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Incentive Compensation Plans Plan Information (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2022 USD ($)
Share-Based Payment Arrangement [Abstract] |
Performance cash awards granted during the period target value | $ 45.7
Restricted cash awards granted during the period target value | $ 14.8
Performance based cash award vesting period | 3 years
Restricted cash awards vesting period floor | 2 years
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 Performance cash award vesting period + References No definition available. + Details
Name: | ipg_Performancebasedcashawardvestingperiod
Namespace Prefix: | ipg_
Data Type: | xbrli:durationItemType
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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- Definition Restricted cash awards vesting period ceiling + References No definition available. + Details
Name: | ipg_Restrictedcashawardsvestingperiodceiling
Namespace Prefix: | ipg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Restricted cash awards vesting period floor + References No definition available. + Details
Name: | ipg_Restrictedcashawardsvestingperiodfloor
Namespace Prefix: | ipg_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration