XML 105 R60.htm IDEA: XBRL DOCUMENT v2.4.1.9
Debt and Credit Agreements Long term debt (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term Debt, Gross $ 1,625.6us-gaap_DebtInstrumentCarryingAmount $ 1,483.4us-gaap_DebtInstrumentCarryingAmount
Long-term Debt, Current Maturities 2.1us-gaap_LongTermDebtCurrent [1] 353.6us-gaap_LongTermDebtCurrent [1]
Long-term Debt, Excluding Current Maturities 1,623.5us-gaap_LongTermDebtNoncurrent 1,129.8us-gaap_LongTermDebtNoncurrent
6.25% Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt6.25NoteMember		 351.3us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt6.25NoteMember
Debt Instrument, Unamortized Discount 0us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt6.25NoteMember		  
Debt Instrument, Face Amount 350.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt6.25NoteMember		  
Debt Instrument, Maturity Date Nov. 15, 2014  
Interest Rate, Stated Percentage 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt6.25NoteMember		  
Debt Instrument, Fair Value Disclosure 0us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt6.25NoteMember		 [2] 365.6us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt6.25NoteMember
Debt Instrument, Interest Rate, Effective Percentage   6.29%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt6.25NoteMember
2.25% Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross 299.6us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt2.25NoteMember		 299.4us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt2.25NoteMember
Debt Instrument, Unamortized Discount 0.4us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt2.25NoteMember		  
Debt Instrument, Maturity Date Nov. 15, 2017  
Interest Rate, Stated Percentage 2.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt2.25NoteMember		  
Debt Instrument, Fair Value Disclosure 301.2us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt2.25NoteMember		 [2] 293.0us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt2.25NoteMember
Debt Instrument, Interest Rate, Effective Percentage 2.30%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt2.25NoteMember		  
4.00% Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross 247.7us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.00NoteMember		 247.4us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.00NoteMember
Debt Instrument, Unamortized Discount 2.3us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.00NoteMember		  
Debt Instrument, Maturity Date Mar. 15, 2022  
Interest Rate, Stated Percentage 4.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.00NoteMember		  
Debt Instrument, Fair Value Disclosure 255.2us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.00NoteMember		 [2] 241.6us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.00NoteMember
Debt Instrument, Interest Rate, Effective Percentage 4.13%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.00NoteMember		  
3.75% Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross 498.8us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt3.75NoteMember		 498.6us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt3.75NoteMember
Debt Instrument, Unamortized Discount 1.2us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt3.75NoteMember		  
Debt Instrument, Maturity Date Feb. 15, 2023  
Interest Rate, Stated Percentage 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt3.75NoteMember		  
Debt Instrument, Fair Value Disclosure 499.8us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt3.75NoteMember		 [2] 467.3us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt3.75NoteMember
Debt Instrument, Interest Rate, Effective Percentage 4.32%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt3.75NoteMember		  
4.25% Convertible Senior Notes    
Debt Instrument [Line Items]    
Interest Rate, Stated Percentage   4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
4.20% Notes    
Debt Instrument [Line Items]    
Long-term Debt, Gross 499.1us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember		 0us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember
Debt Instrument, Unamortized Discount 0.9us-gaap_DebtInstrumentUnamortizedDiscount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember		  
Debt Instrument, Face Amount 500.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember		  
Debt Instrument, Maturity Date Apr. 15, 2024  
Interest Rate, Stated Percentage 4.20%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember		  
Debt Instrument, Fair Value Disclosure 509.8us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember		 [2] 0us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember
Debt Instrument, Interest Rate, Effective Percentage 4.24%us-gaap_DebtInstrumentInterestRateEffectivePercentage
/ us-gaap_LongtermDebtTypeAxis
= ipg_UnsecuredDebt4.20NotesMember		  
Notes Payable, Other Payables [Member]    
Debt Instrument [Line Items]    
Long-term Debt, Gross 80.4us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember		 86.7us-gaap_DebtInstrumentCarryingAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
Debt Instrument, Fair Value Disclosure $ 80.4us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember		 [2] $ 87.8us-gaap_DebtInstrumentFairValue
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableOtherPayablesMember
[1] We included our 6.25% Senior Unsecured Notes due 2014 (the "6.25% Notes") in the current portion of long-debt on our December 31, 2013 Consolidated Balance Sheet because the 6.25% Notes were scheduled to mature on November 15, 2014. We redeemed the 6.25% Notes prior to their scheduled maturity during the second quarter of 2014.
[2] See Note 11 for information on the fair value measurement of our long-term debt.