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Guarantees (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Commitments and Contingencies Disclosure [Abstract] |  |
Parent company guarantees on lease obligations | $ 580.4ipg_GuaranteeObligationsCurrentCarryingValueLeases | $ 588.1ipg_GuaranteeObligationsCurrentCarryingValueLeases
Parent company guarantees relating to credit facilities | 329.2ipg_GuaranteeObligationsCurrentCarryingValueCreditfacilities | 279.6ipg_GuaranteeObligationsCurrentCarryingValueCreditfacilities
Assets pledged as security for parent company guarantees | $ 0ipg_AssetsPledgedAsSecurityForParentCompanyGuarantees |

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
- Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration