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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]                      
Revenue $ 4,086.7 $ 3,714.3 $ 3,859.6 $ 3,629.6 $ 4,176.6 $ 3,719.5 $ 3,790.1 $ 3,587.4 $ 15,290.2 $ 15,273.6 $ 15,416.9
Contract assets and unbilled fees and costs 540.1       546.3       540.1 546.3  
Media and production costs 621.4       564.3       621.4 564.3  
Work in process: 1,161.5       1,110.6       1,161.5 1,110.6  
Customer advances $ 1,159.0       $ 1,266.7       1,159.0 1,266.7  
North America                      
Disaggregation of Revenue [Line Items]                      
Revenue                 8,442.5 8,686.0  
Latin America                      
Disaggregation of Revenue [Line Items]                      
Revenue                 457.5 494.8  
Europe                      
Disaggregation of Revenue [Line Items]                      
Revenue                 4,375.4 4,127.9  
Middle East and Africa                      
Disaggregation of Revenue [Line Items]                      
Revenue                 304.4 314.6  
Asia-Pacific                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,710.4 1,650.3 $ 1,636.2
Advertising                      
Disaggregation of Revenue [Line Items]                      
Revenue                 8,281.0 8,175.9  
CRM Consumer Experience                      
Disaggregation of Revenue [Line Items]                      
Revenue                 2,620.7 2,615.9  
CRM Execution & Support                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,900.5 2,135.8  
Public Relations                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,435.1 1,411.4  
Healthcare                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,052.9 $ 934.6  
Excluding Impact of Adoption of ASC 606                      
Disaggregation of Revenue [Line Items]                      
Revenue                 15,436.3    
Excluding Impact of Adoption of ASC 606 | North America                      
Disaggregation of Revenue [Line Items]                      
Revenue                 8,589.4    
Excluding Impact of Adoption of ASC 606 | Latin America                      
Disaggregation of Revenue [Line Items]                      
Revenue                 456.2    
Excluding Impact of Adoption of ASC 606 | Europe                      
Disaggregation of Revenue [Line Items]                      
Revenue                 4,377.2    
Excluding Impact of Adoption of ASC 606 | Middle East and Africa                      
Disaggregation of Revenue [Line Items]                      
Revenue                 304.4    
Excluding Impact of Adoption of ASC 606 | Asia-Pacific                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,709.1    
Excluding Impact of Adoption of ASC 606 | Advertising                      
Disaggregation of Revenue [Line Items]                      
Revenue                 8,289.1    
Excluding Impact of Adoption of ASC 606 | CRM Consumer Experience                      
Disaggregation of Revenue [Line Items]                      
Revenue                 2,758.3    
Excluding Impact of Adoption of ASC 606 | CRM Execution & Support                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,900.4    
Excluding Impact of Adoption of ASC 606 | Public Relations                      
Disaggregation of Revenue [Line Items]                      
Revenue                 1,435.5    
Excluding Impact of Adoption of ASC 606 | Healthcare                      
Disaggregation of Revenue [Line Items]                      
Revenue                 $ 1,053.0