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Other (Expense) Income, Net (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
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.