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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.

X
- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611 + Details
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X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: 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 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 Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + 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)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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