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2004 Restatement Liabilities (Details) (USD $) In Millions | Sep. 30, 2011 | Dec. 31, 2010
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2004 Restatement Liabilities [Abstract] |  |
Vendor discounts and credit liabilities | $ 68.7 | $ 82.5

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- Definition 2004 Restatement Liabilities + 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. + Details
Name: | ipg_VendorDiscountsAndCreditLiabilities
Namespace Prefix: | ipg
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant