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Incentive Compensation Plans Plan Information (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2018 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Performance cash awards granted during the period target value | $ 56.1
Restricted cash awards granted during the period target value | $ 20.5
Cash awards vesting period | 3 years

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- 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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- Definition Restricted Cash Plan - cash awards granted during the period target value + References No definition available. + Details
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Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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