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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]          
Revenue $ 3,859.6 $ 3,790.1 $ 7,489.2 $ 7,377.6  
Unbilled fees and costs 709.2 752.7 709.2 752.7 $ 546.3
Media, production and other costs 644.3 648.9 644.3 648.9 564.3
Contract assets (Work in process): 1,353.5 1,401.6 1,353.5 1,401.6 1,110.6
Contract liabilities (Customer advances) 1,147.1 1,141.1 1,147.1 1,141.1 $ 1,266.7
North America          
Disaggregation of Revenue [Line Items]          
Revenue 2,097.4 2,175.6 4,083.1 4,314.9  
Latin America          
Disaggregation of Revenue [Line Items]          
Revenue 115.1 121.2 223.5 227.8  
Europe          
Disaggregation of Revenue [Line Items]          
Revenue 1,142.6 1,012.5 2,212.7 1,900.2  
Middle East and Africa          
Disaggregation of Revenue [Line Items]          
Revenue 70.2 75.5 143.6 154.4  
Asia Pacific          
Disaggregation of Revenue [Line Items]          
Revenue 434.3 405.3 826.3 780.3  
Advertising          
Disaggregation of Revenue [Line Items]          
Revenue 2,067.6 2,027.2 3,968.9 3,956.2  
CRM Consumer Experience          
Disaggregation of Revenue [Line Items]          
Revenue 660.0 654.7 1,294.9 1,268.3  
CRM Execution & Support          
Disaggregation of Revenue [Line Items]          
Revenue 498.7 517.3 1,007.2 1,006.6  
Public Relations          
Disaggregation of Revenue [Line Items]          
Revenue 362.7 350.3 709.1 685.4  
Healthcare          
Disaggregation of Revenue [Line Items]          
Revenue 270.6 $ 240.6 509.1 $ 461.1  
Amounts without the Adoption of ASC 606          
Disaggregation of Revenue [Line Items]          
Revenue 3,908.6   7,580.6    
Amounts without the Adoption of ASC 606 | North America          
Disaggregation of Revenue [Line Items]          
Revenue 2,144.6   4,167.3    
Amounts without the Adoption of ASC 606 | Latin America          
Disaggregation of Revenue [Line Items]          
Revenue 115.2   223.3    
Amounts without the Adoption of ASC 606 | Europe          
Disaggregation of Revenue [Line Items]          
Revenue 1,145.2   2,220.8    
Amounts without the Adoption of ASC 606 | Middle East and Africa          
Disaggregation of Revenue [Line Items]          
Revenue 70.2   143.6    
Amounts without the Adoption of ASC 606 | Asia Pacific          
Disaggregation of Revenue [Line Items]          
Revenue 433.4   825.6    
Amounts without the Adoption of ASC 606 | Advertising          
Disaggregation of Revenue [Line Items]          
Revenue 2,073.8   3,982.7    
Amounts without the Adoption of ASC 606 | CRM Consumer Experience          
Disaggregation of Revenue [Line Items]          
Revenue 704.1   1,372.3    
Amounts without the Adoption of ASC 606 | CRM Execution & Support          
Disaggregation of Revenue [Line Items]          
Revenue 497.2   1,007.1    
Amounts without the Adoption of ASC 606 | Public Relations          
Disaggregation of Revenue [Line Items]          
Revenue 362.9   709.3    
Amounts without the Adoption of ASC 606 | Healthcare          
Disaggregation of Revenue [Line Items]          
Revenue $ 270.6   $ 509.2