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Subsequent Events Subsequent Events (Details) - USD ($) $ in Millions | Oct. 25, 2017 | Sep. 30, 2017
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Subsequent Event [Line Items] |  |
Commercial paper borrowing capacity | $ 1,500.0 | $ 1,000.0
Committed credit facility [Member] |  |
Subsequent Event [Line Items] |  |
Line of credit facility, current borrowing capacity | $ 1,500.0 | $ 1,000.0

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- Definition Commercial paper borrowing capacity + References No definition available. + Details
Name: | ipg_Commercialpaperborrowingcapacity
Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_LineOfCreditFacilityAxis=ipg_CommittedCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |