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Fair Value Unobservable Inputs (Details) (Mandatorily redeemable noncontrolling interests, USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Mandatorily redeemable noncontrolling interests |  |
Fair value assets and liabilities measured on recurring basis unobservable input reconciliation |  |
Balance at beginning of period, mandatorily redeemable noncontrolling interests | $ 27.0ipg_MandatorilyRedeemableNoncontrollingInterestsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ipg_MandatorilyRedeemableNoncontrollingInterestsMember | $ 25.3ipg_MandatorilyRedeemableNoncontrollingInterestsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ipg_MandatorilyRedeemableNoncontrollingInterestsMember
Level 3 additions | 5.6us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases / us-gaap_FairValueByAssetClassAxis = ipg_MandatorilyRedeemableNoncontrollingInterestsMember | 0.2us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityPurchases / us-gaap_FairValueByAssetClassAxis = ipg_MandatorilyRedeemableNoncontrollingInterestsMember
Level 3 reductions | (0.8)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FairValueByAssetClassAxis = ipg_MandatorilyRedeemableNoncontrollingInterestsMember | 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilitySettlements / us-gaap_FairValueByAssetClassAxis = ipg_MandatorilyRedeemableNoncontrollingInterestsMember
Realized losses included in net income | 1.0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByAssetClassAxis = ipg_MandatorilyRedeemableNoncontrollingInterestsMember | 1.5us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisLiabilityGainLossIncludedInEarnings / us-gaap_FairValueByAssetClassAxis = ipg_MandatorilyRedeemableNoncontrollingInterestsMember
Foreign currency translation | 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = ipg_MandatorilyRedeemableNoncontrollingInterestsMember | 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_FairValueByAssetClassAxis = ipg_MandatorilyRedeemableNoncontrollingInterestsMember
Balance at end of period, mandatorily redeemable noncontrolling interests | $ 32.8ipg_MandatorilyRedeemableNoncontrollingInterestsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ipg_MandatorilyRedeemableNoncontrollingInterestsMember | $ 27.0ipg_MandatorilyRedeemableNoncontrollingInterestsFairValueDisclosure / us-gaap_FairValueByAssetClassAxis = ipg_MandatorilyRedeemableNoncontrollingInterestsMember

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- Details
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- Definition Fair value of mandatorily redeemable noncontrolling interests recorded as a liability on the balance sheet + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income, arising from assets, liabilities and financial instruments classified in shareholders' equity measured at fair value on a recurring basis using unobservable inputs (level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of purchases of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of settlements of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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