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

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