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Supplementary Data Changes in Redemable Noncontrolling Interest (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Changes in Redeemable Noncontrolling Interest [Abstract] |  |  |  |
Balance at beginning of period | $ 257.4 us-gaap_RedeemableNoncontrollingInterestEquityFairValue |  | $ 249.1 us-gaap_RedeemableNoncontrollingInterestEquityFairValue |
Change in related noncontrolling interests balance | (2.1)ipg_NoncontrollingInterestRelatedToRedeemableNoncontrollingInterests |  | (4.5)ipg_NoncontrollingInterestRelatedToRedeemableNoncontrollingInterests |
Redeemable noncontrolling interests period increase | 0 ipg_RedeemableNoncontrollingInterestsPeriodIncrease |  | 7.9 ipg_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 | 3.2 ipg_RedeemableNoncontrollingInterestRedemptionValueAdjustmentsIncludingForeignCurrencyTranslation | [1] | (0.8)ipg_RedeemableNoncontrollingInterestRedemptionValueAdjustmentsIncludingForeignCurrencyTranslation | [1]
Balance at end of period | $ 242.8 us-gaap_RedeemableNoncontrollingInterestEquityFairValue |  | $ 249.8 us-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.

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- Definition Change in noncontrolling interest balance related to redeemable noncontrolling interests + References No definition available. + Details
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- Definition Change in redeemable noncontrolling interest due to redemption value adjustments including foreign currency translation + References No definition available. + Details
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- Definition Redeemable noncontrolling interests period increase + References No definition available. + Details
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- Definition Decrease in noncontrolling interest (for example, but not limited to, redeeming or purchasing the interests of noncontrolling shareholders, issuance of shares (interests) by the non-wholly owned subsidiary to the parent entity for other than cash, and a buyback of shares (interest) by the non-wholly owned subsidiary from the noncontrolling interests). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569655-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4616395-111683 + Details
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- Definition The aggregate fair value as of the reporting date of all noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. This item includes noncontrolling interest holder's ownership (or holders' ownership) regardless of the type of equity interest (common, preferred, other) including all potential organizational (legal) forms of the investee entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=27011957&loc=SL6540498-122764 + Details
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