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Restructuring and Other Reorganization-Related Costs 2013 Plan (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Restructuring Cost and Reserve  
Line of Credit Facility, Covenant Compliance 3/31/2015
2013 Restructuring Plan  
Restructuring Cost and Reserve  
Beginning liability balance 7.0us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember
Net Restructuring Reversals (0.1)us-gaap_RestructuringCharges
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember
Cash payments (1.1)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember
Restructuring Reserve, Translation and Other Adjustment (0.3)us-gaap_RestructuringReserveTranslationAndOtherAdjustment
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember
Ending liability balance 5.5us-gaap_RestructuringReserve
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember
Severance and termination costs | 2013 Restructuring Plan  
Restructuring Cost and Reserve  
Beginning liability balance 4.4us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember
Net Restructuring Reversals 0us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember
Cash payments (0.9)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember
Restructuring Reserve, Translation and Other Adjustment (0.2)us-gaap_RestructuringReserveTranslationAndOtherAdjustment
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember
Ending liability balance 3.3us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_EmployeeSeveranceMember
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember
Lease termination costs | 2013 Restructuring Plan  
Restructuring Cost and Reserve  
Beginning liability balance 2.6us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RealEstateMember
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember
Net Restructuring Reversals (0.1)us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RealEstateMember
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember
Cash payments (0.2)us-gaap_PaymentsForRestructuring
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RealEstateMember
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember
Restructuring Reserve, Translation and Other Adjustment (0.1)us-gaap_RestructuringReserveTranslationAndOtherAdjustment
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RealEstateMember
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember
Ending liability balance 2.2us-gaap_RestructuringReserve
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_RealEstateMember
/ us-gaap_RestructuringPlanAxis
= ipg_A2013RestructuringPlanMember