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Stock Based Compensation Expense (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | $ 56.7us-gaap_AllocatedShareBasedCompensationExpense |  | $ 46.0us-gaap_AllocatedShareBasedCompensationExpense |  | $ 50.4us-gaap_AllocatedShareBasedCompensationExpense |
Tax benefit | 20.6us-gaap_DeferredTaxExpenseFromStockOptionsExercised |  | 17.6us-gaap_DeferredTaxExpenseFromStockOptionsExercised |  | 19.7us-gaap_DeferredTaxExpenseFromStockOptionsExercised |
Employee Stock Option |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 2.1us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 3.7us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  | 5.4us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Stock-settled awards |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 10.0us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember |  | 9.8us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember |  | 14.9us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ipg_StockSettledAwardsMember |
Cash-settled awards |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 0.6us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ipg_CashSettledAwardsMember |  | 1.5us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ipg_CashSettledAwardsMember |  | 3.9us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ipg_CashSettledAwardsMember |
Performance-based awards |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 42.2us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ipg_PerformanceBasedAwardsMember |  | 29.6us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ipg_PerformanceBasedAwardsMember |  | 24.5us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ipg_PerformanceBasedAwardsMember |
Employee stock purchase plan |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | 0.6us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |  | 0.6us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |  | 0.6us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockMember |
Other |  |  |  |  |  |
Stock-based Payment Award |  |  |  |  |  |
Stock-based compensation expense | $ 1.2us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ipg_OtherCompensationMember | [1] | $ 0.8us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ipg_OtherCompensationMember | [1] | $ 1.1us-gaap_AllocatedShareBasedCompensationExpense / us-gaap_AwardTypeAxis = ipg_OtherCompensationMember | [1]
[1] | Represents charges recorded for severance expense related to stock-based compensation awards.

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Amount of deferred tax expense from write-off of the deferred tax asset related to deductible stock options at exercise. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=32706628&loc=d3e11283-113907 + Details
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