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Commitments and Contingencies (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Commitments and Contingencies Disclosure [Abstract] |  |
Lease guarantees | $ 851.7 | $ 829.2
Credit facility guarantees | 333.8 | 308.8
Cash pooling guarantees | $ 204.6 | $ 182.2

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- Definition Cash pooling guarantees + References No definition available. + Details
Name: | ipg_Cashpoolingguarantees
Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the credit facilities guarantees or each group of similar guarantees. + References No definition available. + Details
Name: | ipg_GuaranteeObligationsCurrentCarryingValueCreditfacilities
Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the lease guarantees. + References No definition available. + Details
Name: | ipg_GuaranteeObligationsCurrentCarryingValueLeases
Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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