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Debt and Credit Agreements Credit Agreements (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Line of Credit Facility [Line Items] |  |
Cash debt pooling arrangements, amount netted | $ 2,274.9 | $ 2,065.8
Margin for base rate advances | 0.125% |
Margin for Eurocurrency rate advances | 1.125% |
Annual rate for fronting fees accrued on letters of credit | 0.25% |
Annual facility fee | 0.125% |
Leverage ratio maximum | 3.75x |
Leverage Ratio Acquisition Price Threshold | $ 200.0 |
Committed credit facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 1,500.0 |
Line of credit facility, available capacity increase amount | 250.0 |
Limits on letters of credit | 50.0 |
Line of credit facility, amount outstanding | 0.0 |
Letters of credit, amount outstanding | 8.4 | 8.5
Line of credit facility, remaining borrowing capacity | 1,491.6 | 1,491.5
Uncommitted credit facility |  |
Line of Credit Facility [Line Items] |  |
Line of credit facility, amount outstanding | 52.4 | 73.7
Line of Credit Facility, Average Outstanding Amount | 88.0 | 96.4
Line of credit facility, current borrowing capacity | $ 1,056.0 | $ 1,173.1
Line of credit facility, weighted average interest rate, over time | 5.20% | 4.50%

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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
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Period Type: | duration

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

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- Definition Leverage Ratio Acquisition Price Threshold + References No definition available. + Details
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Balance Type: | debit
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
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- Definition The amount that the Company is able to increase the commitments under the credit facility agreement, subject to certain conditions. + References No definition available. + Details
Name: | ipg_LineofCreditFacilityAvailableCapacityIncreaseAmount
Namespace Prefix: | ipg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Limit of borrowings on letters of credit under the credit facility agreement. + 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 Margin for base rate advances under the Credit Agreement. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Margin for Eurocurrency rate advances under the Credit Agreement. + References No definition available. + Details
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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
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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&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 Average amount borrowed under the credit facility during the period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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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
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Weighted average interest rate of short-term debt outstanding calculated over time. + References No definition available. + Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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