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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Disaggregation of Revenue [Line Items]          
Revenue $ 3,714.3 $ 3,719.5 $ 11,203.5 $ 11,097.1  
Unbilled fees and costs 710.9 799.9 710.9 799.9 $ 546.3
Media, production and other costs 648.3 658.2 648.3 658.2 564.3
Contract assets (Work in process): 1,359.2 1,458.1 1,359.2 1,458.1 1,110.6
Contract liabilities (Customer advances) 1,142.5 1,132.9 1,142.5 1,132.9 $ 1,266.7
North America          
Disaggregation of Revenue [Line Items]          
Revenue 2,095.5 2,107.5 6,178.6 6,422.5  
Latin America          
Disaggregation of Revenue [Line Items]          
Revenue 102.0 117.7 325.6 345.5  
Europe          
Disaggregation of Revenue [Line Items]          
Revenue 1,015.2 1,017.7 3,227.9 2,917.8  
Middle East and Africa          
Disaggregation of Revenue [Line Items]          
Revenue 63.7 65.4 207.2 219.8  
Asia Pacific          
Disaggregation of Revenue [Line Items]          
Revenue 437.9 411.2 1,264.2 1,191.5  
Advertising          
Disaggregation of Revenue [Line Items]          
Revenue 1,992.1 1,952.9 5,961.0 5,909.0  
CRM Consumer Experience          
Disaggregation of Revenue [Line Items]          
Revenue 637.7 634.2 1,932.7 1,902.6  
CRM Execution & Support          
Disaggregation of Revenue [Line Items]          
Revenue 465.6 541.0 1,472.8 1,547.7  
Public Relations          
Disaggregation of Revenue [Line Items]          
Revenue 356.0 353.4 1,065.0 1,038.8  
Healthcare          
Disaggregation of Revenue [Line Items]          
Revenue 262.9 $ 238.0 772.0 $ 699.0  
Amounts without the Adoption of ASC 606          
Disaggregation of Revenue [Line Items]          
Revenue 3,731.4   11,312.0    
Amounts without the Adoption of ASC 606 | North America          
Disaggregation of Revenue [Line Items]          
Revenue 2,118.8   6,286.1    
Amounts without the Adoption of ASC 606 | Latin America          
Disaggregation of Revenue [Line Items]          
Revenue 101.6   325.0    
Amounts without the Adoption of ASC 606 | Europe          
Disaggregation of Revenue [Line Items]          
Revenue 1,010.5   3,231.3    
Amounts without the Adoption of ASC 606 | Middle East and Africa          
Disaggregation of Revenue [Line Items]          
Revenue 63.7   207.2    
Amounts without the Adoption of ASC 606 | Asia Pacific          
Disaggregation of Revenue [Line Items]          
Revenue 436.8   1,262.4    
Amounts without the Adoption of ASC 606 | Advertising          
Disaggregation of Revenue [Line Items]          
Revenue 1,988.1   5,970.8    
Amounts without the Adoption of ASC 606 | CRM Consumer Experience          
Disaggregation of Revenue [Line Items]          
Revenue 658.7   2,031.1    
Amounts without the Adoption of ASC 606 | CRM Execution & Support          
Disaggregation of Revenue [Line Items]          
Revenue 465.6   1,472.7    
Amounts without the Adoption of ASC 606 | Public Relations          
Disaggregation of Revenue [Line Items]          
Revenue 356.1   1,065.3    
Amounts without the Adoption of ASC 606 | Healthcare          
Disaggregation of Revenue [Line Items]          
Revenue $ 262.9   $ 772.1