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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Revenues	$ 632,265	$ 672,913	$ 1,254,709	$ 1,315,816
United States
Disaggregation of Revenue [Line Items]
Revenues	505,445	559,635	1,012,537	1,096,866
United Kingdom
Disaggregation of Revenue [Line Items]
Revenues	47,864	43,363	89,135	83,176
Other
Disaggregation of Revenue [Line Items]
Revenues	78,956	69,915	153,037	135,774
Digital Transformation
Disaggregation of Revenue [Line Items]
Revenues	167,847	197,915	358,166	408,724
Creativity and Communications
Disaggregation of Revenue [Line Items]
Revenues	288,008	307,402	549,362	586,644
Performance Media and Data
Disaggregation of Revenue [Line Items]
Revenues	115,527	114,260	225,015	214,036
Consumer Insights and Strategy
Disaggregation of Revenue [Line Items]
Revenues	$ 60,883	$ 53,336	$ 122,166	$ 106,412

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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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