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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Disaggregation of Revenue [Line Items]          
REVENUE $ 3,853.8 $ 3,609.9 $ 7,484.3 $ 7,053.2  
Media and production costs 843.9 797.1 843.9 797.1 $ 664.4
Unbilled fees and costs and contract assets 956.1 840.9 956.1 840.9 678.1
Contract assets: 1,800.0 1,638.0 1,800.0 1,638.0 1,342.5
Customer advances 1,262.1 1,159.7 1,262.1 1,159.7 $ 1,356.2
North America          
Disaggregation of Revenue [Line Items]          
REVENUE 2,148.4 1,978.8 4,189.3 3,905.6  
UNITED STATES          
Disaggregation of Revenue [Line Items]          
REVENUE 2,033.4 1,850.6 3,959.3 3,662.8  
Latin America          
Disaggregation of Revenue [Line Items]          
REVENUE 106.4 84.6 202.9 158.6  
Europe          
Disaggregation of Revenue [Line Items]          
REVENUE 1,101.9 1,045.6 2,107.7 1,997.5  
Middle East and Africa          
Disaggregation of Revenue [Line Items]          
REVENUE 65.6 62.6 145.2 147.5  
Asia-Pacific          
Disaggregation of Revenue [Line Items]          
REVENUE 431.5 438.3 839.2 844.0  
Advertising & Media          
Disaggregation of Revenue [Line Items]          
REVENUE 2,046.8 1,911.5 3,953.6 3,688.0  
Precision Marketing          
Disaggregation of Revenue [Line Items]          
REVENUE 438.8 369.0 877.0 729.0  
Public Relations          
Disaggregation of Revenue [Line Items]          
REVENUE 418.2 393.6 808.5 769.1  
Healthcare          
Disaggregation of Revenue [Line Items]          
REVENUE 353.1 349.3 676.7 667.7  
Branding & Retail Commerce          
Disaggregation of Revenue [Line Items]          
REVENUE 199.3 210.5 399.5 420.1  
Experiential          
Disaggregation of Revenue [Line Items]          
REVENUE 186.1 164.4 346.0 312.2  
Execution & Support          
Disaggregation of Revenue [Line Items]          
REVENUE $ 211.5 $ 211.6 $ 423.0 $ 467.1