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Acquisitions Number of Acquisitions (Details) - business | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Number of acquisitions [Abstract] |  |
Number of Businesses Acquired | 1 | 3

X
- Definition Number of acquisitions [Abstract] + References No definition available. + Details
Name: | ipg_NumberofacquisitionsAbstract
Namespace Prefix: | ipg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
Name: | us-gaap_NumberOfBusinessesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration