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Income (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Numerator
Net loss attributable to Stagwell Inc. common shareholders	$ (4,545)	$ (4,545)
Denominator
Basic weighted average number of common shares outstanding (in shares)	76,105,807	76,105,807
Basic (in dollars per share)	$ (0.06)	$ (0.06)
Diluted weighted average number of common shares outstanding (in shares)	76,105,807	76,105,807
Diluted (in dollars per share)	$ (0.06)	$ (0.06)
Anti-dilutive stock awards	179,970,051	179,970,051

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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