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Debt and Credit Agreements Narrative (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Debt Instrument [Line Items] |  |  |
Unamortized Debt Issuance Expense | $ 16.6us-gaap_UnamortizedDebtIssuanceExpense | $ 15.4us-gaap_UnamortizedDebtIssuanceExpense |
Proceeds from Issuance of Long-term Debt | 499.1us-gaap_ProceedsFromIssuanceOfLongTermDebt | 0us-gaap_ProceedsFromIssuanceOfLongTermDebt | 1,044.6us-gaap_ProceedsFromIssuanceOfLongTermDebt
Long-term Debt, Gross | 1,625.6us-gaap_DebtInstrumentCarryingAmount | 1,483.4us-gaap_DebtInstrumentCarryingAmount |
4.20% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from Issuance of Long-term Debt | 494.7us-gaap_ProceedsFromIssuanceOfLongTermDebt / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.20NotesMember |  |
Repurchase Price Percentage Due to Change of Control | 101.00%ipg_RepurchasePricePercentageDueToChangeOfControl / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.20NotesMember |  |
Debt Issuance Cost | 0.9us-gaap_DebtIssuanceCosts / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.20NotesMember |  |
Fees and Commissions | 4.4us-gaap_FeesAndCommissions / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.20NotesMember |  |
Interest Rate, Stated Percentage | 4.20%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.20NotesMember |  |
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, Face Amount | 500.0us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt4.20NotesMember |  |
6.25% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate, Stated Percentage | 6.25%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt6.25NoteMember |  |
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, Face Amount | 350.0us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt6.25NoteMember |  |
3.75% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate, Stated Percentage | 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt3.75NoteMember |  |
Long-term Debt, Gross | 498.8us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt3.75NoteMember | 498.6us-gaap_DebtInstrumentCarryingAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt3.75NoteMember |
10.00% Notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest Rate, Stated Percentage |  | 10.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt10.0NoteMember |
Debt Instrument, Face Amount |  | $ 600.0us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt10.0NoteMember |
Uncommitted credit facility |  |  |
Debt Instrument [Line Items] |  |  |
Line of Credit Facility Weighted Average Interest Rate | 4.50%ipg_LineofCreditFacilityWeightedAverageInterestRate / us-gaap_LineOfCreditFacilityAxis = ipg_UncommittedCreditFacilityMember | 4.50%ipg_LineofCreditFacilityWeightedAverageInterestRate / us-gaap_LineOfCreditFacilityAxis = ipg_UncommittedCreditFacilityMember |

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- Definition Weighted average interest rate of borrowings outstanding under the credit facility. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Repurchase price of notes as a percent of the principal amount, plus accrued and unpaid interest of the debt, if there is a change of control as specified in the applicable notes' indenture. + References No definition available. + Details
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- 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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Balance Type: | credit
Period Type: | instant

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- 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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Balance Type: | credit
Period Type: | instant

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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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- Details
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- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of fees and commissions from financial services and banking activities and correspondent clearing. Includes fees from depositor accounts, credit cards, merchant discounts, and fiduciary and trust activities, guarantee fees, investment advisory, management, and administrative fees, transfer agent fees, and insurance commissions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 9 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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Balance Type: | debit
Period Type: | duration

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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + 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 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Balance Type: |
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- Details
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