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v2.4.1.9

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 | $ 1,622.6 us-gaap_LongTermDebt |  | $ 1,625.6 us-gaap_LongTermDebt |
Less: current portion | 2.0 us-gaap_LongTermDebtCurrent |  | 2.1 us-gaap_LongTermDebtCurrent |
Long-term Debt, Excluding Current Maturities | 1,620.6 us-gaap_LongTermDebtNoncurrent |  | 1,623.5 us-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 | 0.4 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt2.25NoteMember |  |  |
Long-term Debt, Gross | 299.6 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt2.25NoteMember |  | 299.6 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt2.25NoteMember |
Long-term Debt, Fair Value | 303.6 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt2.25NoteMember | [1] | 301.2 us-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 | 2.2 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.00NoteMember |  |  |
Long-term Debt, Gross | 247.8 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.00NoteMember |  | 247.7 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.00NoteMember |
Long-term Debt, Fair Value | 263.2 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.00NoteMember | [1] | 255.2 us-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 | 1.2 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt3.75NoteMember |  |  |
Long-term Debt, Gross | 498.8 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt3.75NoteMember |  | 498.8 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt3.75NoteMember |
Long-term Debt, Fair Value | 512.1 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt3.75NoteMember | [1] | 499.8 us-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 | 0.9 us-gaap_DebtInstrumentUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.20NotesMember |  |  |
Long-term Debt, Gross | 499.1 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.20NotesMember |  | 499.1 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.20NotesMember |
Long-term Debt, Fair Value | 531.5 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.20NotesMember | [1] | 509.8 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.20NotesMember | [1]
Other notes payable and capitalized leases |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Gross | 77.3 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |  | 80.4 us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember |
Long-term Debt, Fair Value | $ 77.3 us-gaap_LongTermDebtFairValue / us-gaap_LongtermDebtTypeAxis = us-gaap_NotesPayableOtherPayablesMember | [1] | $ 80.4 us-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.

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
Name: | us-gaap_DebtInstrumentCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- 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
Name: | us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_DebtInstrumentMaturityDate
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 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 FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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
Name: | us-gaap_LongTermDebtCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). 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 210.5-02.22) -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 22 -Article 5 + Details
Name: | us-gaap_LongTermDebtNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LongtermDebtTypeAxis=ipg_UnsecuredDebt3.75NoteMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |