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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Revenue $ 3,426.9 $ 3,406.9  
Contract assets and unbilled fees and costs 626.0 783.7 $ 501.1
Media and production costs 512.7 529.5 600.1
Work in process: 1,138.7 1,313.2 1,101.2
Customer advances 1,278.0 1,075.7 $ 1,361.3
North America      
Disaggregation of Revenue [Line Items]      
Revenue 1,972.5 1,997.3  
UNITED STATES      
Disaggregation of Revenue [Line Items]      
Revenue 1,868.1 1,894.2  
Latin America      
Disaggregation of Revenue [Line Items]      
Revenue 63.2 71.4  
Europe      
Disaggregation of Revenue [Line Items]      
Revenue 941.0 923.4  
Middle East and Africa      
Disaggregation of Revenue [Line Items]      
Revenue 50.2 55.5  
Asia-Pacific      
Disaggregation of Revenue [Line Items]      
Revenue 400.0 359.3  
Advertising      
Disaggregation of Revenue [Line Items]      
Revenue 2,003.7 1,933.3  
CRM Precision Marketing      
Disaggregation of Revenue [Line Items]      
Revenue 269.5 232.0  
CRM Commerce and Brand Consulting      
Disaggregation of Revenue [Line Items]      
Revenue 214.5 220.9  
CRM Experiential      
Disaggregation of Revenue [Line Items]      
Revenue 88.4 131.3  
CRM Execution & Support      
Disaggregation of Revenue [Line Items]      
Revenue 246.6 273.7  
Public Relations      
Disaggregation of Revenue [Line Items]      
Revenue 317.5 333.7  
Healthcare      
Disaggregation of Revenue [Line Items]      
Revenue $ 286.7 $ 282.0