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Goodwill and Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill, Gross Carrying Value $ 9,377.6us-gaap_GoodwillGross $ 9,502.6us-gaap_GoodwillGross
Goodwill, Accumulated Amortization 555.4omc_GoodwillAccumulatedAmortization 586.6omc_GoodwillAccumulatedAmortization
Goodwill, Net Carrying Value 8,822.2us-gaap_Goodwill 8,916.0us-gaap_Goodwill
Intangible assets:, Gross Carrying Value 1,000.8us-gaap_FiniteLivedIntangibleAssetsGross 938.3us-gaap_FiniteLivedIntangibleAssetsGross
Intangible assets:, Accumulated Amortization 611.4us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization 552.3us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Intangible assets:, Net Carrying Value 389.4us-gaap_FiniteLivedIntangibleAssetsNet 386.0us-gaap_FiniteLivedIntangibleAssetsNet
Goodwill [Roll Forward]    
Goodwill, January 1 8,916.0us-gaap_Goodwill 8,844.2us-gaap_Goodwill
Goodwill, Acquisitions 222.4us-gaap_GoodwillAcquiredDuringPeriod 69.9us-gaap_GoodwillAcquiredDuringPeriod
Goodwill, Dispositions (3.0)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit (8.5)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit
Goodwill, Foreign currency translation (313.2)us-gaap_GoodwillTranslationAdjustments 10.4us-gaap_GoodwillTranslationAdjustments
Goodwill, December 31 8,822.2us-gaap_Goodwill 8,916.0us-gaap_Goodwill
Goodwill, impairment losses 0us-gaap_GoodwillImpairmentLoss  
Goodwill, accumulated impairment losses 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss  
Goodwill, acquisitions of noncontrolling interests 43.5omc_GoodwillAcquisitionsOfNoncontrollingInterests 12.2omc_GoodwillAcquisitionsOfNoncontrollingInterests
Purchased and internally developed software    
Intangible assets:, Gross Carrying Value 298.7us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
283.2us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Intangible assets:, Accumulated Amortization 221.4us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
217.4us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Intangible assets:, Net Carrying Value 77.3us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
65.8us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ComputerSoftwareIntangibleAssetMember
Customer related and other    
Intangible assets:, Gross Carrying Value 702.1us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
655.1us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Intangible assets:, Accumulated Amortization 390.0us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
334.9us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Intangible assets:, Net Carrying Value $ 312.1us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
$ 320.2us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember