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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Disaggregation of Revenue [Line Items]          
Revenue $ 3,567.2 $ 3,571.6 $ 6,977.5 $ 6,998.6  
Contract assets and unbilled fees and costs 647.4 577.5 647.4 577.5 $ 469.9
Media and production costs 588.5 540.1 588.5 540.1 731.1
Work in process: 1,235.9 1,117.6 1,235.9 1,117.6 1,201.0
Customer advances 1,372.8 1,287.2 1,372.8 1,287.2 $ 1,644.5
North America          
Disaggregation of Revenue [Line Items]          
Revenue 1,969.5 1,957.4 3,808.5 3,929.9  
UNITED STATES          
Disaggregation of Revenue [Line Items]          
Revenue 1,842.8 1,840.7 3,567.4 3,708.9  
Latin America          
Disaggregation of Revenue [Line Items]          
Revenue 79.9 70.4 147.6 133.7  
Europe          
Disaggregation of Revenue [Line Items]          
Revenue 1,024.9 1,044.1 2,016.9 1,985.1  
Middle East and Africa          
Disaggregation of Revenue [Line Items]          
Revenue 64.9 52.3 146.8 102.5  
Asia-Pacific          
Disaggregation of Revenue [Line Items]          
Revenue 428.0 447.4 857.7 847.4  
Advertising & Media          
Disaggregation of Revenue [Line Items]          
Revenue 1,831.0 2,014.5 3,600.4 4,018.2  
Precision Marketing          
Disaggregation of Revenue [Line Items]          
Revenue 362.0 293.6 698.1 563.0  
Commerce & Brand Consulting          
Disaggregation of Revenue [Line Items]          
Revenue 234.6 221.5 472.5 436.1  
Experiential          
Disaggregation of Revenue [Line Items]          
Revenue 154.6 124.0 297.1 212.4  
Execution & Support          
Disaggregation of Revenue [Line Items]          
Revenue 250.5 250.9 504.8 497.5  
Public Relations          
Disaggregation of Revenue [Line Items]          
Revenue 392.2 345.9 753.1 663.4  
Healthcare          
Disaggregation of Revenue [Line Items]          
Revenue $ 342.3 $ 321.2 $ 651.5 $ 608.0