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v3.10.0.1

Subsequent Events (Details) | 3 Months Ended
--- | ---
Jun. 30, 2018 USD ($)
Subsequent Events [Abstract] |
Agreed Consideration | $ 2,300,000,000.0

X
- Definition The agreed-upon cash payment to be made for the acquisition of AMS upon satisfaction of the terms and subject to the conditions set forth in the Purchase Agreement. + References No definition available. + Details
Name: | ipg_AgreedConsideration
Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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