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Debt and Credit Agreements Cash Pooling (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Cash debt pooling arrangements, amount netted	$ 2,702.2	$ 2,274.9

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- Definition

Cash debt pooling arrangements, amount netted

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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