| Document and Entity Information | Mar. 26, 2020 |
| Cover [Abstract] | |
| Entity Registrant Name | INTERPUBLIC GROUP OF COMPANIES, INC. |
| Amendment Flag | false |
| Entity Central Index Key | 0000051644 |
| Document Type | 8-K |
| Document Period End Date | Mar. 26, 2020 |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 1-6686 |
| Entity Tax Identification Number | 13-1024020 |
| Entity Address, Address Line One | 909 Third Avenue |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10022 |
| City Area Code | 212 |
| Local Phone Number | 704-1200 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock, par value $0.10 per share |
| Trading Symbol | IPG |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
