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Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2011
Capitalized Internal Use Software, Useful Life | 10 |  |
Leasehold improvements, useful life | the shorter of the useful life or the remaining lease term |  |
Number of Reporting Units for Purposes of Annual Goodwill Impairment Test | 13ipg_NumberOfReportingUnitsForPurposesOfAnnualGoodwillImpairmentTest |  |
Foreign currency transaction pre-tax loss | $ 1.4us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | $ 0.6us-gaap_ForeignCurrencyTransactionGainLossBeforeTax | $ 1.2us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Minimum |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Buildings, useful life | 10 years |  |
Internal Use Software, Useful Life | 3 |  |
Finite-Lived Intangible Asset, Useful Life | 7 years |  |
Maximum |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |
Buildings, useful life | 35 years |  |
Internal Use Software, Useful Life | 7 |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |

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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30690-110894 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6450189&loc=d3e30700-110894 + Details
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- Definition Disclosure of accounting policy for costs incurred when both (1) the software is acquired, internally developed, or modified solely to meet the entity's internal needs, and (2) during the software's development or modification, no substantive plan exists or is being developed to market the software externally. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 50 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=16397303&loc=d3e19379-109286 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 40 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6389767&loc=d3e17916-109280 + Details
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