Basis of Presentation and Recent Developments	12 Months Ended
Basis of Presentation and Recent Developments	Dec. 31, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Recent Developments	1. Business and Basis of Presentation Stagwell Inc. (together with its consolidated subsidiaries, unless the context requires otherwise, the “Company,” “we,” or “Stagwell”), incorporated under the laws of Delaware, operates a global network of technology-enabled marketing & advertising, media, data, and technology businesses (“Brands”). We help clients grow by delivering both discrete and integrated products and services, including self-service SaaS and DaaS. Our offerings address needs such as creative, communications strategy, digital transformation, experiences, technology solutions, and market research across its Marketing Services, Communications, Digital Transformation, Media & Commerce, and The Marketing Cloud segments that support clients in navigating change and achieving measurable results in a rapidly evolving business environment. On September 30, 2025, the Company reorganized its organizational structure that aligned our segments. Refer to Note 18 of the Notes included herein for additional information. The accompanying Audited Consolidated Financial Statements include the accounts of Stagwell and its subsidiaries. Stagwell has prepared the Audited Consolidated Financial Statements included herein in accordance with accounting principles generally accepted in the United States (“GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”) for reporting financial information on this Annual Report on Form 10-K (this “Form 10-K”). The preparation of financial statements in conformity with GAAP requires us to make judgments, assumptions and estimates about current and future results of operations and cash flows that affect the amounts reported and disclosed. Actual results could differ from these estimates and assumptions. The accompanying financial statements reflect all adjustments, consisting of normal recurring accruals, which in the opinion of management are necessary for a fair statement, in all material respects, of the information contained therein. Intercompany balances and transactions have been eliminated in consolidation. Certain reclassifications have been made to the prior year financial information to conform to the current year’s presentation. Recent Developments On January 30, 2026, the Company acquired Wavelength, a digital advocacy and communications company, for an estimated purchase price of $10.2 million, of which approximately $4.6 million was paid in cash and approximately $5.6 million was paid in 863,624 shares of the Company’s Class A Common Stock subject to post-closing adjustments. In connection with the acquisition, the sellers are eligible to earn contingent consideration up to a maximum value of $24.8 million, subject to continued employment and meeting certain future earnings targets, of which a portion may be settled in shares of Class A Common Stock, at the Company’s discretion. On March 4, 2026, the Board authorized an extension and a $350.0 million increase in the size of our previously approved stock repurchase program (the “Repurchase Program”). Under the Repurchase Program, as amended, we may repurchase up to an aggregate of $725.0 million of shares of our outstanding Class A Common Stock, with any previous purchases under the Repurchase Program continuing to count against that limit. The Repurchase Program will expire on March 4, 2029. On March 11, 2026, pursuant to a resolution approved by independent members of the Board of Directors (“Board”), the Company repurchased 6,198,425 shares of Class A common stock, par value $0.001 per share (“Class A Common Stock”), at a price of $6.1677 per share, for a total of $38.2 million. The shares were purchased from executive officers and other employees to satisfy their tax obligations resulting from the Class C Exchange as described in Note 12 of the Notes included herein.