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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Revenues	$ 706,818	$ 671,168	$ 1,358,558	$ 1,341,227
United States
Disaggregation of Revenue [Line Items]
Revenues	557,395	551,080	1,070,013	1,114,730
Other
Disaggregation of Revenue [Line Items]
Revenues	111,372	79,573	212,610	148,221
UNITED KINGDOM
Disaggregation of Revenue [Line Items]
Revenues	38,051	40,515	75,935	78,276
Digital Transformation
Disaggregation of Revenue [Line Items]
Revenues	125,947	125,342	242,413	241,101
Creativity and Communications
Disaggregation of Revenue [Line Items]
Revenues	340,762	316,761	643,796	608,414
Performance Media and Data
Disaggregation of Revenue [Line Items]
Revenues	112,368	116,541	222,185	273,561
Consumer Insights and Strategy
Disaggregation of Revenue [Line Items]
Revenues	49,655	47,717	98,546	93,486
Stagwell Marketing Cloud Group
Disaggregation of Revenue [Line Items]
Revenues	$ 78,086	$ 64,807	$ 151,618	$ 124,665

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