Basis of Presentation (Policies)	6 Months Ended
Jun. 30, 2026
Accounting Policies [Abstract]
Management's Estimates and Assumptions	Management’s Estimates and Assumptions In preparing our financial statements, we make numerous estimates and assumptions that affect the amounts reported in these financial statements and accompanying notes. We must make these estimates and assumptions because certain information we use is dependent on future events, cannot be calculated with a high degree of precision from data available or simply cannot be readily calculated based on generally accepted methodologies. In preparing our financial statements, the more significant and subjective areas that deal with the greatest amount of uncertainty relate to our accounting for our long-lived assets, including recoverability, landfill development costs and final capping, closure and post-closure costs; our liabilities for potential litigation, claims and assessments; our liabilities for environmental remediation, deferred taxes, uncertain tax positions and insurance reserves; and our estimates of the fair values of assets acquired and liabilities assumed in acquisitions. For more detail on significant accounting policies, refer to Note 2, Summary of Significant Accounting Policies, of the Notes to Consolidated Financial Statements in our Annual Report on Form 10-K for the fiscal year ended December 31, 2025. Our actual results may differ significantly from our estimates.
New Accounting Pronouncements	New Accounting Pronouncements Accounting Standards Adopted Measurement of Credit Losses for Accounts Receivable and Contract Assets In July 2025, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update 2025‑05, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets (ASU 2025‑05), which simplifies the application of the current expected credit loss model for current accounts receivable and current contract assets under Topic 606. In developing reasonable and supportable forecasts as part of estimating expected credit losses, the amendments in this update provide entities with a practical expedient that assumes that the current conditions as of the balance sheet date do not change for the remaining life of the asset. The Company adopted ASU 2025-05 and elected this practical expedient on January 1, 2026. The election of this practical expedient did not have a material impact on our consolidated financial statements. Accounting Standards Updates Issued but not yet Adopted Codification Improvements In December 2025, the FASB issued Accounting Standards Update 2025-12, Codification Improvements: The amendments from this ASU address a range of accounting topics and clarify or make minor improvements to the existing codification. The amendments are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods within those annual reporting periods. Early adoption is permitted. We are currently assessing the effect this guidance may have on our consolidated financial statements. Narrow-Scope Improvements In December 2025, the FASB issued Accounting Standards Update 2025-11, Interim Reporting (Topic 270): Narrow-Scope Improvements. This guidance clarifies interim disclosure requirements and the applicability of Topic 270, resulting in a comprehensive list of interim disclosures required by GAAP and a disclosure principle for disclosing material events since the last reporting period. The amendments are effective for interim reporting periods within annual reporting periods beginning after December 15, 2027. We are currently assessing the effect this guidance may have on our consolidated financial statements. Accounting for Government Grants Received by Business Entities In December 2025, the FASB issued Accounting Standards Update 2025-10, Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities. This ASU adds guidance to Accounting Standards Codification (ASC) 832 on the recognition, measurement, and presentation of government grants. In the absence of such guidance, many for-profit entities historically have analogized to other GAAP, including International Accounting Standards (IAS) 20 or ASC 958-605, when accounting for government grants. This ASU will be effective for annual and interim periods in fiscal years beginning after December 15, 2028. We are currently assessing the effect this guidance may have on our consolidated financial statements. Targeted Improvements to the Accounting for Internal-Use Software In September 2025, the FASB issued Accounting Standards Update 2025-06, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. This guidance removes references to prescriptive and sequential development stages, requiring companies to capitalize internal-use software costs when management commits to funding the software project and it is probable the project will be completed. The amendments are effective for annual reporting periods beginning after December 15, 2027 and interim reporting periods within those annual reporting periods. Entities may apply the guidance using a prospective, retrospective or modified transition approach. We are currently assessing the effect this guidance may have on our consolidated financial statements. Disaggregation of Income Statement Expenses In November 2024, the FASB issued Accounting Standards Update No. 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (ASU 2024-03). ASU 2024-03 requires an entity to disclose the amount of purchases of inventory, employee compensation, depreciation, and intangible asset amortization included in each relevant expense caption. It also requires an entity to include certain amounts that are already required to be disclosed under GAAP in the same disclosure. Additionally, it requires an entity to disclose a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively, and to disclose the total amount of selling expenses and, in annual reporting periods, an entity’s definition of selling expenses. The amendments in ASU 2024-03 are effective for annual reporting periods beginning after December 15, 2026 and interim reporting periods beginning after December 15, 2027, with early adoption permitted. An entity may apply the amendments prospectively for reporting periods after the effective date or retrospectively to any or all prior periods presented in the financial statements. We are currently assessing the effect this guidance may have on our consolidated financial statements. Codification Amendments in Response to the SEC's Disclosure Update and Simplification Initiative In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative, to modify the disclosure or presentation requirements of a variety of topics, which will allow users to more easily compare entities subject to the SEC's existing disclosures with those entities that were not previously subject to the SEC's requirements, and to align the requirements in the FASB accounting standard codification with the SEC's regulations. The effective date for each topic's amendment is the date on which the SEC's removal of the topic's related disclosure from Regulation S-X or Regulation S-K becomes effective, with early adoption prohibited.

Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2026

Management’s Estimates and Assumptions

In preparing our financial statements, we make numerous estimates and assumptions that affect the amounts reported in these financial statements and accompanying notes. We must make these estimates and assumptions because certain information we use is dependent on future events, cannot be calculated with a high degree of precision from data available or simply cannot be readily calculated based on generally accepted methodologies. In preparing our financial statements, the more significant and subjective areas that deal with the greatest amount of uncertainty relate to our accounting for our long-lived assets, including recoverability, landfill development costs and final capping, closure and post-closure costs; our liabilities for potential litigation, claims and assessments; our liabilities for environmental remediation, deferred taxes, uncertain tax positions and insurance reserves; and our estimates of the fair values of assets acquired and liabilities assumed in acquisitions. For more detail on significant accounting policies, refer to Note 2, Summary of Significant Accounting Policies, of the Notes to Consolidated Financial Statements in our Annual Report on Form 10-K for the fiscal year ended December 31, 2025. Our actual results may differ significantly from our estimates.

New Accounting Pronouncements

Accounting Standards Adopted

Measurement of Credit Losses for Accounts Receivable and Contract Assets

In July 2025, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update 2025‑05, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses for Accounts Receivable and Contract Assets (ASU 2025‑05), which simplifies the application of the current expected credit loss model for current accounts receivable and current contract assets under Topic 606. In developing reasonable and supportable forecasts as part of estimating expected credit losses, the amendments in this update provide entities with a practical expedient that assumes that the current conditions as of the balance sheet date do not change for the remaining life of the asset. The Company adopted ASU 2025-05 and elected this practical expedient on January 1, 2026. The election of this practical expedient did not have a material impact on our consolidated financial statements.

Accounting Standards Updates Issued but not yet Adopted

Codification Improvements

In December 2025, the FASB issued Accounting Standards Update 2025-12, Codification Improvements: The amendments from this ASU address a range of accounting topics and clarify or make minor improvements to the existing codification. The amendments are effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods within those annual reporting periods. Early adoption is permitted. We are currently assessing the effect this guidance may have on our consolidated financial statements.

Narrow-Scope Improvements

In December 2025, the FASB issued Accounting Standards Update 2025-11, Interim Reporting (Topic 270): Narrow-Scope Improvements. This guidance clarifies interim disclosure requirements and the applicability of Topic 270, resulting in a comprehensive list of interim disclosures required by GAAP and a disclosure principle for disclosing material events since the last reporting period. The amendments are effective for interim reporting periods within annual reporting periods beginning after December 15, 2027. We are currently assessing the effect this guidance may have on our consolidated financial statements.

Accounting for Government Grants Received by Business Entities

In December 2025, the FASB issued Accounting Standards Update 2025-10, Government Grants (Topic 832): Accounting for Government Grants Received by Business Entities. This ASU adds guidance to Accounting Standards Codification (ASC) 832 on the recognition, measurement, and presentation of government grants. In the absence of such guidance, many for-profit entities historically have analogized to other GAAP, including International Accounting Standards (IAS) 20 or ASC 958-605, when accounting for government grants. This ASU will be effective for annual and interim periods in fiscal years beginning after December 15, 2028. We are currently assessing the effect this guidance may have on our consolidated financial statements.

Targeted Improvements to the Accounting for Internal-Use Software

In September 2025, the FASB issued Accounting Standards Update 2025-06, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. This guidance removes references to prescriptive and sequential development stages, requiring companies to capitalize internal-use software costs when management commits to funding the software project and it is probable the project will be completed. The amendments are effective for annual reporting periods beginning after December 15, 2027 and interim reporting periods within those annual reporting periods. Entities may apply the guidance using a prospective, retrospective or modified transition approach. We are currently assessing the effect this guidance may have on our consolidated financial statements.

Disaggregation of Income Statement Expenses

In November 2024, the FASB issued Accounting Standards Update No. 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (ASU 2024-03). ASU 2024-03 requires an entity to disclose the amount of purchases of inventory, employee compensation, depreciation, and intangible asset amortization included in each relevant expense caption. It also requires an entity to include certain amounts that are already required to be disclosed under GAAP in the same disclosure. Additionally, it requires an entity to disclose a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively, and to disclose the total amount of selling expenses and, in annual reporting periods, an entity’s definition of selling expenses. The amendments in ASU 2024-03 are effective for annual reporting periods beginning

after December 15, 2026 and interim reporting periods beginning after December 15, 2027, with early adoption permitted. An entity may apply the amendments prospectively for reporting periods after the effective date or retrospectively to any or all prior periods presented in the financial statements. We are currently assessing the effect this guidance may have on our consolidated financial statements.

Codification Amendments in Response to the SEC's Disclosure Update and Simplification Initiative

In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative, to modify the disclosure or presentation requirements of a variety of topics, which will allow users to more easily compare entities subject to the SEC's existing disclosures with those entities that were not previously subject to the SEC's requirements, and to align the requirements in the FASB accounting standard codification with the SEC's regulations. The effective date for each topic's amendment is the date on which the SEC's removal of the topic's related disclosure from Regulation S-X or Regulation S-K becomes effective, with early adoption prohibited.