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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Disaggregation of Revenue [Line Items]          
Revenue $ 3,443.4 $ 3,435.0 $ 10,420.9 $ 10,433.6  
Contract assets and unbilled fees and costs 684.2 596.6 684.2 596.6 $ 469.9
Media and production costs 678.4 653.0 678.4 653.0 731.1
Work in process: 1,362.6 1,249.6 1,362.6 1,249.6 1,201.0
Customer advances 1,358.8 1,325.8 1,358.8 1,325.8 $ 1,644.5
North America          
Disaggregation of Revenue [Line Items]          
Revenue 1,969.0 1,821.8 5,777.5 5,751.7  
UNITED STATES          
Disaggregation of Revenue [Line Items]          
Revenue 1,847.8 1,705.2 5,415.2 5,414.2  
Latin America          
Disaggregation of Revenue [Line Items]          
Revenue 77.3 72.5 224.9 206.1  
Europe          
Disaggregation of Revenue [Line Items]          
Revenue 908.2 1,024.3 2,925.1 3,009.5  
Middle East and Africa          
Disaggregation of Revenue [Line Items]          
Revenue 62.0 58.1 208.8 160.6  
Asia-Pacific          
Disaggregation of Revenue [Line Items]          
Revenue 426.9 458.3 1,284.6 1,305.7  
Advertising & Media          
Disaggregation of Revenue [Line Items]          
Revenue 1,762.4 1,820.6 5,362.8 5,838.8  
Precision Marketing          
Disaggregation of Revenue [Line Items]          
Revenue 361.0 309.4 1,059.1 872.4  
Commerce & Brand Consulting          
Disaggregation of Revenue [Line Items]          
Revenue 239.6 231.3 712.1 667.4  
Experiential          
Disaggregation of Revenue [Line Items]          
Revenue 123.1 132.7 420.2 345.1  
Execution & Support          
Disaggregation of Revenue [Line Items]          
Revenue 239.8 258.8 744.6 756.3  
Public Relations          
Disaggregation of Revenue [Line Items]          
Revenue 391.2 359.4 1,144.3 1,022.8  
Healthcare          
Disaggregation of Revenue [Line Items]          
Revenue $ 326.3 $ 322.8 $ 977.8 $ 930.8