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Contingent Acquisition Obligations (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014
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Deferred acquisition payments |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Recorded Unconditional Purchase Obligation Due in Next Twelve Months | $ 60.3us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear / ipg_ContingentAcquisitionObligationsAxis = ipg_DeferredAcquisitionPaymentsMember |
Recorded Unconditional Purchase Obligation Due in Second Year | 21.3us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear / ipg_ContingentAcquisitionObligationsAxis = ipg_DeferredAcquisitionPaymentsMember |
Recorded Unconditional Purchase Obligation Due in Third Year | 49.1us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear / ipg_ContingentAcquisitionObligationsAxis = ipg_DeferredAcquisitionPaymentsMember |
Recorded Unconditional Purchase Obligation Due in Fourth Year | 7.9us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_DeferredAcquisitionPaymentsMember |
Recorded Unconditional Purchase Obligation Due in Fifth Year | 10.8us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_DeferredAcquisitionPaymentsMember |
Recorded Unconditional Purchase Obligation Due after Fifth Year | 0.9us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_DeferredAcquisitionPaymentsMember |
Recorded Unconditional Purchase Obligation | 150.3us-gaap_RecordedUnconditionalPurchaseObligation / ipg_ContingentAcquisitionObligationsAxis = ipg_DeferredAcquisitionPaymentsMember |
Redeemable noncontrolling interests and call options with affiliates |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Recorded Unconditional Purchase Obligation Due in Next Twelve Months | 35.4us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear / ipg_ContingentAcquisitionObligationsAxis = ipg_RedeemableNoncontrollingInterestsAndCallOptionsWithAffiliatesMember |
Recorded Unconditional Purchase Obligation Due in Second Year | 65.0us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear / ipg_ContingentAcquisitionObligationsAxis = ipg_RedeemableNoncontrollingInterestsAndCallOptionsWithAffiliatesMember |
Recorded Unconditional Purchase Obligation Due in Third Year | 37.0us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear / ipg_ContingentAcquisitionObligationsAxis = ipg_RedeemableNoncontrollingInterestsAndCallOptionsWithAffiliatesMember |
Recorded Unconditional Purchase Obligation Due in Fourth Year | 7.8us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_RedeemableNoncontrollingInterestsAndCallOptionsWithAffiliatesMember |
Recorded Unconditional Purchase Obligation Due in Fifth Year | 10.5us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_RedeemableNoncontrollingInterestsAndCallOptionsWithAffiliatesMember |
Recorded Unconditional Purchase Obligation Due after Fifth Year | 7.0us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_RedeemableNoncontrollingInterestsAndCallOptionsWithAffiliatesMember |
Recorded Unconditional Purchase Obligation | 162.7us-gaap_RecordedUnconditionalPurchaseObligation / ipg_ContingentAcquisitionObligationsAxis = ipg_RedeemableNoncontrollingInterestsAndCallOptionsWithAffiliatesMember | [1]
Redeemable at noncontrolling equity owners discretion |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Recorded Unconditional Purchase Obligation Due in Next Twelve Months | 20.5us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear / ipg_ContingentAcquisitionObligationsAxis = ipg_RedeemableAtNoncontrollingEquityOwnersDiscretionMember |
Total contingent acquisition payments |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Recorded Unconditional Purchase Obligation Due in Next Twelve Months | 95.7us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear / ipg_ContingentAcquisitionObligationsAxis = ipg_TotalContingentAcquisitionPaymentsMember |
Recorded Unconditional Purchase Obligation Due in Second Year | 86.3us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear / ipg_ContingentAcquisitionObligationsAxis = ipg_TotalContingentAcquisitionPaymentsMember |
Recorded Unconditional Purchase Obligation Due in Third Year | 86.1us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear / ipg_ContingentAcquisitionObligationsAxis = ipg_TotalContingentAcquisitionPaymentsMember |
Recorded Unconditional Purchase Obligation Due in Fourth Year | 15.7us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_TotalContingentAcquisitionPaymentsMember |
Recorded Unconditional Purchase Obligation Due in Fifth Year | 21.3us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_TotalContingentAcquisitionPaymentsMember |
Recorded Unconditional Purchase Obligation Due after Fifth Year | 7.9us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_TotalContingentAcquisitionPaymentsMember |
Recorded Unconditional Purchase Obligation | 313.0us-gaap_RecordedUnconditionalPurchaseObligation / ipg_ContingentAcquisitionObligationsAxis = ipg_TotalContingentAcquisitionPaymentsMember |
Cash compensation expense included in contingent acquisitions |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Recorded Unconditional Purchase Obligation Due in Next Twelve Months | 1.9us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear / ipg_ContingentAcquisitionObligationsAxis = ipg_CashCompensationExpenseIncludedInContingentAcquisitionsMember |
Recorded Unconditional Purchase Obligation Due in Second Year | 1.6us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear / ipg_ContingentAcquisitionObligationsAxis = ipg_CashCompensationExpenseIncludedInContingentAcquisitionsMember |
Recorded Unconditional Purchase Obligation Due in Third Year | 0.7us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear / ipg_ContingentAcquisitionObligationsAxis = ipg_CashCompensationExpenseIncludedInContingentAcquisitionsMember |
Recorded Unconditional Purchase Obligation Due in Fourth Year | 0us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_CashCompensationExpenseIncludedInContingentAcquisitionsMember |
Recorded Unconditional Purchase Obligation Due in Fifth Year | 0us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_CashCompensationExpenseIncludedInContingentAcquisitionsMember |
Recorded Unconditional Purchase Obligation Due after Fifth Year | 0us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_CashCompensationExpenseIncludedInContingentAcquisitionsMember |
Recorded Unconditional Purchase Obligation | 4.2us-gaap_RecordedUnconditionalPurchaseObligation / ipg_ContingentAcquisitionObligationsAxis = ipg_CashCompensationExpenseIncludedInContingentAcquisitionsMember |
Total contingent acquisition payments excluding compensation expense |  |
Business Acquisition, Contingent Consideration [Line Items] |  |
Recorded Unconditional Purchase Obligation Due in Next Twelve Months | 93.8us-gaap_RecordedUnconditionalPurchaseObligationDueWithinOneYear / ipg_ContingentAcquisitionObligationsAxis = ipg_TotalContingentAcquisitionPaymentsExcludingCompensationExpenseMember |
Recorded Unconditional Purchase Obligation Due in Second Year | 84.7us-gaap_RecordedUnconditionalPurchaseObligationDueInSecondYear / ipg_ContingentAcquisitionObligationsAxis = ipg_TotalContingentAcquisitionPaymentsExcludingCompensationExpenseMember |
Recorded Unconditional Purchase Obligation Due in Third Year | 85.4us-gaap_RecordedUnconditionalPurchaseObligationDueInThirdYear / ipg_ContingentAcquisitionObligationsAxis = ipg_TotalContingentAcquisitionPaymentsExcludingCompensationExpenseMember |
Recorded Unconditional Purchase Obligation Due in Fourth Year | 15.7us-gaap_RecordedUnconditionalPurchaseObligationDueInFourthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_TotalContingentAcquisitionPaymentsExcludingCompensationExpenseMember |
Recorded Unconditional Purchase Obligation Due in Fifth Year | 21.3us-gaap_RecordedUnconditionalPurchaseObligationDueInFifthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_TotalContingentAcquisitionPaymentsExcludingCompensationExpenseMember |
Recorded Unconditional Purchase Obligation Due after Fifth Year | 7.9us-gaap_RecordedUnconditionalPurchaseObligationDueAfterFifthYear / ipg_ContingentAcquisitionObligationsAxis = ipg_TotalContingentAcquisitionPaymentsExcludingCompensationExpenseMember |
Recorded Unconditional Purchase Obligation | $ 308.8us-gaap_RecordedUnconditionalPurchaseObligation / ipg_ContingentAcquisitionObligationsAxis = ipg_TotalContingentAcquisitionPaymentsExcludingCompensationExpenseMember |
[1] | We have entered into certain acquisitions that contain both redeemable noncontrolling interests and call options with similar terms and conditions. The estimated amounts listed would be paid in the event of exercise at the earliest exercise date. We have certain redeemable noncontrolling interests that are exercisable at the discretion of the noncontrolling equity owners as of December 31, 2014. These estimated payments of $20.5 are included within the total payments expected to be made in 2015, and will continue to be carried forward into 2016 or beyond until exercised or expired. Redeemable noncontrolling interests are included in the table at current exercise price payable in cash, not at applicable redemption value in accordance with the authoritative guidance for classification and measurement of redeemable securities.

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- Definition Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308 + Details
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- Definition Amount of the recorded unconditional purchase obligation maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308 + Details
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- Definition Amount of the recorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308 + Details
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- Definition Amount of the recorded unconditional purchase obligation maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308 + Details
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- Definition Amount of the recorded unconditional purchase obligation maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308 + Details
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- Definition Amount of the recorded unconditional purchase obligation maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308 + Details
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- Definition Amount of the recorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6394976&loc=d3e25383-109308 + Details
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