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Noncontrolling and Redeemable Noncontrolling Interests - Noncontrolling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	$ 10,640	$ 1,034	$ (8,654)	$ (1,480)
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	(47)	1,430	1,519	(2,085)	$ 634
Income attributable to noncontrolling interests	10,593	2,464	10,173	(3,565)
Nonredeemable Noncontrolling Interest	457,860		457,860		468,577
Stagwell Global
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	1,208	1,001	2,804	1,222
Income attributable to noncontrolling interests	(1,161)	2,431	(4,323)	(863)
Nonredeemable Noncontrolling Interest	22,971		22,971		32,362
Stagwell Media
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Nonredeemable Noncontrolling Interest	9,432	33	5,850	(2,702)
Income attributable to noncontrolling interests	(9,432)	$ 33	(5,850)	$ (2,702)
Nonredeemable Noncontrolling Interest	$ 434,889		$ 434,889		$ 436,215

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