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Debt and Credit Arrangements Term Loan Agreement (Details) - USD ($) $ in Millions | 3 Months Ended
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Sep. 30, 2019 | Jun. 30, 2019
Term Loan Agreement [Abstract] |  |
Repayments of Debt | $ 200.0 | $ 100.0

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- Definition Term Loan Agreement [Abstract] + References No definition available. + Details
Name: | ipg_TermLoanAgreementAbstract
Namespace Prefix: | ipg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration