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Commitments and Contingencies (Details) - USD ($) | Jun. 30, 2021 | Dec. 31, 2020
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Commitments and Contingencies Disclosure [Abstract] |  |
Lease guarantees | $ 600,600,000 | $ 630,800,000
Credit facility guarantees | 434,600,000 | 399,600,000
Cash pooling guarantees | 107,300,000 | $ 109,200,000
Assets pledged as security for parent company guarantees | $ 0 |

X
- Definition Assets pledged as security for parent company guarantees + References No definition available. + Details
Name: | ipg_AssetsPledgedAsSecurityForParentCompanyGuarantees
Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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