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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Disaggregation of Revenue [Line Items]          
Revenue $ 3,571.6 $ 2,800.7 $ 6,998.6 $ 6,207.6  
Contract assets and unbilled fees and costs 577.5 660.6 577.5 660.6 $ 501.1
Media and production costs 540.1 498.0 540.1 498.0 600.1
Work in process: 1,117.6 1,158.6 1,117.6 1,158.6 1,101.2
Customer advances 1,287.2 1,070.0 1,287.2 1,070.0 $ 1,361.3
North America          
Disaggregation of Revenue [Line Items]          
Revenue 1,957.4 1,664.0 3,929.9 3,661.3  
UNITED STATES          
Disaggregation of Revenue [Line Items]          
Revenue 1,840.7 1,587.4 3,708.9 3,481.7  
Latin America          
Disaggregation of Revenue [Line Items]          
Revenue 70.4 54.9 133.7 126.3  
Europe          
Disaggregation of Revenue [Line Items]          
Revenue 1,044.1 727.5 1,985.1 1,650.8  
Middle East and Africa          
Disaggregation of Revenue [Line Items]          
Revenue 52.3 34.5 102.5 90.1  
Asia-Pacific          
Disaggregation of Revenue [Line Items]          
Revenue 447.4 319.8 847.4 679.1  
Advertising          
Disaggregation of Revenue [Line Items]          
Revenue 2,014.5 1,530.1 4,018.2 3,463.4  
CRM Precision Marketing          
Disaggregation of Revenue [Line Items]          
Revenue 293.6 214.0 563.0 446.0  
CRM Commerce and Brand Consulting          
Disaggregation of Revenue [Line Items]          
Revenue 221.5 187.7 436.1 408.6  
CRM Experiential          
Disaggregation of Revenue [Line Items]          
Revenue 124.0 78.5 212.4 209.8  
CRM Execution & Support          
Disaggregation of Revenue [Line Items]          
Revenue 250.9 192.8 497.5 466.5  
Public Relations          
Disaggregation of Revenue [Line Items]          
Revenue 345.9 298.1 663.4 631.8  
Healthcare          
Disaggregation of Revenue [Line Items]          
Revenue $ 321.2 $ 299.5 $ 608.0 $ 581.5