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Guarantees (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
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Commitments and Contingencies Disclosure [Abstract] |  |
Parent company guarantees on lease obligations | $ 857.3 | $ 619.4
Parent company guarantees relating to credit facilities | 395.6 | $ 336.5
Assets pledged as security for parent company guarantees | $ 0.0 |

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 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