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Savings Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Domestic Tax Authority |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Cost Recognized | $ 43.0us-gaap_DefinedContributionPlanCostRecognized / ipg_DefinedContributionPlansAxis = us-gaap_DomesticCountryMember | $ 37.7us-gaap_DefinedContributionPlanCostRecognized / ipg_DefinedContributionPlansAxis = us-gaap_DomesticCountryMember | $ 35.6us-gaap_DefinedContributionPlanCostRecognized / ipg_DefinedContributionPlansAxis = us-gaap_DomesticCountryMember
Discretionary Company Contribution |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Cost Recognized | 5.2us-gaap_DefinedContributionPlanCostRecognized / ipg_DefinedContributionPlansAxis = ipg_DiscretionaryCompanyContributionMember | 4.9us-gaap_DefinedContributionPlanCostRecognized / ipg_DefinedContributionPlansAxis = ipg_DiscretionaryCompanyContributionMember | 4.8us-gaap_DefinedContributionPlanCostRecognized / ipg_DefinedContributionPlansAxis = ipg_DiscretionaryCompanyContributionMember
Defined Contribution Plans Participant Forfeitures |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Cost Recognized | (3.6)us-gaap_DefinedContributionPlanCostRecognized / ipg_DefinedContributionPlansAxis = ipg_DefinedContributionPlansParticipantForfeituresMember | (3.3)us-gaap_DefinedContributionPlanCostRecognized / ipg_DefinedContributionPlansAxis = ipg_DefinedContributionPlansParticipantForfeituresMember | (3.0)us-gaap_DefinedContributionPlanCostRecognized / ipg_DefinedContributionPlansAxis = ipg_DefinedContributionPlansParticipantForfeituresMember
Foreign Tax Authority |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans |  |  |
Cost Recognized | $ 42.4us-gaap_DefinedContributionPlanCostRecognized / ipg_DefinedContributionPlansAxis = us-gaap_ForeignCountryMember | $ 36.9us-gaap_DefinedContributionPlanCostRecognized / ipg_DefinedContributionPlansAxis = us-gaap_ForeignCountryMember | $ 34.0us-gaap_DefinedContributionPlanCostRecognized / ipg_DefinedContributionPlansAxis = us-gaap_ForeignCountryMember

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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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