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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Disaggregation of Revenue [Line Items]      
Revenue $ 3,410.3 $ 3,426.9  
Contract assets and unbilled fees and costs 662.5 626.0 $ 469.9
Media and production costs 654.3 512.7 731.1
Work in process: 1,316.8 1,138.7 1,201.0
Customer advances 1,463.8 1,278.0 $ 1,644.5
North America      
Disaggregation of Revenue [Line Items]      
Revenue 1,839.0 1,972.5  
UNITED STATES      
Disaggregation of Revenue [Line Items]      
Revenue 1,724.6 1,868.1  
Latin America      
Disaggregation of Revenue [Line Items]      
Revenue 67.7 63.2  
Europe      
Disaggregation of Revenue [Line Items]      
Revenue 992.0 941.0  
Middle East and Africa      
Disaggregation of Revenue [Line Items]      
Revenue 81.9 50.2  
Asia-Pacific      
Disaggregation of Revenue [Line Items]      
Revenue 429.7 400.0  
Advertising & Media      
Disaggregation of Revenue [Line Items]      
Revenue 1,769.4 2,003.7  
Precision Marketing      
Disaggregation of Revenue [Line Items]      
Revenue 336.1 269.5  
Commerce & Brand Consulting      
Disaggregation of Revenue [Line Items]      
Revenue 237.9 214.5  
Experiential      
Disaggregation of Revenue [Line Items]      
Revenue 142.5 88.4  
Execution & Support      
Disaggregation of Revenue [Line Items]      
Revenue 254.3 246.6  
Public Relations      
Disaggregation of Revenue [Line Items]      
Revenue 360.9 317.5  
Healthcare      
Disaggregation of Revenue [Line Items]      
Revenue $ 309.2 $ 286.7