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v2.4.1.9

Results by Quarter (Unaudited) (Details) (USD $) In Millions, except Per Share data, 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
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 2,207.1us-gaap_Revenues |  | $ 1,841.1us-gaap_Revenues | $ 1,851.4us-gaap_Revenues |  | $ 1,637.5us-gaap_Revenues | $ 2,122.7us-gaap_Revenues | $ 1,700.4us-gaap_Revenues |  | $ 1,756.2us-gaap_Revenues | $ 1,543.0us-gaap_Revenues | $ 7,537.1us-gaap_Revenues | $ 7,122.3us-gaap_Revenues | $ 6,956.2us-gaap_Revenues
Salaries and related expenses | 1,266.4us-gaap_LaborAndRelatedExpense |  | 1,195.2us-gaap_LaborAndRelatedExpense | 1,170.2us-gaap_LaborAndRelatedExpense |  | 1,188.6us-gaap_LaborAndRelatedExpense | 1,199.6us-gaap_LaborAndRelatedExpense | 1,093.6us-gaap_LaborAndRelatedExpense |  | 1,120.2us-gaap_LaborAndRelatedExpense | 1,132.1us-gaap_LaborAndRelatedExpense | 4,820.4us-gaap_LaborAndRelatedExpense | 4,545.5us-gaap_LaborAndRelatedExpense | 4,391.9us-gaap_LaborAndRelatedExpense
Office and general expenses | 507.6us-gaap_GeneralAndAdministrativeExpense |  | 474.7us-gaap_GeneralAndAdministrativeExpense | 484.7us-gaap_GeneralAndAdministrativeExpense |  | 461.1us-gaap_GeneralAndAdministrativeExpense | 538.1us-gaap_GeneralAndAdministrativeExpense | 465.5us-gaap_GeneralAndAdministrativeExpense |  | 460.9us-gaap_GeneralAndAdministrativeExpense | 453.4us-gaap_GeneralAndAdministrativeExpense | 1,928.1us-gaap_GeneralAndAdministrativeExpense | 1,917.9us-gaap_GeneralAndAdministrativeExpense | 1,887.2us-gaap_GeneralAndAdministrativeExpense
Restructuring and other reorganization-related charges (reversals), net | 0.1us-gaap_RestructuringCharges |  | (0.1)us-gaap_RestructuringCharges | 0.7us-gaap_RestructuringCharges |  | (0.5)us-gaap_RestructuringCharges | 60.6us-gaap_RestructuringCharges | (0.2)us-gaap_RestructuringCharges |  | 0.3us-gaap_RestructuringCharges | (0.1)us-gaap_RestructuringCharges | 0.2us-gaap_RestructuringCharges | 60.6us-gaap_RestructuringCharges | (1.2)us-gaap_RestructuringCharges
Operating (loss) income | 433.0us-gaap_OperatingIncomeLoss |  | 171.3us-gaap_OperatingIncomeLoss | 195.8us-gaap_OperatingIncomeLoss |  | (11.7)us-gaap_OperatingIncomeLoss | 324.4us-gaap_OperatingIncomeLoss | 141.5us-gaap_OperatingIncomeLoss |  | 174.8us-gaap_OperatingIncomeLoss | (42.4)us-gaap_OperatingIncomeLoss | (788.4)us-gaap_OperatingIncomeLoss | (598.3)us-gaap_OperatingIncomeLoss | (678.3)us-gaap_OperatingIncomeLoss
Other income (expense), net 1 | (0.1)us-gaap_OtherNonoperatingIncomeExpense |  | (0.6)us-gaap_OtherNonoperatingIncomeExpense | (11.2)us-gaap_OtherNonoperatingIncomeExpense | [1] | 1.7us-gaap_OtherNonoperatingIncomeExpense | 7.7us-gaap_OtherNonoperatingIncomeExpense | (46.6)us-gaap_OtherNonoperatingIncomeExpense | [1] | 4.8us-gaap_OtherNonoperatingIncomeExpense | 1.8us-gaap_OtherNonoperatingIncomeExpense | 10.2us-gaap_OtherNonoperatingIncomeExpense | 32.3us-gaap_OtherNonoperatingIncomeExpense | (100.5)us-gaap_OtherNonoperatingIncomeExpense
Total (expenses) and other income | (14.4)us-gaap_NonoperatingIncomeExpense |  | (13.8)us-gaap_NonoperatingIncomeExpense | (27.2)us-gaap_NonoperatingIncomeExpense | [1] | (12.3)us-gaap_NonoperatingIncomeExpense | (10.3)us-gaap_NonoperatingIncomeExpense | (64.5)us-gaap_NonoperatingIncomeExpense | [1] | (26.9)us-gaap_NonoperatingIncomeExpense | (28.6)us-gaap_NonoperatingIncomeExpense | 67.7us-gaap_NonoperatingIncomeExpense | 130.3us-gaap_NonoperatingIncomeExpense | 3.5us-gaap_NonoperatingIncomeExpense
(Benefit of) 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
Net (loss) income | (331.3)us-gaap_ProfitLoss |  | (92.8)us-gaap_ProfitLoss | (103.7)us-gaap_ProfitLoss |  | 22.4us-gaap_ProfitLoss | (212.1)us-gaap_ProfitLoss | (49.2)us-gaap_ProfitLoss |  | (86.1)us-gaap_ProfitLoss | 58.5us-gaap_ProfitLoss | (505.4)us-gaap_ProfitLoss | (288.9)us-gaap_ProfitLoss | (464.6)us-gaap_ProfitLoss
Net (loss) income available to IPG common stockholders | 308.9us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | 89.7us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 99.4us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | (20.9)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 193.1us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 45.4us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |  | 79.9us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | (59.2)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 477.1us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 259.2us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | 435.1us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Quarterly Information Tables [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  |  |  | 10.4us-gaap_GainsLossesOnExtinguishmentOfDebt | 45.2us-gaap_GainsLossesOnExtinguishmentOfDebt | 0us-gaap_GainsLossesOnExtinguishmentOfDebt
Dividends declared per common share | $ 0.095us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.095us-gaap_CommonStockDividendsPerShareDeclared | $ 0.095us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.095us-gaap_CommonStockDividendsPerShareDeclared | $ 0.075us-gaap_CommonStockDividendsPerShareDeclared | $ 0.075us-gaap_CommonStockDividendsPerShareDeclared |  | $ 0.075us-gaap_CommonStockDividendsPerShareDeclared | $ 0.075us-gaap_CommonStockDividendsPerShareDeclared | $ 0.38us-gaap_CommonStockDividendsPerShareDeclared | $ 0.30us-gaap_CommonStockDividendsPerShareDeclared | $ 0.24us-gaap_CommonStockDividendsPerShareDeclared
Basic | $ 0.75us-gaap_EarningsPerShareBasic |  | $ 0.21us-gaap_EarningsPerShareBasic | $ 0.24us-gaap_EarningsPerShareBasic |  | $ (0.05)us-gaap_EarningsPerShareBasic | $ 0.45us-gaap_EarningsPerShareBasic | $ 0.11us-gaap_EarningsPerShareBasic |  | $ 0.19us-gaap_EarningsPerShareBasic | $ (0.14)us-gaap_EarningsPerShareBasic | $ 1.14us-gaap_EarningsPerShareBasic | $ 0.62us-gaap_EarningsPerShareBasic | $ 1.01us-gaap_EarningsPerShareBasic
Diluted | $ 0.73us-gaap_EarningsPerShareDiluted |  | $ 0.21us-gaap_EarningsPerShareDiluted | $ 0.23us-gaap_EarningsPerShareDiluted |  | $ (0.05)us-gaap_EarningsPerShareDiluted | $ 0.44us-gaap_EarningsPerShareDiluted | $ 0.11us-gaap_EarningsPerShareDiluted |  | $ 0.18us-gaap_EarningsPerShareDiluted | $ (0.14)us-gaap_EarningsPerShareDiluted | $ 1.12us-gaap_EarningsPerShareDiluted | $ 0.61us-gaap_EarningsPerShareDiluted | $ 0.94us-gaap_EarningsPerShareDiluted
6.25% Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |
Quarterly Information Tables [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gains (Losses) on Extinguishment of Debt |  |  |  |  |  |  |  |  |  |  |  | $ 10.4us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt6.25NoteMember |  |
[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.
[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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