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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]      
Revenue $ 3,629.6 $ 3,587.4  
Unbilled fees and costs 782.9 757.6 $ 546.3
Media, production and other costs 595.1 592.1 564.3
Contract asset (Work in process): 1,378.0 1,349.7 1,110.6
Contract liability (Customer advances) 1,214.3 1,176.6 $ 1,266.7
North America      
Disaggregation of Revenue [Line Items]      
Revenue 1,985.7 2,139.3  
Latin America      
Disaggregation of Revenue [Line Items]      
Revenue 108.4 106.6  
Europe      
Disaggregation of Revenue [Line Items]      
Revenue 1,070.1 887.6  
Middle East and Africa      
Disaggregation of Revenue [Line Items]      
Revenue 73.4 78.9  
Asia Pacific      
Disaggregation of Revenue [Line Items]      
Revenue 392.0 375.0  
United States      
Disaggregation of Revenue [Line Items]      
Revenue 1,881.0 2,011.7  
Advertising      
Disaggregation of Revenue [Line Items]      
Revenue 1,901.3 1,929.0  
CRM Consumer Experience      
Disaggregation of Revenue [Line Items]      
Revenue 634.9 613.5  
CRM Execution & Support      
Disaggregation of Revenue [Line Items]      
Revenue 508.6 489.3  
Public Relations      
Disaggregation of Revenue [Line Items]      
Revenue 346.3 335.1  
Healthcare      
Disaggregation of Revenue [Line Items]      
Revenue 238.5 $ 220.5  
2018 Excluding Impact of Adoption of ASC 606      
Disaggregation of Revenue [Line Items]      
Revenue 3,672.1    
2018 Excluding Impact of Adoption of ASC 606 | North America      
Disaggregation of Revenue [Line Items]      
Revenue 2,022.8    
2018 Excluding Impact of Adoption of ASC 606 | Latin America      
Disaggregation of Revenue [Line Items]      
Revenue 108.1    
2018 Excluding Impact of Adoption of ASC 606 | Europe      
Disaggregation of Revenue [Line Items]      
Revenue 1,075.7    
2018 Excluding Impact of Adoption of ASC 606 | Middle East and Africa      
Disaggregation of Revenue [Line Items]      
Revenue 73.4    
2018 Excluding Impact of Adoption of ASC 606 | Asia Pacific      
Disaggregation of Revenue [Line Items]      
Revenue 392.1    
2018 Excluding Impact of Adoption of ASC 606 | Advertising      
Disaggregation of Revenue [Line Items]      
Revenue 1,908.9    
2018 Excluding Impact of Adoption of ASC 606 | CRM Consumer Experience      
Disaggregation of Revenue [Line Items]      
Revenue 668.2    
2018 Excluding Impact of Adoption of ASC 606 | CRM Execution & Support      
Disaggregation of Revenue [Line Items]      
Revenue 510.1    
2018 Excluding Impact of Adoption of ASC 606 | Public Relations      
Disaggregation of Revenue [Line Items]      
Revenue 346.4    
2018 Excluding Impact of Adoption of ASC 606 | Healthcare      
Disaggregation of Revenue [Line Items]      
Revenue $ 238.5