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Revenue (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Revenue $ 14,289.4 $ 13,171.1 $ 14,953.7
Contract assets and unbilled fees and costs 469.9 501.1  
Media and production costs 731.1 600.1  
Work in process: 1,201.0 1,101.2  
Customer advances 1,644.5 1,361.3  
North America      
Disaggregation of Revenue [Line Items]      
Revenue 7,709.7 7,577.1 8,478.8
UNITED STATES      
Disaggregation of Revenue [Line Items]      
Revenue 7,245.9 7,186.1  
Latin America      
Disaggregation of Revenue [Line Items]      
Revenue 296.1 275.4 403.4
Europe      
Disaggregation of Revenue [Line Items]      
Revenue 4,219.6 3,607.7 4,107.4
Middle East and Africa      
Disaggregation of Revenue [Line Items]      
Revenue 267.6 207.2 314.6
Asia-Pacific      
Disaggregation of Revenue [Line Items]      
Revenue 1,796.4 1,503.7 1,649.5
Advertising      
Disaggregation of Revenue [Line Items]      
Revenue 7,959.3 7,511.4 8,664.2
Precision Marketing      
Disaggregation of Revenue [Line Items]      
Revenue 1,194.8 944.6 927.2
Commerce & Brand Consulting      
Disaggregation of Revenue [Line Items]      
Revenue 910.7 821.8 971.8
Experiential      
Disaggregation of Revenue [Line Items]      
Revenue 545.9 426.8 670.0
Execution & Support      
Disaggregation of Revenue [Line Items]      
Revenue 1,026.6 961.3 1,177.2
Public Relations      
Disaggregation of Revenue [Line Items]      
Revenue 1,391.7 1,310.9 1,386.7
Healthcare      
Disaggregation of Revenue [Line Items]      
Revenue $ 1,260.4 $ 1,194.3 $ 1,156.6