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Debt and Credit Agreements Credit Facility (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility Commitment Increase | $ 250.0ipg_LineofCreditFacilityCommitmentIncrease |  |
Line of Credit Facility Limits on Letters of Credit | 200.0ipg_LineOfCreditFacilityLimitsOnLettersOfCredit |  |
Margin for base rate advances | 0.275%ipg_MarginForBaseRateAdvances |  |
Margin for Eurocurrency rate advances | 1.275%ipg_MarginForEurocurrencyRateAdvances |  |
Annual rate for fronting fees accrued on letters of credit | 0.25%ipg_AnnualRateForFrontingFeesAccruedOnLettersOfCredit |  |
Line of Credit Facility, Commitment Fee Percentage | 0.225%us-gaap_LineOfCreditFacilityCommitmentFeePercentage |  |
Leverage ratio maximum | 3.25x | [1] |
Interest coverage ratio minimum | 5.00x | [2] |
Cash debt pooling arrangements, amount netted | 1,590.7ipg_CashDebtPoolingArrangementsAmountNetted |  | 1,415.3ipg_CashDebtPoolingArrangementsAmountNetted
Committed credit facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Remaining Borrowing Capacity | 984.0us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = ipg_CommittedCreditFacilityMember |  | 985.7us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = ipg_CommittedCreditFacilityMember
Line of Credit Facility, Maximum Borrowing Capacity | 1,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = ipg_CommittedCreditFacilityMember |  | 1,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = ipg_CommittedCreditFacilityMember
Long-term Line of Credit | 0us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = ipg_CommittedCreditFacilityMember |  | 0us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = ipg_CommittedCreditFacilityMember
Letters of Credit Outstanding, Amount | 16.0us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LineOfCreditFacilityAxis = ipg_CommittedCreditFacilityMember |  | 14.3us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LineOfCreditFacilityAxis = ipg_CommittedCreditFacilityMember
Uncommitted credit facility |  |  |
Line of Credit Facility [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
Line of Credit Facility, Remaining Borrowing Capacity | 629.2us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = ipg_UncommittedCreditFacilityMember |  | 516.9us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = ipg_UncommittedCreditFacilityMember
Line of Credit Facility, Maximum Borrowing Capacity | 740.3us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = ipg_UncommittedCreditFacilityMember |  | 700.2us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_LineOfCreditFacilityAxis = ipg_UncommittedCreditFacilityMember
Long-term Line of Credit | 107.2us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = ipg_UncommittedCreditFacilityMember |  | 179.1us-gaap_LineOfCredit / us-gaap_LineOfCreditFacilityAxis = ipg_UncommittedCreditFacilityMember
Letters of Credit Outstanding, Amount | $ 3.9us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LineOfCreditFacilityAxis = ipg_UncommittedCreditFacilityMember |  | $ 4.2us-gaap_LettersOfCreditOutstandingAmount / us-gaap_LineOfCreditFacilityAxis = ipg_UncommittedCreditFacilityMember
[1] | The leverage ratio is defined as debt as of the last day of such fiscal quarter to EBITDA, as defined in the Credit Agreement, for the four quarters then ended.
[2] | The interest coverage ratio is defined as EBITDA, as defined in the Credit Agreement, to net interest expense

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- Definition Annual rate for fronting fees accrued on the aggregate amount of letters of credit outstanding. + References No definition available. + Details
Name: | ipg_AnnualRateForFrontingFeesAccruedOnLettersOfCredit
Namespace Prefix: | ipg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Cash debt pooling arrangements, amount netted + References No definition available. + Details
Name: | ipg_CashDebtPoolingArrangementsAmountNetted
Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Interest coverage ratio covenant in the Credit Agreement that requires that we maintain a minimum ratio of EBITDA, as defined in the Credit Agreement, to net interest expense plus cash dividends on convertible preferred stock for the four quarters then ended. + References No definition available. + Details
Name: | ipg_InterestCoverageRatioMinimum
Namespace Prefix: | ipg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Leverage ratio covenant in the Credit Agreement that requires that we maintain a maximum ratio of debt as of the last day of such fiscal quarter to EBITDA, as defined in the Credit Agreement, for the four quarters then ended. + References No definition available. + Details
Name: | ipg_LeverageRatioMaximum
Namespace Prefix: | ipg_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount that the Company is able to increase commitments subject to satisfaction of certain conditions + References No definition available. + Details
Name: | ipg_LineofCreditFacilityCommitmentIncrease
Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line of Credit Facility Limits on Letters of Credit + References No definition available. + Details
Name: | ipg_LineOfCreditFacilityLimitsOnLettersOfCredit
Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Margin for base rate advances under the Credit Agreement. + References No definition available. + Details
Name: | ipg_MarginForBaseRateAdvances
Namespace Prefix: | ipg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Margin for Eurocurrency rate advances under the Credit Agreement. + References No definition available. + Details
Name: | ipg_MarginForEurocurrencyRateAdvances
Namespace Prefix: | ipg_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: 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_LineOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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(b),22(b)) -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 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + 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(b),22(b)) -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 19, 22 -Article 5 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=ipg_CommittedCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LineOfCreditFacilityAxis=ipg_UncommittedCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |