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Credit Facilities (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2015 USD ($)
Debt and Credit Arrangements [Abstract] |
Line of Credit Facility, Expiration Date | Dec. 12, 2018
Line of Credit Facility, Maximum Borrowing Capacity | $ 1,000.0
Line of Credit Facility, Increase Available | 250.0
Line of Credit Facility, Letters of Credit Outstanding Sublimit | $ 200.0

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- Definition Debt and Credit Arrangements [Abstract] + References No definition available. + Details
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- Definition The amount by which the company may increase or decrease the credit facility amount. + 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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- Definition Line of Credit Facility Limits on Letters of Credit + 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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- 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
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + 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
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