Document and Entity Information Document - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2023	Feb. 15, 2024	Jun. 30, 2023
DEI [Abstract]
Document Annual Report	true
Document Information [Line Items]
Document Type	10-K
Document Period End Date	Dec. 31, 2023
Document Transition Report	false
Entity File Number	1-6686
Entity Registrant Name	INTERPUBLIC GROUP OF COMPANIES, INC.
Entity Incorporation, State or Country Code	DE
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
Title of 12(b) Security	Common Stock, par value $0.10 per share
Trading Symbol	IPG
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		378,725,237
Entity Central Index Key	0000051644
Current Fiscal Year End Date	--12-31
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Public Float			$ 14.9
ICFR Auditor Attestation Flag	true