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Goodwill (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Goodwill |  |  |  |  |  |
Goodwill | $ 3,669.2us-gaap_Goodwill |  | $ 3,629.0us-gaap_Goodwill |  | $ 3,580.6us-gaap_Goodwill | [1]
Current year acquisitions | 136.1us-gaap_GoodwillAcquiredDuringPeriod | [1] | 75.3us-gaap_GoodwillAcquiredDuringPeriod | [1] |  |
Foreign currency and other | (95.9)us-gaap_GoodwillOtherChanges | [1] | (26.9)us-gaap_GoodwillOtherChanges | [1] |  |
IAN |  |  |  |  |  |
Goodwill |  |  |  |  |  |
Goodwill | 3,120.8us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [1] | 3,109.3us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [1] | 3,074.6us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [1]
Current year acquisitions | 95.2us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [1] | 58.8us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [1] |  |
Foreign currency and other | (83.7)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [1] | (24.1)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_AllOtherSegmentsMember | [1] |  |
CMG |  |  |  |  |  |
Goodwill |  |  |  |  |  |
Goodwill | 548.4us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ipg_ReportableSegmentsTwoMember | [1] | 519.7us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ipg_ReportableSegmentsTwoMember | [1] | 506.0us-gaap_Goodwill / us-gaap_StatementBusinessSegmentsAxis = ipg_ReportableSegmentsTwoMember | [1]
Current year acquisitions | 40.9us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = ipg_ReportableSegmentsTwoMember | [1] | 16.5us-gaap_GoodwillAcquiredDuringPeriod / us-gaap_StatementBusinessSegmentsAxis = ipg_ReportableSegmentsTwoMember | [1] |  |
Foreign currency and other | $ (12.2)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = ipg_ReportableSegmentsTwoMember | [1] | $ (2.8)us-gaap_GoodwillOtherChanges / us-gaap_StatementBusinessSegmentsAxis = ipg_ReportableSegmentsTwoMember | [1] |  |
[1] | For all periods presented we have not recorded a goodwill impairment charge.

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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