Basis of Presentation and Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2025
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The accompanying condensed consolidated balance sheet as of September 30, 2025 and December 31, 2024, and the related condensed consolidated statements of income, condensed consolidated statements of comprehensive income, condensed consolidated statements of shareholders' equity for the three and nine months ended September 30, 2025 and 2024 and condensed consolidated statements of cash flows for the nine months ended September 30, 2025 and 2024 of Flowserve Corporation are unaudited. In management’s opinion, all adjustments comprising normal recurring adjustments necessary for fair statement of such condensed consolidated financial statements have been made. The accompanying condensed consolidated financial statements and notes in this Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2025 ("Quarterly Report") are presented as permitted by Regulation S-X and do not contain certain information included in our annual financial statements and notes thereto. Accordingly, the accompanying condensed consolidated financial information should be read in conjunction with the audited consolidated financial statements presented in our Annual Report on Form 10-K for the year ended December 31, 2024 ("2024 Annual Report"). Termination of Merger with Chart Industries, Inc. - As previously disclosed, on June 3, 2025, Flowserve entered into an Agreement and Plan of Merger (the “Merger Agreement”), by and among Flowserve, Big Sur Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of Flowserve (“First Merger Sub”), Napa Merger Sub LLC, a Delaware limited liability company and a direct wholly owned subsidiary of Flowserve (“Second Merger Sub”), and Chart Industries, Inc., a Delaware corporation (“Chart”), which provided that, upon the terms and subject to the conditions set forth therein, First Merger Sub would merge with and into Chart (the “First Merger”), with Chart surviving as a wholly owned subsidiary of Flowserve (the “Initial Surviving Company”) and (ii) immediately following the First Merger, and as part of the same overall transaction as the First Merger, the Initial Surviving Company would merge with and into Second Merger Sub (the “Second Merger”), with Second Merger Sub surviving the Second Merger as a wholly owned subsidiary of Flowserve (collectively, the "Chart Merger"). On July 28, 2025, Flowserve, Chart, First Merger Sub and Second Merger Sub entered into an agreement to terminate the Merger Agreement (the “Mutual Termination Agreement”). Pursuant to the Mutual Termination Agreement, the Merger Agreement was terminated and, in connection therewith, Flowserve received a payment of $266 million dollars in cash on behalf of Chart consisting of (i) the $250 million termination fee payable to Flowserve pursuant to the Merger Agreement and (ii) an additional agreed upon amount of $16 million to reimburse Flowserve for certain expenses. The termination fee is included in Other income (expense), net in our condensed consolidated statements of income and as a part of operating activities within our condensed consolidated statement of cash flows for the period ended September 30, 2025. The Mutual Termination Agreement also provides for the mutual release by each of Flowserve and Chart of all claims relating to or arising out of the Merger Agreement and the transactions contemplated thereby. Pursuant to the Mutual Termination Agreement, Flowserve and Chart have also entered into a letter of intent between Chart and Flowserve to amend an existing supply agreement between them (or their affiliates) to extend the term and to expand the coverage thereof to include certain additional products of Flowserve during such term. We incurred $25.7 million in transaction costs related to the Chart Merger for the three-month period ended September 30, 2025 and $41.2 million for the nine-month period ended September 30, 2025, which are included within selling, general and administrative expense ("SG&A") in our condensed consolidated statements of income.
Accounting developments	Accounting Developments Pronouncements Implemented In August 2023, the FASB issued ASU No. 2023-05, "Business Combinations - Joint Venture Formations (Subtopic 805-60): Recognition and Initial Measurement." The amendments require that newly formed joint ventures measure the net assets and liabilities contributed at fair value. Subsequent measurement is in accordance with the requirements for acquirers of a business in Sections 805-10-35, 805-20-35, and 805-30-35, and other generally accepted accounting principles. The amendments were effective prospectively for all joint venture formations with a formation date on or after January 1, 2025, but companies may elect to apply the amendments retrospectively to joint ventures formed prior to January 1, 2025, if it has sufficient information. The adoption of this ASU did not have a material impact on the Company. Pronouncements Not Yet Implemented In December 2023, the FASB issued ASU No. 2023-09, "Income Taxes (Topic 740)." The amendments require that entities on an annual basis disclose specific categories in the rate reconciliation, provide additional information for reconciling items that meet a quantitative threshold, and disclose specific information about income taxes paid. The amendments eliminate previously required disclosures around changes in unrecognized tax benefits and cumulative amounts of certain temporary differences. The amendments are effective prospectively for annual periods beginning after December 15, 2024. Early adoption is permitted. The amendments may be applied prospectively or retrospectively. We do not expect the impact of this ASU to be material. In November 2024, the FASB issued ASU No. 2024-03, "Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40)." The amendments require disclosure of amounts, in the notes to financial statements, of purchases of inventory, employee compensation, depreciation, intangible asset amortization, and depletion for each income statement line item that contains those expenses. Specified expenses, gains and losses that are already disclosed under existing U.S. GAAP are also required to be included in the disaggregated income statement expense line item disclosure. The amendments also require disclosure of the total amount of selling expenses and the entity's definition of selling expenses. The amendments are effective for annual reporting periods beginning after December 15, 2026. ASU No. 2025-01 on the same topic issued in January 2025 further clarifies the effective date for interim periods. The amendments are effective for interim reporting periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. The amendments may be applied prospectively or retrospectively. We are evaluating the impact of this ASU on our disclosures. In May 2025, the FASB issued ASU No. 2025-03, "Business Combinations (Topic 805) and Consolidation (Topic 810) - Determining the Accounting Acquirer in the Acquisition of a Variable Interest Entity." The amendments require an entity involved in an acquisition transaction effected primarily by exchanging equity interests to consider certain additional factors not required by current U.S. GAAP when the acquiree is a Variable Interest Entity that meets the definition of a business. The amendments are intended to enhance the comparability across entities engaging in acquisition transactions effected primarily by exchanging equity interest when the legal acquiree meets the definition of a business. The amendments are effective prospectively for annual reporting periods beginning after December 15, 2026, and interim reporting periods within those annual reporting periods. Early adoption is permitted. The amendments require prospective application to any acquisition transaction that occurs after the initial application date. We do not expect the adoption of this ASU to have a material impact on the Company or our disclosures and we will evaluate the impact of this ASU if such transaction occurs. In July 2025, the FASB issued ASU No. 2025-05, "Financial Instruments - Credit Losses (Topic 326)."The amendments provide a practical expedient for all entities related to the estimation of expected credit losses for current accounts receivable and current contract assets that arise from transactions accounted for under ASC 606. Under the update, an entity who elects the practical expedient assumes that current conditions as of the balance sheet date do not change for the remaining life of the asset when developing reasonable and supportable forecasts to estimate expected credit losses. The update also includes an accounting policy election which is not relevant to Flowserve as a public business entity. The amendments are effective prospectively for annual periods beginning after December 15, 2025, and interim reporting periods within those annual reporting periods. Early adoption is permitted. We are evaluating the impact of this ASU on our consolidated financial statements. In September 2025, the FASB issued ASU No. 2025-06, "Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40)." The amendments affect criteria for capitalization of internal-use software costs, removing references to project stages and adding guidance on how an entity should evaluate whether there is significant uncertainty associated with the development activities prior to capitalizing development costs, referred to the “probable-to-complete recognition threshold”. The updates are intended to provide accounting guidance that is neutral to different software development methods used. The amendments also specify that the disclosures in Subtopic 360-10, Property, Plant, and Equipment – Overall, are required for all capitalized internal-use software costs rather than the disclosure requirements in ASC 350-30-50-1 through 50-3, and relocated website development costs guidance to Subtopic 350-40, superseding Subtopic 350-50. The amendments are effective for annual periods beginning after December 15, 2027, and interim periods within those annual reporting periods. Early adoption is permitted. The amendments may be applied prospectively, retrospectively, or in a modified transition approach. We are evaluating the impact of this ASU on our consolidated financial statements.
Fair Value	Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters. Where observable prices or inputs are not available, valuation models may be applied. Assets and liabilities recorded at fair value in our condensed consolidated balance sheets are categorized by hierarchical levels based upon the level of judgment associated with the inputs used to measure their fair values. Recurring fair value measurements are limited to investments in derivative instruments. The fair value measurements of our derivative instruments are determined using models that maximize the use of the observable market inputs including interest rate curves and both forward and spot prices for currencies, and are classified as Level II under the fair value hierarchy. The fair values of our derivatives are included in Note 6, "Derivatives and Hedging Activities." The fair value of the MOGAS related contingent consideration was determined based on contractual provisions set forth in the purchase agreement and was fully paid in the first quarter of 2025. The carrying value of our financial instruments as reflected in our condensed consolidated balance sheets approximates fair value, with the exception of our long-term debt. The estimated fair value of our long-term debt, excluding the Senior Notes, approximates the carrying value and is determined using Level II inputs under the fair value hierarchy. The carrying value of our debt is included in Note 7, "Debt and Finance Lease Obligations" The estimated fair value of our Senior Notes at September 30, 2025 was $917.9 million compared to the carrying value of $992.4 million. The estimated fair value of the Senior Notes is based on Level I quoted market rates. The carrying amounts of our other financial instruments (e.g., cash and cash equivalents, accounts receivable, net, accounts payable and short-term debt) approximated fair value due to their short-term nature at September 30, 2025 and December 31, 2024.

Basis of Presentation and Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2025

The accompanying condensed consolidated balance sheet as of September 30, 2025 and December 31, 2024, and the related condensed consolidated statements of income, condensed consolidated statements of comprehensive income, condensed consolidated statements of shareholders' equity for the three and nine months ended September 30, 2025 and 2024 and condensed consolidated statements of cash flows for the nine months ended September 30, 2025 and 2024 of Flowserve Corporation are unaudited. In management’s opinion, all adjustments comprising normal recurring adjustments necessary for fair statement of such condensed consolidated financial statements have been made.

The accompanying condensed consolidated financial statements and notes in this Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2025 ("Quarterly Report") are presented as permitted by Regulation S-X and do not contain certain information included in our annual financial statements and notes thereto. Accordingly, the accompanying condensed consolidated financial information should be read in conjunction with the audited consolidated financial statements presented in our Annual Report on Form 10-K for the year ended December 31, 2024 ("2024 Annual Report").

Termination of Merger with Chart Industries, Inc. - As previously disclosed, on June 3, 2025, Flowserve entered into an Agreement and Plan of Merger (the “Merger Agreement”), by and among Flowserve, Big Sur Merger Sub, Inc., a Delaware corporation and a direct wholly owned subsidiary of Flowserve (“First Merger Sub”), Napa Merger Sub LLC, a Delaware limited liability company and a direct wholly owned subsidiary of Flowserve (“Second Merger Sub”), and Chart Industries, Inc., a Delaware corporation (“Chart”), which provided that, upon the terms and subject to the conditions set forth therein, First Merger Sub would merge with and into Chart (the “First Merger”), with Chart surviving as a wholly owned subsidiary of Flowserve (the “Initial Surviving Company”) and (ii) immediately following the First Merger, and as part of the same overall transaction as the First Merger, the Initial Surviving Company would merge with and into Second Merger Sub (the “Second Merger”), with Second Merger Sub surviving the Second Merger as a wholly owned subsidiary of Flowserve (collectively, the "Chart Merger").

On July 28, 2025, Flowserve, Chart, First Merger Sub and Second Merger Sub entered into an agreement to terminate the Merger Agreement (the “Mutual Termination Agreement”). Pursuant to the Mutual Termination Agreement, the Merger Agreement was terminated and, in connection therewith, Flowserve received a payment of $266 million dollars in cash on behalf of Chart consisting of (i) the $250 million termination fee payable to Flowserve pursuant to the Merger Agreement and (ii) an additional agreed upon amount of $16 million to reimburse Flowserve for certain expenses. The termination fee is included in Other income (expense), net in our condensed consolidated statements of income and as a part of operating activities within our condensed consolidated statement of cash flows for the period ended September 30, 2025.

The Mutual Termination Agreement also provides for the mutual release by each of Flowserve and Chart of all claims relating to or arising out of the Merger Agreement and the transactions contemplated thereby. Pursuant to the Mutual Termination Agreement, Flowserve and Chart have also entered into a letter of intent between Chart and Flowserve to amend an existing supply agreement between them (or their affiliates) to extend the term and to expand the coverage thereof to include certain additional products of Flowserve during such term. We incurred $25.7 million in transaction costs related to the Chart Merger for the three-month period ended September 30, 2025 and $41.2 million for the nine-month period ended September 30, 2025, which are included within selling, general and administrative expense ("SG&A") in our condensed consolidated statements of income.

Accounting developments

Accounting Developments

Pronouncements Implemented

In August 2023, the FASB issued ASU No. 2023-05, "Business Combinations - Joint Venture Formations (Subtopic 805-60): Recognition and Initial Measurement." The amendments require that newly formed joint ventures measure the net assets and liabilities contributed at fair value. Subsequent measurement is in accordance with the requirements for acquirers of a business in Sections 805-10-35, 805-20-35, and 805-30-35, and other generally accepted accounting principles. The amendments were effective prospectively for all joint venture formations with a formation date on or after January 1, 2025, but companies may elect to apply the amendments retrospectively to joint ventures formed prior to January 1, 2025, if it has sufficient information. The adoption of this ASU did not have a material impact on the Company.

Pronouncements Not Yet Implemented

In December 2023, the FASB issued ASU No. 2023-09, "Income Taxes (Topic 740)." The amendments require that entities on an annual basis disclose specific categories in the rate reconciliation, provide additional information for reconciling items that meet a quantitative threshold, and disclose specific information about income taxes paid. The amendments eliminate previously required disclosures around changes in unrecognized tax benefits and cumulative amounts of certain temporary differences. The amendments are effective prospectively for annual periods beginning after December 15, 2024. Early adoption is permitted. The amendments may be applied prospectively or retrospectively. We do not expect the impact of this ASU to be material.

In November 2024, the FASB issued ASU No. 2024-03, "Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40)." The amendments require disclosure of amounts, in the notes to financial statements, of purchases of inventory, employee compensation, depreciation, intangible asset amortization, and depletion for each income statement line item that contains those expenses. Specified expenses, gains and losses that are already disclosed under existing U.S. GAAP are also required to be included in the disaggregated income statement expense line item disclosure. The amendments also require disclosure of the total amount of selling expenses and the entity's definition of selling expenses. The amendments are effective for annual reporting periods beginning after December 15, 2026. ASU No. 2025-01 on the same topic issued in January 2025 further clarifies the effective date for interim periods. The amendments are effective for interim reporting periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. The amendments may be applied prospectively or retrospectively. We are evaluating the impact of this ASU on our disclosures.

In May 2025, the FASB issued ASU No. 2025-03, "Business Combinations (Topic 805) and Consolidation (Topic 810) - Determining the Accounting Acquirer in the Acquisition of a Variable Interest Entity." The amendments require an entity involved in an acquisition transaction effected primarily by exchanging equity interests to consider certain additional factors not required by current U.S. GAAP when the acquiree is a Variable Interest Entity that meets the definition of a business. The amendments are intended to enhance the comparability across entities engaging in acquisition transactions effected primarily by exchanging equity interest when the legal acquiree meets the definition of a business. The amendments are effective prospectively for annual reporting periods beginning after December 15, 2026, and interim reporting periods within those annual reporting periods. Early adoption is permitted. The amendments require prospective application to any acquisition transaction that occurs after the initial application date. We do not expect the adoption of this ASU to have a material impact on the Company or our disclosures and we will evaluate the impact of this ASU if such transaction occurs.

In July 2025, the FASB issued ASU No. 2025-05, "Financial Instruments - Credit Losses (Topic 326)."The amendments provide a practical expedient for all entities related to the estimation of expected credit losses for current accounts receivable and current contract assets that arise from transactions accounted for under ASC 606. Under the update, an entity who elects the practical expedient assumes that current conditions as of the balance sheet date do not change for the remaining life of the asset when developing reasonable and supportable forecasts to estimate expected credit losses. The update also includes an accounting policy election which is not relevant to Flowserve as a public business entity. The amendments are effective prospectively for annual periods beginning after December 15, 2025, and interim reporting periods within those annual reporting periods. Early adoption is permitted. We are evaluating the impact of this ASU on our consolidated financial statements.

In September 2025, the FASB issued ASU No. 2025-06, "Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40)." The amendments affect criteria for capitalization of internal-use software costs, removing references to project stages and adding guidance on how an entity should evaluate whether there is significant uncertainty associated with the development activities prior to capitalizing development costs, referred to the “probable-to-complete recognition threshold”. The updates are intended to provide accounting guidance that is neutral to different software development methods used. The amendments also specify that the disclosures in Subtopic 360-10, Property, Plant, and Equipment – Overall, are required for all capitalized internal-use software costs rather than the disclosure requirements in ASC 350-30-50-1 through 50-3, and relocated website development costs guidance to Subtopic 350-40, superseding Subtopic 350-50. The amendments are effective for annual periods beginning after December 15, 2027, and interim periods within those annual reporting periods. Early adoption is permitted. The amendments may be applied prospectively, retrospectively, or in a modified transition approach. We are evaluating the impact of this ASU on our consolidated financial statements.

Fair Value

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Where available, fair value is based on observable market prices or parameters or derived from such prices or parameters. Where observable prices or inputs are not available, valuation models may be applied. Assets and liabilities recorded at fair value in our condensed consolidated balance sheets are categorized by hierarchical levels based upon the level of judgment associated with the inputs used to measure their fair values. Recurring fair value measurements are limited to investments in derivative instruments. The fair value measurements of our derivative instruments are determined using models that maximize the use of the observable market inputs including interest rate curves and both forward and spot prices for currencies, and are classified as Level II under the fair value hierarchy. The fair values of our derivatives are included in Note 6, "Derivatives and Hedging Activities." The fair value of the MOGAS related contingent consideration was determined based on contractual provisions set forth in the purchase agreement and was fully paid in the first quarter of 2025.

The carrying value of our financial instruments as reflected in our condensed consolidated balance sheets approximates fair value, with the exception of our long-term debt. The estimated fair value of our long-term debt, excluding the Senior Notes, approximates the carrying value and is determined using Level II inputs under the fair value hierarchy. The carrying value of our debt is included in Note 7, "Debt and Finance Lease Obligations" The estimated fair value of our Senior Notes at September 30, 2025 was $917.9 million compared to the carrying value of $992.4 million. The estimated fair value of the Senior Notes is based on Level I quoted market rates. The carrying amounts of our other financial instruments (e.g., cash and cash equivalents, accounts receivable, net, accounts payable and short-term debt) approximated fair value due to their short-term nature at September 30, 2025 and December 31, 2024.