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Share-based Compensation Awards (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Stock-settled awards |  |  |
Stock-based Payment Award |  |  |
Stock based awards expected to be settled in cash | 1.2ipg_Stockbasedawardsexpectedtobesettledincash / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember | 1.1ipg_Stockbasedawardsexpectedtobesettledincash / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember | 0.9ipg_Stockbasedawardsexpectedtobesettledincash / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember
Weighted-average grant-date fair value (per award) | $ 17.77us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember | $ 13.51us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember | $ 11.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember
Total fair value of vested awards distributed | $ 12.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember | $ 35.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember | $ 63.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember
Accrued dividends on non-vested stock-settled awards | 0.8us-gaap_DividendsSharebasedCompensationStock / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember | 0.7us-gaap_DividendsSharebasedCompensationStock / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember |
Dividends paid for stock-settled awards | 0.5ipg_DividendsPaidForStockSettledAwards / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember | 1.5ipg_DividendsPaidForStockSettledAwards / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember |
Cash-settled awards |  |  |
Stock-based Payment Award |  |  |
Stock based awards expected to be settled in cash | 0.1ipg_Stockbasedawardsexpectedtobesettledincash / us-gaap_AwardTypeAxis = ipg_CashSettledAwardsMember | 0.1ipg_Stockbasedawardsexpectedtobesettledincash / us-gaap_AwardTypeAxis = ipg_CashSettledAwardsMember | 0.1ipg_Stockbasedawardsexpectedtobesettledincash / us-gaap_AwardTypeAxis = ipg_CashSettledAwardsMember
Weighted-average grant-date fair value (per award) | $ 18.20us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ipg_CashSettledAwardsMember | $ 16.35us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ipg_CashSettledAwardsMember | $ 10.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ipg_CashSettledAwardsMember
Total fair value of vested awards distributed | 0.6us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = ipg_CashSettledAwardsMember | 5.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = ipg_CashSettledAwardsMember | 11.1us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = ipg_CashSettledAwardsMember
Performance-based awards |  |  |
Stock-based Payment Award |  |  |
Stock based awards expected to be settled in cash | 3.5ipg_Stockbasedawardsexpectedtobesettledincash / us-gaap_AwardTypeAxis = ipg_PerformanceBasedAwardsMember | 1.5ipg_Stockbasedawardsexpectedtobesettledincash / us-gaap_AwardTypeAxis = ipg_PerformanceBasedAwardsMember | 1.8ipg_Stockbasedawardsexpectedtobesettledincash / us-gaap_AwardTypeAxis = ipg_PerformanceBasedAwardsMember
Weighted-average grant-date fair value (per award) | $ 16.56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ipg_PerformanceBasedAwardsMember | $ 11.97us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ipg_PerformanceBasedAwardsMember | $ 10.61us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = ipg_PerformanceBasedAwardsMember
Total fair value of vested awards distributed | 15.3us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = ipg_PerformanceBasedAwardsMember | 0.2us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = ipg_PerformanceBasedAwardsMember | 11.5us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = ipg_PerformanceBasedAwardsMember
Performance based cash awards settled in shares |  |  |
Stock-based Payment Award |  |  |
Total fair value of vested awards distributed | $ 19.8us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = ipg_PerformanceBasedCashAwardsSettledInSharesMember | $ 17.4us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue / us-gaap_AwardTypeAxis = ipg_PerformanceBasedCashAwardsSettledInSharesMember |

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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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