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Restructuring and Other Reorganization-Related Charges (Reversals), net (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other reorganization-related charges (reversals), net | $ 0.1us-gaap_RestructuringCharges | $ (0.1)us-gaap_RestructuringCharges | $ 0.7us-gaap_RestructuringCharges | $ (0.5)us-gaap_RestructuringCharges | $ 60.6us-gaap_RestructuringCharges | $ (0.2)us-gaap_RestructuringCharges | $ 0.3us-gaap_RestructuringCharges | $ (0.1)us-gaap_RestructuringCharges | $ 0.2us-gaap_RestructuringCharges | $ 60.6us-gaap_RestructuringCharges | $ (1.2)us-gaap_RestructuringCharges
Severance and termination costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other reorganization-related charges (reversals), net |  |  |  |  |  |  |  |  | 0.1us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 55.9us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 0us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember
Payments for Restructuring |  |  |  |  |  |  |  |  | 41.8us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |
Restructuring Reserve, Translation Adjustment |  |  |  |  |  |  |  |  | (0.4)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |
Restructuring Reserve | 4.4us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |  |  | 46.5us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |  |  |  | 4.4us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember | 46.5us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |
Lease termination costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other reorganization-related charges (reversals), net |  |  |  |  |  |  |  |  | 0.1us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember | 4.2us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember | (1.1)us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember
Payments for Restructuring |  |  |  |  |  |  |  |  | 1.2us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember |  |
Restructuring Reserve, Translation Adjustment |  |  |  |  |  |  |  |  | (0.1)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember |  |
Restructuring Reserve | 2.6us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember |  |  |  | 3.9us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember |  |  |  | 2.6us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember | 3.9us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember |
Other exit costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other reorganization-related charges (reversals), net |  |  |  |  |  |  |  |  | 0us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | 0.5us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | (0.1)us-gaap_RestructuringCharges / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember
Payments for Restructuring |  |  |  |  |  |  |  |  | 0.5us-gaap_PaymentsForRestructuring / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |  |
Restructuring Reserve, Translation Adjustment |  |  |  |  |  |  |  |  | 0us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |  |
Restructuring Reserve | 0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |  |  |  | 0.5us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |  |  |  | 0us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember | 0.5us-gaap_RestructuringReserve / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |
IAN |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other reorganization-related charges (reversals), net |  |  |  |  |  |  |  |  |  | 0.3us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = us-gaap_OperatingSegmentsMember |
CMG |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other reorganization-related charges (reversals), net |  |  |  |  |  |  |  |  |  | (0.2)us-gaap_RestructuringCharges / us-gaap_StatementBusinessSegmentsAxis = ipg_ReportableSegmentsTwoMember |
2013 Restructuring Plan [Domain] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other reorganization-related charges (reversals), net |  |  |  |  |  |  |  |  | 0.1us-gaap_RestructuringCharges / us-gaap_PlanNameAxis = ipg_A2013RestructuringPlanDomain | 61.2us-gaap_RestructuringCharges / us-gaap_PlanNameAxis = ipg_A2013RestructuringPlanDomain |
Payments for Restructuring |  |  |  |  |  |  |  |  | 43.5us-gaap_PaymentsForRestructuring / us-gaap_PlanNameAxis = ipg_A2013RestructuringPlanDomain |  |
Restructuring Reserve, Translation Adjustment |  |  |  |  |  |  |  |  | (0.5)us-gaap_RestructuringReserveTranslationAdjustment / us-gaap_PlanNameAxis = ipg_A2013RestructuringPlanDomain |  |
Restructuring Reserve | 7.0us-gaap_RestructuringReserve / us-gaap_PlanNameAxis = ipg_A2013RestructuringPlanDomain |  |  |  | 50.9us-gaap_RestructuringReserve / us-gaap_PlanNameAxis = ipg_A2013RestructuringPlanDomain |  |  |  | 7.0us-gaap_RestructuringReserve / us-gaap_PlanNameAxis = ipg_A2013RestructuringPlanDomain | 50.9us-gaap_RestructuringReserve / us-gaap_PlanNameAxis = ipg_A2013RestructuringPlanDomain |
2013 Restructuring Plan [Domain] | Severance and termination costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other reorganization-related charges (reversals), net |  |  |  |  |  |  |  |  |  | 55.9us-gaap_RestructuringCharges / us-gaap_PlanNameAxis = ipg_A2013RestructuringPlanDomain / us-gaap_RestructuringCostAndReserveAxis = us-gaap_EmployeeSeveranceMember |
2013 Restructuring Plan [Domain] | Lease termination costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other reorganization-related charges (reversals), net |  |  |  |  |  |  |  |  | 0us-gaap_RestructuringCharges / us-gaap_PlanNameAxis = ipg_A2013RestructuringPlanDomain / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember | 4.8us-gaap_RestructuringCharges / us-gaap_PlanNameAxis = ipg_A2013RestructuringPlanDomain / us-gaap_RestructuringCostAndReserveAxis = us-gaap_ContractTerminationMember |
2013 Restructuring Plan [Domain] | Other exit costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other reorganization-related charges (reversals), net |  |  |  |  |  |  |  |  |  | 0.5us-gaap_RestructuringCharges / us-gaap_PlanNameAxis = ipg_A2013RestructuringPlanDomain / us-gaap_RestructuringCostAndReserveAxis = us-gaap_OtherRestructuringMember |
Prior Restructuring Plan [Domain] |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and other reorganization-related charges (reversals), net |  |  |  |  |  |  |  |  | 0.1us-gaap_RestructuringCharges / us-gaap_PlanNameAxis = ipg_PriorRestructuringPlanDomain | (0.6)us-gaap_RestructuringCharges / us-gaap_PlanNameAxis = ipg_PriorRestructuringPlanDomain | (1.2)us-gaap_RestructuringCharges / us-gaap_PlanNameAxis = ipg_PriorRestructuringPlanDomain
Restructuring Reserve | $ 1.1us-gaap_RestructuringReserve / us-gaap_PlanNameAxis = ipg_PriorRestructuringPlanDomain |  |  |  |  |  |  |  | $ 1.1us-gaap_RestructuringReserve / us-gaap_PlanNameAxis = ipg_PriorRestructuringPlanDomain |  |

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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + 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 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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- Definition Amount of foreign currency translation adjustment increasing or decreasing the accrual for a specified type of restructuring cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)(2)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 + Details
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