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Supplementary Data Changes in Redemable Noncontrolling Interest (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Changes in Redeemable Noncontrolling Interest [Abstract]    
Balance at beginning of period $ 257.4us-gaap_RedeemableNoncontrollingInterestEquityFairValue $ 249.1us-gaap_RedeemableNoncontrollingInterestEquityFairValue
Change in related noncontrolling interests balance (2.1)ipg_NoncontrollingInterestRelatedToRedeemableNoncontrollingInterests (4.5)ipg_NoncontrollingInterestRelatedToRedeemableNoncontrollingInterests
Redeemable noncontrolling interests period increase 0ipg_RedeemableNoncontrollingInterestsPeriodIncrease 7.9ipg_RedeemableNoncontrollingInterestsPeriodIncrease
Changes in redemption value of redeemable noncontrolling interests [Abstract]    
Redemptions and other (15.7)us-gaap_MinorityInterestDecreaseFromRedemptions (1.9)us-gaap_MinorityInterestDecreaseFromRedemptions
Redemption value adjustments 3.2ipg_RedeemableNoncontrollingInterestRedemptionValueAdjustmentsIncludingForeignCurrencyTranslation [1] (0.8)ipg_RedeemableNoncontrollingInterestRedemptionValueAdjustmentsIncludingForeignCurrencyTranslation [1]
Balance at end of period $ 242.8us-gaap_RedeemableNoncontrollingInterestEquityFairValue $ 249.8us-gaap_RedeemableNoncontrollingInterestEquityFairValue
[1] 1Redeemable noncontrolling interests are reported at their estimated redemption value in each reporting period but not less than their initial fair value. Any adjustment to the redemption value impacts retained earnings or additional paid-in capital, except adjustments as a result of currency translation.