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Restricted Stock Award, Forfeited Net loss Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Cost of services Cost of Product and Service Sold Net increase in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Trade Receivable Fees paid to Third Party under Receivable Purchase Agreement Fees paid to Third Party for Sales of Receivables Fees paid to Third Party for Sales of Receivables Addition to Tax Receivables Agreement liability related to exchange of Paired Units Addition to Tax Receivables Agreement liability related to exchange of Paired Units Addition to Tax Receivables Agreement liability related to exchange of Paired Units tax benefit not subject to valuation allowances tax benefit not subject to valuation allowances tax benefit not subject to valuation allowances Net loss attributable to Stagwell Inc. common shareholders Net Income (Loss) Attributable to Parent Net Income (Loss) Attributable to Parent Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Statement [Table] Statement [Table] Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment [Member] Loss before equity in earnings of non-consolidated affiliates Income Loss From Continuing Operations Before Equity In Earnings Of Non-consolidated Affiliates Income Loss From Continuing Operations Before Equity In Earnings Of Non-consolidated Affiliates Income (Loss) From Continuing Operations before Equity in Earnings of Non-Consolidated Affiliates Software License Arrangement Software License Arrangement [Member] Stock Issued During Period, Value, Restricted Stock Award, Gross Stock Issued During Period, Value, Restricted Stock Award, Gross Revenue: Revenues [Abstract] Share Capital [Table] Share Capital [Table] Long-term debt, term Long-Term Debt, Term Category of Item Purchased [Axis] Category of Item Purchased [Axis]