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Change in Valuation Allowance (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Valuation Allowance [Abstract] |  |  |
Balance at beginning of period | $ 392.9 | $ 489.9 | $ 508.1
(Reversed) charged to costs and expenses | 65.2 | (49.5) | (25.1)
Charged (reversed) to gross tax assets and other accounts | 9.2 | (47.5) | 6.9
Balance at end of period | $ 467.3 | $ 392.9 | $ 489.9

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- Definition The amount of the change in the period in the valuation allowance charged (reversed) to costs and expenses for a specified deferred tax asset. + References No definition available. + Details
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Namespace Prefix: | ipg_
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Balance Type: | credit
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- Definition The amount of the change in the period in the valuation allowance charged (reversed) to gross tax assets and other accounts for a specified deferred tax asset. + References No definition available. + Details
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Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration