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Incentive Compensation Plans Plan Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Performance cash awards granted during the period target value	$ 40.7
Restricted cash awards granted during the period target value	$ 4.6
Cash awards vesting period	3 years

X

- Definition

Target value of all cash awards granted during the period (settled in shares or cash)

+ References

No definition available.

+ Details

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Namespace Prefix:	ipg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Restricted Cash Plan - cash awards granted during the period target value

+ References

No definition available.

+ Details

Name:	ipg_RestrictedCashPlancashawardsgrantedduringtheperiodtargetvalue
Namespace Prefix:	ipg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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Balance Type:	na
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