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Noncontrolling and Redeemable Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	$ 1,034		$ 21,573	$ 6,463	$ 55,110
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	1,430	$ (8,135)	3,092	2,085	4,558
Income attributable to noncontrolling interests	2,464		24,665	(8,548)	59,668
Nonredeemable Noncontrolling Interest	423,437			423,437		$ 462,097
Stagwell Global
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	1,001		2,287	1,221	4,083
Income attributable to noncontrolling interests	(2,431)		5,379	864	8,641
Nonredeemable Noncontrolling Interest	29,674			29,674		33,691
Stagwell Media
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	33		19,286	(7,684)	51,027
Income attributable to noncontrolling interests	(33)		$ 19,286	7,684	$ 51,027
Nonredeemable Noncontrolling Interest	$ 393,763			$ 393,763		$ 428,406

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