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Other (Expense) Income, Net (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  | $ (10.4)us-gaap_GainsLossesOnExtinguishmentOfDebt | $ (45.2)us-gaap_GainsLossesOnExtinguishmentOfDebt | $ 0us-gaap_GainsLossesOnExtinguishmentOfDebt
Gains on sales of businesses and investments |  |  |  |  |  |  |  |  |  |  | 0.8us-gaap_GainLossOnSaleOfInvestments | (1.5)us-gaap_GainLossOnSaleOfInvestments | 88.2us-gaap_GainLossOnSaleOfInvestments
Vendor discounts and credit adjustments |  |  |  |  |  |  |  |  |  |  | 3.3ipg_VendorDiscountsAndCreditAdjustments | 8.6ipg_VendorDiscountsAndCreditAdjustments | 15.3ipg_VendorDiscountsAndCreditAdjustments
Other (expense) income, net |  |  |  |  |  |  |  |  |  |  | (3.9)us-gaap_OtherNonoperatingExpense | (2.8)us-gaap_OtherNonoperatingExpense | (3.0)us-gaap_OtherNonoperatingExpense
Total other (expense) income, net | 0.1us-gaap_OtherNonoperatingIncomeExpense | 0.6us-gaap_OtherNonoperatingIncomeExpense | 11.2us-gaap_OtherNonoperatingIncomeExpense | [1] | (1.7)us-gaap_OtherNonoperatingIncomeExpense | (7.7)us-gaap_OtherNonoperatingIncomeExpense | 46.6us-gaap_OtherNonoperatingIncomeExpense | [1] | (4.8)us-gaap_OtherNonoperatingIncomeExpense | (1.8)us-gaap_OtherNonoperatingIncomeExpense | (10.2)us-gaap_OtherNonoperatingIncomeExpense | (32.3)us-gaap_OtherNonoperatingIncomeExpense | 100.5us-gaap_OtherNonoperatingIncomeExpense
6.25% Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  | (10.4)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt6.25NoteMember |  |
Debt Instrument, Interest Rate, Stated Percentage | (6.25%)us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt6.25NoteMember |  |  |  |  |  |  |  |  |  | (6.25%)us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt6.25NoteMember |  |
10.00% Notes |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on early extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  | $ (45.2)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt10.0NoteMember |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | (10.00%)us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt10.0NoteMember |  |  |  |  |  | (10.00%)us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt10.0NoteMember |
[1] | The three months ended June 30, 2014 included a pre-tax loss of $10.4, related to our early extinguishment of debt. The three months ended September 30, 2013 included a pre-tax loss of $45.2, related to our early extinguishment of debt.

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- Definition Reversal of vendor discounts and credit liabilities as a result of settlement with clients or vendors or where the statue of limitations has lapsed + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The aggregate amount of other expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating expense recognized during the period. Such amounts may include: (a) unusual costs, (b) loss on foreign exchange transactions, (c) losses on securities (net of profits), and (d) miscellaneous other expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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