| Cover Page Document | Oct. 21, 2021 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Entity Registrant Name | INTERPUBLIC GROUP OF COMPANIES, INC. |
| Entity Incorporation, State or 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 |
| Title of 12(b) Security | Common Stock, par value $0.10 per share |
| Trading Symbol | IPG |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0000051644 |
| Document Period End Date | Oct. 21, 2021 |
