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Goodwill and Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Goodwill, Gross Carrying Value $ 9,170.6us-gaap_GoodwillGross   $ 9,377.6us-gaap_GoodwillGross
Goodwill, Accumulated Amortization (530.8)omc_GoodwillAccumulatedAmortization   (555.4)omc_GoodwillAccumulatedAmortization
Goodwill, Net Carrying Value 8,639.8us-gaap_Goodwill 8,986.7us-gaap_Goodwill  
Intangible assets:, Gross Carrying Value 987.6us-gaap_FiniteLivedIntangibleAssetsGross   1,000.8us-gaap_FiniteLivedIntangibleAssetsGross
Intangible assets:, Accumulated Amortization (620.4)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization   (611.4)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets:, Net Carrying Value 367.2us-gaap_FiniteLivedIntangibleAssetsNet   389.4us-gaap_FiniteLivedIntangibleAssetsNet
Goodwill [Roll Forward]      
Goodwill, January 1 8,822.2us-gaap_Goodwill 8,916.0us-gaap_Goodwill  
Goodwill, Acquisitions 65.1us-gaap_GoodwillAcquiredDuringPeriod 51.4us-gaap_GoodwillAcquiredDuringPeriod  
Goodwill, Dispositions (0.3)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit (1.2)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit  
Goodwill, Foreign currency translation (247.2)us-gaap_GoodwillTranslationAdjustments 20.5us-gaap_GoodwillTranslationAdjustments  
Goodwill, March 31 8,639.8us-gaap_Goodwill 8,986.7us-gaap_Goodwill  
Goodwill, impairment losses 0us-gaap_GoodwillImpairmentLoss    
Goodwill, accumulated impairment losses 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss    
Goodwill, acquisitions of noncontrolling interests 1.8omc_GoodwillAcquisitionsOfNoncontrollingInterests 10.9omc_GoodwillAcquisitionsOfNoncontrollingInterests  
Purchased and internally developed software      
Intangible assets:, Gross Carrying Value 296.5us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
  298.7us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Intangible assets:, Accumulated Amortization (222.1)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
  (221.4)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Intangible assets:, Net Carrying Value 74.4us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
  77.3us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Customer related and other      
Intangible assets:, Gross Carrying Value 691.1us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  702.1us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Intangible assets:, Accumulated Amortization (398.3)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  (390.0)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Intangible assets:, Net Carrying Value $ 292.8us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
  $ 312.1us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember