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2004 Restatement Liabilities (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
2004 Restatement Liabilities [Abstract]
Vendor discounts and credit liabilities	$ 33.1	$ 55.5

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- Details

Name:	ipg_A2004RestatementLiabilitiesAbstract
Namespace Prefix:	ipg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Liabilities related to vendor discounts and credits where we have a contractual or legal obligation to rebate to clients or vendors.

+ References

No definition available.

+ Details

Name:	ipg_VendorDiscountsAndCreditLiabilities
Namespace Prefix:	ipg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant