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Document and Entity Information - shares	3 Months Ended
Document and Entity Information - shares	Mar. 31, 2020	Apr. 15, 2020
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
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 Description	909 Third Avenue,
Entity Address, City or Town	New York,
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10022
Area Code	(212)
Local Phone Number	704-1200
Title of each class	Common Stock, par value $0.10 per share
Trading Symbol	IPG
Security Exchange Name	NYSE
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 Central Index Key	0000051644
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		389,613,926

Label	Element	Value
Cash pooling guarantees	ipg_Cashpoolingguarantees	$ 205,900,000
Cash pooling guarantees	ipg_Cashpoolingguarantees	207,700,000
Line of Credit Facility, Available Capacity Increase Amount	ipg_LineofCreditFacilityAvailableCapacityIncreaseAmount	$ 250,000,000.0
Performance based cash award vesting period	ipg_Performancebasedcashawardvestingperiod	3 years
Office and related expenses, current	ipg_OfficeAndRelatedExpensesCurrent	$ 21,000,000.0
Office and related expenses, current	ipg_OfficeAndRelatedExpensesCurrent	$ 26,900,000
Discount rate ceiling long-term debt	ipg_Discountrateceilinglongtermdebt	3.50%
Income (Loss) from Continuing Operations before Equity Method Investments and Noncontrolling Interest	ipg_IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsandNoncontrollingInterest	$ 2,800,000
Income (Loss) from Continuing Operations before Equity Method Investments and Noncontrolling Interest	ipg_IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsandNoncontrollingInterest	(9,200,000)
Acquisition obligations	ipg_AcquisitionObligations	32,200,000
Acquisition obligations	ipg_AcquisitionObligations	$ 45,700,000
Discount rate floor contingent acquisition obligations	ipg_Discountratefloorcontingentacquisitionobligations	2.00%
EBITA	ipg_EBITA	$ 99,000,000.0
EBITA	ipg_EBITA	116,000,000.0
EBITA	ipg_EBITA	22,300,000
EBITA	ipg_EBITA	400,000
EBITA	ipg_EBITA	(24,100,000)
EBITA	ipg_EBITA	(44,600,000)
EBITA	ipg_EBITA	97,200,000
EBITA	ipg_EBITA	71,800,000
Changes In Temporary Equity	ipg_ChangesInTemporaryEquity	2,800,000
Changes In Temporary Equity	ipg_ChangesInTemporaryEquity	2,800,000
Changes In Temporary Equity	ipg_ChangesInTemporaryEquity	2,600,000
Changes In Temporary Equity	ipg_ChangesInTemporaryEquity	2,600,000
Cash awards granted during the period target value	ipg_CashAwardsGrantedDuringPeriodTargetValue	43,100,000
Guarantee Obligations Current Carrying Value, CreditFacilities	ipg_GuaranteeObligationsCurrentCarryingValueCreditfacilities	276,400,000
Guarantee Obligations Current Carrying Value, CreditFacilities	ipg_GuaranteeObligationsCurrentCarryingValueCreditfacilities	$ 293,800,000
Margin for base rate advances	ipg_MarginForBaseRateAdvances	0.25%
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Other, before Tax	ipg_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansOtherBeforeTax	$ (1,300,000)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Other, before Tax	ipg_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansOtherBeforeTax	(300,000)
Reclassifications from accumulated other comprehensive loss to earnings, net of tax	ipg_ReclassificationsFromAccumulatedOtherComprehensiveLossToEarningsNetOfTax	1,600,000
Reclassifications from accumulated other comprehensive loss to earnings, net of tax	ipg_ReclassificationsFromAccumulatedOtherComprehensiveLossToEarningsNetOfTax	$ (3,000,000.0)
Commercial paper weighted average interest rate over time	ipg_Commercialpaperweightedaverageinterestrateovertime	2.80%
Restricted cash awards vesting period ceiling	ipg_Restrictedcashawardsvestingperiodceiling	3 years
Changes related to CECL ASU	ipg_ChangesrelatedtoCECLASU	$ (6,600,000)
Changes related to CECL ASU	ipg_ChangesrelatedtoCECLASU	(6,600,000)
Changes related to CECL ASU	ipg_ChangesrelatedtoCECLASU	(6,600,000)
Recovery of Direct Costs Expenses	ipg_RecoveryofDirectCostsExpenses	387,700,000
Recovery of Direct Costs Expenses	ipg_RecoveryofDirectCostsExpenses	$ 356,400,000
Margin for Eurocurrency rate advances	ipg_MarginForEurocurrencyRateAdvances	1.25%
Restricted cash awards vesting period floor	ipg_Restrictedcashawardsvestingperiodfloor	2 years
Changes related to lease standard update	ipg_Changesrelatedtoleasestandardupdate	$ 2,200,000
Changes related to lease standard update	ipg_Changesrelatedtoleasestandardupdate	2,200,000
Changes related to lease standard update	ipg_Changesrelatedtoleasestandardupdate	2,200,000
Commercial paper borrowing capacity	ipg_Commercialpaperborrowingcapacity	1,500,000,000.0
Guarantee Obligations Current Carrying Value, Leases	ipg_GuaranteeObligationsCurrentCarryingValueLeases	713,400,000
Guarantee Obligations Current Carrying Value, Leases	ipg_GuaranteeObligationsCurrentCarryingValueLeases	739,100,000
Average amount borrowed under commercial paper during the period	ipg_Averageamountborrowedundercommercialpaperduringtheperiod	$ 59,900,000
Discount rate ceiling contingent acquisition obligations	ipg_Discountrateceilingcontingentacquisitionobligations	5.00%
Line of Credit Facility, Limits on Letters of Credit	ipg_LineofCreditFacilityLimitsonLettersofCredit	$ 50,000,000.0
Restricted Cash Plan cash awards granted during the period target value	ipg_RestrictedCashPlancashawardsgrantedduringtheperiodtargetvalue	$ 34,500,000
Discount rate floor long-term debt	ipg_Discountratefloorlongtermdebt	0.50%

Acquisitions Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Changes in redemption value of redeemable noncontrolling interests:
Additions	$ 0.0	$ 0.0
Redemption value adjustments	$ (4.5)	$ (0.2)

Supplementary Data Redeemable Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Redeemable Noncontrolling Interests [Abstract]
Noncontrolling interest related to redeemable noncontrolling interests	$ (2.9)	$ (2.8)
Additions	0.0	0.0
Redemption value adjustments	$ (4.5)	$ (0.2)

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Cover Document and Entity Information Notes to Financial Statements Supplementary Data (Notes) Notes Details Acquisitions Redeemable Noncontrolling Interests (Details) Supplementary Data Redeemable Noncontrolling Interests (Details) Uncategorized Uncategorized Items - ipgq1202010q_htm.xml All Reports Rendering Log