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Income Taxes Tax Act (Details) $ in Millions	Sep. 30, 2018 USD ($)
Tax Act [Abstract]
Tax Act Impact	$ 16.7

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- Definition

Tax Act [Abstract]

+ 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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- Definition

Tax expense related to the Tax Act true-up

+ References

No definition available.

+ Details

Name:	ipg_TaxActImpact
Namespace Prefix:	ipg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant