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Earnings Per Share Narrative (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2016
Earnings Per Share [Abstract] |  |
Increase in shares in the effect of dilutive securities due to adoption of new guidance | 1.8 | 1.5

X
- Definition Additional shares included in the calculation of diluted EPS as a result of adopting Accounting Standards Update 2016-09 + References No definition available. + Details
Name: | ipg_IncrementalCommonSharesAttributabletoDilutiveEffectofShareBasedPaymentArrangementsduetoAdoptionofNewGuidance
Namespace Prefix: | ipg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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