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Long-term Debt (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Long-term Debt $ 1,622.6us-gaap_LongTermDebt $ 1,625.6us-gaap_LongTermDebt
Less: current portion 2.0us-gaap_LongTermDebtCurrent 2.1us-gaap_LongTermDebtCurrent
Long-term Debt, Excluding Current Maturities 1,620.6us-gaap_LongTermDebtNoncurrent 1,623.5us-gaap_LongTermDebtNoncurrent
2.25% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 2.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt2.25NoteMember
 
Debt Instrument, Interest Rate, Stated Percentage 2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt2.25NoteMember
 
Debt Instrument, Maturity Date Nov. 15, 2017  
Debt Instrument, Unamortized Discount 0.4us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt2.25NoteMember
 
Long-term Debt, Gross 299.6us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt2.25NoteMember
299.6us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt2.25NoteMember
Long-term Debt, Fair Value 303.6us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt2.25NoteMember
[1] 301.2us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt2.25NoteMember
[1]
4.00% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 4.13%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.00NoteMember
 
Debt Instrument, Interest Rate, Stated Percentage 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.00NoteMember
 
Debt Instrument, Maturity Date Mar. 15, 2022  
Debt Instrument, Unamortized Discount 2.2us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.00NoteMember
 
Long-term Debt, Gross 247.8us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.00NoteMember
247.7us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.00NoteMember
Long-term Debt, Fair Value 263.2us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.00NoteMember
[1] 255.2us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.00NoteMember
[1]
3.75% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 4.32%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt3.75NoteMember
 
Debt Instrument, Interest Rate, Stated Percentage 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt3.75NoteMember
 
Debt Instrument, Maturity Date Feb. 15, 2023  
Debt Instrument, Unamortized Discount 1.2us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt3.75NoteMember
 
Long-term Debt, Gross 498.8us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt3.75NoteMember
498.8us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt3.75NoteMember
Long-term Debt, Fair Value 512.1us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt3.75NoteMember
[1] 499.8us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt3.75NoteMember
[1]
4.20% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Effective Percentage 4.24%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember
 
Debt Instrument, Interest Rate, Stated Percentage 4.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember
 
Debt Instrument, Maturity Date Apr. 15, 2024  
Debt Instrument, Unamortized Discount 0.9us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember
 
Long-term Debt, Gross 499.1us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember
499.1us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember
Long-term Debt, Fair Value 531.5us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember
[1] 509.8us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember
[1]
Other notes payable and capitalized leases    
Debt Instrument [Line Items]    
Long-term Debt, Gross 77.3us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
80.4us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Long-term Debt, Fair Value $ 77.3us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
[1] $ 80.4us-gaap_LongTermDebtFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
[1]
[1] See Note 11 for information on the fair value measurement of our long-term debt.