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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 642,903	$ 181,242
United States
Disaggregation of Revenue [Line Items]
Revenue	537,231	166,747
United Kingdom
Disaggregation of Revenue [Line Items]
Revenue	39,813	4,705
Other
Disaggregation of Revenue [Line Items]
Revenue	65,859	9,790
Digital Transformation
Disaggregation of Revenue [Line Items]
Revenue	210,809	63,354
Creativity and Communications
Disaggregation of Revenue [Line Items]
Revenue	279,242	23,265
Performance Media and Data
Disaggregation of Revenue [Line Items]
Revenue	99,776	62,716
Consumer Insights and Strategy
Disaggregation of Revenue [Line Items]
Revenue	$ 53,076	$ 31,907

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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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