Nature of Business and Significant Accounting Policies	3 Months Ended
Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business and Significant Accounting Policies	Nature of Business and Significant Accounting Policies Nature of Business SiteOne Landscape Supply, Inc. (hereinafter collectively with all its consolidated subsidiaries referred to as the “Company”) is a wholesale distributor of irrigation supplies, hardscapes (including pavers, natural stone, and blocks), fertilizer and control products (e.g., herbicides), landscape accessories, nursery goods, outdoor lighting, and ice melt products to green industry professionals. The Company also provides value-added consultative services to complement its product offering and to help customers operate and grow their businesses. Substantially all of the Company’s sales are to customers located in the United States of America (“U.S.”), with less than two percent of sales and less than three percent of total assets in Canada for all periods presented. As of March 31, 2024, the Company had over 690 branches. Based on the nature of the Company’s products and customers’ business cycles, sales are significantly higher in the second and third quarters of each fiscal year. Share Repurchase Program On October 20, 2022, the Company’s Board of Directors authorized the Company to repurchase, at any time or from time to time, shares of the Company’s common stock having an aggregate purchase price not to exceed $400.0 million pursuant to a Rule 10b5-1 plan and/or pursuant to open market or accelerated share repurchase arrangements, tender offers, or privately negotiated transactions. The repurchase authorization does not have an expiration date and may be amended, suspended, or terminated by the Company’s Board of Directors at any time. During the three months ended March 31, 2024, there were no shares purchased under the share repurchase program. As of March 31, 2024, the dollar value of shares that may yet be purchased under the share repurchase authorization was $363.6 million. Inflation Reduction Act of 2022 In August 2022, the Inflation Reduction Act of 2022 was enacted, which, among other things, implements a 15% corporate alternative minimum tax on book income of certain large corporations effective for tax years beginning after December 31, 2022, and imposes a 1% excise tax on corporate stock repurchases after December 31, 2022. The Company does not expect the enacted legislation to have a material impact on the Company’s consolidated financial statements and related disclosures. Basis of Financial Statement Presentation The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) as applicable to interim financial reporting. In management’s opinion, the unaudited financial information for the interim periods presented includes all adjustments, consisting of normal recurring accruals necessary for a fair statement of the financial position, results of operations, and cash flows. Certain information and disclosures normally included in the Company’s annual financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). These interim unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K filed with the SEC for the fiscal year ended December 31, 2023. The interim period unaudited financial results for the three-month periods presented are not necessarily indicative of results to be expected for any other interim period or for the entire year. Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported and disclosed in the financial statements and accompanying notes. Actual results could differ from these estimates. Fiscal Year The Company’s fiscal year is a 52- or 53-week period ending on the Sunday nearest to December 31. The fiscal years ending December 29, 2024 (the “2024 Fiscal Year”) and December 31, 2023 (the “2023 Fiscal Year”) both include 52 weeks. Additionally, the Company’s fiscal quarters end on the Sunday nearest to March 31, June 30, and September 30, respectively. The three months ended March 31, 2024 and April 2, 2023 both include 13 weeks. Principles of Consolidation The Company’s consolidated financial statements include the assets and liabilities used in operating the Company’s business, including entities in which the Company owns or controls more than 50% of the voting shares. All of the Company’s subsidiaries are wholly owned. All intercompany balances and transactions have been eliminated in consolidation. Significant Accounting Policies Except as updated by the Recently Issued and Adopted Accounting Pronouncements section below, a description of the Company’s significant accounting policies is included in the Company’s Annual Report on Form 10-K for the 2023 Fiscal Year. Recently Issued and Adopted Accounting Pronouncements In October 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2021-08, “Business Combinations (Topic 805): Accounting for Contract Assets and Contact Liabilities from Contracts with Customers” (“ASU 2021-08”). The guidance requires an acquirer in a business combination to recognize and measure contract assets and liabilities in accordance with ASU 2014-09, Revenue from Contracts with Customers (Topic 606) rather than at fair value. The Company adopted ASU 2021-08 on a prospective basis when it became effective in the first quarter of the 2023 Fiscal Year. The adoption of ASU 2021-08 did not have a material impact on the Company’s consolidated financial statements and related disclosures. In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting” (“ASU 2020-04”), as amended in January 2021 by ASU 2021-01, “Reference Rate Reform (Topic 848): Scope” (“ASU 2021-01”), and in December 2022 by ASU 2022-06, “Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848” (“ASU 2022-06”). •ASU 2020-04 provided optional expedients and exceptions for applying U.S. GAAP to contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria were met. •ASU 2021-01 amended the scope of the guidance in ASU 2020-04 on the facilitation of the effects of reference rate reform on financial reporting. The amendments in ASU 2021-01 clarified that “certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting can apply to derivatives that are affected by the discounting transition”. These amendments applied only to contracts and hedging relationships that reference the London Interbank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued due to reference rate reform. The expedients are applicable to contract modifications made and hedging relationships entered into on or before December 31, 2022. The guidance was permitted to be elected over time as reference rate reform activities occurred. •ASU 2022-06 deferred the expiration date of the reference rate reform relief guidance provided by ASU 2020-04 and ASU 2021-01 to December 31, 2024. The Company previously elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions would be based matches the index for the corresponding derivatives. On March 27, 2023, the Company amended its term loans to implement a forward-looking interest rate based on the secured overnight financing rate (“SOFR”) in lieu of LIBOR. On March 31, 2023, the Company amended the terms of its interest rate swaps to implement SOFR in place of LIBOR. Concurrent with the amendments to its interest rate swaps, the Company elected certain of the optional expedients provided in Topic 848 that allowed the Company to preserve the past presentation of its derivatives without de-designating the existing hedging relationships. The adoption of Topic 848 did not have a material impact on the Company’s consolidated financial statements. Refer to “Note 9. Long-Term Debt” and “Note 4. Fair Value Measurement and Interest Rate Swaps” for additional information regarding these amended agreements. In July 2023, the FASB issued ASU 2023-03, “Presentation of Financial Statements (Topic 205), Income Statement—Reporting Comprehensive Income (Topic 220), Distinguishing Liabilities from Equity (Topic 480), Equity (Topic 505), and Compensation—Stock Compensation (Topic 718)” (“ASU 2023-03”). This ASU amends or supersedes various SEC paragraphs in the Accounting Standards Codification to primarily reflect the issuance of Staff Accounting Bulletin No. 120. ASU 2023-03 provides clarifying guidance related to employee and non-employee share-based payment accounting, including guidance to companies issuing share-based awards shortly before announcing material, nonpublic information to consider such material nonpublic information to adjust observable market prices if the release of material nonpublic information is expected to affect the share price. ASU 2023-03 does not provide new guidance so there is no transition or effective date associated with it. Therefore, these updates were immediately effective. The adoption of ASU 2023-03 did not have a material impact on the Company’s consolidated financial statements and related disclosures. Accounting Pronouncements Issued But Not Yet Adopted In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures” (“ASU 2023-07”), which expands reportable segment disclosure requirements primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 requires disclosure of (i) significant segment expenses that are regularly provided to the CODM and included within the segment measure of profit or loss, (ii) an amount and description of its composition for other segment items to reconcile to segment profit or loss, and (iii) the title and position of the Company’s CODM. The ASU does not change how a public entity identifies its operating segments, aggregates them, or applies the quantitative thresholds to determine its reportable segments. The new standard will be effective on a retrospective basis for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. The Company is currently evaluating the segment disclosure impact of the amended guidance; however, ASU 2023-07 is not expected to have a material impact on its consolidated financial statements. In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” (“ASU 2023-09”). The amendments in ASU 2023-09 require public entities, on an annual basis, to provide disclosure of specific categories in the rate reconciliation, as well as disclosure of income taxes paid disaggregated by jurisdiction. The new standard will be effective on a prospective basis for fiscal years beginning after December 15, 2024 and interim periods therein, with early adoption permitted. The Company is currently evaluating the amended guidance and does not expect the adoption to have a material impact on its consolidated financial statements and related disclosures.

SiteOne Landscape Supply, Inc. (hereinafter collectively with all its consolidated subsidiaries referred to as the “Company”) is a wholesale distributor of irrigation supplies, hardscapes (including pavers, natural stone, and blocks), fertilizer and control products (e.g., herbicides), landscape accessories, nursery goods, outdoor lighting, and ice melt products to green industry professionals. The Company also provides value-added consultative services to complement its product offering and to help customers operate and grow their businesses. Substantially all of the Company’s sales are to customers located in the United States of America (“U.S.”), with less than two percent of sales and less than three percent of total assets in Canada for all periods presented. As of March 31, 2024, the Company had over 690 branches. Based on the nature of the Company’s products and customers’ business cycles, sales are significantly higher in the second and third quarters of each fiscal year.

On October 20, 2022, the Company’s Board of Directors authorized the Company to repurchase, at any time or from time to time, shares of the Company’s common stock having an aggregate purchase price not to exceed $400.0 million pursuant to a Rule 10b5-1 plan and/or pursuant to open market or accelerated share repurchase arrangements, tender offers, or privately negotiated transactions. The repurchase authorization does not have an expiration date and may be amended, suspended, or terminated by the Company’s Board of Directors at any time.

In August 2022, the Inflation Reduction Act of 2022 was enacted, which, among other things, implements a 15% corporate alternative minimum tax on book income of certain large corporations effective for tax years beginning after December 31, 2022, and imposes a 1% excise tax on corporate stock repurchases after December 31, 2022. The Company does not expect the enacted legislation to have a material impact on the Company’s consolidated financial statements and related disclosures.

The accompanying unaudited consolidated financial statements of the Company have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) as applicable to interim financial reporting. In management’s opinion, the unaudited financial information for the interim periods presented includes all adjustments, consisting of normal recurring accruals necessary for a fair statement of the financial position, results of operations, and cash flows. Certain information and disclosures normally included in the Company’s annual financial statements prepared in accordance with U.S. GAAP have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”). These interim unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K filed with the SEC for the fiscal year ended December 31, 2023. The interim period unaudited financial results for the three-month periods presented are not necessarily indicative of results to be expected for any other interim period or for the entire year.

The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the amounts reported and disclosed in the financial statements and accompanying notes. Actual results could differ from these estimates.

The Company’s fiscal year is a 52- or 53-week period ending on the Sunday nearest to December 31. The fiscal years ending December 29, 2024 (the “2024 Fiscal Year”) and December 31, 2023 (the “2023 Fiscal Year”) both include 52 weeks. Additionally, the Company’s fiscal quarters end on the Sunday nearest to March 31, June 30, and September 30, respectively. The three months ended March 31, 2024 and April 2, 2023 both include 13 weeks.

The Company’s consolidated financial statements include the assets and liabilities used in operating the Company’s business, including entities in which the Company owns or controls more than 50% of the voting shares. All of the Company’s subsidiaries are wholly owned. All intercompany balances and transactions have been eliminated in consolidation.

In October 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2021-08, “Business Combinations (Topic 805): Accounting for Contract Assets and Contact Liabilities from Contracts with Customers” (“ASU 2021-08”). The guidance requires an acquirer in a business combination to recognize and measure contract assets and liabilities in accordance with ASU 2014-09, Revenue from Contracts with Customers (Topic 606) rather than at fair value. The Company adopted ASU 2021-08 on a prospective basis when it became effective in the first quarter of the 2023 Fiscal Year. The adoption of ASU 2021-08 did not have a material impact on the Company’s consolidated financial statements and related disclosures.

In March 2020, the FASB issued ASU 2020-04, “Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting” (“ASU 2020-04”), as amended in January 2021 by ASU 2021-01, “Reference Rate Reform (Topic 848): Scope” (“ASU 2021-01”), and in December 2022 by ASU 2022-06, “Reference Rate Reform (Topic 848): Deferral of the Sunset Date of Topic 848” (“ASU 2022-06”).

•ASU 2021-01 amended the scope of the guidance in ASU 2020-04 on the facilitation of the effects of reference rate reform on financial reporting. The amendments in ASU 2021-01 clarified that “certain optional expedients and exceptions in Topic 848 for contract modifications and hedge accounting can apply to derivatives that are affected by the discounting transition”. These amendments applied only to contracts and hedging relationships that reference the London Interbank Offered Rate (“LIBOR”) or another reference rate expected to be discontinued due to reference rate reform. The expedients are applicable to contract modifications made and hedging relationships entered into on or before December 31, 2022. The guidance was permitted to be elected over time as reference rate reform activities occurred.

The Company previously elected to apply the hedge accounting expedients related to probability and the assessments of effectiveness for future LIBOR-indexed cash flows to assume that the index upon which future hedged transactions would be based matches the index for the corresponding derivatives. On March 27, 2023, the Company amended its term loans to implement a forward-looking interest rate based on the secured overnight financing rate (“SOFR”) in lieu of LIBOR. On March 31, 2023, the Company amended the terms of its interest rate swaps to implement SOFR in place of LIBOR. Concurrent with the amendments to its interest rate swaps, the Company elected certain of the optional expedients provided in Topic 848 that allowed the Company to preserve the past presentation of its derivatives without de-designating the existing hedging relationships. The adoption of Topic 848 did not have a material impact on the Company’s consolidated financial statements. Refer to “Note 9. Long-Term Debt” and “Note 4. Fair Value Measurement and Interest Rate Swaps” for additional information regarding these amended agreements.

In July 2023, the FASB issued ASU 2023-03, “Presentation of Financial Statements (Topic 205), Income Statement—Reporting Comprehensive Income (Topic 220), Distinguishing Liabilities from Equity (Topic 480), Equity (Topic 505), and Compensation—Stock Compensation (Topic 718)” (“ASU 2023-03”). This ASU amends or supersedes various SEC paragraphs in the Accounting Standards Codification to primarily reflect the issuance of Staff Accounting Bulletin No. 120. ASU 2023-03 provides clarifying guidance related to employee and non-employee share-based payment accounting, including guidance to companies issuing share-based awards shortly before announcing material, nonpublic information to consider such material nonpublic information to adjust observable market prices if the release of material nonpublic information is expected to affect the share price. ASU 2023-03 does not provide new guidance so there is no transition or effective date associated with it. Therefore, these updates were immediately effective. The adoption of ASU 2023-03 did not have a material impact on the Company’s consolidated financial statements and related disclosures.

In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures” (“ASU 2023-07”), which expands reportable segment disclosure requirements primarily through enhanced disclosures about significant segment expenses. ASU 2023-07 requires disclosure of (i) significant segment expenses that are regularly provided to the CODM and included within the segment measure of profit or loss, (ii) an amount and description of its composition for other segment items to reconcile to segment profit or loss, and (iii) the title and position of the Company’s CODM. The ASU does not change how a public entity identifies its operating segments, aggregates them, or applies the quantitative thresholds to determine its reportable segments. The new standard will be effective on a retrospective basis for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024, with early adoption permitted. The Company is currently evaluating the segment disclosure impact of the amended guidance; however, ASU 2023-07 is not expected to have a material impact on its consolidated financial statements.

In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” (“ASU 2023-09”). The amendments in ASU 2023-09 require public entities, on an annual basis, to provide disclosure of specific categories in the rate reconciliation, as well as disclosure of income taxes paid disaggregated by jurisdiction. The new standard will be effective on a prospective basis for fiscal years beginning after December 15, 2024 and interim periods therein, with early adoption permitted. The Company is currently evaluating the amended guidance and does not expect the adoption to have a material impact on its consolidated financial statements and related disclosures.