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Acquisitions Cash Paid for Acquisitions (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Business Acquisition [Line Items] |  |  |  |  |  |
Acquisition related payments | $ 13.6ipg_AcquisitionRelatedPayments |  | $ 27.6ipg_AcquisitionRelatedPayments |  | $ 37.1ipg_AcquisitionRelatedPayments |
Payments to Acquire Businesses, Net of Cash Acquired | 67.8us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  | 61.5us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  | 145.5us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |
Cash Acquired from Acquisition | (29.9)us-gaap_CashAcquiredFromAcquisition |  | (7.1)us-gaap_CashAcquiredFromAcquisition |  | (14.8)us-gaap_CashAcquiredFromAcquisition |
PaymentsToAcquireBusinessesGrossLessOperatingExpense s | 84.8ipg_PaymentsToAcquireBusinessesGrossLessOperatingExpenses |  | 91.1ipg_PaymentsToAcquireBusinessesGrossLessOperatingExpenses |  | 185.8ipg_PaymentsToAcquireBusinessesGrossLessOperatingExpenses |
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized | 3.4us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsExpensesAndLossesRecognized | [1] | 2.0us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsExpensesAndLossesRecognized | [1] | 3.2us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsExpensesAndLossesRecognized | [1]
Payments to Acquire Businesses, Gross | 81.4us-gaap_PaymentsToAcquireBusinessesGross | [2] | 89.1us-gaap_PaymentsToAcquireBusinessesGross | [2] | 182.6us-gaap_PaymentsToAcquireBusinessesGross | [2]
Current Year Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Businesses, Gross | 97.3us-gaap_PaymentsToAcquireBusinessesGross / ipg_AcquisitionsTypeAxis = ipg_CurrentYearAcquisitionMember |  | 67.7us-gaap_PaymentsToAcquireBusinessesGross / ipg_AcquisitionsTypeAxis = ipg_CurrentYearAcquisitionMember |  | 156.8us-gaap_PaymentsToAcquireBusinessesGross / ipg_AcquisitionsTypeAxis = ipg_CurrentYearAcquisitionMember |
Prior Year Acquisition [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 14.0us-gaap_PaymentsToAcquireBusinessesGross / ipg_AcquisitionsTypeAxis = ipg_PriorYearAcquisitionMember |  | $ 28.5us-gaap_PaymentsToAcquireBusinessesGross / ipg_AcquisitionsTypeAxis = ipg_PriorYearAcquisitionMember |  | $ 40.6us-gaap_PaymentsToAcquireBusinessesGross / ipg_AcquisitionsTypeAxis = ipg_PriorYearAcquisitionMember |
[1] | Of the total cash paid, $13.6, $27.6 and $37.1 for the years ended December 31, 2014, 2013 and 2012, respectively, are classified under the financing section of the Consolidated Statements of Cash Flows within acquisition-related payments. These amounts relate to increases in our ownership interests in our consolidated subsidiaries as well as deferred payments for acquisitions. Of the total cash paid, $67.8, $61.5 and $145.5 for the years ended December 31, 2014, 2013 and 2012, respectively, are classified under the investing section of the Consolidated Statements of Cash Flows within acquisitions, net of cash acquired. These amounts relate to initial payments for new transactions.
[2] | Represents cash payments made that were either in excess of the contractual value or contingent upon the future employment of the former owners of acquired companies

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- Definition The cash outflow associated with the purchase of noncontrolling interests and purchase price payments related to previous acquisitions + References No definition available. + Details
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- Definition Payments To Acquire Businesses Gross Less Operating Expenses + References No definition available. + Details
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- Definition The expenses and losses recorded for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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