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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Disaggregation of Revenue [Line Items]          
Revenue $ 3,435.0 $ 3,206.5 $ 10,433.6 $ 9,414.1  
Contract assets and unbilled fees and costs 596.6 648.0 596.6 648.0 $ 501.1
Media and production costs 653.0 526.4 653.0 526.4 600.1
Work in process: 1,249.6 1,174.4 1,249.6 1,174.4 1,101.2
Customer advances 1,325.8 1,129.5 1,325.8 1,129.5 $ 1,361.3
North America          
Disaggregation of Revenue [Line Items]          
Revenue 1,821.8 1,854.7 5,751.7 5,516.0  
UNITED STATES          
Disaggregation of Revenue [Line Items]          
Revenue 1,705.2 1,762.9 5,414.2 5,244.7  
Latin America          
Disaggregation of Revenue [Line Items]          
Revenue 72.5 61.6 206.1 187.8  
Europe          
Disaggregation of Revenue [Line Items]          
Revenue 1,024.3 875.0 3,009.5 2,525.9  
Middle East and Africa          
Disaggregation of Revenue [Line Items]          
Revenue 58.1 45.2 160.6 135.3  
Asia-Pacific          
Disaggregation of Revenue [Line Items]          
Revenue 458.3 370.0 1,305.7 1,049.1  
Advertising          
Disaggregation of Revenue [Line Items]          
Revenue 1,820.6 1,827.6 5,838.8 5,291.0  
CRM Precision Marketing          
Disaggregation of Revenue [Line Items]          
Revenue 309.4 237.1 872.4 683.1  
CRM Commerce and Brand Consulting          
Disaggregation of Revenue [Line Items]          
Revenue 231.3 194.2 667.4 602.8  
CRM Experiential          
Disaggregation of Revenue [Line Items]          
Revenue 132.7 88.1 345.1 297.9  
CRM Execution & Support          
Disaggregation of Revenue [Line Items]          
Revenue 258.8 235.5 756.3 702.0  
Public Relations          
Disaggregation of Revenue [Line Items]          
Revenue 359.4 325.6 1,022.8 957.4  
Healthcare          
Disaggregation of Revenue [Line Items]          
Revenue $ 322.8 $ 298.4 $ 930.8 $ 879.9