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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Commitments and Contingencies Disclosure [Abstract] |  |
Lease guarantees | $ 538.4 ipg_GuaranteeObligationsCurrentCarryingValueLeases | $ 580.4 ipg_GuaranteeObligationsCurrentCarryingValueLeases
Credit facility guarantees | $ 325.9 ipg_GuaranteeObligationsCurrentCarryingValueCreditfacilities | $ 329.2 ipg_GuaranteeObligationsCurrentCarryingValueCreditfacilities

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- 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

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