$IPG
INTERPUBLIC GROUP OF COMPANIES, INC. Stock $ipg

$ipg Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000005164421000012 Filed on February 22, 2021

Income Statement

Concept	2020 Q4	2020 Q3	2020 Q2
Revenue	$2.550B	$2.126B	$2.026B
YoY Change	-12.12%	-12.82%	-19.62%
Cost Of Revenue	$1.977B	$1.749B	$1.795B
YoY Change	-14.82%	-15.89%	-16.99%
Gross Profit	$573.4M	$376.8M	$230.3M
YoY Change	-1.34%	4.93%	-35.56%
Gross Profit Margin	22.49%	17.73%	11.37%
Selling, General & Admin	$22.40M	$9.900M	$4.100M
YoY Change	-8.57%	1.02%	-77.35%
% of Gross Profit	3.91%	2.63%	1.78%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$73.70M	$71.00M	$73.10M
YoY Change	12.69%	2.9%	0.14%
% of Gross Profit	12.85%	18.84%	31.74%
Operating Expenses	$2.327B	$1.877B	$1.985B
YoY Change	-3.48%	-13.02%	-12.0%
Operating Profit	$223.4M	$248.6M	$40.50M
YoY Change	-54.53%	-11.31%	-84.67%
Interest Expense	-$40.00M	$50.80M	$49.80M
YoY Change	3.36%	2.21%	-3.49%
% of Operating Profit	-17.91%	20.43%	122.96%
Other Income/Expense, Net	-$49.80M	-$56.00M	-$65.40M
YoY Change	-21.57%	17.65%	37.11%
Pretax Income	$173.6M	$192.6M	-$24.90M
YoY Change	-59.42%	-17.23%	-111.5%
Income Tax	$58.10M	-$86.30M	$19.00M
% Of Pretax Income	33.47%	-44.81%
Net Earnings	$117.0M	$279.7M	-$45.60M
YoY Change	-65.81%	68.9%	-126.9%
Net Earnings / Revenue	4.59%	13.16%	-2.25%
Basic Earnings Per Share	$0.29	$0.72	-$0.12
Diluted Earnings Per Share	$0.28	$0.71	-$0.12
COMMON SHARES
Basic Shares Outstanding	390.0M shares	389.6M shares	389.4M shares
Diluted Shares Outstanding		393.9M shares	389.4M shares

Balance Sheet

Concept	2020 Q4	2020 Q3	2020 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$2.509B	$1.628B	$1.085B
YoY Change	110.49%	212.48%	76.71%
Cash & Equivalents	$2.509B	$1.628B	$1.085B
Short-Term Investments
Other Short-Term Assets	$390.7M	$521.7M	$492.0M
YoY Change	-5.26%	18.51%	5.15%
Inventory
Prepaid Expenses
Receivables	$4.646B	$3.297B	$3.147B
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$9.368B	$7.284B	$6.214B
YoY Change	6.81%	3.32%	-16.87%
LONG-TERM ASSETS
Property, Plant & Equipment	$690.3M	$709.8M	$717.8M
YoY Change	-11.28%	-6.38%	-6.43%
Goodwill	$4.946B	$4.875B	$4.842B
YoY Change	1.04%	0.58%	-0.85%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$424.4M	$414.3M	$430.8M
YoY Change	-9.3%	-9.36%	-5.11%
Total Long-Term Assets	$8.675B	$8.790B	$8.683B
YoY Change	-3.41%	-1.76%	-4.08%
TOTAL ASSETS
Total Short-Term Assets	$9.368B	$7.284B	$6.214B
Total Long-Term Assets	$8.675B	$8.790B	$8.683B
Total Assets	$18.04B	$16.07B	$14.90B
YoY Change	1.64%	0.48%	-9.86%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$7.270B	$5.106B	$4.328B
YoY Change	0.89%	-9.73%	-28.13%
Accrued Expenses	$832.4M	$644.7M	$599.3M
YoY Change	12.06%	1.64%	-4.33%
Deferred Revenue	$657.8M	$611.3M	$557.6M
YoY Change	12.33%	8.69%	-4.72%
Short-Term Debt	$48.00M	$46.30M	$51.90M
YoY Change	-8.4%	-81.09%	-74.94%
Long-Term Debt Due	$502.5M	$506.6M	$503.0M
YoY Change	0.1%	15251.52%	167566.67%
Total Short-Term Liabilities	$9.581B	$7.228B	$6.367B
YoY Change	1.7%	-2.3%	-17.65%
LONG-TERM LIABILITIES
Long-Term Debt	$2.916B	$3.411B	$3.412B
YoY Change	5.19%	1.31%	-4.27%
Other Long-Term Liabilities	$655.2M	$662.6M	$749.2M
YoY Change	-8.33%	-7.25%	4.01%
Total Long-Term Liabilities	$3.571B	$4.074B	$4.161B
YoY Change	2.42%	-0.19%	-2.88%
TOTAL LIABILITIES
Total Short-Term Liabilities	$9.581B	$7.228B	$6.367B
Total Long-Term Liabilities	$3.571B	$4.074B	$4.161B
Total Liabilities	$15.01B	$13.16B	$12.25B
YoY Change	1.65%	-1.11%	-11.74%
SHAREHOLDERS EQUITY
Retained Earnings	$2.637B	$2.623B	$2.444B
YoY Change	-1.97%	6.84%	2.62%
Common Stock	$39.00M	$38.90M	$38.90M
YoY Change	0.78%	0.52%	0.78%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares	0.000 shares
Shareholders Equity	$2.895B	$2.723B	$2.450B
YoY Change
Total Liabilities & Shareholders Equity	$18.04B	$16.07B	$14.90B
YoY Change	1.64%	0.48%	-9.86%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2020 Q2
OPERATING ACTIVITIES
Net Income	$117.0M	$279.7M	-$45.60M
YoY Change	-65.81%	68.9%	-126.9%
Depreciation, Depletion And Amortization	$73.70M	$71.00M	$73.10M
YoY Change	12.69%	2.9%	0.14%
Cash From Operating Activities	$1.522B	$689.3M	-$87.10M
YoY Change	37.67%	206.9%	-129.78%
INVESTING ACTIVITIES
Capital Expenditures	-$55.50M	$40.10M	$27.30M
YoY Change	-14.22%	-25.33%	-42.28%
Acquisitions
YoY Change
Other Investing Activities	-$28.20M	$900.0K	-$5.200M
YoY Change	-218.99%	-91.74%	-5300.0%
Cash From Investing Activities	-$83.70M	-$39.20M	-$32.50M
YoY Change	104.15%	-8.41%	-31.14%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-608.5M	-115.4M	-366.7M
YoY Change	52.89%	-54.44%	31.72%
NET CHANGE
Cash From Operating Activities	1.522B	689.3M	-87.10M
Cash From Investing Activities	-83.70M	-39.20M	-32.50M
Cash From Financing Activities	-608.5M	-115.4M	-366.7M
Net Change In Cash	829.9M	534.7M	-486.3M
YoY Change	24.5%	-847.83%	1369.18%
FREE CASH FLOW
Cash From Operating Activities	$1.522B	$689.3M	-$87.10M
Capital Expenditures	-$55.50M	$40.10M	$27.30M
Free Cash Flow	$1.578B	$649.2M	-$114.4M
YoY Change	34.8%	279.87%	-146.66%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020Q4	us-gaap	Area Of Real Estate Property AreaOfRealEstateProperty	1700000	sqft
CY2020	us-gaap	Restructuring And Related Cost Number Of Positions Eliminated RestructuringAndRelatedCostNumberOfPositionsEliminated	1520	numberOfPeople
CY2020	dei	Local Phone Number LocalPhoneNumber	704-1200
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000051644
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Type DocumentType	10-K
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	390677929	shares
CY2020Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	98300000	USD
CY2019Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	40200000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1133900000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1116400000	USD
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.10
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.10
CY2020Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	800000000.0	shares
CY2019Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	800000000.0	shares
CY2020Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	390900000	shares
CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	387000000.0	shares
CY2020Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	390900000	shares
CY2019Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	387000000.0	shares
CY2020Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	0	shares
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	0	shares
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	1-6686
CY2020	dei	Entity Registrant Name EntityRegistrantName	INTERPUBLIC GROUP OF COMPANIES, INC.
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	DE
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	13-1024020
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	909 Third Avenue,
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	New York,
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	10022
CY2020	dei	City Area Code CityAreaCode	(212)
CY2020	dei	Security12b Title Security12bTitle	Common Stock, par value $0.10 per share
CY2020	dei	Trading Symbol TradingSymbol	IPG
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	6500000000	USD
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	390677929	shares
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8064500000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8625100000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8031600000	USD
CY2020	us-gaap	Recovery Of Direct Costs RecoveryOfDirectCosts	996500000	USD
CY2019	us-gaap	Recovery Of Direct Costs RecoveryOfDirectCosts	1596200000	USD
CY2018	us-gaap	Recovery Of Direct Costs RecoveryOfDirectCosts	1682800000	USD
CY2020	us-gaap	Revenues Revenues	9061000000.0	USD
CY2019	us-gaap	Revenues Revenues	10221300000	USD
CY2018	us-gaap	Revenues Revenues	9714400000	USD
CY2020	us-gaap	Labor And Related Expense LaborAndRelatedExpense	5345000000.0	USD
CY2019	us-gaap	Labor And Related Expense LaborAndRelatedExpense	5568800000	USD
CY2018	us-gaap	Labor And Related Expense LaborAndRelatedExpense	5298300000	USD
CY2020	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	1367900000	USD
CY2019	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	1564100000	USD
CY2018	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	1355100000	USD
CY2020	ipg	Recoveryof Direct Costs Expenses RecoveryofDirectCostsExpenses	996500000	USD
CY2019	ipg	Recoveryof Direct Costs Expenses RecoveryofDirectCostsExpenses	1596200000	USD
CY2018	ipg	Recoveryof Direct Costs Expenses RecoveryofDirectCostsExpenses	1682800000	USD
CY2020	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	7709400000	USD
CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	8729100000	USD
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	8336200000	USD
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	58800000	USD
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	93800000	USD
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	166500000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	290600000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	278500000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	202900000	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	413800000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	33900000	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	0.0	USD
CY2020	us-gaap	Operating Expenses OperatingExpenses	8472600000	USD
CY2019	us-gaap	Operating Expenses OperatingExpenses	9135300000	USD
CY2018	us-gaap	Operating Expenses OperatingExpenses	8705600000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	588400000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	1086000000.0	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	1008800000	USD
CY2020	us-gaap	Interest Expense InterestExpense	192200000	USD
CY2019	us-gaap	Interest Expense InterestExpense	199300000	USD
CY2018	us-gaap	Interest Expense InterestExpense	123000000.0	USD
CY2020	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	29500000	USD
CY2019	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	34500000	USD
CY2018	us-gaap	Interest Income Deposits With Financial Institutions InterestIncomeDepositsWithFinancialInstitutions	21800000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-64400000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-42900000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-69600000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-227100000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-207700000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-207700000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-170800000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-170800000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	361300000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	878300000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	838000000.0	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8000000.0	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	204800000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	199200000	USD
CY2020	ipg	Income Lossfrom Continuing Operationsbefore Equity Method Investmentsand Noncontrolling Interest IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsandNoncontrollingInterest	353300000	USD
CY2019	ipg	Income Lossfrom Continuing Operationsbefore Equity Method Investmentsand Noncontrolling Interest IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsandNoncontrollingInterest	673500000	USD
CY2018	ipg	Income Lossfrom Continuing Operationsbefore Equity Method Investmentsand Noncontrolling Interest IncomeLossfromContinuingOperationsbeforeEquityMethodInvestmentsandNoncontrollingInterest	638800000	USD
CY2020	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	900000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	400000	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	-1100000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	354200000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	354200000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	673900000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	673900000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	637700000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	637700000	USD
CY2020	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	3100000	USD
CY2019	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	17900000	USD
CY2018	us-gaap	Net Income Loss Attributable To Nonredeemable Noncontrolling Interest NetIncomeLossAttributableToNonredeemableNoncontrollingInterest	18800000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	351100000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	351100000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	656000000.0	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	656000000.0	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	618900000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	618900000	USD
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.90
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.70
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.61
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.89
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.68
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.59
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	389400000	shares
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	-6700000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	386100000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	383300000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	393200000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	391200000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	389000000.0	shares
CY2020	us-gaap	Profit Loss ProfitLoss	354200000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	354200000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	673900000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	673900000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	637700000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	637700000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	39400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	11300000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentBeforeTax	-149600000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	-20000000.0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Reclassification Adjustment From Aoci Realized Upon Sale Or Liquidation Before Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationReclassificationAdjustmentFromAOCIRealizedUponSaleOrLiquidationBeforeTax	-15700000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	59400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	18000000.0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-133900000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	11300000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	0.0	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	0.0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-2400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-2300000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-2200000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	3400000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	500000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	700000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	10300000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1800000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	1500000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-29200000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	-14800000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Net Unamortized Gain Loss Arising During Period Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansNetUnamortizedGainLossArisingDuringPeriodBeforeTax	12600000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	7400000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	6700000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	7500000	USD
CY2020	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	-100000	USD
CY2019	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	0.0	USD
CY2018	us-gaap	Defined Benefit Plan Recognized Net Gain Loss Due To Settlements And Curtailments1 DefinedBenefitPlanRecognizedNetGainLossDueToSettlementsAndCurtailments1	-1000000.0	USD
CY2020	ipg	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Other Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansOtherBeforeTax	-3300000	USD
CY2019	ipg	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Other Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansOtherBeforeTax	-2500000	USD
CY2018	ipg	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Other Before Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansOtherBeforeTax	-1000000.0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	4600000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	1200000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-1800000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	20600000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	9400000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-16300000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	49100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	10400000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-116100000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	403300000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	684300000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	521600000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	2400000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	17200000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	16000000.0	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	400900000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	667100000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	505600000	USD
CY2020Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	2509000000.0	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1192200000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	4646400000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	5209200000	USD
CY2020Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	1820700000	USD
CY2019Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	1934100000	USD
CY2020Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	800000	USD
CY2019Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	22800000	USD
CY2020Q4	us-gaap	Other Assets Current OtherAssetsCurrent	390700000	USD
CY2019Q4	us-gaap	Other Assets Current OtherAssetsCurrent	412400000	USD
CY2020Q4	us-gaap	Assets Current AssetsCurrent	9367600000	USD
CY2019Q4	us-gaap	Assets Current AssetsCurrent	8770700000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	690300000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	778100000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	302000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net Noncurrent DeferredTaxAssetsNetNoncurrent	252100000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	4945500000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	4894400000	USD
CY2020Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	933600000	USD
CY2019Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	1014300000	USD
CY2020Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1379300000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1574400000	USD
CY2020Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	424400000	USD
CY2019Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	467900000	USD
CY2020Q4	us-gaap	Assets Assets	18042700000	USD
CY2020Q4	us-gaap	Assets Assets	18042700000	USD
CY2019Q4	us-gaap	Assets Assets	17751900000	USD
CY2019Q4	us-gaap	Assets Assets	17751900000	USD
CY2020Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	7269700000	USD
CY2019Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	7205400000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	832400000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	742800000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	657800000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	585600000	USD
CY2020Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	48000000.0	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	52400000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	502500000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	502000000.0	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	268500000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	267200000	USD
CY2020Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	1600000	USD
CY2019Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	65000000.0	USD
CY2020Q4	us-gaap	Liabilities Current LiabilitiesCurrent	9580500000	USD
CY2019Q4	us-gaap	Liabilities Current LiabilitiesCurrent	9420400000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2915800000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2771900000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	1441000000.0	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	1429600000	USD
CY2020Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	413200000	USD
CY2019Q4	us-gaap	Deferred Compensation Liability Classified Noncurrent DeferredCompensationLiabilityClassifiedNoncurrent	425000000.0	USD
CY2020Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	655200000	USD
CY2019Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	714700000	USD
CY2020Q4	us-gaap	Liabilities Liabilities	15005700000	USD
CY2019Q4	us-gaap	Liabilities Liabilities	14761600000	USD
CY2020Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	93100000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	164700000	USD
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	39000000.0	USD
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	38700000	USD
CY2020Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	1099300000	USD
CY2019Q4	us-gaap	Additional Paid In Capital AdditionalPaidInCapital	977300000	USD
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2636900000	USD
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2689900000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-880200000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-930000000.0	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	2895000000.0	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	2775900000	USD
CY2020Q4	us-gaap	Minority Interest MinorityInterest	48900000	USD
CY2019Q4	us-gaap	Minority Interest MinorityInterest	49700000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2943900000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2825600000	USD
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	18042700000	USD
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	17751900000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	354200000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	354200000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	673900000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	673900000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	637700000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	637700000	USD
CY2020	us-gaap	Depreciation And Amortization DepreciationAndAmortization	290600000	USD
CY2019	us-gaap	Depreciation And Amortization DepreciationAndAmortization	278500000	USD
CY2018	us-gaap	Depreciation And Amortization DepreciationAndAmortization	202900000	USD
CY2020	us-gaap	Restructuring Costs RestructuringCosts	265600000	USD
CY2019	us-gaap	Restructuring Costs RestructuringCosts	11700000	USD
CY2018	us-gaap	Restructuring Costs RestructuringCosts	0.0	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	67000000.0	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	80200000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	82200000	USD
CY2020	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	-67000000.0	USD
CY2019	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	-43400000	USD
CY2018	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	-61900000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	59500000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	10100000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	6500000	USD
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	11400000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	9300000	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	6500000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-46400000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	9700000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	14100000	USD
CY2020	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-20000000.0	USD
CY2019	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-6800000	USD
CY2018	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	-1200000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-551400000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	111200000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	603800000	USD
CY2020	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	-122500000	USD
CY2019	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	38700000	USD
CY2018	us-gaap	Increase Decrease In Unbilled Receivables IncreaseDecreaseInUnbilledReceivables	209500000	USD
CY2020	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	-11900000	USD
CY2019	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	27200000	USD
CY2018	us-gaap	Increase Decrease In Prepaid Deferred Expense And Other Assets IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	67200000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-27000000.0	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	546000000.0	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	428700000	USD
CY2020	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	179300000	USD
CY2019	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	27400000	USD
CY2018	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-24200000	USD
CY2020	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	62000000.0	USD
CY2019	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	46500000	USD
CY2018	us-gaap	Increase Decrease In Contract With Customer Liability IncreaseDecreaseInContractWithCustomerLiability	44900000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	141800000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	37200000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	16800000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1847200000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1529200000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	565100000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	167500000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	198500000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	177100000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	4900000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	600000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	2309800000	USD
CY2020	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	43800000	USD
CY2019	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	-37400000	USD
CY2018	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	4600000	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-216200000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-161700000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-2491500000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	503700000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	403300000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	104800000	USD
CY2020	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	398100000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	363100000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	322100000	USD
CY2020	us-gaap	Payments For Previous Acquisition PaymentsForPreviousAcquisition	46600000	USD
CY2019	us-gaap	Payments For Previous Acquisition PaymentsForPreviousAcquisition	15800000	USD
CY2018	us-gaap	Payments For Previous Acquisition PaymentsForPreviousAcquisition	33700000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	22300000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	22400000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	29200000	USD
CY2020	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	19500000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	21600000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	16900000	USD
CY2020	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	646200000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2494200000	USD
CY2020	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	6500000	USD
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	4300000	USD
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	15500000	USD
CY2020	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	1500000	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-19800000	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-17500000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	0	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	117100000	USD
CY2020	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-10200000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-1300000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-15200000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-346200000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-843000000.0	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1853200000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	31000000.0	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-6000000.0	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-47300000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	1315800000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	518500000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-120500000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1195700000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	677200000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	797700000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	2511500000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	1195700000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	677200000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2246300000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	637700000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-116100000	USD
CY2018	ipg	Changes In Temporary Equity ChangesInTemporaryEquity	2400000	USD
CY2018	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	16900000	USD
CY2018	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	42900000	USD
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	117100000	USD
CY2018	us-gaap	Treasury Stock Retired Cost Method Amount TreasuryStockRetiredCostMethodAmount	-0.0	USD
CY2018	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	322100000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	87500000	USD
CY2018	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	15700000	USD
CY2018	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	29200000	USD
CY2018	us-gaap	Stockholders Equity Other StockholdersEquityOther	-1700000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2432800000	USD
CY2019	us-gaap	Profit Loss ProfitLoss	673900000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	10400000	USD
CY2019	ipg	Changes In Temporary Equity ChangesInTemporaryEquity	24600000	USD
CY2019	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	21600000	USD
CY2019	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	-200000	USD
CY2019	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	363100000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	89100000	USD
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	4300000	USD
CY2019	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	22400000	USD
CY2019	us-gaap	Stockholders Equity Other StockholdersEquityOther	3400000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2825600000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2825600000	USD
CY2020	us-gaap	Profit Loss ProfitLoss	354200000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	49100000	USD
CY2020	ipg	Changes In Temporary Equity ChangesInTemporaryEquity	23300000	USD
CY2020	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	19500000	USD
CY2020	us-gaap	Minority Interest Change In Redemption Value MinorityInterestChangeInRedemptionValue	46200000	USD
CY2020	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	402500000	USD
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	81200000	USD
CY2020	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	7200000	USD
CY2020	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	22400000	USD
CY2020	us-gaap	Stockholders Equity Other StockholdersEquityOther	8100000	USD
CY2020Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	2943900000	USD
CY2020	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="margin-top:9pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Reclassifications</span></div><div style="margin-top:5pt;text-align:justify;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Certain reclassifications and immaterial changes have been made to prior-period financial statements to conform to the current-period presentation. Segment information for the prior period has been recast to conform to the current-period presentation.</span></div>
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-top:9pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:700;line-height:120%">Use of Estimates</span></div><div style="margin-top:5pt;text-align:justify;text-indent:18pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of financial statements in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) requires us to make judgments, assumptions and estimates that affect the amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the reporting date and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates and assumptions.</span></div>
CY2020	ipg	Leasehold Improvements Useful Life LeaseholdImprovementsUsefulLife	the shorter of the useful life or the remaining lease term
CY2020	ipg	Capitalized Internal Use Software Useful Life CapitalizedInternalUseSoftwareUsefulLife	10
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1421100000	USD
CY2019Q1	us-gaap	Operating Lease Liability OperatingLeaseLiability	1544400000	USD
CY2020Q4	ipg	Number Of Reporting Units For Purposes Of Annual Goodwill Impairment Test NumberOfReportingUnitsForPurposesOfAnnualGoodwillImpairmentTest	12
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	1200000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-5300000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	5600000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8064500000	USD
CY2020	us-gaap	Revenues Revenues	9061000000.0	USD
CY2019	us-gaap	Revenues Revenues	10221300000	USD
CY2018	us-gaap	Revenues Revenues	9714400000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8625100000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8031600000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	4646400000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	5209200000	USD
CY2020Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	1820700000	USD
CY2019Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	1934100000	USD
CY2020Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	51800000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Net ContractWithCustomerAssetNet	63000000.0	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	657800000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	585600000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	212200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	194700000	USD
CY2020Q4	us-gaap	Revenue Remaining Performance Obligation RevenueRemainingPerformanceObligation	654000000.0	USD
CY2020	ipg	Minimum Remaining Lease Term MinimumRemainingLeaseTerm	P1Y
CY2020	ipg	Maximum Remaining Lease Term MaximumRemainingLeaseTerm	P19Y
CY2020	us-gaap	Operating Lease Expense OperatingLeaseExpense	318500000	USD
CY2019	us-gaap	Operating Lease Expense OperatingLeaseExpense	325200000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	10600000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	13800000	USD
CY2020	us-gaap	Sublease Income SubleaseIncome	15800000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	12900000	USD
CY2020	us-gaap	Lease Cost LeaseCost	313300000	USD
CY2019	us-gaap	Lease Cost LeaseCost	326100000	USD
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	335700000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	334100000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	274400000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	422800000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0400
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0426
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	322900000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	302600000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	241200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	735200000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	2008800000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	299300000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	1709500000	USD
CY2020Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	268500000	USD
CY2020Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	1441000000.0	USD
CY2020Q4	ipg	Operating Lease Liability Leases Not Commenced OperatingLeaseLiabilityLeasesNotCommenced	52000000.0	USD
CY2020	ipg	Minimum Lease Termfor Leases That Have Not Yet Commenced MinimumLeaseTermforLeasesThatHaveNotYetCommenced	P1Y
CY2020	ipg	Maximum Lease Termfor Leases That Have Not Yet Commenced MaximumLeaseTermforLeasesThatHaveNotYetCommenced	P10Y
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	3418300000	USD
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	3273900000	USD
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	502500000	USD
CY2019Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	502000000.0	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2915800000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2771900000	USD
CY2020Q4	us-gaap	Debt Instrument Fee Amount DebtInstrumentFeeAmount	2000000.0	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	502500000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	250200000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	498900000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	498300000	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	0.0	USD
CY2020Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	1668400000	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	3418300000	USD
CY2020Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	24300000	USD
CY2019Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	21600000	USD
CY2020Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	3995000000.0	USD
CY2019Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	3565500000	USD
CY2020Q4	ipg	Margin For Base Rate Advances MarginForBaseRateAdvances	0.00125
CY2020Q4	ipg	Margin For Eurocurrency Rate Advances MarginForEurocurrencyRateAdvances	0.01125
CY2020	ipg	Annual Rate For Fronting Fees Accrued On Letters Of Credit AnnualRateForFrontingFeesAccruedOnLettersOfCredit	0.00250
CY2020	us-gaap	Line Of Credit Facility Commitment Fee Percentage LineOfCreditFacilityCommitmentFeePercentage	0.00125
CY2020Q4	us-gaap	Debt Instrument Fee Amount DebtInstrumentFeeAmount	2000000.0	USD
CY2020	ipg	Leverage Ratio Maximum LeverageRatioMaximum	4.25x
CY2020Q4	ipg	Commercialpaperborrowingcapacity Commercialpaperborrowingcapacity	1500000000.0	USD
CY2020	us-gaap	Debt Instrument Term DebtInstrumentTerm	P397D
CY2020Q4	us-gaap	Commercial Paper CommercialPaper	0	USD
CY2020	ipg	Averageamountborrowedundercommercialpaperduringtheperiod Averageamountborrowedundercommercialpaperduringtheperiod	105800000	USD
CY2019	ipg	Averageamountborrowedundercommercialpaperduringtheperiod Averageamountborrowedundercommercialpaperduringtheperiod	312900000	USD
CY2020	ipg	Commercialpaperweightedaverageinterestrateovertime Commercialpaperweightedaverageinterestrateovertime	0.015
CY2019	ipg	Commercialpaperweightedaverageinterestrateovertime Commercialpaperweightedaverageinterestrateovertime	0.025
CY2020	ipg	Commercialpaperweightedaveragematuritydaysoutstanding Commercialpaperweightedaveragematuritydaysoutstanding	twelve
CY2019	ipg	Commercialpaperweightedaveragematuritydaysoutstanding Commercialpaperweightedaveragematuritydaysoutstanding	thirteen days
CY2020Q4	ipg	Cash Debt Pooling Arrangements Amount Netted CashDebtPoolingArrangementsAmountNetted	2702200000	USD
CY2019Q4	ipg	Cash Debt Pooling Arrangements Amount Netted CashDebtPoolingArrangementsAmountNetted	2274900000	USD
CY2018Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	8300000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	351100000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	351100000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	656000000.0	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	656000000.0	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	618900000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	618900000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	389400000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	386100000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	383300000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	3800000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	5100000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	5700000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	393200000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	391200000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	389000000.0	shares
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.90
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.70
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.61
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.89
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.68
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.59
CY2018Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets	2327900000	USD
CY2018Q4	us-gaap	Loans Payable LoansPayable	500000000.0	USD
CY2018Q4	ipg	Debt Issuance Face Amount DebtIssuanceFaceAmount	2000000000.0	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	13300000	USD
CY2018Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	112900000	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	28200000	USD
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	159700000	USD
CY2018Q4	us-gaap	Deferred Income Taxes And Other Tax Liabilities Noncurrent DeferredIncomeTaxesAndOtherTaxLiabilitiesNoncurrent	600000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	1110800000	USD
CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	995000000.0	USD
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	8300000	USD
CY2018Q4	us-gaap	Accounts Payable Current And Noncurrent AccountsPayableCurrentAndNoncurrent	37100000	USD
CY2018Q4	us-gaap	Accrued Liabilities Current And Noncurrent AccruedLiabilitiesCurrentAndNoncurrent	46900000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	23200000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	800000	USD
CY2018Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Assets BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets	2327900000	USD
CY2018	ipg	Selling General And Administrative Expense Acquiree SellingGeneralAndAdministrativeExpenseAcquiree	35000000.0	USD
CY2018	ipg	Interest Expense Acquiree InterestExpenseAcquiree	3700000	USD
CY2018	ipg	Interest Income Deposits With Financial Institutions Acquiree InterestIncomeDepositsWithFinancialInstitutionsAcquiree	400000	USD
CY2018	ipg	Other Nonoperating Income Expense Acquiree OtherNonoperatingIncomeExpenseAcquiree	10300000	USD
CY2018	us-gaap	Business Acquisitions Pro Forma Revenue BusinessAcquisitionsProFormaRevenue	10230400000	USD
CY2018	us-gaap	Business Acquisitions Pro Forma Net Income Loss BusinessAcquisitionsProFormaNetIncomeLoss	642200000	USD
CY2020	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	4
CY2020Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	28000000.0	USD
CY2019	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	1
CY2019Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	7600000	USD
CY2018	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	5
CY2018Q4	us-gaap	Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Net BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet	2131000000.0	USD
CY2020	ipg	Paymentsto Acquire Businesses Gross Current Year Acquisitions PaymentstoAcquireBusinessesGrossCurrentYearAcquisitions	8500000	USD
CY2019	ipg	Paymentsto Acquire Businesses Gross Current Year Acquisitions PaymentstoAcquireBusinessesGrossCurrentYearAcquisitions	600000	USD
CY2018	ipg	Paymentsto Acquire Businesses Gross Current Year Acquisitions PaymentstoAcquireBusinessesGrossCurrentYearAcquisitions	2323400000	USD
CY2020	ipg	Paymentto Acquire Businesses Gross Prior Year Acquisitions PaymenttoAcquireBusinessesGrossPriorYearAcquisitions	45900000	USD
CY2019	ipg	Paymentto Acquire Businesses Gross Prior Year Acquisitions PaymenttoAcquireBusinessesGrossPriorYearAcquisitions	15800000	USD
CY2018	ipg	Paymentto Acquire Businesses Gross Prior Year Acquisitions PaymenttoAcquireBusinessesGrossPriorYearAcquisitions	33900000	USD
CY2020	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	2900000	USD
CY2019	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	0	USD
CY2018	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	13800000	USD
CY2020	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	51500000	USD
CY2019	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	16400000	USD
CY2018	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	2343500000	USD
CY2020	us-gaap	Business Combination Separately Recognized Transactions Expenses And Losses Recognized BusinessCombinationSeparatelyRecognizedTransactionsExpensesAndLossesRecognized	2900000	USD
CY2019	us-gaap	Business Combination Separately Recognized Transactions Expenses And Losses Recognized BusinessCombinationSeparatelyRecognizedTransactionsExpensesAndLossesRecognized	9300000	USD
CY2018	us-gaap	Business Combination Separately Recognized Transactions Expenses And Losses Recognized BusinessCombinationSeparatelyRecognizedTransactionsExpensesAndLossesRecognized	19400000	USD
CY2020	ipg	Total Cash Paymentsto Acquire Businessesincluding Operating Expenses TotalCashPaymentstoAcquireBusinessesincludingOperatingExpenses	54400000	USD
CY2019	ipg	Total Cash Paymentsto Acquire Businessesincluding Operating Expenses TotalCashPaymentstoAcquireBusinessesincludingOperatingExpenses	25700000	USD
CY2018	ipg	Total Cash Paymentsto Acquire Businessesincluding Operating Expenses TotalCashPaymentstoAcquireBusinessesincludingOperatingExpenses	2362900000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	4900000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	600000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	2309800000	USD
CY2020	us-gaap	Payments For Previous Acquisition PaymentsForPreviousAcquisition	46600000	USD
CY2020	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	8600000	USD
CY2019	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	-300000	USD
CY2018	us-gaap	Allowance For Doubtful Accounts Receivable Period Increase Decrease AllowanceForDoubtfulAccountsReceivablePeriodIncreaseDecrease	2200000	USD
CY2020	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	11200000	USD
CY2019	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	11900000	USD
CY2018	us-gaap	Allowance For Doubtful Accounts Receivable Write Offs AllowanceForDoubtfulAccountsReceivableWriteOffs	7100000	USD
CY2019	us-gaap	Payments For Previous Acquisition PaymentsForPreviousAcquisition	15800000	USD
CY2018	us-gaap	Payments For Previous Acquisition PaymentsForPreviousAcquisition	33700000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	164700000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	167900000	USD
CY2017Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	252100000	USD
CY2020	ipg	Noncontrolling Interest Related To Redeemable Noncontrolling Interests NoncontrollingInterestRelatedToRedeemableNoncontrollingInterests	5400000	USD
CY2019	ipg	Noncontrolling Interest Related To Redeemable Noncontrolling Interests NoncontrollingInterestRelatedToRedeemableNoncontrollingInterests	2800000	USD
CY2018	ipg	Noncontrolling Interest Related To Redeemable Noncontrolling Interests NoncontrollingInterestRelatedToRedeemableNoncontrollingInterests	10700000	USD
CY2020	ipg	Redeemable Noncontrolling Interests Period Increase RedeemableNoncontrollingInterestsPeriodIncrease	0.0	USD
CY2019	ipg	Redeemable Noncontrolling Interests Period Increase RedeemableNoncontrollingInterestsPeriodIncrease	24300000	USD
CY2018	ipg	Redeemable Noncontrolling Interests Period Increase RedeemableNoncontrollingInterestsPeriodIncrease	0.0	USD
CY2020	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	20600000	USD
CY2019	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	24900000	USD
CY2018	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	33700000	USD
CY2020	ipg	Redeemable Noncontrolling Interests Redemption Value Adjustments RedeemableNoncontrollingInterestsRedemptionValueAdjustments	-45600000	USD
CY2019	ipg	Redeemable Noncontrolling Interests Redemption Value Adjustments RedeemableNoncontrollingInterestsRedemptionValueAdjustments	200000	USD
CY2018	ipg	Redeemable Noncontrolling Interests Redemption Value Adjustments RedeemableNoncontrollingInterestsRedemptionValueAdjustments	-39800000	USD
CY2020Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	93100000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	164700000	USD
CY2018Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	167900000	USD
CY2019Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	40200000	USD
CY2018Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	42500000	USD
CY2017Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	42700000	USD
CY2020	us-gaap	New Accounting Pronouncement Or Change In Accounting Principle Description NewAccountingPronouncementOrChangeInAccountingPrincipleDescription	9.0
CY2020	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	50500000	USD
CY2019	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	10100000	USD
CY2018	us-gaap	Valuation Allowances And Reserves Charged To Cost And Expense ValuationAllowancesAndReservesChargedToCostAndExpense	6500000	USD
CY2020	us-gaap	Allowance For Doubtful Accounts Receivable Recoveries AllowanceForDoubtfulAccountsReceivableRecoveries	200000	USD
CY2020	ipg	Allowance For Doubtful Accounts Foreign Currency Translation Adjustment AllowanceForDoubtfulAccountsForeignCurrencyTranslationAdjustment	1000000.0	USD
CY2019	ipg	Allowance For Doubtful Accounts Foreign Currency Translation Adjustment AllowanceForDoubtfulAccountsForeignCurrencyTranslationAdjustment	-200000	USD
CY2018	ipg	Allowance For Doubtful Accounts Foreign Currency Translation Adjustment AllowanceForDoubtfulAccountsForeignCurrencyTranslationAdjustment	-1800000	USD
CY2020Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	98300000	USD
CY2019Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	40200000	USD
CY2018Q4	us-gaap	Valuation Allowances And Reserves Balance ValuationAllowancesAndReservesBalance	42500000	USD
CY2020Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	654600000	USD
CY2019Q4	us-gaap	Furniture And Fixtures Gross FurnitureAndFixturesGross	694300000	USD
CY2020Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	554600000	USD
CY2019Q4	us-gaap	Leasehold Improvements Gross LeaseholdImprovementsGross	634900000	USD
CY2020Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	470100000	USD
CY2019Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	422000000.0	USD
CY2020Q4	us-gaap	Land Land	144900000	USD
CY2019Q4	us-gaap	Land Land	143300000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1824200000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1894500000	USD
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1133900000	USD
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1116400000	USD
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	690300000	USD
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	778100000	USD
CY2020	us-gaap	Depreciation Depreciation	204700000	USD
CY2019	us-gaap	Depreciation Depreciation	192500000	USD
CY2018	us-gaap	Depreciation Depreciation	165300000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	504600000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	494100000	USD
CY2020Q4	us-gaap	Restructuring Reserve Current RestructuringReserveCurrent	69500000	USD
CY2019Q4	us-gaap	Restructuring Reserve Current RestructuringReserveCurrent	1600000	USD
CY2020Q4	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	50600000	USD
CY2019Q4	us-gaap	Accrued Income Taxes AccruedIncomeTaxes	43200000	USD
CY2020Q4	ipg	Acquisition Obligationscurrent AcquisitionObligationscurrent	47900000	USD
CY2019Q4	ipg	Acquisition Obligationscurrent AcquisitionObligationscurrent	45700000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	43600000	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	38800000	USD
CY2020Q4	ipg	Office And Related Expenses Current OfficeAndRelatedExpensesCurrent	25500000	USD
CY2019Q4	ipg	Office And Related Expenses Current OfficeAndRelatedExpensesCurrent	26900000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	90700000	USD
CY2018	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	30800000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	92500000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	832400000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	742800000	USD
CY2020	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	-67000000.0	USD
CY2019	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	-43400000	USD
CY2018	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	-61900000	USD
CY2020	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	2600000	USD
CY2019	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	500000	USD
CY2018	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	-7700000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-64400000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-42900000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-69600000	USD
CY2020	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	62900000	USD
CY2019	us-gaap	Proceeds From Divestiture Of Businesses Net Of Cash Divested ProceedsFromDivestitureOfBusinessesNetOfCashDivested	6700000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	182200000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	192700000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	88700000	USD
CY2020	ipg	Changeinoperatingleaserightofuseassetandleaseliabilities Changeinoperatingleaserightofuseassetandleaseliabilities	192600000	USD
CY2019	ipg	Changeinoperatingleaserightofuseassetandleaseliabilities Changeinoperatingleaserightofuseassetandleaseliabilities	9400000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	89100000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	150200000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	207900000	USD
CY2020	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	209900000	USD
CY2020	ipg	Net Cash Activities For Operating Lease Right Of Use Asset And Lease Liabilities Included In Other Non Current Assets And Liabilities Under Operating Activities NetCashActivitiesForOperatingLeaseRightOfUseAssetAndLeaseLiabilitiesIncludedInOtherNonCurrentAssetsAndLiabilitiesUnderOperatingActivities	17300000	USD
CY2019	us-gaap	Operating Lease Impairment Loss OperatingLeaseImpairmentLoss	8700000	USD
CY2019	ipg	Net Cash Activities For Operating Lease Right Of Use Asset And Lease Liabilities Included In Other Non Current Assets And Liabilities Under Operating Activities NetCashActivitiesForOperatingLeaseRightOfUseAssetAndLeaseLiabilitiesIncludedInOtherNonCurrentAssetsAndLiabilitiesUnderOperatingActivities	700000	USD
CY2020	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	124200000	USD
CY2019	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	92600000	USD
CY2018	us-gaap	Proceeds From Income Tax Refunds ProceedsFromIncomeTaxRefunds	24300000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	4875900000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	2800000	USD
CY2019	us-gaap	Goodwill Other Increase Decrease GoodwillOtherIncreaseDecrease	15700000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	4894400000	USD
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	24000000.0	USD
CY2020	us-gaap	Goodwill Other Increase Decrease GoodwillOtherIncreaseDecrease	27100000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	4945500000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	85900000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	86000000.0	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	37600000	USD
CY2020	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	4000000.0	USD
CY2019	us-gaap	Finitelived Intangible Assets Acquired1 FinitelivedIntangibleAssetsAcquired1	5000000.0	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1333900000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	400300000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	933600000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1336900000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	322600000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	1014300000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	88300000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	83800000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	79000000.0	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	77300000	USD
CY2020	us-gaap	Income Tax Reconciliation Disposition Of Business IncomeTaxReconciliationDispositionOfBusiness	8600000	USD
CY2019	us-gaap	Income Tax Reconciliation Disposition Of Business IncomeTaxReconciliationDispositionOfBusiness	9600000	USD
CY2018	us-gaap	Income Tax Reconciliation Disposition Of Business IncomeTaxReconciliationDispositionOfBusiness	11700000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	1700000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	-400000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	48100000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	-30800000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	-14100000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	-8400000	USD
CY2020	ipg	Netimpactofthe Tax Act NetimpactoftheTaxAct	0.0	USD
CY2019	ipg	Netimpactofthe Tax Act NetimpactoftheTaxAct	0.0	USD
CY2018	ipg	Netimpactofthe Tax Act NetimpactoftheTaxAct	13400000	USD
CY2020	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	-136200000	USD
CY2019	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	0.0	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	74500000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	279900000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	557400000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	474000000.0	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	81400000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	320900000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	364000000.0	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	361300000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	878300000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	838000000.0	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-52600000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	92200000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	38100000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-12000000.0	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	9500000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	29900000	USD
CY2020	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	-64600000	USD
CY2019	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	101700000	USD
CY2018	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	68000000.0	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-3700000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	10700000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	25100000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	500000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	8700000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	3400000	USD
CY2020	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	-3200000	USD
CY2018	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	0.0	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-3800000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-4300000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-2300000	USD
CY2019	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	19400000	USD
CY2018	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	28500000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	110700000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	92200000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	121900000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-34900000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-8500000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-19200000	USD
CY2020	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	75800000	USD
CY2019	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	83700000	USD
CY2018	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	102700000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8000000.0	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	204800000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	199200000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	8000000.0	USD
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.022
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.233
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.238
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.022
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.233
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.238
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	204800000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	199200000	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	75900000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	184500000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	176000000.0	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	9400000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	14000000.0	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	23800000	USD
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	49900000	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	34200000	USD
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	50700000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-23600000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-21400000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Reconciling Items IncomeTaxReconciliationOtherReconcilingItems	-17500000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-1300000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-26300000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-16900000	USD
CY2018	ipg	Netimpactofthe Tax Act NetimpactoftheTaxAct	13400000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	16600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	16700000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	106500000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	99500000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	27900000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	23700000	USD
CY2020Q4	ipg	Deferred Tax Assets Interest DeferredTaxAssetsInterest	42900000	USD
CY2019Q4	ipg	Deferred Tax Assets Interest DeferredTaxAssetsInterest	45500000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	23900000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsReserves	19400000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	19700000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	6500000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	350400000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	361400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	164200000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	343000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	297100000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	83600000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	44800000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	1014500000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	914600000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	197100000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	164200000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	817400000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	750400000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	86300000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	75300000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	340000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	321000000.0	USD
CY2020Q4	ipg	Deferred Tax Liabilities Rou DeferredTaxLiabilitiesROU	285800000	USD
CY2019Q4	ipg	Deferred Tax Liabilities Rou DeferredTaxLiabilitiesROU	335200000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	7300000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	6700000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	11600000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Tax Deferred Income DeferredTaxLiabilitiesTaxDeferredIncome	21700000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	9300000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	1300000	USD
CY2020Q4	us-gaap	Deferred Tax And Other Liabilities Noncurrent DeferredTaxAndOtherLiabilitiesNoncurrent	740300000	USD
CY2019Q4	us-gaap	Deferred Tax And Other Liabilities Noncurrent DeferredTaxAndOtherLiabilitiesNoncurrent	761200000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	77100000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	-10800000	USD
CY2020Q4	ipg	Deferred Tax Assets DeferredTaxAssets	302000000.0	USD
CY2019Q4	ipg	Deferred Tax Assets DeferredTaxAssets	252100000	USD
CY2020Q4	ipg	Deferred Tax Liabilities By Jurisdiction DeferredTaxLiabilitiesByJurisdiction	224900000	USD
CY2019Q4	ipg	Deferred Tax Liabilities By Jurisdiction DeferredTaxLiabilitiesByJurisdiction	262800000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	164200000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	211000000.0	USD
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	243000000.0	USD
CY2020	ipg	Valuation Allowance Deferred Tax Asset Change In Amount Charged Reversed To Costs And Expenses ValuationAllowanceDeferredTaxAssetChangeInAmountChargedReversedToCostsAndExpenses	17300000	USD
CY2019	ipg	Valuation Allowance Deferred Tax Asset Change In Amount Charged Reversed To Costs And Expenses ValuationAllowanceDeferredTaxAssetChangeInAmountChargedReversedToCostsAndExpenses	-24900000	USD
CY2018	ipg	Valuation Allowance Deferred Tax Asset Change In Amount Charged Reversed To Costs And Expenses ValuationAllowanceDeferredTaxAssetChangeInAmountChargedReversedToCostsAndExpenses	-28000000.0	USD
CY2020	ipg	Valuation Allowance Deferred Tax Asset Change In Amount Charged Reversed To Gross Tax Assets And Other Accounts ValuationAllowanceDeferredTaxAssetChangeInAmountChargedReversedToGrossTaxAssetsAndOtherAccounts	9900000	USD
CY2019	ipg	Valuation Allowance Deferred Tax Asset Change In Amount Charged Reversed To Gross Tax Assets And Other Accounts ValuationAllowanceDeferredTaxAssetChangeInAmountChargedReversedToGrossTaxAssetsAndOtherAccounts	-19800000	USD
CY2018	ipg	Valuation Allowance Deferred Tax Asset Change In Amount Charged Reversed To Gross Tax Assets And Other Accounts ValuationAllowanceDeferredTaxAssetChangeInAmountChargedReversedToGrossTaxAssetsAndOtherAccounts	5100000	USD
CY2020	ipg	Valuation Allowance Deferred Tax Asset Changein Amount Charged Reversedto Foreigncurrencytranslation ValuationAllowanceDeferredTaxAssetChangeinAmountChargedReversedtoForeigncurrencytranslation	5700000	USD
CY2019	ipg	Valuation Allowance Deferred Tax Asset Changein Amount Charged Reversedto Foreigncurrencytranslation ValuationAllowanceDeferredTaxAssetChangeinAmountChargedReversedtoForeigncurrencytranslation	-2100000	USD
CY2018	ipg	Valuation Allowance Deferred Tax Asset Changein Amount Charged Reversedto Foreigncurrencytranslation ValuationAllowanceDeferredTaxAssetChangeinAmountChargedReversedtoForeigncurrencytranslation	-9100000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	197100000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	211000000.0	USD
CY2019Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	1188800000	USD
CY2020Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	1080200000	USD
CY2019Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	1199700000	USD
CY2018Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	435000000.0	USD
CY2019	us-gaap	Other Tax Expense Benefit OtherTaxExpenseBenefit	10800000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	345300000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	335400000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	271900000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	18100000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	22700000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	65900000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	165700000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	25800000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	10800000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	6200000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	8100000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	6500000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	700000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	600000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	1700000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	26800000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	21700000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	16600000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	217600000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	345300000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	335400000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	217600000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	188900000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	33400000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	39600000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	6200000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	-2800000	USD
CY2020	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	-136200000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-941100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	-2700000	USD
CY2019	ipg	Total Reclassificationfrom Aoci TotalReclassificationfromAOCI	13800000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-930000000.0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Before Tax Portion Attributable To Parent OtherComprehensiveIncomeLossBeforeTaxPortionAttributableToParent	22300000	USD
CY2020	ipg	Total Reclassificationfrom Aoci TotalReclassificationfromAOCI	27500000	USD
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-880200000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-2200000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-1900000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax OtherComprehensiveIncomeLossTax	-2300000	USD
CY2020	ipg	Total Reclassificationfrom Aoci TotalReclassificationfromAOCI	27500000	USD
CY2019	ipg	Total Reclassificationfrom Aoci TotalReclassificationfromAOCI	13800000	USD
CY2018	ipg	Total Reclassificationfrom Aoci TotalReclassificationfromAOCI	22100000	USD
CY2020	us-gaap	Severance Costs1 SeveranceCosts1	140400000	USD
CY2019	us-gaap	Severance Costs1 SeveranceCosts1	22000000.0	USD
CY2018	us-gaap	Severance Costs1 SeveranceCosts1	0.0	USD
CY2020	ipg	Lease Restructuring Cost LeaseRestructuringCost	256000000.0	USD
CY2019	ipg	Lease Restructuring Cost LeaseRestructuringCost	11900000	USD
CY2018	ipg	Lease Restructuring Cost LeaseRestructuringCost	0.0	USD
CY2020	us-gaap	Other Restructuring Costs OtherRestructuringCosts	17400000	USD
CY2019	us-gaap	Other Restructuring Costs OtherRestructuringCosts	0.0	USD
CY2018	us-gaap	Other Restructuring Costs OtherRestructuringCosts	0.0	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	413800000	USD
CY2019	us-gaap	Restructuring Charges RestructuringCharges	33900000	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	0.0	USD
CY2020	us-gaap	Severance Costs1 SeveranceCosts1	140400000	USD
CY2020	ipg	Lease Restructuring Cost LeaseRestructuringCost	256000000.0	USD
CY2020	us-gaap	Other Restructuring Costs OtherRestructuringCosts	17400000	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	413800000	USD
CY2020Q4	us-gaap	Restructuring Reserve RestructuringReserve	74600000	USD
CY2020	us-gaap	Restructuring Charges RestructuringCharges	413800000	USD
CY2020Q4	us-gaap	Restructuring And Related Cost Number Of Positions Eliminated Inception To Date Percent RestructuringAndRelatedCostNumberOfPositionsEliminatedInceptionToDatePercent	0.03
CY2020	ipg	Incentive Compensation Plan Initiation Year IncentiveCompensationPlanInitiationYear	2019
CY2020	ipg	Incentive Compensation Plan Initiation Year IncentiveCompensationPlanInitiationYear	2019
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	27000000.0	shares
CY2020	ipg	Incentive Compensation Plan Initiation Year IncentiveCompensationPlanInitiationYear	2019
CY2020	ipg	Share Based Compensation Arrangement By Share Based Payment Award Maximum Award Value Per Employee ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumAwardValuePerEmployee	2000000.0	shares
CY2020	ipg	Incentive Compensation Plan Initiation Year IncentiveCompensationPlanInitiationYear	2019
CY2020	ipg	A2019 Pi Ptargetawardpercentagerange A2019PIPtargetawardpercentagerange	range from 0% to 300% of the target amount
CY2020	ipg	A2019 Pi Ptargetawardpercentagerange Executives A2019PIPtargetawardpercentagerangeExecutives	0% to 200%
CY2020	ipg	Cash Awardby Compensation Arrangement Maximum Award Value Per Employee CashAwardbyCompensationArrangementMaximumAwardValuePerEmployee	10000000.0	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	71100000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	82700000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	84600000	USD
CY2020	us-gaap	Deferred Tax Expense From Stock Options Exercised DeferredTaxExpenseFromStockOptionsExercised	17300000	USD
CY2019	us-gaap	Deferred Tax Expense From Stock Options Exercised DeferredTaxExpenseFromStockOptionsExercised	20000000.0	USD
CY2018	us-gaap	Deferred Tax Expense From Stock Options Exercised DeferredTaxExpenseFromStockOptionsExercised	20400000	USD
CY2020	ipg	Award Vesting Period AwardVestingPeriod	two years
CY2020	ipg	Incentive Compensation Plan Initiation Year IncentiveCompensationPlanInitiationYear	2019
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	5300000	USD
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	9100000	USD
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	27900000	USD
CY2020	ipg	Proceedsfrom Stock Options Exercisedincluding Taxes Withheld ProceedsfromStockOptionsExercisedincludingTaxesWithheld	9100000	USD
CY2019	ipg	Proceedsfrom Stock Options Exercisedincluding Taxes Withheld ProceedsfromStockOptionsExercisedincludingTaxesWithheld	8300000	USD
CY2018	ipg	Proceedsfrom Stock Options Exercisedincluding Taxes Withheld ProceedsfromStockOptionsExercisedincludingTaxesWithheld	29000000.0	USD
CY2020	ipg	Tax Withheldon Stock Options Received TaxWithheldonStockOptionsReceived	2600000	USD
CY2019	ipg	Tax Withheldon Stock Options Received TaxWithheldonStockOptionsReceived	4000000.0	USD
CY2018	ipg	Tax Withheldon Stock Options Received TaxWithheldonStockOptionsReceived	13300000	USD
CY2020	ipg	A2019 Pi Ptargetawardpercentagerange A2019PIPtargetawardpercentagerange	range from 0% to 300% of the target amount
CY2020	ipg	A2019 Pi Ptargetawardpercentagerange Executives A2019PIPtargetawardpercentagerangeExecutives	0% to 200%
CY2017	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	3000000.0	shares
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Maximum Employee Subscription Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate	0.10
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Maximum Number Of Shares Per Employee ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumNumberOfSharesPerEmployee	900	shares
CY2020	us-gaap	Employee Stock Ownership Plan Esop Plan Description EmployeeStockOwnershipPlanESOPPlanDescription	90% of the lesser of the average market price of a share on the first business day of the offering period or the average market price of a share on the last business day of the offering period of three months
CY2020	us-gaap	Employee Stock Ownership Plan Esop Shares Contributed To Esop EmployeeStockOwnershipPlanESOPSharesContributedToESOP	10000000.0	shares
CY2020	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	1600000	shares
CY2020Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	1507400000	USD
CY2020Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	95500000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents Fair Value Disclosure CashAndCashEquivalentsFairValueDisclosure	786000000.0	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	114100000	USD
CY2020	us-gaap	Business Combination Contingent Consideration Arrangements Change In Amount Of Contingent Consideration Liability1 BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1	-18600000	USD
CY2020Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	3995000000.0	USD
CY2020Q4	us-gaap	Supplemental Unemployment Benefits Salary Continuation SupplementalUnemploymentBenefitsSalaryContinuation	0	USD
CY2020	ipg	Discountratefloorcontingentacquisitionobligations Discountratefloorcontingentacquisitionobligations	0.010	Rate
CY2020	ipg	Discountrateceilingcontingentacquisitionobligations Discountrateceilingcontingentacquisitionobligations	0.040	Rate
CY2020	ipg	Discountratefloorlongtermdebt Discountratefloorlongtermdebt	0.004	Rate
CY2020	ipg	Discountrateceilinglongtermdebt Discountrateceilinglongtermdebt	0.034	Rate
CY2020	ipg	Number Of Participants Domestic Pension Plan NumberOfParticipantsDomesticPensionPlan	3100
CY2020	ipg	Number Of Participants Postretirement Benefit Plan NumberOfParticipantsPostretirementBenefitPlan	1400
CY2019Q4	ipg	Domestic Pension Plan Discount Rate DomesticPensionPlanDiscountRate	0.0335	Rate
CY2020Q4	ipg	Domestic Pension Plan Discount Rate DomesticPensionPlanDiscountRate	0.0260	Rate
CY2019Q4	ipg	Foreign Pension Plan Discount Rate ForeignPensionPlanDiscountRate	0.0184	Rate
CY2020Q4	ipg	Foreign Pension Plan Discount Rate ForeignPensionPlanDiscountRate	0.0135	Rate
CY2020Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	562500000	USD
CY2019Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	508600000	USD
CY2020Q4	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	1
CY2020Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2019Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2020Q4	us-gaap	Prescription Drug Subsidy Receipts Next Twelve Months PrescriptionDrugSubsidyReceiptsNextTwelveMonths	200000	USD
CY2020Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	188500000	USD
CY2019Q4	us-gaap	Deferred Compensation Liability Current And Noncurrent DeferredCompensationLiabilityCurrentAndNoncurrent	197500000	USD
CY2020	us-gaap	Deferred Compensation Arrangement With Individual Compensation Expense DeferredCompensationArrangementWithIndividualCompensationExpense	11000000.0	USD
CY2019	us-gaap	Deferred Compensation Arrangement With Individual Compensation Expense DeferredCompensationArrangementWithIndividualCompensationExpense	19400000	USD
CY2018	us-gaap	Deferred Compensation Arrangement With Individual Compensation Expense DeferredCompensationArrangementWithIndividualCompensationExpense	10000000.0	USD
CY2020Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	180800000	USD
CY2019Q4	us-gaap	Cash Surrender Value Of Life Insurance CashSurrenderValueOfLifeInsurance	178200000	USD
CY2020	ipg	Depreciationand Amortization Excluding Acquired Intangibles DepreciationandAmortizationExcludingAcquiredIntangibles	204700000	USD
CY2020Q4	us-gaap	Supplemental Unemployment Benefits Disability Related Benefits SupplementalUnemploymentBenefitsDisabilityRelatedBenefits	8700000	USD
CY2019Q4	us-gaap	Supplemental Unemployment Benefits Disability Related Benefits SupplementalUnemploymentBenefitsDisabilityRelatedBenefits	5500000	USD
CY2020	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2	numberOfPeople
CY2020	us-gaap	Revenues Revenues	9061000000.0	USD
CY2019	us-gaap	Revenues Revenues	10221300000	USD
CY2018	us-gaap	Revenues Revenues	9714400000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8064500000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8625100000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	8031600000	USD
CY2020	ipg	Ebita EBITA	674300000	USD
CY2019	ipg	Ebita EBITA	1172000000.0	USD
CY2018	ipg	Ebita EBITA	1046400000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	85900000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	86000000.0	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	37600000	USD
CY2019	ipg	Depreciationand Amortization Excluding Acquired Intangibles DepreciationandAmortizationExcludingAcquiredIntangibles	192500000	USD
CY2018	ipg	Depreciationand Amortization Excluding Acquired Intangibles DepreciationandAmortizationExcludingAcquiredIntangibles	165300000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	167500000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	198500000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	177100000	USD
CY2020Q4	us-gaap	Assets Assets	18042700000	USD
CY2020Q4	us-gaap	Assets Assets	18042700000	USD
CY2019Q4	us-gaap	Assets Assets	17751900000	USD
CY2019Q4	us-gaap	Assets Assets	17751900000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	85900000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	86000000.0	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	37600000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	588400000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	1086000000.0	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	1008800000	USD
CY2020	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-227100000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-207700000	USD
CY2019	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-207700000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-170800000	USD
CY2018	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-170800000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	361300000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	878300000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	838000000.0	USD
CY2020Q4	us-gaap	Noncurrent Assets NoncurrentAssets	2494000000.0	USD
CY2019Q4	us-gaap	Noncurrent Assets NoncurrentAssets	2843800000	USD
CY2020Q4	ipg	Guarantee Obligations Current Carrying Value Leases GuaranteeObligationsCurrentCarryingValueLeases	630800000	USD
CY2019Q4	ipg	Guarantee Obligations Current Carrying Value Leases GuaranteeObligationsCurrentCarryingValueLeases	739100000	USD
CY2020Q4	ipg	Guarantee Obligations Current Carrying Value Creditfacilities GuaranteeObligationsCurrentCarryingValueCreditfacilities	399600000	USD
CY2019Q4	ipg	Guarantee Obligations Current Carrying Value Creditfacilities GuaranteeObligationsCurrentCarryingValueCreditfacilities	293800000	USD
CY2020Q4	ipg	Cashpoolingguarantees Cashpoolingguarantees	109200000	USD
CY2019Q4	ipg	Cashpoolingguarantees Cashpoolingguarantees	207700000	USD
CY2020Q4	ipg	Assets Pledged As Security For Parent Company Guarantees AssetsPledgedAsSecurityForParentCompanyGuarantees	0	USD
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1972100000	USD
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2004800000	USD
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1853400000	USD
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2125900000	USD
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1954600000	USD
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2061400000	USD
CY2020Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2284400000	USD
CY2019Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2433000000.0	USD
CY2020Q1	us-gaap	Recovery Of Direct Costs RecoveryOfDirectCosts	387700000	USD
CY2019Q1	us-gaap	Recovery Of Direct Costs RecoveryOfDirectCosts	356400000	USD
CY2020Q2	us-gaap	Recovery Of Direct Costs RecoveryOfDirectCosts	172300000	USD
CY2019Q2	us-gaap	Recovery Of Direct Costs RecoveryOfDirectCosts	394300000	USD
CY2020Q3	us-gaap	Recovery Of Direct Costs RecoveryOfDirectCosts	170900000	USD
CY2019Q3	us-gaap	Recovery Of Direct Costs RecoveryOfDirectCosts	376700000	USD
CY2020Q4	us-gaap	Recovery Of Direct Costs RecoveryOfDirectCosts	265600000	USD
CY2019Q4	us-gaap	Recovery Of Direct Costs RecoveryOfDirectCosts	468800000	USD
CY2020Q1	us-gaap	Revenues Revenues	2359800000	USD
CY2019Q1	us-gaap	Revenues Revenues	2361200000	USD
CY2020Q2	us-gaap	Revenues Revenues	2025700000	USD
CY2019Q2	us-gaap	Revenues Revenues	2520200000	USD
CY2020Q3	us-gaap	Revenues Revenues	2125500000	USD
CY2019Q3	us-gaap	Revenues Revenues	2438100000	USD
CY2020Q4	us-gaap	Revenues Revenues	2550000000.0	USD
CY2019Q4	us-gaap	Revenues Revenues	2901800000	USD
CY2020Q1	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	22400000	USD
CY2020Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1422800000	USD
CY2019Q1	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1421100000	USD
CY2020Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1306100000	USD
CY2019Q2	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1381200000	USD
CY2020Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1269900000	USD
CY2019Q3	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1334400000	USD
CY2020Q4	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1346200000	USD
CY2019Q4	us-gaap	Labor And Related Expense LaborAndRelatedExpense	1432100000	USD
CY2020Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	378200000	USD
CY2019Q1	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	389200000	USD
CY2020Q2	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	317000000.0	USD
CY2019Q2	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	387300000	USD
CY2020Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	307900000	USD
CY2019Q3	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	367900000	USD
CY2020Q4	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	364800000	USD
CY2019Q4	us-gaap	General And Administrative Expense GeneralAndAdministrativeExpense	419700000	USD
CY2020Q1	ipg	Recoveryof Direct Costs Expenses RecoveryofDirectCostsExpenses	387700000	USD
CY2019Q1	ipg	Recoveryof Direct Costs Expenses RecoveryofDirectCostsExpenses	356400000	USD
CY2020Q2	ipg	Recoveryof Direct Costs Expenses RecoveryofDirectCostsExpenses	172300000	USD
CY2019Q2	ipg	Recoveryof Direct Costs Expenses RecoveryofDirectCostsExpenses	394300000	USD
CY2020Q3	ipg	Recoveryof Direct Costs Expenses RecoveryofDirectCostsExpenses	170900000	USD
CY2019Q3	ipg	Recoveryof Direct Costs Expenses RecoveryofDirectCostsExpenses	376700000	USD
CY2020Q4	ipg	Recoveryof Direct Costs Expenses RecoveryofDirectCostsExpenses	265600000	USD
CY2019Q4	ipg	Recoveryof Direct Costs Expenses RecoveryofDirectCostsExpenses	468800000	USD
CY2020Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2188700000	USD
CY2019Q1	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2166700000	USD
CY2020Q2	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1795400000	USD
CY2019Q2	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2162800000	USD
CY2020Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1748700000	USD
CY2019Q3	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2079000000.0	USD
CY2020Q4	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1976600000	USD
CY2019Q4	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2320600000	USD
CY2019Q1	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	41400000	USD
CY2020Q2	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	4100000	USD
CY2019Q2	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	18100000	USD
CY2020Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	9900000	USD
CY2019Q3	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	9800000	USD
CY2020Q4	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	22400000	USD
CY2019Q4	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	24500000	USD
CY2020Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	72800000	USD
CY2019Q1	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	71100000	USD
CY2020Q2	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	73100000	USD
CY2019Q2	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	73000000.0	USD
CY2020Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	71000000.0	USD
CY2019Q3	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	69000000.0	USD
CY2020Q4	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	73700000	USD
CY2019Q4	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	65400000	USD
CY2020Q1	us-gaap	Restructuring Charges RestructuringCharges	0.0	USD
CY2019Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-6900000	USD
CY2019Q1	us-gaap	Restructuring Charges RestructuringCharges	31800000	USD
CY2020Q2	us-gaap	Restructuring Charges RestructuringCharges	112600000	USD
CY2019Q2	us-gaap	Restructuring Charges RestructuringCharges	2100000	USD
CY2020Q3	us-gaap	Restructuring Charges RestructuringCharges	47300000	USD
CY2019Q3	us-gaap	Restructuring Charges RestructuringCharges	0.0	USD
CY2020Q4	us-gaap	Restructuring Charges RestructuringCharges	253900000	USD
CY2019Q4	us-gaap	Restructuring Charges RestructuringCharges	0.0	USD
CY2020Q1	us-gaap	Operating Expenses OperatingExpenses	2283900000	USD
CY2019Q1	us-gaap	Operating Expenses OperatingExpenses	2311000000.0	USD
CY2020Q2	us-gaap	Operating Expenses OperatingExpenses	1985200000	USD
CY2019Q2	us-gaap	Operating Expenses OperatingExpenses	2256000000.0	USD
CY2020Q3	us-gaap	Operating Expenses OperatingExpenses	1876900000	USD
CY2019Q3	us-gaap	Operating Expenses OperatingExpenses	2157800000	USD
CY2020Q4	us-gaap	Operating Expenses OperatingExpenses	2326600000	USD
CY2019Q4	us-gaap	Operating Expenses OperatingExpenses	2410500000	USD
CY2020Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	75900000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	50200000	USD
CY2020Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	40500000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	264200000	USD
CY2020Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	248600000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	280300000	USD
CY2020Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	223400000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	491300000	USD
CY2020Q1	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-34100000	USD
CY2019Q1	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-42000000.0	USD
CY2020Q2	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-43900000	USD
CY2019Q2	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-43900000	USD
CY2020Q3	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-44700000	USD
CY2019Q3	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-40200000	USD
CY2020Q4	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-40000000.0	USD
CY2019Q4	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	-38700000	USD
CY2020Q1	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-21800000	USD
CY2020Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-21500000	USD
CY2019Q2	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-3800000	USD
CY2020Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-11300000	USD
CY2019Q3	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-7400000	USD
CY2020Q4	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-9800000	USD
CY2019Q4	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-24800000	USD
CY2020Q1	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-55900000	USD
CY2019Q1	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-48900000	USD
CY2020Q2	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-65400000	USD
CY2019Q2	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-47700000	USD
CY2020Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-56000000.0	USD
CY2019Q3	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-47600000	USD
CY2020Q4	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-49800000	USD
CY2019Q4	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-63500000	USD
CY2020Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	17200000	USD
CY2019Q1	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	10500000	USD
CY2020Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	19000000.0	USD
CY2019Q2	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	43600000	USD
CY2020Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-86300000	USD
CY2019Q3	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	64600000	USD
CY2020Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	58100000	USD
CY2019Q4	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	86100000	USD
CY2020Q1	us-gaap	Profit Loss ProfitLoss	2600000	USD
CY2019Q1	us-gaap	Profit Loss ProfitLoss	-9500000	USD
CY2020Q2	us-gaap	Profit Loss ProfitLoss	-43900000	USD
CY2019Q2	us-gaap	Profit Loss ProfitLoss	172800000	USD
CY2020Q3	us-gaap	Profit Loss ProfitLoss	278500000	USD
CY2019Q3	us-gaap	Profit Loss ProfitLoss	168400000	USD
CY2020Q4	us-gaap	Profit Loss ProfitLoss	117000000.0	USD
CY2019Q4	us-gaap	Profit Loss ProfitLoss	342200000	USD
CY2020Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	4700000	USD
CY2019Q1	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-8000000.0	USD
CY2020Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	-45600000	USD
CY2019Q2	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	169500000	USD
CY2020Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	279700000	USD
CY2019Q3	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	165600000	USD
CY2020Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	112300000	USD
CY2019Q4	us-gaap	Net Income Loss Available To Common Stockholders Basic NetIncomeLossAvailableToCommonStockholdersBasic	328900000	USD
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.01
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.02
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.12
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.44
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.72
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.43
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.29
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.85
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.01
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.02
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.12
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.43
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.71
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.42
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.28
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.84
CY2020Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.255
CY2019Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.235
CY2020Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.255
CY2019Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.235
CY2020Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.255
CY2019Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.235
CY2020Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.255
CY2019Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.235
CY2020Q2	us-gaap	Restructuring Charges RestructuringCharges	112600000	USD
CY2020Q3	us-gaap	Restructuring Charges RestructuringCharges	47300000	USD
CY2020Q4	us-gaap	Restructuring Charges RestructuringCharges	253900000	USD
CY2019Q1	us-gaap	Restructuring Charges RestructuringCharges	31800000	USD
CY2019Q2	us-gaap	Restructuring Charges RestructuringCharges	2100000	USD
CY2020Q1	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	23300000	USD
CY2020Q2	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	19900000	USD
CY2020Q3	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	8600000	USD
CY2020Q4	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	15200000	USD
CY2019Q1	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	8600000	USD
CY2019Q2	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	3200000	USD
CY2019Q3	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	7700000	USD
CY2019Q4	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	23900000	USD
CY2020Q2	us-gaap	Taxes Other TaxesOther	-10400000	USD
CY2020Q3	us-gaap	Taxes Other TaxesOther	-3200000	USD
CY2020Q3	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	136200000	USD
CY2019Q2	us-gaap	Tax Adjustments Settlements And Unusual Provisions TaxAdjustmentsSettlementsAndUnusualProvisions	13900000	USD
CY2019Q4	ipg	Reversalofvaluationallowance Reversalofvaluationallowance	25300000	USD

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$IPG
INTERPUBLIC GROUP OF COMPANIES, INC. Stock $ipg

2020 Q4 Form 10-K Financial Statement

#000005164421000012 Filed on February 22, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$IPG INTERPUBLIC GROUP OF COMPANIES, INC. Stock $ipg

2020 Q4 Form 10-K Financial Statement

#000005164421000012 Filed on February 22, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$IPG
INTERPUBLIC GROUP OF COMPANIES, INC. Stock $ipg