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Redeemable Noncontrolling Interests (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Redeemable Noncontrolling Interests      
Balance at beginning of period $ 249.1us-gaap_RedeemableNoncontrollingInterestEquityFairValue $ 227.2us-gaap_RedeemableNoncontrollingInterestEquityFairValue $ 243.4us-gaap_RedeemableNoncontrollingInterestEquityFairValue
Change in related noncontrolling interest balance 3.2ipg_NoncontrollingInterestRelatedToRedeemableNoncontrollingInterests 4.6ipg_NoncontrollingInterestRelatedToRedeemableNoncontrollingInterests 1.1ipg_NoncontrollingInterestRelatedToRedeemableNoncontrollingInterests
Changes in redemption value of redeemable noncontrolling interests:      
Additions 18.7ipg_RedeemableNoncontrollingInterestsPeriodIncrease 16.2ipg_RedeemableNoncontrollingInterestsPeriodIncrease 0ipg_RedeemableNoncontrollingInterestsPeriodIncrease
Redemptions and reclassifications (7.9)us-gaap_MinorityInterestDecreaseFromRedemptions (2.3)us-gaap_MinorityInterestDecreaseFromRedemptions (14.2)us-gaap_MinorityInterestDecreaseFromRedemptions
Redemption value adjustments (5.7)ipg_RedeemableNoncontrollingInterestRedemptionValueAdjustmentsIncludingForeignCurrencyTranslation 3.4ipg_RedeemableNoncontrollingInterestRedemptionValueAdjustmentsIncludingForeignCurrencyTranslation (3.1)ipg_RedeemableNoncontrollingInterestRedemptionValueAdjustmentsIncludingForeignCurrencyTranslation
Balance at end of period $ 257.4us-gaap_RedeemableNoncontrollingInterestEquityFairValue $ 249.1us-gaap_RedeemableNoncontrollingInterestEquityFairValue $ 227.2us-gaap_RedeemableNoncontrollingInterestEquityFairValue