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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 654,895	$ 617,573	$ 632,265	$ 622,444	$ 2,527,177	$ 2,687,792	$ 1,469,363
United States
Disaggregation of Revenue [Line Items]
Revenues					2,048,229	2,218,681	1,219,816
Other
Disaggregation of Revenue [Line Items]
Revenues					316,630	287,347	143,586
UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues					162,318	181,764	105,961
Digital Transformation
Disaggregation of Revenue [Line Items]
Revenues					636,624	773,677	373,657
Creativity and Communications
Disaggregation of Revenue [Line Items]
Revenues					1,160,178	1,222,289	591,062
Performance Media and Data
Disaggregation of Revenue [Line Items]
Revenues					295,247	279,903	193,476
Consumer Insights and Strategy
Disaggregation of Revenue [Line Items]
Revenues					199,260	212,869	162,733
Stagwell Marketing Cloud Group
Disaggregation of Revenue [Line Items]
Revenues					$ 235,868	$ 199,054	$ 148,435

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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