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Acquisitions Narrative (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | $ 185.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet | $ 97.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet | $ 201.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
Number of Businesses Acquired | 8us-gaap_NumberOfBusinessesAcquired | 11us-gaap_NumberOfBusinessesAcquired | 12us-gaap_NumberOfBusinessesAcquired
IAN |  |  |
Number of Businesses Acquired | 6us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 9us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember | 8us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember
CMG |  |  |
Number of Businesses Acquired | 2us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = ipg_ReportableSegmentsTwoMember | 2us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = ipg_ReportableSegmentsTwoMember | 4us-gaap_NumberOfBusinessesAcquired / us-gaap_StatementBusinessSegmentsAxis = ipg_ReportableSegmentsTwoMember

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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=35744172&loc=d3e2207-128464 + Details
Name: | us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The number of businesses acquired by the entity during the period. + References No definition available. + Details
Name: | us-gaap_NumberOfBusinessesAcquired
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ipg_ReportableSegmentsTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |