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Leases (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Rent Expense [Abstract]      
Rent expense, net $ 389.8us-gaap_OperatingLeasesRentExpenseNet $ 402.4us-gaap_OperatingLeasesRentExpenseNet $ 416.4us-gaap_OperatingLeasesRentExpenseNet
Future Minimum Lease Payments Under Non-Cancelable Operating Leases [Abstract]      
Operating Leases, Minimum lease payments, 2015 351.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent    
Operating Leases, Minimum lease payments, 2016 247.4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInTwoYears    
Operating Leases, Minimum lease payments, 2017 194.4us-gaap_OperatingLeasesFutureMinimumPaymentsDueInThreeYears    
Operating Leases, Minimum lease payments, 2018 153.5us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFourYears    
Operating Leases, Minimum lease payments, 2019 133.7us-gaap_OperatingLeasesFutureMinimumPaymentsDueInFiveYears    
Operating Leases, Minimum lease payments, Thereafter 529.0us-gaap_OperatingLeasesFutureMinimumPaymentsDueThereafter    
Operating Leases, Minimum lease payments 1,609.3us-gaap_OperatingLeasesFutureMinimumPaymentsDue    
Operating Leases, Minimum lease payments, Sublease rent (13.9)us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals    
Operating Leases, Minimum lease payments, Net rent 1,595.4omc_OperatingLeasesFutureMinimumPaymentsDueNetofFutureMinimumSubleaseRentals    
Future Minimum Lease Payments Under Non-Cancelable Capital Leases [Abstract]      
Capital Leases, Minimum lease payments, 2015 24.0us-gaap_CapitalLeasesFutureMinimumPaymentsDueCurrent    
Capital Leases, Minimum lease payments, 2016 16.1us-gaap_CapitalLeasesFutureMinimumPaymentsDueInTwoYears    
Capital Leases, Minimum lease payments, 2017 9.0us-gaap_CapitalLeasesFutureMinimumPaymentsDueInThreeYears    
Capital Leases, Minimum lease payments, 2018 4.4us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFourYears    
Capital Leases, Minimum lease payments, 2019 3.1us-gaap_CapitalLeasesFutureMinimumPaymentsDueInFiveYears    
Capital Leases, Minimum lease payments, Thereafter 2.1us-gaap_CapitalLeasesFutureMinimumPaymentsDueThereafter    
Capital Leases, Minimum lease payments 58.7us-gaap_CapitalLeasesFutureMinimumPaymentsDue    
Capital Leases, Minimum lease payments, Interest component (1.5)us-gaap_CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments    
Capital Leases, Minimum lease payments, Present value of minimum lease payments 57.2us-gaap_CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments    
Property Under Capital Lease and Capital Lease Obligations [Abstract]      
Property under capital lease, Cost 146.3us-gaap_CapitalLeasedAssetsGross 134.0us-gaap_CapitalLeasedAssetsGross  
Property under capital lease, Accumulated depreciation (90.6)us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation (80.5)us-gaap_CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation  
Property under capital lease 55.7us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet 53.5us-gaap_CapitalLeasesBalanceSheetAssetsByMajorClassNet  
Capital lease obligations, Current 23.2us-gaap_CapitalLeaseObligationsCurrent 22.2us-gaap_CapitalLeaseObligationsCurrent  
Capital lease obligations, Long-term 34.0us-gaap_CapitalLeaseObligationsNoncurrent 33.2us-gaap_CapitalLeaseObligationsNoncurrent  
Capital lease obligations 57.2us-gaap_CapitalLeaseObligations 55.4us-gaap_CapitalLeaseObligations  
Property under capital lease, Depreciation expense 26.1us-gaap_CapitalLeasesIncomeStatementAmortizationExpense 26.4us-gaap_CapitalLeasesIncomeStatementAmortizationExpense 25.9us-gaap_CapitalLeasesIncomeStatementAmortizationExpense
Office [Member]      
Rent Expense [Abstract]      
Office base rent 373.1us-gaap_OperatingLeasesRentExpenseMinimumRentals
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
379.9us-gaap_OperatingLeasesRentExpenseMinimumRentals
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
390.5us-gaap_OperatingLeasesRentExpenseMinimumRentals
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
Third party sublease rent (11.2)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
(10.6)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
(10.4)us-gaap_OperatingLeasesRentExpenseSubleaseRentals1
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
Rent expense, net 361.9us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
369.3us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
380.1us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandAndBuildingMember
Equipment [Member]      
Rent Expense [Abstract]      
Rent expense, net $ 27.9us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
$ 33.1us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember
$ 36.3us-gaap_OperatingLeasesRentExpenseNet
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_MachineryAndEquipmentMember