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v2.4.1.9

Reconciliation of Effective Income Tax Rate (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. federal statutory income tax rate |  |  |  |  |  |  |  |  |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |  | 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate |
Income tax provision at U.S. federal statutory rate |  |  |  |  |  |  |  |  |  | $ 252.3us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |  | $ 163.8us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |  | $ 236.2us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate |
State and local income taxes, net of federal income tax benefit |  |  |  |  |  |  |  |  |  | 21.4us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes |  | 6.5us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes |  | 27.3us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes |
Impact of foreign operations, including withholding taxes |  |  |  |  |  |  |  |  |  | 1.7us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |  | 30.5us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |  | 8.4us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  |  |  |  |  |  |  |  |  | (66.0)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | [1] | 3.2us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | [1] | (57.3)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance | [1]
Worthless securities deduction |  |  |  |  |  |  |  |  |  | 0us-gaap_IncomeTaxReconciliationDeductionsOther |  | (22.2)us-gaap_IncomeTaxReconciliationDeductionsOther |  | 0us-gaap_IncomeTaxReconciliationDeductionsOther |
Increases in unrecognized tax benefits, net |  |  |  |  |  |  |  |  |  | 5.2us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease |  | 0us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease |  | 24.1us-gaap_UnrecognizedTaxBenefitsPeriodIncreaseDecrease |
Other |  |  |  |  |  |  |  |  |  | 1.9us-gaap_IncomeTaxReconciliationOtherAdjustments |  | (0.6)us-gaap_IncomeTaxReconciliationOtherAdjustments |  | (25.4)us-gaap_IncomeTaxReconciliationOtherAdjustments |
Total provision for income taxes | 87.9us-gaap_IncomeTaxExpenseBenefit | [2] | 65.0us-gaap_IncomeTaxExpenseBenefit | 65.3us-gaap_IncomeTaxExpenseBenefit | (1.7)us-gaap_IncomeTaxExpenseBenefit | 103.2us-gaap_IncomeTaxExpenseBenefit | 28.4us-gaap_IncomeTaxExpenseBenefit | 62.0us-gaap_IncomeTaxExpenseBenefit | (12.4)us-gaap_IncomeTaxExpenseBenefit | 216.5us-gaap_IncomeTaxExpenseBenefit |  | 181.2us-gaap_IncomeTaxExpenseBenefit |  | 213.3us-gaap_IncomeTaxExpenseBenefit |
Effective income tax rate on operations |  |  |  |  |  |  |  |  |  | 30.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations |  | 38.70%us-gaap_EffectiveIncomeTaxRateContinuingOperations |  | 31.60%us-gaap_EffectiveIncomeTaxRateContinuingOperations |
One hundred percent valuation allowance |  |  |  |  |  |  |  |  |  | 100.00%ipg_OneHundredPercentValuationAllowance |  | 100.00%ipg_OneHundredPercentValuationAllowance |  | 100.00%ipg_OneHundredPercentValuationAllowance |
Asia Pacific |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reversal of valuation allowance |  |  |  |  |  |  |  |  |  |  |  |  |  | 26.2ipg_ReversalOfValuationAllowance / us-gaap_ValuationAllowancesAndReservesTypeAxis = us-gaap_AsiaPacificMember |
Continental Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reversal of valuation allowance |  |  |  |  |  |  |  |  |  | 124.8ipg_ReversalOfValuationAllowance / us-gaap_ValuationAllowancesAndReservesTypeAxis = ipg_ContinentalEuropeMember |  |  |  | 21.8ipg_ReversalOfValuationAllowance / us-gaap_ValuationAllowancesAndReservesTypeAxis = ipg_ContinentalEuropeMember |
Valuation allowance established |  |  |  |  |  |  |  |  |  | 57.2ipg_Valuationallowanceestablished / us-gaap_ValuationAllowancesAndReservesTypeAxis = ipg_ContinentalEuropeMember |  |  |  |  |
Tax Contingency for the years 2007 - 2010 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation Allowances and Reserves, Charged to Cost and Expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19.5ipg_AdjustmenttoValuationAllowance / us-gaap_ValuationAllowancesAndReservesTypeAxis = ipg_TaxContingencyfortheyears20072010Member |
[1] | Reflects changes in valuation allowance that impacted the effective income tax rate for each year presented.
[2] | The three months ended December 31, 2014 included a tax benefit of $67.6 due to the net reversal of valuation allowances on deferred tax assets in Continental Europe.

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