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Commitments and Contingencies (Details) (USD $) In Millions | Sep. 30, 2011 | Dec. 31, 2010
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Commitments and Contingencies Disclosure [Abstract] |  |
Lease guarantees | $ 399.0 | $ 376.8
Credit facility guarantees | $ 323.0 | $ 395.0

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. + 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. + 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