$OMC
OMNICOM GROUP INC. Stock $omc

$omc Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000002998920000005 Filed on February 11, 2020

Income Statement

Concept	2019 Q4	2019 Q1	2018 Q4
Revenue	$4.141B	$3.469B	$4.087B
YoY Change	1.33%	-4.43%	-2.15%
Cost Of Revenue	$3.035B	$2.877B	$2.986B
YoY Change	1.62%	-5.15%	-1.85%
Gross Profit	$1.107B	$592.1M	$1.101B
YoY Change	0.55%	-0.74%	-2.95%
Gross Profit Margin	26.72%	17.07%	26.93%
Selling, General & Admin	$403.9M	$103.6M	$412.0M
YoY Change	-1.97%	-1.71%	-5.89%
% of Gross Profit	36.5%	17.5%	37.44%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$56.20M	$38.00M	$61.30M
YoY Change	-8.32%	-9.31%	-12.05%
% of Gross Profit	5.08%	6.42%	5.57%
Operating Expenses	$460.1M	$3.040B	$3.460B
YoY Change	-86.7%	-5.23%	-2.55%
Operating Profit	$646.4M	$428.9M	$627.2M
YoY Change	3.06%	1.71%	0.11%
Interest Expense	-$38.50M	$63.00M	-$53.10M
YoY Change	-27.5%	1.12%	6.41%
% of Operating Profit	-5.96%	14.69%	-8.47%
Other Income/Expense, Net
YoY Change
Pretax Income	$607.9M	$382.9M	$574.1M
YoY Change	5.89%	2.16%	-0.42%
Income Tax	$158.9M	$102.7M	$149.7M
% Of Pretax Income	26.14%	26.82%	26.08%
Net Earnings	$415.0M	$263.2M	$399.2M
YoY Change	3.96%	-0.34%	56.92%
Net Earnings / Revenue	10.02%	7.59%	9.77%
Basic Earnings Per Share	$1.90	$1.18	$1.78
Diluted Earnings Per Share	$1.89	$1.17	$1.77
COMMON SHARES
Basic Shares Outstanding	217.7M shares	223.2M shares	224.1M shares
Diluted Shares Outstanding		224.2M shares

Balance Sheet

Concept	2019 Q4	2019 Q1	2018 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$4.309B	$3.455B	$3.658B
YoY Change	17.8%	34.44%	-3.64%
Cash & Equivalents	$4.306B	$3.450B	$3.652B
Short-Term Investments	$4.000M	$5.000M	$6.000M
Other Short-Term Assets	$1.189B	$1.212B	$1.241B
YoY Change	-4.24%	1.72%	10.33%
Inventory
Prepaid Expenses
Receivables	$7.829B	$7.037B	$7.666B
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$14.58B	$13.07B	$13.73B
YoY Change	6.25%	5.95%	-2.76%
LONG-TERM ASSETS
Property, Plant & Equipment	$663.4M	$686.4M	$694.4M
YoY Change	-4.46%	-0.77%	0.51%
Goodwill	$9.441B	$9.379B	$9.384B
YoY Change	0.6%	-2.66%	0.5%
Intangibles	$338.2M	$367.9M	$382.8M
YoY Change	-11.65%	-13.37%	3.91%
Long-Term Investments	$106.8M	$118.4M	$120.9M
YoY Change	-11.66%	-3.27%	0.5%
Other Assets	$251.5M	$288.7M	$307.7M
YoY Change	-18.26%	-3.89%	3.22%
Total Long-Term Assets	$12.20B	$12.82B	$10.89B
YoY Change	12.02%	14.74%	0.69%
TOTAL ASSETS
Total Short-Term Assets	$14.58B	$13.07B	$13.73B
Total Long-Term Assets	$12.20B	$12.82B	$10.89B
Total Assets	$26.78B	$25.89B	$24.62B
YoY Change	8.8%	10.13%	-1.26%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$11.77B	$10.34B	$11.46B
YoY Change	2.65%	1.81%	-0.95%
Accrued Expenses	$290.0M	$256.0M
YoY Change
Deferred Revenue	$1.215B	$1.104B	$1.159B
YoY Change	4.86%	-9.08%	-8.5%
Short-Term Debt	$10.10M	$595.4M	$8.100M
YoY Change	24.69%	6823.26%	-31.36%
Long-Term Debt Due	$649.0M	$499.8M	$499.6M
YoY Change	29.9%
Total Short-Term Liabilities	$15.98B	$14.91B	$15.27B
YoY Change	4.65%	9.66%	1.07%
LONG-TERM LIABILITIES
Long-Term Debt	$4.624B	$4.492B	$4.384B
YoY Change	5.47%	-8.05%	-10.77%
Other Long-Term Liabilities	$1.007B	$1.044B	$1.198B
YoY Change	-15.95%	-11.73%	9.77%
Total Long-Term Liabilities	$1.007B	$1.044B	$1.198B
YoY Change	-15.95%	-11.73%	9.77%
TOTAL LIABILITIES
Total Short-Term Liabilities	$15.98B	$14.91B	$15.27B
Total Long-Term Liabilities	$1.007B	$1.044B	$1.198B
Total Liabilities	$16.99B	$15.96B	$16.47B
YoY Change	3.16%	7.95%	1.65%
SHAREHOLDERS EQUITY
Retained Earnings	$7.806B	$7.157B	$7.016B
YoY Change	11.26%	12.53%	12.97%
Common Stock	$805.5M	$762.6M	$773.4M
YoY Change	4.15%	-13.1%	-11.4%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$4.560B	$4.288B	$4.014B
YoY Change	13.61%	14.78%	14.51%
Treasury Stock Shares	80.10M shares		73.30M shares
Shareholders Equity	$2.854B	$2.413B	$2.547B
YoY Change
Total Liabilities & Shareholders Equity	$26.78B	$25.89B	$24.62B
YoY Change	8.8%	10.13%	-1.26%

Cashflow Statement

Concept	2019 Q4	2019 Q1	2018 Q4
OPERATING ACTIVITIES
Net Income	$415.0M	$263.2M	$399.2M
YoY Change	3.96%	-0.34%	56.92%
Depreciation, Depletion And Amortization	$56.20M	$38.00M	$61.30M
YoY Change	-8.32%	-9.31%	-12.05%
Cash From Operating Activities	$2.088B	-$395.6M	$1.961B
YoY Change	6.48%	-36.28%	-10.05%
INVESTING ACTIVITIES
Capital Expenditures	-$25.20M	$27.20M	-$79.50M
YoY Change	-68.3%	-24.86%	66.67%
Acquisitions
YoY Change
Other Investing Activities	-$700.0K	$64.20M	-$10.30M
YoY Change	-93.2%	-137.48%	-205.1%
Cash From Investing Activities	-$25.90M	$37.00M	-$89.80M
YoY Change	-71.16%	-117.83%	136.94%
FINANCING ACTIVITIES
Cash Dividend Paid		$134.8M
YoY Change		-2.95%
Common Stock Issuance & Retirement, Net		$286.1M
YoY Change		22.95%
Debt Paid & Issued, Net		$0.00
YoY Change
Cash From Financing Activities	-289.2M	$132.3M	-264.5M
YoY Change	9.34%	-130.99%	19.85%
NET CHANGE
Cash From Operating Activities	2.088B	-$395.6M	1.961B
Cash From Investing Activities	-25.90M	$37.00M	-89.80M
Cash From Financing Activities	-289.2M	$132.3M	-264.5M
Net Change In Cash	1.773B	-$202.7M	1.607B
YoY Change	10.34%	-83.85%	-16.38%
FREE CASH FLOW
Cash From Operating Activities	$2.088B	-$395.6M	$1.961B
Capital Expenditures	-$25.20M	$27.20M	-$79.50M
Free Cash Flow	$2.113B	-$422.8M	$2.040B
YoY Change	3.56%	-35.65%	-8.4%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2019	dei	Entity Central Index Key EntityCentralIndexKey	0000029989
CY2019	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Period End Date DocumentPeriodEndDate	2019-12-31
CY2019	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2019
CY2019	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2019	dei	Document Transition Report DocumentTransitionReport	false
CY2019	dei	Amendment Flag AmendmentFlag	false
CY2019	dei	Document Type DocumentType	10-K
CY2019	dei	Document Annual Report DocumentAnnualReport	true
CY2019	dei	Entity File Number EntityFileNumber	1-10551
CY2019	dei	Entity Registrant Name EntityRegistrantName	OMNICOM GROUP INC.
CY2019	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	NY
CY2019	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	13-1514814
CY2019	dei	Entity Address Address Line1 EntityAddressAddressLine1	437 Madison Avenue
CY2019	dei	Entity Address City Or Town EntityAddressCityOrTown	New York
CY2019	dei	Entity Address State Or Province EntityAddressStateOrProvince	NY
CY2019	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	10022
CY2019	dei	City Area Code CityAreaCode	212
CY2019	dei	Local Phone Number LocalPhoneNumber	415-3600
CY2019	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2019	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2019	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2019	dei	Entity Shell Company EntityShellCompany	false
CY2019	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2019	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2019	dei	Entity Small Business EntitySmallBusiness	false
CY2019	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
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CY2019	us-gaap	Net Income Loss NetIncomeLoss	1339100000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1326400000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	1088400000	USD
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.09
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.85
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.68
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.06
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.83
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.65
CY2019	us-gaap	Profit Loss ProfitLoss	1435900000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1440500000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-4000000.0	USD
CY2017	us-gaap	Profit Loss ProfitLoss	1192200000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-5500000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-5600000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesBeforeTax	-5300000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-1600000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-1600000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	-2100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-3900000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	-3200000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	45500000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	-10400000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Before Reclassification Adjustments And Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentBeforeReclassificationAdjustmentsAndTax	12200000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	8700000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	16600000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans Before Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansBeforeTax	16100000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	10700000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-7900000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-1700000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	26100000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-19100000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-2200000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodBeforeTax	800000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	0	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	300000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Investment Transferred From Available For Sale To Equity Method After Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForInvestmentTransferredFromAvailableForSaleToEquityMethodAfterTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Investment Transferred From Available For Sale To Equity Method After Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForInvestmentTransferredFromAvailableForSaleToEquityMethodAfterTax	-300000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Investment Transferred From Available For Sale To Equity Method After Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAociForInvestmentTransferredFromAvailableForSaleToEquityMethodAfterTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	0	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	300000	USD
CY2017	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	500000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	74900000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-319100000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	412700000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	52700000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-295700000	USD
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	418600000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1488600000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1144800000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	1610800000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	96300000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	83900000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	129400000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1392300000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1060900000	USD
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	1481400000	USD
CY2019Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3373700000	USD
CY2018Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3106900000	USD
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	3152200000	USD
CY2019	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.60
CY2018	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.40
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	2.25
CY2019	us-gaap	Profit Loss ProfitLoss	1435900000	USD
CY2018	us-gaap	Profit Loss ProfitLoss	1440500000	USD
CY2017	us-gaap	Profit Loss ProfitLoss	1192200000	USD
CY2019	us-gaap	Depreciation Depreciation	147700000	USD
CY2018	us-gaap	Depreciation Depreciation	161500000	USD
CY2017	us-gaap	Depreciation Depreciation	168300000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	83800000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	102500000	USD
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	113800000	USD
CY2019	us-gaap	Amortization Of Deferred Hedge Gains AmortizationOfDeferredHedgeGains	-14800000	USD
CY2018	us-gaap	Amortization Of Deferred Hedge Gains AmortizationOfDeferredHedgeGains	-12900000	USD
CY2017	us-gaap	Amortization Of Deferred Hedge Gains AmortizationOfDeferredHedgeGains	-12900000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	72500000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	70500000	USD
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	80200000	USD
CY2019	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2018	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	178400000	USD
CY2017	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2019	us-gaap	Tax Cuts And Jobs Act Of2017 Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit	0	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit	28900000	USD
CY2017	us-gaap	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit	106300000	USD
CY2019	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	5800000	USD
CY2018	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	29200000	USD
CY2017	us-gaap	Other Operating Activities Cash Flow Statement OtherOperatingActivitiesCashFlowStatement	27500000	USD
CY2019	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	-125100000	USD
CY2018	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	-80500000	USD
CY2017	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	-348500000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1856000000.0	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1722300000	USD
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	2023900000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	102200000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	195700000	USD
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	156000000.0	USD
CY2019	us-gaap	Payments To Acquire Businesses And Interest In Affiliates PaymentsToAcquireBusinessesAndInterestInAffiliates	10000000.0	USD
CY2018	us-gaap	Payments To Acquire Businesses And Interest In Affiliates PaymentsToAcquireBusinessesAndInterestInAffiliates	350400000	USD
CY2017	us-gaap	Payments To Acquire Businesses And Interest In Affiliates PaymentsToAcquireBusinessesAndInterestInAffiliates	26300000	USD
CY2019	us-gaap	Proceeds From Divestiture Of Businesses And Interests In Affiliates ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates	79400000	USD
CY2018	us-gaap	Proceeds From Divestiture Of Businesses And Interests In Affiliates ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates	308400000	USD
CY2017	us-gaap	Proceeds From Divestiture Of Businesses And Interests In Affiliates ProceedsFromDivestitureOfBusinessesAndInterestsInAffiliates	0	USD
CY2019	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	-1900000	USD
CY2018	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	-15900000	USD
CY2017	us-gaap	Payments For Proceeds From Investments PaymentsForProceedsFromInvestments	-66900000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-30900000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-221800000	USD
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-115400000	USD
CY2019	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1112400000	USD
CY2018	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	0	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	900000000.0	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	0	USD
CY2019	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	2000000.0	USD
CY2018	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	0	USD
CY2017	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-18100000	USD
CY2019	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	564300000	USD
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	548500000	USD
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	515200000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	610200000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	581300000	USD
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	568400000	USD
CY2019	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	6500000	USD
CY2018	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	13000000.0	USD
CY2017	us-gaap	Proceeds From Stock Plans ProceedsFromStockPlans	10700000	USD
CY2019	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	51400000	USD
CY2018	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	43600000	USD
CY2017	us-gaap	Payments To Minority Shareholders PaymentsToMinorityShareholders	17000000.0	USD
CY2019	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	97300000	USD
CY2018	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	134900000	USD
CY2017	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	101700000	USD
CY2019	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	64600000	USD
CY2018	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	99000000.0	USD
CY2017	us-gaap	Payment For Contingent Consideration Liability Financing Activities PaymentForContingentConsiderationLiabilityFinancingActivities	108400000	USD
CY2019	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-55100000	USD
CY2018	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-46800000	USD
CY2017	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-24500000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1222000000.0	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1441100000	USD
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-1342600000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	50200000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	-203000000.0	USD
CY2017	us-gaap	Effect Of Exchange Rate On Cash And Cash Equivalents EffectOfExchangeRateOnCashAndCashEquivalents	227900000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	653300000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-143600000	USD
CY2017	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	793800000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3652400000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3796000000.0	USD
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3002200000	USD
CY2019Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	4305700000	USD
CY2018Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3652400000	USD
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	3796000000.0	USD
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	1241400000	USD
CY2019Q1	us-gaap	Other Assets Current OtherAssetsCurrent	1212200000	USD
CY2018Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	0	USD
CY2019Q1	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1306500000	USD
CY2018Q4	us-gaap	Assets Assets	24617000000.0	USD
CY2019Q1	us-gaap	Assets Assets	25894300000	USD
CY2018Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	1958600000	USD
CY2019Q1	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	2131100000	USD
CY2018Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	0	USD
CY2019Q1	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	1258500000	USD
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1197800000	USD
CY2019Q1	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	1044100000	USD
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	24617000000.0	USD
CY2019Q1	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	25894300000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	2100000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-11200000	USD
CY2017	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-7800000	USD
CY2019	us-gaap	Concentration Risk Credit Risk ConcentrationRiskCreditRisk	<span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%;">Concentration of Credit Risk.</span><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;"> We provide advertising, marketing and corporate communications services to several thousand clients that operate in nearly every industry sector of the global economy and we grant credit to qualified clients in the normal course of business. Due to the diversified nature of our client base, we do not believe that we are exposed to a concentration of credit risk as our largest client accounted for 3.0% of revenue in 2019.</span>
CY2019	omc	Percentage Of Revenue From Largest Client PercentageOfRevenueFromLargestClient	0.030
CY2019	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:700;line-height:120%;">Reclassifications.</span><span style="background-color:rgb(255,255,255, 0.0);color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%;"> Certain reclassifications have been made to the prior year financial information to conform to the current year presentation.</span>
CY2019	us-gaap	Revenues Revenues	14953700000	USD
CY2018	us-gaap	Revenues Revenues	15290200000	USD
CY2017	us-gaap	Revenues Revenues	15273600000	USD
CY2019	us-gaap	Revenues Revenues	14953700000	USD
CY2018	us-gaap	Revenues Revenues	15290200000	USD
CY2017	us-gaap	Revenues Revenues	15273600000	USD
CY2019Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	689200000	USD
CY2018Q4	us-gaap	Unbilled Contracts Receivable UnbilledContractsReceivable	540100000	USD
CY2019Q4	omc	Media Productionand Other Costs MediaProductionandOtherCosts	568400000	USD
CY2018Q4	omc	Media Productionand Other Costs MediaProductionandOtherCosts	621400000	USD
CY2019Q4	us-gaap	Contract With Customer Asset Gross Current ContractWithCustomerAssetGrossCurrent	1257600000	USD
CY2018Q4	us-gaap	Contract With Customer Asset Gross Current ContractWithCustomerAssetGrossCurrent	1161500000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	1215300000	USD
CY2018Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	1159000000.0	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	1339100000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1326400000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	1088400000	USD
CY2019	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	0	USD
CY2018	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	100000	USD
CY2017	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	1600000	USD
CY2019	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	1339100000	USD
CY2018	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	1326300000	USD
CY2017	us-gaap	Net Income Loss Available To Common Stockholders Diluted NetIncomeLossAvailableToCommonStockholdersDiluted	1086800000	USD
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	219800000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	226600000	shares
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	232300000	shares
CY2019	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1100000	shares
CY2018	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1000000.0	shares
CY2017	us-gaap	Weighted Average Number Diluted Shares Outstanding Adjustment WeightedAverageNumberDilutedSharesOutstandingAdjustment	1600000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	220900000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	227600000	shares
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	233900000	shares
CY2019	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2018	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1000000.0	shares
CY2017	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	1000000.0	shares
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.09
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	5.85
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.68
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.06
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	5.83
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.65
CY2019	us-gaap	Number Of Businesses Acquired NumberOfBusinessesAcquired	2
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	47400000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	107700000	USD
CY2018Q4	us-gaap	Business Combination Contingent Consideration Liability BusinessCombinationContingentConsiderationLiability	146500000	USD
CY2019Q4	us-gaap	Business Combination Contingent Consideration Liability Current BusinessCombinationContingentConsiderationLiabilityCurrent	29500000	USD
CY2018Q4	us-gaap	Business Combination Contingent Consideration Liability Current BusinessCombinationContingentConsiderationLiabilityCurrent	65400000	USD
CY2019Q4	us-gaap	Goodwill Gross GoodwillGross	9957500000	USD
CY2019Q4	omc	Goodwill Accumulated Amortization GoodwillAccumulatedAmortization	517000000.0	USD
CY2019Q4	us-gaap	Goodwill Goodwill	9440500000	USD
CY2018Q4	us-gaap	Goodwill Gross GoodwillGross	9898600000	USD
CY2018Q4	omc	Goodwill Accumulated Amortization GoodwillAccumulatedAmortization	514300000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	9384300000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1097400000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	759200000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	338200000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	1120200000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	737400000	USD
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	382800000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	9384300000	USD
CY2017Q4	us-gaap	Goodwill Goodwill	9337500000	USD
CY2019	omc	Goodwill Acquisitions Of Controlling Interests GoodwillAcquisitionsOfControllingInterests	5500000	USD
CY2018	omc	Goodwill Acquisitions Of Controlling Interests GoodwillAcquisitionsOfControllingInterests	250600000	USD
CY2019	omc	Goodwill Acquisitions Of Noncontrolling Interests GoodwillAcquisitionsOfNoncontrollingInterests	17200000	USD
CY2018	omc	Goodwill Acquisitions Of Noncontrolling Interests GoodwillAcquisitionsOfNoncontrollingInterests	112000000.0	USD
CY2019	omc	Goodwill Contingent Purchase Priceof Acquired Businesses GoodwillContingentPurchasePriceofAcquiredBusinesses	24700000	USD
CY2018	omc	Goodwill Contingent Purchase Priceof Acquired Businesses GoodwillContingentPurchasePriceofAcquiredBusinesses	60000000.0	USD
CY2019	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	19100000	USD
CY2018	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	143600000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	27900000	USD
CY2018	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-232200000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	9440500000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	9384300000	USD
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0	USD
CY2019Q4	us-gaap	Goodwill Impaired Accumulated Impairment Loss GoodwillImpairedAccumulatedImpairmentLoss	0	USD
CY2019Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	10100000	USD
CY2018Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	8100000	USD
CY2019Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.025
CY2018Q4	us-gaap	Short Term Debt Weighted Average Interest Rate ShortTermDebtWeightedAverageInterestRate	0.042
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	5122800000	USD
CY2018Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	4900000000.0	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	-800000	USD
CY2018Q4	us-gaap	Debt Instrument Unamortized Discount Premium Net DebtInstrumentUnamortizedDiscountPremiumNet	-4900000	USD
CY2019Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	20000000.0	USD
CY2018Q4	us-gaap	Unamortized Debt Issuance Expense UnamortizedDebtIssuanceExpense	16400000	USD
CY2019Q4	us-gaap	Deferred Gain Loss On Discontinuation Of Interest Rate Fair Value Hedge DeferredGainLossOnDiscontinuationOfInterestRateFairValueHedge	-30700000	USD
CY2018Q4	us-gaap	Deferred Gain Loss On Discontinuation Of Interest Rate Fair Value Hedge DeferredGainLossOnDiscontinuationOfInterestRateFairValueHedge	-48000000.0	USD
CY2019Q4	us-gaap	Interest Rate Fair Value Hedge Derivative At Fair Value Net InterestRateFairValueHedgeDerivativeAtFairValueNet	0	USD
CY2018Q4	us-gaap	Interest Rate Fair Value Hedge Derivative At Fair Value Net InterestRateFairValueHedgeDerivativeAtFairValueNet	52800000	USD
CY2019Q4	us-gaap	Notes Payable NotesPayable	5134300000	USD
CY2018Q4	us-gaap	Notes Payable NotesPayable	4883700000	USD
CY2019Q4	us-gaap	Notes Payable Current NotesPayableCurrent	602400000	USD
CY2018Q4	us-gaap	Notes Payable Current NotesPayableCurrent	499600000	USD
CY2019Q4	us-gaap	Long Term Notes Payable LongTermNotesPayable	4531900000	USD
CY2018Q4	us-gaap	Long Term Notes Payable LongTermNotesPayable	4384100000	USD
CY2019Q3	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1100000000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	600000000.0	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	0	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	1250000000.0	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	0	USD
CY2019	us-gaap	Debt Related Commitment Fees And Debt Issuance Costs DebtRelatedCommitmentFeesAndDebtIssuanceCosts	4700000	USD
CY2017	us-gaap	Interest Expense Debt InterestExpenseDebt	201600000	USD
CY2017	us-gaap	Interest Expense Commercial Paper InterestExpenseCommercialPaper	12500000	USD
CY2018	us-gaap	Amortization Of Deferred Hedge Gains AmortizationOfDeferredHedgeGains	-12900000	USD
CY2017	us-gaap	Amortization Of Deferred Hedge Gains AmortizationOfDeferredHedgeGains	-12900000	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	750000000.0	USD
CY2019Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	2522800000	USD
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	5122800000	USD
CY2019	us-gaap	Interest Expense Debt InterestExpenseDebt	194600000	USD
CY2018	us-gaap	Interest Expense Debt InterestExpenseDebt	201600000	USD
CY2019	us-gaap	Interest Expense Commercial Paper InterestExpenseCommercialPaper	6500000	USD
CY2018	us-gaap	Interest Expense Commercial Paper InterestExpenseCommercialPaper	9600000	USD
CY2019	omc	Net Interest Expense Interest Rate Swaps NetInterestExpenseInterestRateSwaps	6100000	USD
CY2018	omc	Net Interest Expense Interest Rate Swaps NetInterestExpenseInterestRateSwaps	5200000	USD
CY2017	omc	Net Interest Expense Interest Rate Swaps NetInterestExpenseInterestRateSwaps	-7200000	USD
CY2019	us-gaap	Amortization Of Deferred Hedge Gains AmortizationOfDeferredHedgeGains	-14800000	USD
CY2018	us-gaap	Debt Related Commitment Fees And Debt Issuance Costs DebtRelatedCommitmentFeesAndDebtIssuanceCosts	5600000	USD
CY2017	us-gaap	Debt Related Commitment Fees And Debt Issuance Costs DebtRelatedCommitmentFeesAndDebtIssuanceCosts	5600000	USD
CY2019	us-gaap	Interest Expense Other InterestExpenseOther	47200000	USD
CY2018	us-gaap	Interest Expense Other InterestExpenseOther	57300000	USD
CY2017	us-gaap	Interest Expense Other InterestExpenseOther	49000000.0	USD
CY2019	us-gaap	Interest Expense InterestExpense	244300000	USD
CY2018	us-gaap	Interest Expense InterestExpense	266400000	USD
CY2017	us-gaap	Interest Expense InterestExpense	248600000	USD
CY2019	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	2000000.0	USD
CY2018	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	8900000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	70500000	USD
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	80200000	USD
CY2017	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	3500000	USD
CY2019Q4	us-gaap	Equity Method Investment Underlying Equity In Net Assets EquityMethodInvestmentUnderlyingEquityInNetAssets	37000000.0	USD
CY2018Q4	us-gaap	Equity Method Investment Underlying Equity In Net Assets EquityMethodInvestmentUnderlyingEquityInNetAssets	42900000	USD
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	33000000	shares
CY2019Q4	omc	Stock Awards Other Than Options Conversion Ratio StockAwardsOtherThanOptionsConversionRatio	3.5	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	24648995	shares
CY2019Q4	omc	Stockawardsotherthanoptionssharesavailableforgrant Stockawardsotherthanoptionssharesavailableforgrant	7042570	shares
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	72500000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P5Y
CY2019Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	159200000	USD
CY2019	omc	Excess Tax Benefitfrom Sharebased Compensation ExcessTaxBenefitfromSharebasedCompensation	2800000	USD
CY2018	omc	Excess Tax Benefitfrom Sharebased Compensation ExcessTaxBenefitfromSharebasedCompensation	7400000	USD
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	988050	shares
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	80.37
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	84.94
CY2019	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	57300	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1593422	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	63.11
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	719757	shares
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	27.88
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	1000000	shares
CY2019	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	23.40
CY2018	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	500122	shares
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	24.43
CY2017	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	102335	shares
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	23.40
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	64750	shares
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	84.94
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	105250	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	84.94
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	24000	shares
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	84.94
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	866000	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	83.80
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	988050	shares
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	80.37
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1593422	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	63.11
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	60000	shares
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	68.42
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	117300	shares
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	46.43
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	617422	shares
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	28.61
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	504400000	USD
CY2019Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Outstanding Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions	866000	shares
CY2019Q4	us-gaap	Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range Number Of Exercisable Options ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfExercisableOptions	60000	shares
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	9.87
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P4Y6M
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.020
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.163
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.026
CY2017	us-gaap	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit	106300000	USD
CY2017	us-gaap	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Transition Tax For Accumulated Foreign Earnings Provisional Income Tax Expense TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalIncomeTaxExpense	192100000	USD
CY2017	us-gaap	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateProvisionalIncomeTaxExpenseBenefit	-173300000	USD
CY2017Q4	us-gaap	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Transition Tax For Accumulated Foreign Earnings Provisional Liability TaxCutsAndJobsActOf2017IncompleteAccountingTransitionTaxForAccumulatedForeignEarningsProvisionalLiability	102900000	USD
CY2017	omc	Income Tax Expense Dividend Withholding Taxon Repatriationof Foreign Earnings IncomeTaxExpenseDividendWithholdingTaxonRepatriationofForeignEarnings	87500000	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncomeTaxExpenseBenefit	28900000	USD
CY2019Q4	omc	Tax Cutsand Jobs Act Transition Taxfor Accumulated Foreign Earnings Liability TaxCutsandJobsActTransitionTaxforAccumulatedForeignEarningsLiability	123600000	USD
CY2018Q4	omc	Tax Cutsand Jobs Act Transition Taxfor Accumulated Foreign Earnings Liability TaxCutsandJobsActTransitionTaxforAccumulatedForeignEarningsLiability	139100000	USD
CY2019	omc	Income Tax Expense Gilti IncomeTaxExpenseGILTI	14700000	USD
CY2018	omc	Income Tax Expense Gilti IncomeTaxExpenseGILTI	12900000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	913100000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	643700000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	832400000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	1025200000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	1280600000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	1052500000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1938300000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	33900000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	35500000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1924300000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1924300000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1884900000	USD
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1884900000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	180200000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	273800000	USD
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	458800000	USD
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	36500000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	306900000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	305200000	USD
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	11100000	USD
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	280200000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	521000000.0	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	614500000	USD
CY2017	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	775500000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	19100000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-104200000	USD
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-205500000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-22500000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	2800000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-13200000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-20400000	USD
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	115100000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-16600000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-121800000	USD
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-79300000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	492700000	USD
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	696200000	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.210
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2019	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.005
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.016
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.013
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Percent EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Percent EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent	0.015
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Percent EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent	0.056
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.045
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	0.038
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Foreign Income Tax Rate Differential EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential	-0.038
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.023
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.012
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.260
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.256
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.369
CY2019	us-gaap	Income Tax Reconciliation Tax Settlements IncomeTaxReconciliationTaxSettlements	-10800000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	2200000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	3600000	USD
CY2017	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	2500000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	20000000.0	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	21100000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	210900000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits	209700000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	60600000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	38100000	USD
CY2019Q4	omc	Basis Differences Arising From Acquisitions BasisDifferencesArisingFromAcquisitions	22900000	USD
CY2018Q4	omc	Basis Differences Arising From Acquisitions BasisDifferencesArisingFromAcquisitions	13900000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	29400000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	5200000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	13100000	USD
CY2019Q4	omc	Basis Differences From Short Term Assets And Liabilities BasisDifferencesFromShortTermAssetsAndLiabilities	42200000	USD
CY2018Q4	omc	Basis Differences From Short Term Assets And Liabilities BasisDifferencesFromShortTermAssetsAndLiabilities	35700000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	4600000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	10800000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	341200000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	308200000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	7600000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	3000000.0	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	333600000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	305200000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	598000000.0	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	577500000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	69000000.0	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	69200000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	9000000.0	USD
CY2018Q4	us-gaap	Deferred Tax Liabilities Investment In Noncontrolled Affiliates DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates	9600000	USD
CY2019Q4	omc	Deferred Tax Liabilities Financial Instruments DeferredTaxLiabilitiesFinancialInstruments	900000	USD
CY2018Q4	omc	Deferred Tax Liabilities Financial Instruments DeferredTaxLiabilitiesFinancialInstruments	800000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	676900000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	657100000	USD
CY2019Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	64800000	USD
CY2018Q4	us-gaap	Deferred Income Tax Assets Net DeferredIncomeTaxAssetsNet	61800000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	408100000	USD
CY2018Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	413700000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	7600000	USD
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	3000000.0	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	182800000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	173700000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	12300000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	30100000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	25400000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	5000000.0	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	0	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation	400000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Foreign Currency Translation UnrecognizedTaxBenefitsDecreasesResultingFromForeignCurrencyTranslation	800000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	206800000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	182800000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	179000000.0	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	174000000.0	USD
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	115200000	USD
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	118800000	USD
CY2017	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	112900000	USD
CY2018	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	178400000	USD
CY2018	us-gaap	Restructuring Charges RestructuringCharges	149400000	USD
CY2018	us-gaap	Severance Costs1 SeveranceCosts1	68400000	USD
CY2018	us-gaap	Business Exit Costs1 BusinessExitCosts1	73500000	USD
CY2018Q4	us-gaap	Restructuring Reserve RestructuringReserve	78900000	USD
CY2019	us-gaap	Lease Cost LeaseCost	404100000	USD
CY2018	us-gaap	Other Restructuring Costs OtherRestructuringCosts	7500000	USD
CY2019Q4	us-gaap	Restructuring Reserve RestructuringReserve	25100000	USD
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	83300000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	156600000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-88300000	USD
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	341600000	USD
CY2019	omc	Increase Decrease In Work In Progress And Other Current Assets IncreaseDecreaseInWorkInProgressAndOtherCurrentAssets	99800000	USD
CY2018	omc	Increase Decrease In Work In Progress And Other Current Assets IncreaseDecreaseInWorkInProgressAndOtherCurrentAssets	269300000	USD
CY2017	omc	Increase Decrease In Work In Progress And Other Current Assets IncreaseDecreaseInWorkInProgressAndOtherCurrentAssets	-5400000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	276300000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	242900000	USD
CY2017	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	763200000	USD
CY2019	omc	Increase Decrease In Customer Advances And Other Current Liabilities IncreaseDecreaseInCustomerAdvancesAndOtherCurrentLiabilities	87200000	USD
CY2018	omc	Increase Decrease In Customer Advances And Other Current Liabilities IncreaseDecreaseInCustomerAdvancesAndOtherCurrentLiabilities	54300000	USD
CY2017	omc	Increase Decrease In Customer Advances And Other Current Liabilities IncreaseDecreaseInCustomerAdvancesAndOtherCurrentLiabilities	4800000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-18000000.0	USD
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	35700000	USD
CY2017	us-gaap	Interest Paid InterestPaid	226200000	USD
CY2019	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	-125100000	USD
CY2018	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	-80500000	USD
CY2017	us-gaap	Increase Decrease In Operating Capital IncreaseDecreaseInOperatingCapital	-348500000	USD
CY2019	us-gaap	Income Taxes Paid IncomeTaxesPaid	361000000.0	USD
CY2018	us-gaap	Income Taxes Paid IncomeTaxesPaid	590900000	USD
CY2017	us-gaap	Income Taxes Paid IncomeTaxesPaid	566000000.0	USD
CY2019	us-gaap	Interest Paid InterestPaid	246300000	USD
CY2018	us-gaap	Interest Paid InterestPaid	243200000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	1816700000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	54100000	USD
CY2017	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Purchase Of Interest By Parent ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent	27500000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	1339100000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	1326400000	USD
CY2017	us-gaap	Net Income Loss NetIncomeLoss	1088400000	USD
CY2019	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Sale Of Interest By Parent ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesSaleOfInterestByParent	0	USD
CY2018	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Sale Of Interest By Parent ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesSaleOfInterestByParent	4400000	USD
CY2017	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Sale Of Interest By Parent ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesSaleOfInterestByParent	1800000	USD
CY2019	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Purchase Of Interest By Parent ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent	22300000	USD
CY2018	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Purchase Of Interest By Parent ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesPurchaseOfInterestByParent	44100000	USD
CY2019	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Net ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet	-22300000	USD
CY2018	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Net ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet	-39700000	USD
CY2017	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Changes Net ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangesNet	-25700000	USD
CY2019	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Change Due To Net Income Attributable To Parent And Effects Of Changes Net ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet	1316800000	USD
CY2018	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Change Due To Net Income Attributable To Parent And Effects Of Changes Net ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet	1286700000	USD
CY2017	us-gaap	Consolidation Less Than Wholly Owned Subsidiary Parent Ownership Interest Change Due To Net Income Attributable To Parent And Effects Of Changes Net ConsolidationLessThanWhollyOwnedSubsidiaryParentOwnershipInterestChangeDueToNetIncomeAttributableToParentAndEffectsOfChangesNet	1062700000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	317800000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	38200000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	4900000	USD
CY2019	us-gaap	Sublease Income SubleaseIncome	5100000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	43200000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	5100000	USD
CY2019	omc	Lease Cost Total Finance Leases LeaseCostTotalFinanceLeases	48300000	USD
CY2018	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	7200000	USD
CY2017	us-gaap	Operating Leases Rent Expense Sublease Rentals1 OperatingLeasesRentExpenseSubleaseRentals1	6300000	USD
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	304400000	USD
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	350500000	USD
CY2019Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	1398300000	USD
CY2019Q4	us-gaap	Operating Lease Liability Current OperatingLeaseLiabilityCurrent	290300000	USD
CY2019Q4	us-gaap	Operating Lease Liability Noncurrent OperatingLeaseLiabilityNoncurrent	1274700000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	1565000000.0	USD
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P8Y2M12D
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.038
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	138700000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	46600000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	92100000	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	138700000	USD
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P3Y4M24D
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.043
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	344400000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	49700000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	289900000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	40200000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	233600000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	28800000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	178700000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	16200000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	155000000.0	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	6800000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	642500000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	3900000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	1844100000	USD
CY2019Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	145600000	USD
CY2019Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	279100000	USD
CY2019Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	6900000	USD
CY2019Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	1565000000.0	USD
CY2019Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	138700000	USD
CY2018	us-gaap	Capital Leases Income Statement Amortization Expense CapitalLeasesIncomeStatementAmortizationExpense	36700000	USD
CY2018Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	258200000	USD
CY2018Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	133800000	USD
CY2018Q4	us-gaap	Capital Leases Balance Sheet Assets By Major Class Net CapitalLeasesBalanceSheetAssetsByMajorClassNet	124400000	USD
CY2018Q4	us-gaap	Capital Lease Obligations Current CapitalLeaseObligationsCurrent	38600000	USD
CY2018Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	88900000	USD
CY2018Q4	us-gaap	Capital Lease Obligations CapitalLeaseObligations	127500000	USD
CY2017	us-gaap	Capital Leases Income Statement Amortization Expense CapitalLeasesIncomeStatementAmortizationExpense	31100000	USD
CY2019Q4	us-gaap	Redeemable Noncontrolling Interest Equity Fair Value RedeemableNoncontrollingInterestEquityFairValue	207300000	USD
CY2019Q4	omc	Redeemable Noncontrolling Interests Currently Exercisable RedeemableNoncontrollingInterestsCurrentlyExercisable	181600000	USD
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-963000000.0	USD
CY2018	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-281600000	USD
CY2018	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-16100000	USD
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1228500000	USD
CY2018	us-gaap	Tax Cuts And Jobs Act Of2017 Reclassification From Aoci To Retained Earnings Tax Effect TaxCutsAndJobsActOf2017ReclassificationFromAociToRetainedEarningsTaxEffect	-22300000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	43100000	USD
CY2019	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-10100000	USD
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-1197600000	USD
CY2019Q1	us-gaap	Revenues Revenues	3468900000	USD
CY2019Q2	us-gaap	Revenues Revenues	3719800000	USD
CY2019Q3	us-gaap	Revenues Revenues	3623800000	USD
CY2019Q4	us-gaap	Revenues Revenues	4141200000	USD
CY2018Q1	us-gaap	Revenues Revenues	3629600000	USD
CY2018Q2	us-gaap	Revenues Revenues	3859600000	USD
CY2018Q3	us-gaap	Revenues Revenues	3714300000	USD
CY2018Q4	us-gaap	Revenues Revenues	4086700000	USD
CY2019Q1	us-gaap	Costs And Expenses CostsAndExpenses	3040000000.0	USD
CY2019Q2	us-gaap	Costs And Expenses CostsAndExpenses	3146100000	USD
CY2019Q3	us-gaap	Costs And Expenses CostsAndExpenses	3150500000	USD
CY2019Q4	us-gaap	Costs And Expenses CostsAndExpenses	3494800000	USD
CY2018Q1	us-gaap	Costs And Expenses CostsAndExpenses	3207900000	USD
CY2018Q2	us-gaap	Costs And Expenses CostsAndExpenses	3277300000	USD
CY2018Q3	us-gaap	Costs And Expenses CostsAndExpenses	3212000000.0	USD
CY2018Q4	us-gaap	Costs And Expenses CostsAndExpenses	3459500000	USD
CY2019Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	428900000	USD
CY2019Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	573700000	USD
CY2019Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	473300000	USD
CY2019Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	646400000	USD
CY2018Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	421700000	USD
CY2018Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	582300000	USD
CY2018Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	502300000	USD
CY2018Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	627200000	USD
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	263200000	USD
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	370700000	USD
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	290200000	USD
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	415000000.0	USD
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	264100000	USD
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	364200000	USD
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	298900000	USD
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	399200000	USD
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.18
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.69
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.33
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.90
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.15
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.61
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.33
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.78
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.17
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.68
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.32
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.89
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.14
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.60
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.32
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.77

Files In Submission

Name	View Source	Status
0000029989-20-000005-index-headers.html	Edgar Link	pending
0000029989-20-000005-index.html	Edgar Link	pending
0000029989-20-000005.txt	Edgar Link	pending
0000029989-20-000005-xbrl.zip	Edgar Link	pending
a2019q4exhibit21.htm	Edgar Link	pending
a2019q4exhibit23.htm	Edgar Link	pending
a2019q4exhibit311.htm	Edgar Link	pending
a2019q4exhibit312.htm	Edgar Link	pending
a2019q4exhibit32.htm	Edgar Link	pending
a2019q4exhibit417.htm	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xlsx	Edgar Link	pending
MetaLinks.json	Edgar Link	pending
omc-20191231.htm	Edgar Link	pending
omc-20191231.xsd	Edgar Link	pending
omc-20191231_cal.xml	Edgar Link	unprocessable
omc-20191231_def.xml	Edgar Link	unprocessable
omc-20191231_htm.xml	Edgar Link	completed
omc-20191231_lab.xml	Edgar Link	unprocessable
omc-20191231_pre.xml	Edgar Link	unprocessable
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report.css	Edgar Link	pending
Show.js	Edgar Link	pending

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$OMC
OMNICOM GROUP INC. Stock $omc

2019 Q4 Form 10-K Financial Statement

#000002998920000005 Filed on February 11, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OMC OMNICOM GROUP INC. Stock $omc

2019 Q4 Form 10-K Financial Statement

#000002998920000005 Filed on February 11, 2020

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$OMC
OMNICOM GROUP INC. Stock $omc