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Debt and Credit Agreements Cash Pooling (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Debt Disclosure [Abstract] |  |
Cash debt pooling arrangements, amount netted | $ 2,065.8 | $ 1,412.0

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- Definition Cash debt pooling arrangements, amount netted + References No definition available. + Details
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Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration