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Commitments and Contingencies (Details) - USD ($) | Jun. 30, 2025 | Dec. 31, 2024
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Commitments and Contingencies Disclosure [Abstract] |  |
Lease guarantees | $ 388,100,000 | $ 416,100,000
Credit facility guarantees | 245,800,000 | 256,600,000
Cash pooling guarantees | 87,400,000 | 79,600,000
Assets pledged as security for parent company guarantees | $ 0 | $ 0

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- 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