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Incentive Compensation Plans Plan Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Incentive Compensation Plan Initiation Year | 2014
Performance Cash awards granted during the period target value | $ 0.4 ipg_CashAwardsGrantedDuringPeriodTargetValue
Restricted Cash Plan cash awards granted during the period target value | $ 32.0 ipg_RestrictedCashPlancashawardsgrantedduringtheperiodtargetvalue
Cash awards vesting period | 3 years

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- Definition Target value of all cash awards granted during the period (settled in shares or cash) + References No definition available. + Details
Name: | ipg_CashAwardsGrantedDuringPeriodTargetValue
Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Incentive Compensation Plan Initiation Year + References No definition available. + Details
Name: | ipg_IncentiveCompensationPlanInitiationYear
Namespace Prefix: | ipg_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

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- Definition Restricted Cash Plan - cash awards granted during the period target value + References No definition available. + Details
Name: | ipg_RestrictedCashPlancashawardsgrantedduringtheperiodtargetvalue
Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration