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2004 Restatement Liabilities (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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2004 Restatement Liabilities [Abstract] |  |
Vendor discounts and credit liabilities | $ 25.5 | $ 26.9

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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