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Debt and Credit Agreements Extinguishment of Debt (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Extinguishment of Debt [Line Items] |  |  |
Gains (Losses) on Extinguishment of Debt | $ 10.4us-gaap_GainsLossesOnExtinguishmentOfDebt | $ 45.2us-gaap_GainsLossesOnExtinguishmentOfDebt | $ 0us-gaap_GainsLossesOnExtinguishmentOfDebt
6.25% Notes |  |  |
Extinguishment of Debt [Line Items] |  |  |
Early Repayment of Senior Debt | 371.2us-gaap_EarlyRepaymentOfSeniorDebt / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt6.25NoteMember |  |
Debt Instrument, Face Amount | 350.0us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt6.25NoteMember |  |
Accrued Interest, Paid | 10.3us-gaap_InterestPaidNet / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt6.25NoteMember |  |
Gains (Losses) on Extinguishment of Debt | 10.4us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt6.25NoteMember |  |
10.00% Notes |  |  |
Extinguishment of Debt [Line Items] |  |  |
Write off of Debt Issuance Cost |  | 7.9us-gaap_WriteOffOfDeferredDebtIssuanceCost / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt10.0NoteMember |
Early Repayment of Senior Debt |  | 630.0us-gaap_EarlyRepaymentOfSeniorDebt / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt10.0NoteMember |
Debt Instrument, Face Amount |  | 600.0us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt10.0NoteMember |
Gains (Losses) on Extinguishment of Debt |  | 45.2us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt10.0NoteMember |
Redemption Premium |  | 30.0us-gaap_RedemptionPremium / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt10.0NoteMember |
Write off of Unamortized Discount |  | $ 7.3ipg_WriteoffofUnamortizedDiscount / us-gaap_LongtermDebtTypeAxis = ipg_UnsecuredDebt10.0NoteMember |

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- Definition Write off of Unamortized Discount + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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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 The cash outflow for the extinguishment of long-term borrowing, with the highest claim on the assets of the entity in case of bankruptcy or liquidation, before its maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Details
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- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12317-112629 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6850294&loc=d3e12355-112629 + Details
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- Definition The amount of cash paid for interest during the period net of cash paid for interest that is capitalized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586 + Details
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- Definition The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share. + References No definition available. + Details
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Period Type: | duration

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- Definition Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Details
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