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Earnings Per Share Narrative (Details) | 3 Months Ended
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Sep. 30, 2016
Earnings Per Share [Abstract] |
Increase in shares in the effect of dilutive securities due to adoption of new guidance ASU 2016-09 | 1.6

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- 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
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Namespace Prefix: | ipg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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