95,016	73,275
Southern | Reportable Segments
Segment Reporting Information [Line Items]
Segment EBITDA	[1]	128,412	121,914
Western | Reportable Segments
Segment Reporting Information [Line Items]
Segment EBITDA	[1]	113,050	110,689
Central | Reportable Segments
Segment Reporting Information [Line Items]
Segment EBITDA	[1]	125,922	115,756
Canada | Reportable Segments
Segment Reporting Information [Line Items]
Segment EBITDA	[1]	121,361	82,984
MidSouth | Reportable Segments
Segment Reporting Information [Line Items]
Segment EBITDA	[1]	$ 57,507	$ 57,731

[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.

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Derivative Financial Instruments - Narrative (Details) $ in Thousands	Mar. 31, 2024 USD ($) agreement
Derivative [Line Items]
Number of interest rate swap agreements | agreement	4
Interest Rate Swap One
Derivative [Line Items]
Notional amount	$ 200,000
Interest Rate Swap Two
Derivative [Line Items]
Notional amount	200,000
Interest Rate Swap Three
Derivative [Line Items]
Notional amount	200,000
Interest Rate Swap Four
Derivative [Line Items]
Notional amount	$ 200,000

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Derivative Financial Instruments - Cash Flow Hedges Impact on Financial Results (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax		$ (7,329)	$ 2,425
Amounts reclassified into earnings, net of taxes		(3,958)	(2,999)
Interest Rate Swap
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax		(7,329)	2,425
Amounts reclassified into earnings, net of taxes		(3,958)	(2,999)
Cash Flow Hedging | Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Amounts reclassified into earnings, net of taxes	[1]	(3,958)	(2,999)
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	[2]	$ (7,329)	$ (2,425)

[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.

[2] 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.

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Fair Value of Financial Instruments - Carrying Values and Fair Values of Debt Instruments (Details) - Senior Notes - USD ($) $ in Thousands		Mar. 31, 2024	Dec. 31, 2023
Senior Notes due 2028
Debt Instrument [Line Items]
Carrying value of senior notes		$ 500,000	$ 500,000
Fair value of senior notes	[1]	$ 488,300	$ 496,800
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]	$ 470,750	$ 478,350
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]	$ 532,020	$ 539,460
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]	$ 533,325	$ 543,725
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]	$ 439,100	$ 450,200
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]	$ 706,275	$ 729,600
Interest rate		4.20%	4.20%
Senior Notes due 2034
Debt Instrument [Line Items]
Carrying value of senior notes		$ 750,000	$ 0
Fair value of senior notes	[1]	$ 741,975	0
Interest rate		5.00%
Senior Notes due 2050
Debt Instrument [Line Items]
Carrying value of senior notes		$ 500,000	500,000
Fair value of senior notes	[1]	$ 341,350	$ 362,600
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]	$ 568,990	$ 601,460
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.

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Fair Value of Financial Instruments - Change in FV for Level 3 Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Fair Value Disclosures [Abstract]
Ending balance	$ 117,733	$ 85,822
Contingent consideration recorded at acquisition date	12,012	6,000
Payment of contingent consideration recorded at acquisition date	(11,295)	(1,319)
Adjustments to contingent consideration	0	(637)
Interest accretion expense	1,986	363
Beginning balance	$ 115,030	$ 81,415

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Net Income Per Share Information - Basic and Diluted Net Income Per Common Share (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Numerator:
Net income attributable to Waste Connections for basic and diluted earnings per share	$ 230,054	$ 197,813
Denominator:
Basic shares outstanding	257,801,116	257,372,942
Dilutive effect of equity-based awards	681,357	616,029
Diluted shares outstanding	258,482,473	257,988,971

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10-K - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	$ 105,683	$ 105,639
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	103,773	105,639
Restricted investments	76,929	70,658
Contingent consideration	(117,733)	(115,030)
Fair Value, Measurements, Recurring | Interest Rate Swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative instrument - net	27,374	22,787
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted cash	103,773	105,639
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted investments	76,929	70,658
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	27,374	22,787
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	$ (117,733)	$ (115,030)

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Summary of Significant Accounting Policies - Derivative Financial Instruments - Interest Rate Swaps (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2024 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

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Summary of Significant Accounting Policies - Derivative Financial Instruments - FV of Cash Flow Hedges (Details) - USD ($) $ in Thousands	Mar. 31, 2024		Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, asset derivatives	$ 27,374		$ 22,787
Interest Rate Swap | Prepaid Expenses and Other Current Assets
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, asset derivatives	18,500	[1]	15,842	[2]
Interest Rate Swap | Other Assets
Derivatives, Fair Value [Line Items]
Derivatives designated as cash flow hedges, asset derivatives	$ 8,874		$ 6,945

[1] Represents the estimated amount of the existing unrealized gains on interest rate swaps at March 31, 2024 (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.

[2] 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.

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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified into earnings, net of taxes	$ (3,958)	$ (2,999)
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	7,329	(2,425)
Foreign currency translation adjustment, gross	(56,381)	1,682
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	(56,381)	1,682
Other Comprehensive Income (Loss), before Tax	(51,794)	(5,697)
Other Comprehensive Income (Loss), Tax	(1,216)	1,955
Other comprehensive income (loss), net of tax	(53,010)	(3,742)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified into earnings, net of taxes	(3,958)	(2,999)
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	7,329	(2,425)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	(56,381)	1,682
Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest rate swap amounts reclassified into interest expense	(5,385)	(4,080)
Amounts reclassified, tax	1,427	1,081
Amounts reclassified into earnings, net of taxes	(3,958)	(2,999)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	9,972	(3,299)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	(2,643)	874
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	$ 7,329	$ (2,425)

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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other Comprehensive Income (Loss) [Abstract]
Foreign currency translation adjustment, gross	$ (56,381)	$ 1,682
Foreign currency translation adjustment, net	$ (56,381)	$ 1,682

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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount of Gain or (Loss) Recognized from AOCIL into Earnings, Net of Tax	$ 3,958	$ 2,999
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	7,329	(2,425)
Foreign currency translation adjustment, gross	(56,381)	1,682
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	(56,381)	1,682
Other Comprehensive Income (Loss), before Tax	(51,794)	(5,697)
Other Comprehensive Income (Loss), Tax	1,216	(1,955)
Other comprehensive income (loss), net of tax	(53,010)	(3,742)
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	3,958	2,999
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	7,329	(2,425)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Total	(56,381)	1,682
Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest rate swap amounts reclassified into interest expense	(5,385)	(4,080)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax	(1,427)	(1,081)
Amount of Gain or (Loss) Recognized from AOCIL into Earnings, Net of Tax	3,958	2,999
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax	9,972	(3,299)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax	(2,643)	874
Amount of Gain or (Loss) Recognized as AOCIL on Derivatives, Net of Tax	$ 7,329	$ (2,425)

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Other Comprehensive Income (Loss) - Amounts Included in AOCIL (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance	$ 7,692,809
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(56,381)	$ 1,682
Stockholders' Equity Attributable to Parent, Ending Balance	7,786,915
Foreign currency translation adjustment	(56,381)	1,682
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance	(9,826)	(56,830)
Amounts reclassified into earnings	(3,958)	2,999
Change in fair value	7,329	(2,425)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(56,381)	1,682
Stockholders' Equity Attributable to Parent, Ending Balance	(62,836)	(60,572)
Foreign currency translation adjustment	(56,381)	1,682
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance	16,749	23,378
Amounts reclassified into earnings	(3,958)	2,999
Change in fair value	7,329	(2,425)
Stockholders' Equity Attributable to Parent, Ending Balance	20,120	17,954
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance	(26,575)	(80,208)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax	(56,381)	1,682
Stockholders' Equity Attributable to Parent, Ending Balance	(82,956)	(78,526)
Foreign currency translation adjustment	$ (56,381)	$ 1,682

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Other Comprehensive Income (Loss) - Amounts Included in AOCIL (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Other Comprehensive Income (Loss) [Abstract]
Foreign currency translation adjustment	$ (56,381)	$ 1,682

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Other Comprehensive Income (Loss) - Amounts Included in AOCIL (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance	$ 7,692,809
Foreign currency translation adjustment	(56,381)	$ 1,682
Stockholders' Equity Attributable to Parent, Ending Balance	7,786,915
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance	(9,826)	(56,830)
Amounts reclassified into earnings	(3,958)	2,999
Change in fair value	7,329	(2,425)
Foreign currency translation adjustment	(56,381)	1,682
Stockholders' Equity Attributable to Parent, Ending Balance	(62,836)	(60,572)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Interest Rate Swap
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance	16,749	23,378
Amounts reclassified into earnings	(3,958)	2,999
Change in fair value	7,329	(2,425)
Stockholders' Equity Attributable to Parent, Ending Balance	20,120	17,954
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent | Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Stockholders' Equity Attributable to Parent, Beginning Balance	(26,575)	(80,208)
Foreign currency translation adjustment	(56,381)	1,682
Stockholders' Equity Attributable to Parent, Ending Balance	$ (82,956)	$ (78,526)

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Shareholders' Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		3 Months Ended		6 Months Ended	7 Months Ended	84 Months Ended
	Oct. 31, 2023	Sep. 30, 2023	Mar. 31, 2024	Mar. 31, 2023	Jul. 31, 2023	Dec. 31, 2016	Dec. 31, 2023	Jul. 25, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of shares under employee share purchase plan			$ 2,183	$ 1,841
Issuance of shares under employee share purchase plan, shares			15,407	14,594
Common shares, shares issued			258,019,417				257,659,921
Average daily trading volume during period					252,412
Repurchase of common stock (shares)			0	0
Aggregate cost of common stock repurchase
Maximum remaining number of shares available for repurchase			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)			25.00%
Cash dividend per share	$ 0.285	$ 0.255	$ 0.285	$ 0.255
Cash dividend per common share, increase	$ 0.03
Cash dividends on common stock			$ 73,573	$ 65,788
2020 Employee Share Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum percent of eligible compensation to purchase shares			1.00%
Maximum percent of eligible compensation to purchase shares			10.00%
Maximum number of share authorized to be issued under plan			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			85.00%
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			95.00%
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of award			$ 164.63
Units granted in period			361,108
Vested deferred RSUs outstanding			29,980	62,201
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			$ 138.29
Units granted in period			113,166
Performance Shares | 2024 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, 2026
Deferred Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average grant-date fair value of award			$ 167.56
Units granted in period			3,363
Vested deferred RSUs outstanding			33,844				30,481
Progressive Waste Solutions Ltd. | Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested deferred RSUs outstanding			50,062				51,812

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Shareholders' Equity - Restricted Share Units (RSUs) Activity Schedule (Details)	3 Months Ended
	Mar. 31, 2024 shares
Restricted Stock Units (RSUs)
Unvested shares
Outstanding, shares at beginning	936,267
Granted	361,108
Forfeited	(16,114)
Vested and issued	(329,996)
Outstanding at ending	29,980
Outstanding, shares at ending	951,265
Performance Shares
Unvested shares
Outstanding, shares at beginning	259,532
Granted	113,166
Vested and issued	(153,555)
Outstanding, shares at ending	219,143
Progressive Waste Solutions Ltd. | Restricted Stock Units (RSUs)
Unvested shares
Outstanding at beginning	51,812
Cash settled	(1,750)
Outstanding at ending	50,062

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Shareholders' Equity - Restricted Stock Units Activity (Details)	3 Months Ended
	Mar. 31, 2024 $ / 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	361,108
Weighted average grant-date fair value of award | $ / shares	$ 164.63
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	113,166
Weighted average grant-date fair value of award | $ / shares	$ 138.29
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	3,363
Weighted average grant-date fair value of award | $ / shares	$ 167.56

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10-K Shareholders' Equity (Summary of Activity Related to Restricted Stock Units) (Details)	3 Months Ended
	Mar. 31, 2024 $ / shares shares
Restricted Stock Units (RSUs)
Unvested shares
Outstanding, shares at beginning	936,267
Granted	361,108
Forfeited	(16,114)
Vested and issued	329,996
Outstanding at ending	29,980
Outstanding, shares at ending	951,265
Weighted-Average Grant Date Fair Value Per Share
Granted | $ / shares	$ 164.63
Performance Shares
Unvested shares
Outstanding, shares at beginning	259,532
Granted	113,166
Vested and issued	153,555
Outstanding, shares at ending	219,143
Weighted-Average Grant Date Fair Value Per Share
Granted | $ / shares	$ 138.29
Deferred Share Units
Unvested shares
Outstanding at beginning	30,481
Granted	3,363
Outstanding at ending	33,844
Weighted-Average Grant Date Fair Value Per Share
Granted | $ / shares	$ 167.56
Progressive Waste Solutions Ltd. | Restricted Stock Units (RSUs)
Unvested shares
Outstanding at beginning	51,812
Cash settled	(1,750)
Outstanding at ending	50,062

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Shareholders' Equity - Summary of Warrant and Deferred Share Unit Activity (Details) - Deferred Share Units	3 Months Ended
	Mar. 31, 2024 shares
Warrant
Outstanding at beginning	30,481
Granted	3,363
Outstanding at ending	33,844

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Shareholders' Equity - Summary of Vesting Activity Related to Restricted Share Units (Details) - Restricted Stock Units (RSUs)	3 Months Ended
	Mar. 31, 2024 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vested over remaining service period	329,996
Forfeited	(16,114)
Progressive Waste Solutions Ltd.
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cash settled	(1,750)

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Shareholders' Equity - Vesting Activity Related RSUs (Details) - Restricted Stock Units (RSUs)	3 Months Ended
	Mar. 31, 2024 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Forfeited	(16,114)
Progressive Waste Solutions Ltd.
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cash settled	(1,750)

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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, 2023 T	Mar. 31, 2024 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					2.5
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

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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, 2023 T	Mar. 31, 2024 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					2.5
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

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Subsequent Events (Details)		3 Months Ended
	Apr. 24, 2024 $ / shares	Mar. 31, 2024 segment
Subsequent Event [Line Items]
Number of Operating Segments | segment		6
Subsequent Event
Subsequent Event [Line Items]
Dividends, date of record	May 08, 2024
Dividends, date to be paid	May 23, 2024
Dividends per share amount | $ / shares	$ 0.285
Dividends, declared date	Apr. 24, 2024