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Revenue (Tables) | 9 Months Ended
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Sep. 30, 2020
Disaggregation of Revenue [Line Items] |
Work in Process and Contract Liabilities | Work in process and contract liabilities were (in millions):
| September 30, 2020 |  | December 31, 2019 |  | September 30, 2019
Work in process: |  |  |  |  |
Contract assets and unbilled fees and costs | $ | 648.0 |  |  | $ | 689.2 |  |  | $ | 837.9 |
Media and production costs | 526.4 |  |  | 568.4 |  |  | 590.0 |
| $ | 1,174.4 |  |  | $ | 1,257.6 |  |  | $ | 1,427.9 |
Contract liabilities: |  |  |  |  |
Customer advances | $ | 1,129.5 |  |  | $ | 1,215.3 |  |  | $ | 1,059.2 |
Geographic Markets [Member] |
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue | Revenue in our principal geographic markets was (in millions):
| Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Americas: |  |  |  |  |  |  |
North America | $ | 1,854.7 |  |  | $ | 2,096.5 |  |  | $ | 5,516.0 |  |  | $ | 6,204.1 |
Latin America | 61.6 |  |  | 100.2 |  |  | 187.8 |  |  | 286.0 |
EMEA: |  |  |  |  |  |  |
Europe | 875.0 |  |  | 948.6 |  |  | 2,525.9 |  |  | 2,930.0 |
Middle East and Africa | 45.2 |  |  | 59.6 |  |  | 135.3 |  |  | 199.6 |
Asia-Pacific | 370.0 |  |  | 418.9 |  |  | 1,049.1 |  |  | 1,192.8 |
| $ | 3,206.5 |  |  | $ | 3,623.8 |  |  | $ | 9,414.1 |  |  | $ | 10,812.5 |
Discipline [Member] |
Disaggregation of Revenue [Line Items] |
Disaggregation of Revenue | Revenue by discipline was (in millions):
| Three Months Ended September 30, |  |  |  | Nine Months Ended September 30, |  |
| 2020 |  | 2019 |  | 2020 |  | 2019
Advertising | $ | 1,792.9 |  |  | $ | 2,034.4 |  |  | $ | 5,185.2 |  |  | $ | 6,065.9 |
CRM Consumer Experience | 516.2 |  |  | 629.2 |  |  | 1,578.0 |  |  | 1,881.7 |
CRM Execution & Support | 276.9 |  |  | 337.4 |  |  | 822.8 |  |  | 1,009.6 |
Public Relations | 322.8 |  |  | 337.2 |  |  | 950.2 |  |  | 1,020.6 |
Healthcare | 297.7 |  |  | 285.6 |  |  | 877.9 |  |  | 834.7 |
| $ | 3,206.5 |  |  | $ | 3,623.8 |  |  | $ | 9,414.1 |  |  | $ | 10,812.5 |

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