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Income Taxes Change in Valuation Allowances (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summary of Valuation Allowances |  |  |  |
Deferred Tax Assets, Valuation Allowance | $ 332.2us-gaap_DeferredTaxAssetsValuationAllowance | $ 467.3us-gaap_DeferredTaxAssetsValuationAllowance | $ 392.9us-gaap_DeferredTaxAssetsValuationAllowance | $ 489.9us-gaap_DeferredTaxAssetsValuationAllowance
(Reversed) charged to costs and expenses | (72.8)ipg_ValuationAllowanceDeferredTaxAssetChangeInAmountChargedReversedToCostsAndExpenses | 65.2ipg_ValuationAllowanceDeferredTaxAssetChangeInAmountChargedReversedToCostsAndExpenses | (49.5)ipg_ValuationAllowanceDeferredTaxAssetChangeInAmountChargedReversedToCostsAndExpenses |
(Reversed) charged to gross tax assets and other accounts | (62.3)ipg_ValuationAllowanceDeferredTaxAssetChangeInAmountChargedReversedToGrossTaxAssetsAndOtherAccounts | 9.2ipg_ValuationAllowanceDeferredTaxAssetChangeInAmountChargedReversedToGrossTaxAssetsAndOtherAccounts | (47.5)ipg_ValuationAllowanceDeferredTaxAssetChangeInAmountChargedReversedToGrossTaxAssetsAndOtherAccounts |
Operating Loss Carryforwards | 1,263.1us-gaap_OperatingLossCarryforwards |  |  |
Deferred Tax Liabilities, Undistributed Foreign Earnings | 2,214.2us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings | 1,959.8us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings |  |
Foreign Tax Authority |  |  |  |
Summary of Valuation Allowances |  |  |  |
Income Tax Examination, Year under Examination | 2006 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | 1,053.4us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration | 209.7us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember |  |  |
Domestic Tax Authority |  |  |  |
Summary of Valuation Allowances |  |  |  |
Income Tax Examination, Year under Examination | 2009 |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Not Subject to Expiration | $ 60.3us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsNotSubjectToExpiration / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember |  |  |
Minimum | Foreign Tax Authority |  |  |  |
Summary of Valuation Allowances |  |  |  |
Operating Loss Carryforwards, Expiration Date | Jan. 01, 2015 |  |  |
Minimum | Domestic Tax Authority |  |  |  |
Summary of Valuation Allowances |  |  |  |
Income Tax Examination, Year under Examination |  | 2002 |  |
Operating Loss Carryforwards, Expiration Date | Jan. 01, 2015 |  |  |
Maximum | Foreign Tax Authority |  |  |  |
Summary of Valuation Allowances |  |  |  |
Operating Loss Carryforwards, Expiration Date | Jan. 01, 2033 |  |  |
Maximum | Domestic Tax Authority |  |  |  |
Summary of Valuation Allowances |  |  |  |
Income Tax Examination, Year under Examination |  | 2006 |  |
Operating Loss Carryforwards, Expiration Date | Jan. 01, 2034 |  |  |

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